12850 lines
271 KiB
C
12850 lines
271 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* ash shell port for busybox
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*
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* Copyright (c) 1989, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This version of ash is adapted from the source in Debian's ash 0.3.8-5
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* package.
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*
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* Modified by Erik Andersen <andersee@debian.org> and
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* Vladimir Oleynik <dzo@simtreas.ru> to be used in busybox
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*
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*
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* Original copyright notice is retained at the end of this file.
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*/
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/* These defines allow you to adjust the feature set to be compiled
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* into the ash shell. As a rule, enabling these options will make
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* ash get bigger... With all of these options off, ash adds about
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* 60k to busybox on an x86 system.*/
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/* Enable job control. This allows you to run jobs in the background,
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* which is great when ash is being used as an interactive shell, but
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* it completely useless for is all you are doing is running scripts.
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* This adds about 2.5k on an x86 system. */
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#undef JOBS
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/* This enables alias support in ash. If you want to support things
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* like "alias ls='ls -l'" with ash, enable this. This is only useful
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* when ash is used as an intractive shell. This adds about 1.5k */
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#define ASH_ALIAS
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/* If you need ash to act as a full Posix shell, with full math
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* support, enable this. This adds a bit over 2k an x86 system. */
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//#undef ASH_MATH_SUPPORT
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#define ASH_MATH_SUPPORT
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/* Getopts is used by shell procedures to parse positional parameters.
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* You probably want to leave this disabled, and use the busybox getopt
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* applet if you want to do this sort of thing. There are some scripts
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* out there that use it, so it you need it, enable. Most people will
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* leave this disabled. This adds 1k on an x86 system. */
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#undef ASH_GETOPTS
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/* This allows you to override shell builtins and use whatever is on
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* the filesystem. This is most useful when ash is acting as a
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* standalone shell. Adds about 272 bytes. */
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#undef ASH_CMDCMD
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/* Optimize size vs speed as size */
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#define ASH_OPTIMIZE_FOR_SIZE
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/* Enable this to compile in extra debugging noise. When debugging is
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* on, debugging info will be written to $HOME/trace and a quit signal
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* will generate a core dump. */
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#undef DEBUG
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/* These are here to work with glibc -- Don't change these... */
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#undef FNMATCH_BROKEN
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#undef GLOB_BROKEN
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#define IFS_BROKEN
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#include <assert.h>
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#include <stddef.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <paths.h>
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#include <pwd.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/cdefs.h>
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#include <sys/ioctl.h>
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#include <sys/param.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#if !defined(FNMATCH_BROKEN)
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#include <fnmatch.h>
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#endif
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#if !defined(GLOB_BROKEN)
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#include <glob.h>
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#endif
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#ifdef JOBS
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#include <termios.h>
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#endif
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#include "busybox.h"
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#include "cmdedit.h"
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/*
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* This file was generated by the mksyntax program.
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*/
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/* Syntax classes */
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#define CWORD 0 /* character is nothing special */
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#define CNL 1 /* newline character */
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#define CBACK 2 /* a backslash character */
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#define CSQUOTE 3 /* single quote */
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#define CDQUOTE 4 /* double quote */
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#define CENDQUOTE 5 /* a terminating quote */
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#define CBQUOTE 6 /* backwards single quote */
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#define CVAR 7 /* a dollar sign */
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#define CENDVAR 8 /* a '}' character */
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#define CLP 9 /* a left paren in arithmetic */
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#define CRP 10 /* a right paren in arithmetic */
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#define CENDFILE 11 /* end of file */
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#define CCTL 12 /* like CWORD, except it must be escaped */
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#define CSPCL 13 /* these terminate a word */
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#define CIGN 14 /* character should be ignored */
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#define SYNBASE 130
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#define PEOF -130
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#define PEOA -129
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#define TEOF 0
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#define TNL 1
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#define TREDIR 2
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#define TWORD 3
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#define TASSIGN 4
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#define TSEMI 5
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#define TBACKGND 6
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#define TAND 7
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#define TOR 8
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#define TPIPE 9
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#define TLP 10
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#define TRP 11
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#define TENDCASE 12
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#define TENDBQUOTE 13
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#define TNOT 14
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#define TCASE 15
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#define TDO 16
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#define TDONE 17
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#define TELIF 18
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#define TELSE 19
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#define TESAC 20
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#define TFI 21
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#define TFOR 22
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#define TIF 23
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#define TIN 24
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#define TTHEN 25
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#define TUNTIL 26
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#define TWHILE 27
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#define TBEGIN 28
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#define TEND 29
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/* control characters in argument strings */
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#define CTLESC '\201'
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#define CTLVAR '\202'
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#define CTLENDVAR '\203'
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#define CTLBACKQ '\204'
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#define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
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/* CTLBACKQ | CTLQUOTE == '\205' */
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#define CTLARI '\206'
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#define CTLENDARI '\207'
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#define CTLQUOTEMARK '\210'
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#define is_digit(c) ((c)>='0' && (c)<='9')
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#define is_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalpha((unsigned char) (c))))
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#define is_in_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalnum((unsigned char) (c))))
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/*
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* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
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* (assuming ascii char codes, as the original implementation did)
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*/
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#define is_special(c) \
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( (((unsigned int)c) - 33 < 32) \
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&& ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1))
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#define digit_val(c) ((c) - '0')
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#define _DIAGASSERT(x)
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#define S_DFL 1 /* default signal handling (SIG_DFL) */
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#define S_CATCH 2 /* signal is caught */
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#define S_IGN 3 /* signal is ignored (SIG_IGN) */
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#define S_HARD_IGN 4 /* signal is ignored permenantly */
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#define S_RESET 5 /* temporary - to reset a hard ignored sig */
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/* variable substitution byte (follows CTLVAR) */
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#define VSTYPE 0x0f /* type of variable substitution */
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#define VSNUL 0x10 /* colon--treat the empty string as unset */
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#define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
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/* values of VSTYPE field */
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#define VSNORMAL 0x1 /* normal variable: $var or ${var} */
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#define VSMINUS 0x2 /* ${var-text} */
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#define VSPLUS 0x3 /* ${var+text} */
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#define VSQUESTION 0x4 /* ${var?message} */
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#define VSASSIGN 0x5 /* ${var=text} */
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#define VSTRIMLEFT 0x6 /* ${var#pattern} */
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#define VSTRIMLEFTMAX 0x7 /* ${var##pattern} */
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#define VSTRIMRIGHT 0x8 /* ${var%pattern} */
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#define VSTRIMRIGHTMAX 0x9 /* ${var%%pattern} */
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#define VSLENGTH 0xa /* ${#var} */
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/* flags passed to redirect */
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#define REDIR_PUSH 01 /* save previous values of file descriptors */
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#define REDIR_BACKQ 02 /* save the command output to pipe */
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/*
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* BSD setjmp saves the signal mask, which violates ANSI C and takes time,
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* so we use _setjmp instead.
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*/
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#if defined(BSD)
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#define setjmp(jmploc) _setjmp(jmploc)
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#define longjmp(jmploc, val) _longjmp(jmploc, val)
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#endif
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/*
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* Most machines require the value returned from malloc to be aligned
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* in some way. The following macro will get this right on many machines.
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*/
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#ifndef ALIGN
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union align {
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int i;
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char *cp;
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};
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#define ALIGN(nbytes) (((nbytes) + sizeof(union align) - 1) & ~(sizeof(union align) - 1))
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#endif
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#ifdef BB_LOCALE_SUPPORT
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#include <locale.h>
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static void change_lc_all(const char *value);
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static void change_lc_ctype(const char *value);
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#endif
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/*
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* These macros allow the user to suspend the handling of interrupt signals
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* over a period of time. This is similar to SIGHOLD to or sigblock, but
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* much more efficient and portable. (But hacking the kernel is so much
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* more fun than worrying about efficiency and portability. :-))
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*/
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static void onint (void);
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static volatile int suppressint;
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static volatile int intpending;
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#define INTOFF suppressint++
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#ifndef ASH_OPTIMIZE_FOR_SIZE
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#define INTON { if (--suppressint == 0 && intpending) onint(); }
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#define FORCEINTON {suppressint = 0; if (intpending) onint();}
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#else
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static void __inton (void);
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static void forceinton (void);
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#define INTON __inton()
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#define FORCEINTON forceinton()
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#endif
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#define CLEAR_PENDING_INT intpending = 0
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#define int_pending() intpending
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typedef void *pointer;
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#ifndef NULL
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#define NULL (void *)0
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#endif
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static inline pointer ckmalloc (int sz) { return xmalloc(sz); }
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static inline pointer ckrealloc(void *p, int sz) { return xrealloc(p, sz); }
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static inline char * savestr (const char *s) { return xstrdup(s); }
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static pointer stalloc (int);
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static void stunalloc (pointer);
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static void ungrabstackstr (char *, char *);
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static char * growstackstr(void);
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static char * makestrspace(size_t newlen);
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static char *sstrdup (const char *);
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/*
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* Parse trees for commands are allocated in lifo order, so we use a stack
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* to make this more efficient, and also to avoid all sorts of exception
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* handling code to handle interrupts in the middle of a parse.
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*
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* The size 504 was chosen because the Ultrix malloc handles that size
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* well.
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*/
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#define MINSIZE 504 /* minimum size of a block */
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struct stack_block {
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struct stack_block *prev;
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char space[MINSIZE];
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};
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static struct stack_block stackbase;
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static struct stack_block *stackp = &stackbase;
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static struct stackmark *markp;
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static char *stacknxt = stackbase.space;
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static int stacknleft = MINSIZE;
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#define equal(s1, s2) (strcmp(s1, s2) == 0)
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#define stackblock() stacknxt
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#define stackblocksize() stacknleft
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#define STARTSTACKSTR(p) p = stackblock(), sstrnleft = stackblocksize()
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#define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
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#define CHECKSTRSPACE(n, p) { if (sstrnleft < n) p = makestrspace(n); }
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#define STACKSTRNUL(p) (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
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#define USTPUTC(c, p) (--sstrnleft, *p++ = (c))
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#define STUNPUTC(p) (++sstrnleft, --p)
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#define STTOPC(p) p[-1]
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#define STADJUST(amount, p) (p += (amount), sstrnleft -= (amount))
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#define grabstackstr(p) stalloc(stackblocksize() - sstrnleft)
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#define ckfree(p) free((pointer)(p))
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#ifdef DEBUG
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#define TRACE(param) trace param
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static void trace (const char *, ...);
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static void trargs (char **);
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static void showtree (union node *);
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static void trputc (int);
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static void trputs (const char *);
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static void opentrace (void);
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#else
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#define TRACE(param)
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#endif
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#define NSEMI 0
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#define NCMD 1
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#define NPIPE 2
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#define NREDIR 3
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#define NBACKGND 4
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#define NSUBSHELL 5
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#define NAND 6
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#define NOR 7
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#define NIF 8
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#define NWHILE 9
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#define NUNTIL 10
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#define NFOR 11
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#define NCASE 12
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#define NCLIST 13
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#define NDEFUN 14
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#define NARG 15
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#define NTO 16
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#define NFROM 17
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#define NFROMTO 18
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#define NAPPEND 19
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#define NTOOV 20
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#define NTOFD 21
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#define NFROMFD 22
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#define NHERE 23
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#define NXHERE 24
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#define NNOT 25
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/*
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* expandarg() flags
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*/
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#define EXP_FULL 0x1 /* perform word splitting & file globbing */
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#define EXP_TILDE 0x2 /* do normal tilde expansion */
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#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
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#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
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#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
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#define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
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#define NOPTS 16
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static char optet_vals[NOPTS];
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static const char * const optlist[NOPTS] = {
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"e" "errexit",
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"f" "noglob",
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"I" "ignoreeof",
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"i" "interactive",
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"m" "monitor",
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"n" "noexec",
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"s" "stdin",
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"x" "xtrace",
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"v" "verbose",
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"V" "vi",
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"E" "emacs",
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"C" "noclobber",
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"a" "allexport",
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"b" "notify",
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"u" "nounset",
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"q" "quietprofile"
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};
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#define optent_name(optent) (optent+1)
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#define optent_letter(optent) optent[0]
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#define optent_val(optent) optet_vals[optent]
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#define eflag optent_val(0)
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#define fflag optent_val(1)
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#define Iflag optent_val(2)
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#define iflag optent_val(3)
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#define mflag optent_val(4)
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#define nflag optent_val(5)
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#define sflag optent_val(6)
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#define xflag optent_val(7)
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#define vflag optent_val(8)
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#define Vflag optent_val(9)
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#define Eflag optent_val(10)
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#define Cflag optent_val(11)
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#define aflag optent_val(12)
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#define bflag optent_val(13)
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#define uflag optent_val(14)
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#define qflag optent_val(15)
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/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
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#define FORK_FG 0
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#define FORK_BG 1
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#define FORK_NOJOB 2
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struct nbinary {
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int type;
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union node *ch1;
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union node *ch2;
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};
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struct ncmd {
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int type;
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int backgnd;
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union node *assign;
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union node *args;
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union node *redirect;
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};
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struct npipe {
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int type;
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int backgnd;
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struct nodelist *cmdlist;
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};
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struct nredir {
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int type;
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union node *n;
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union node *redirect;
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};
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struct nif {
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int type;
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union node *test;
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union node *ifpart;
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union node *elsepart;
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};
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struct nfor {
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int type;
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union node *args;
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union node *body;
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char *var;
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};
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struct ncase {
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int type;
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union node *expr;
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union node *cases;
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};
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struct nclist {
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int type;
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union node *next;
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union node *pattern;
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union node *body;
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};
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struct narg {
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int type;
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union node *next;
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char *text;
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struct nodelist *backquote;
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};
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struct nfile {
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int type;
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union node *next;
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int fd;
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union node *fname;
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char *expfname;
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};
|
|
|
|
|
|
struct ndup {
|
|
int type;
|
|
union node *next;
|
|
int fd;
|
|
int dupfd;
|
|
union node *vname;
|
|
};
|
|
|
|
|
|
struct nhere {
|
|
int type;
|
|
union node *next;
|
|
int fd;
|
|
union node *doc;
|
|
};
|
|
|
|
|
|
struct nnot {
|
|
int type;
|
|
union node *com;
|
|
};
|
|
|
|
|
|
union node {
|
|
int type;
|
|
struct nbinary nbinary;
|
|
struct ncmd ncmd;
|
|
struct npipe npipe;
|
|
struct nredir nredir;
|
|
struct nif nif;
|
|
struct nfor nfor;
|
|
struct ncase ncase;
|
|
struct nclist nclist;
|
|
struct narg narg;
|
|
struct nfile nfile;
|
|
struct ndup ndup;
|
|
struct nhere nhere;
|
|
struct nnot nnot;
|
|
};
|
|
|
|
|
|
struct nodelist {
|
|
struct nodelist *next;
|
|
union node *n;
|
|
};
|
|
|
|
struct backcmd { /* result of evalbackcmd */
|
|
int fd; /* file descriptor to read from */
|
|
char *buf; /* buffer */
|
|
int nleft; /* number of chars in buffer */
|
|
struct job *jp; /* job structure for command */
|
|
};
|
|
|
|
struct cmdentry {
|
|
int cmdtype;
|
|
union param {
|
|
int index;
|
|
union node *func;
|
|
const struct builtincmd *cmd;
|
|
} u;
|
|
};
|
|
|
|
struct strlist {
|
|
struct strlist *next;
|
|
char *text;
|
|
};
|
|
|
|
|
|
struct arglist {
|
|
struct strlist *list;
|
|
struct strlist **lastp;
|
|
};
|
|
|
|
struct strpush {
|
|
struct strpush *prev; /* preceding string on stack */
|
|
char *prevstring;
|
|
int prevnleft;
|
|
#ifdef ASH_ALIAS
|
|
struct alias *ap; /* if push was associated with an alias */
|
|
#endif
|
|
char *string; /* remember the string since it may change */
|
|
};
|
|
|
|
struct parsefile {
|
|
struct parsefile *prev; /* preceding file on stack */
|
|
int linno; /* current line */
|
|
int fd; /* file descriptor (or -1 if string) */
|
|
int nleft; /* number of chars left in this line */
|
|
int lleft; /* number of chars left in this buffer */
|
|
char *nextc; /* next char in buffer */
|
|
char *buf; /* input buffer */
|
|
struct strpush *strpush; /* for pushing strings at this level */
|
|
struct strpush basestrpush; /* so pushing one is fast */
|
|
};
|
|
|
|
struct stackmark {
|
|
struct stack_block *stackp;
|
|
char *stacknxt;
|
|
int stacknleft;
|
|
struct stackmark *marknext;
|
|
};
|
|
|
|
struct shparam {
|
|
int nparam; /* # of positional parameters (without $0) */
|
|
unsigned char malloc; /* if parameter list dynamically allocated */
|
|
char **p; /* parameter list */
|
|
int optind; /* next parameter to be processed by getopts */
|
|
int optoff; /* used by getopts */
|
|
};
|
|
|
|
/*
|
|
* When commands are first encountered, they are entered in a hash table.
|
|
* This ensures that a full path search will not have to be done for them
|
|
* on each invocation.
|
|
*
|
|
* We should investigate converting to a linear search, even though that
|
|
* would make the command name "hash" a misnomer.
|
|
*/
|
|
#define CMDTABLESIZE 31 /* should be prime */
|
|
#define ARB 1 /* actual size determined at run time */
|
|
|
|
|
|
|
|
struct tblentry {
|
|
struct tblentry *next; /* next entry in hash chain */
|
|
union param param; /* definition of builtin function */
|
|
short cmdtype; /* index identifying command */
|
|
char rehash; /* if set, cd done since entry created */
|
|
char cmdname[ARB]; /* name of command */
|
|
};
|
|
|
|
|
|
static struct tblentry *cmdtable[CMDTABLESIZE];
|
|
static int builtinloc = -1; /* index in path of %builtin, or -1 */
|
|
static int exerrno = 0; /* Last exec error */
|
|
|
|
|
|
static void tryexec (char *, char **, char **);
|
|
static void printentry (struct tblentry *, int);
|
|
static void clearcmdentry (int);
|
|
static struct tblentry *cmdlookup (const char *, int);
|
|
static void delete_cmd_entry (void);
|
|
static int path_change (const char *, int *);
|
|
|
|
|
|
static void flushall (void);
|
|
static void out2fmt (const char *, ...)
|
|
__attribute__((__format__(__printf__,1,2)));
|
|
static int xwrite (int, const char *, int);
|
|
|
|
static inline void outstr (const char *p, FILE *file) { fputs(p, file); }
|
|
static void out1str(const char *p) { outstr(p, stdout); }
|
|
static void out2str(const char *p) { outstr(p, stderr); }
|
|
|
|
#ifndef ASH_OPTIMIZE_FOR_SIZE
|
|
#define out2c(c) putc((c), stderr)
|
|
#else
|
|
static void out2c(int c) { putc(c, stderr); }
|
|
#endif
|
|
|
|
|
|
#ifdef ASH_OPTIMIZE_FOR_SIZE
|
|
#define USE_SIT_FUNCTION
|
|
#endif
|
|
|
|
/* number syntax index */
|
|
#define BASESYNTAX 0 /* not in quotes */
|
|
#define DQSYNTAX 1 /* in double quotes */
|
|
#define SQSYNTAX 2 /* in single quotes */
|
|
#define ARISYNTAX 3 /* in arithmetic */
|
|
|
|
static const char S_I_T[][4] = {
|
|
/* 0 */ { CSPCL, CIGN, CIGN, CIGN }, /* PEOA */
|
|
/* 1 */ { CSPCL, CWORD, CWORD, CWORD }, /* ' ' */
|
|
/* 2 */ { CNL, CNL, CNL, CNL }, /* \n */
|
|
/* 3 */ { CWORD, CCTL, CCTL, CWORD }, /* !*-/:=?[]~ */
|
|
/* 4 */ { CDQUOTE, CENDQUOTE, CWORD, CDQUOTE }, /* '"' */
|
|
/* 5 */ { CVAR, CVAR, CWORD, CVAR }, /* $ */
|
|
/* 6 */ { CSQUOTE, CWORD, CENDQUOTE, CSQUOTE }, /* "'" */
|
|
/* 7 */ { CSPCL, CWORD, CWORD, CLP }, /* ( */
|
|
/* 8 */ { CSPCL, CWORD, CWORD, CRP }, /* ) */
|
|
/* 9 */ { CBACK, CBACK, CCTL, CBACK }, /* \ */
|
|
/* 10 */ { CBQUOTE, CBQUOTE, CWORD, CBQUOTE }, /* ` */
|
|
/* 11 */ { CENDVAR, CENDVAR, CWORD, CENDVAR }, /* } */
|
|
#ifndef USE_SIT_FUNCTION
|
|
/* 12 */ { CENDFILE, CENDFILE, CENDFILE, CENDFILE }, /* PEOF */
|
|
/* 13 */ { CWORD, CWORD, CWORD, CWORD }, /* 0-9A-Za-z */
|
|
/* 14 */ { CCTL, CCTL, CCTL, CCTL } /* CTLESC ... */
|
|
#endif
|
|
};
|
|
|
|
#ifdef USE_SIT_FUNCTION
|
|
|
|
#define U_C(c) ((unsigned char)(c))
|
|
|
|
static int SIT(int c, int syntax)
|
|
{
|
|
static const char spec_symbls[]="\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
|
|
static const char syntax_index_table [] = {
|
|
1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
|
|
7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
|
|
3, 1, 3, 3, 9, 3,10, 1, /* "=>?[\\]`|" */
|
|
11,3 }; /* "}~" */
|
|
const char *s;
|
|
int indx;
|
|
|
|
if(c==PEOF) /* 2^8+2 */
|
|
return CENDFILE;
|
|
if(c==PEOA) /* 2^8+1 */
|
|
indx = 0;
|
|
else if(U_C(c)>=U_C(CTLESC) && U_C(c)<=U_C(CTLQUOTEMARK))
|
|
return CCTL;
|
|
else {
|
|
s = strchr(spec_symbls, c);
|
|
if(s==0)
|
|
return CWORD;
|
|
indx = syntax_index_table[(s-spec_symbls)];
|
|
}
|
|
return S_I_T[indx][syntax];
|
|
}
|
|
|
|
#else /* USE_SIT_FUNCTION */
|
|
|
|
#define SIT(c, syntax) S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax]
|
|
|
|
#define CSPCL_CIGN_CIGN_CIGN 0
|
|
#define CSPCL_CWORD_CWORD_CWORD 1
|
|
#define CNL_CNL_CNL_CNL 2
|
|
#define CWORD_CCTL_CCTL_CWORD 3
|
|
#define CDQUOTE_CENDQUOTE_CWORD_CDQUOTE 4
|
|
#define CVAR_CVAR_CWORD_CVAR 5
|
|
#define CSQUOTE_CWORD_CENDQUOTE_CSQUOTE 6
|
|
#define CSPCL_CWORD_CWORD_CLP 7
|
|
#define CSPCL_CWORD_CWORD_CRP 8
|
|
#define CBACK_CBACK_CCTL_CBACK 9
|
|
#define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
|
|
#define CENDVAR_CENDVAR_CWORD_CENDVAR 11
|
|
#define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
|
|
#define CWORD_CWORD_CWORD_CWORD 13
|
|
#define CCTL_CCTL_CCTL_CCTL 14
|
|
|
|
static const char syntax_index_table[258] = {
|
|
/* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
|
|
/* 0 -130 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
|
|
/* 1 -129 PEOA */ CSPCL_CIGN_CIGN_CIGN,
|
|
/* 2 -128 0xff */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 3 -127 */ CCTL_CCTL_CCTL_CCTL, /* CTLQUOTEMARK */
|
|
/* 4 -126 */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 5 -125 */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 6 -124 */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 7 -123 */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 8 -122 */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 9 -121 */ CCTL_CCTL_CCTL_CCTL,
|
|
/* 10 -120 */ CCTL_CCTL_CCTL_CCTL, /* CTLESC */
|
|
/* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 130 0 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 131 1 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 132 2 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 133 3 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 134 4 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 135 5 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 136 6 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 137 7 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 138 8 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 140 10 "\n" */ CNL_CNL_CNL_CNL,
|
|
/* 141 11 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 142 12 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 143 13 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 144 14 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 145 15 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 146 16 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 147 17 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 148 18 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 149 19 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 150 20 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 151 21 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 152 22 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 153 23 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 154 24 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 155 25 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 156 26 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 157 27 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 158 28 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 159 29 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 160 30 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 161 31 */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CDQUOTE,
|
|
/* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
|
|
/* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CSQUOTE,
|
|
/* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
|
|
/* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
|
|
/* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
|
|
/* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
|
|
/* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
|
|
/* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
|
|
/* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
|
|
/* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
|
|
/* 257 127 */ CWORD_CWORD_CWORD_CWORD,
|
|
};
|
|
|
|
#endif /* USE_SIT_FUNCTION */
|
|
|
|
|
|
/* first char is indicating which tokens mark the end of a list */
|
|
static const char *const tokname_array[] = {
|
|
"\1end of file",
|
|
"\0newline",
|
|
"\0redirection",
|
|
"\0word",
|
|
"\0assignment",
|
|
"\0;",
|
|
"\0&",
|
|
"\0&&",
|
|
"\0||",
|
|
"\0|",
|
|
"\0(",
|
|
"\1)",
|
|
"\1;;",
|
|
"\1`",
|
|
#define KWDOFFSET 14
|
|
/* the following are keywords */
|
|
"\0!",
|
|
"\0case",
|
|
"\1do",
|
|
"\1done",
|
|
"\1elif",
|
|
"\1else",
|
|
"\1esac",
|
|
"\1fi",
|
|
"\0for",
|
|
"\0if",
|
|
"\0in",
|
|
"\1then",
|
|
"\0until",
|
|
"\0while",
|
|
"\0{",
|
|
"\1}",
|
|
};
|
|
|
|
static const char *tokname(int tok)
|
|
{
|
|
static char buf[16];
|
|
|
|
if(tok>=TSEMI)
|
|
buf[0] = '"';
|
|
sprintf(buf+(tok>=TSEMI), "%s%c",
|
|
tokname_array[tok]+1, (tok>=TSEMI ? '"' : 0));
|
|
return buf;
|
|
}
|
|
|
|
static int plinno = 1; /* input line number */
|
|
|
|
static int parselleft; /* copy of parsefile->lleft */
|
|
|
|
static struct parsefile basepf; /* top level input file */
|
|
static char basebuf[BUFSIZ]; /* buffer for top level input file */
|
|
static struct parsefile *parsefile = &basepf; /* current input file */
|
|
|
|
/*
|
|
* NEOF is returned by parsecmd when it encounters an end of file. It
|
|
* must be distinct from NULL, so we use the address of a variable that
|
|
* happens to be handy.
|
|
*/
|
|
|
|
static int tokpushback; /* last token pushed back */
|
|
#define NEOF ((union node *)&tokpushback)
|
|
static int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
|
|
|
|
|
|
static void error (const char *, ...) __attribute__((__noreturn__));
|
|
static void exerror (int, const char *, ...) __attribute__((__noreturn__));
|
|
static void shellexec (char **, char **, const char *, int)
|
|
__attribute__((noreturn));
|
|
static void exitshell (int) __attribute__((noreturn));
|
|
|
|
static int goodname(const char *);
|
|
static void ignoresig (int);
|
|
static void onsig (int);
|
|
static void dotrap (void);
|
|
static int decode_signal (const char *, int);
|
|
|
|
static void shprocvar(void);
|
|
static void deletefuncs(void);
|
|
static void setparam (char **);
|
|
static void freeparam (volatile struct shparam *);
|
|
|
|
/* reasons for skipping commands (see comment on breakcmd routine) */
|
|
#define SKIPBREAK 1
|
|
#define SKIPCONT 2
|
|
#define SKIPFUNC 3
|
|
#define SKIPFILE 4
|
|
|
|
/* values of cmdtype */
|
|
#define CMDUNKNOWN -1 /* no entry in table for command */
|
|
#define CMDNORMAL 0 /* command is an executable program */
|
|
#define CMDBUILTIN 1 /* command is a shell builtin */
|
|
#define CMDFUNCTION 2 /* command is a shell function */
|
|
|
|
#define DO_ERR 1 /* find_command prints errors */
|
|
#define DO_ABS 2 /* find_command checks absolute paths */
|
|
#define DO_NOFUN 4 /* find_command ignores functions */
|
|
#define DO_BRUTE 8 /* find_command ignores hash table */
|
|
|
|
/*
|
|
* Shell variables.
|
|
*/
|
|
|
|
/* flags */
|
|
#define VEXPORT 0x01 /* variable is exported */
|
|
#define VREADONLY 0x02 /* variable cannot be modified */
|
|
#define VSTRFIXED 0x04 /* variable struct is staticly allocated */
|
|
#define VTEXTFIXED 0x08 /* text is staticly allocated */
|
|
#define VSTACK 0x10 /* text is allocated on the stack */
|
|
#define VUNSET 0x20 /* the variable is not set */
|
|
#define VNOFUNC 0x40 /* don't call the callback function */
|
|
|
|
|
|
struct var {
|
|
struct var *next; /* next entry in hash list */
|
|
int flags; /* flags are defined above */
|
|
char *text; /* name=value */
|
|
void (*func) (const char *);
|
|
/* function to be called when */
|
|
/* the variable gets set/unset */
|
|
};
|
|
|
|
struct localvar {
|
|
struct localvar *next; /* next local variable in list */
|
|
struct var *vp; /* the variable that was made local */
|
|
int flags; /* saved flags */
|
|
char *text; /* saved text */
|
|
};
|
|
|
|
|
|
#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
|
|
#define rmescapes(p) _rmescapes((p), 0)
|
|
static char *_rmescapes (char *, int);
|
|
#else
|
|
static void rmescapes (char *);
|
|
#endif
|
|
|
|
static int casematch (union node *, const char *);
|
|
static void clearredir(void);
|
|
static void popstring(void);
|
|
static void readcmdfile (const char *);
|
|
|
|
static int number (const char *);
|
|
static int is_number (const char *, int *num);
|
|
static char *single_quote (const char *);
|
|
static int nextopt (const char *);
|
|
|
|
static void redirect (union node *, int);
|
|
static void popredir (void);
|
|
static int dup_as_newfd (int, int);
|
|
|
|
static void changepath(const char *newval);
|
|
static void getoptsreset(const char *value);
|
|
|
|
|
|
static int parsenleft; /* copy of parsefile->nleft */
|
|
static char *parsenextc; /* copy of parsefile->nextc */
|
|
static int rootpid; /* pid of main shell */
|
|
static int rootshell; /* true if we aren't a child of the main shell */
|
|
|
|
static const char spcstr[] = " ";
|
|
static const char snlfmt[] = "%s\n";
|
|
|
|
static int sstrnleft;
|
|
static int herefd = -1;
|
|
|
|
static struct localvar *localvars;
|
|
|
|
static struct var vifs;
|
|
static struct var vmail;
|
|
static struct var vmpath;
|
|
static struct var vpath;
|
|
static struct var vps1;
|
|
static struct var vps2;
|
|
static struct var voptind;
|
|
#ifdef BB_LOCALE_SUPPORT
|
|
static struct var vlc_all;
|
|
static struct var vlc_ctype;
|
|
#endif
|
|
|
|
struct varinit {
|
|
struct var *var;
|
|
int flags;
|
|
const char *text;
|
|
void (*func) (const char *);
|
|
};
|
|
|
|
static const char defpathvar[] =
|
|
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
|
|
#define defpath (defpathvar + 5)
|
|
|
|
#ifdef IFS_BROKEN
|
|
static const char defifsvar[] = "IFS= \t\n";
|
|
#define defifs (defifsvar + 4)
|
|
#else
|
|
static const char defifs[] = " \t\n";
|
|
#endif
|
|
|
|
static const struct varinit varinit[] = {
|
|
#ifdef IFS_BROKEN
|
|
{ &vifs, VSTRFIXED|VTEXTFIXED, defifsvar,
|
|
#else
|
|
{ &vifs, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS=",
|
|
#endif
|
|
NULL },
|
|
{ &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
|
|
NULL },
|
|
{ &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
|
|
NULL },
|
|
{ &vpath, VSTRFIXED|VTEXTFIXED, defpathvar,
|
|
changepath },
|
|
/*
|
|
* vps1 depends on uid
|
|
*/
|
|
{ &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
|
|
NULL },
|
|
{ &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1",
|
|
getoptsreset },
|
|
#ifdef BB_LOCALE_SUPPORT
|
|
{ &vlc_all, VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL=",
|
|
change_lc_all },
|
|
{ &vlc_ctype, VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE=",
|
|
change_lc_ctype },
|
|
#endif
|
|
{ NULL, 0, NULL,
|
|
NULL }
|
|
};
|
|
|
|
#define VTABSIZE 39
|
|
|
|
static struct var *vartab[VTABSIZE];
|
|
|
|
/*
|
|
* The following macros access the values of the above variables.
|
|
* They have to skip over the name. They return the null string
|
|
* for unset variables.
|
|
*/
|
|
|
|
#define ifsval() (vifs.text + 4)
|
|
#define ifsset() ((vifs.flags & VUNSET) == 0)
|
|
#define mailval() (vmail.text + 5)
|
|
#define mpathval() (vmpath.text + 9)
|
|
#define pathval() (vpath.text + 5)
|
|
#define ps1val() (vps1.text + 4)
|
|
#define ps2val() (vps2.text + 4)
|
|
#define optindval() (voptind.text + 7)
|
|
|
|
#define mpathset() ((vmpath.flags & VUNSET) == 0)
|
|
|
|
static void initvar (void);
|
|
static void setvar (const char *, const char *, int);
|
|
static void setvareq (char *, int);
|
|
static void listsetvar (struct strlist *);
|
|
static const char *lookupvar (const char *);
|
|
static const char *bltinlookup (const char *);
|
|
static char **environment (void);
|
|
static int showvarscmd (int, char **);
|
|
static void mklocal (char *);
|
|
static void poplocalvars (void);
|
|
static int unsetvar (const char *);
|
|
static int varequal (const char *, const char *);
|
|
|
|
|
|
static char *arg0; /* value of $0 */
|
|
static struct shparam shellparam; /* current positional parameters */
|
|
static char **argptr; /* argument list for builtin commands */
|
|
static char *optionarg; /* set by nextopt (like getopt) */
|
|
static char *optptr; /* used by nextopt */
|
|
static char *minusc; /* argument to -c option */
|
|
|
|
|
|
#ifdef ASH_ALIAS
|
|
|
|
#define ALIASINUSE 1
|
|
#define ALIASDEAD 2
|
|
|
|
#define ATABSIZE 39
|
|
|
|
struct alias {
|
|
struct alias *next;
|
|
char *name;
|
|
char *val;
|
|
int flag;
|
|
};
|
|
|
|
static struct alias *atab[ATABSIZE];
|
|
|
|
static void setalias (char *, char *);
|
|
static struct alias **hashalias (const char *);
|
|
static struct alias *freealias (struct alias *);
|
|
static struct alias **__lookupalias (const char *);
|
|
|
|
static void
|
|
setalias(name, val)
|
|
char *name, *val;
|
|
{
|
|
struct alias *ap, **app;
|
|
|
|
app = __lookupalias(name);
|
|
ap = *app;
|
|
INTOFF;
|
|
if (ap) {
|
|
if (!(ap->flag & ALIASINUSE)) {
|
|
ckfree(ap->val);
|
|
}
|
|
ap->val = savestr(val);
|
|
ap->flag &= ~ALIASDEAD;
|
|
} else {
|
|
/* not found */
|
|
ap = ckmalloc(sizeof (struct alias));
|
|
ap->name = savestr(name);
|
|
ap->val = savestr(val);
|
|
ap->flag = 0;
|
|
ap->next = 0;
|
|
*app = ap;
|
|
}
|
|
INTON;
|
|
}
|
|
|
|
static int
|
|
unalias(char *name)
|
|
{
|
|
struct alias **app;
|
|
|
|
app = __lookupalias(name);
|
|
|
|
if (*app) {
|
|
INTOFF;
|
|
*app = freealias(*app);
|
|
INTON;
|
|
return (0);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
static void
|
|
rmaliases(void)
|
|
{
|
|
struct alias *ap, **app;
|
|
int i;
|
|
|
|
INTOFF;
|
|
for (i = 0; i < ATABSIZE; i++) {
|
|
app = &atab[i];
|
|
for (ap = *app; ap; ap = *app) {
|
|
*app = freealias(*app);
|
|
if (ap == *app) {
|
|
app = &ap->next;
|
|
}
|
|
}
|
|
}
|
|
INTON;
|
|
}
|
|
|
|
static struct alias *
|
|
lookupalias(const char *name, int check)
|
|
{
|
|
struct alias *ap = *__lookupalias(name);
|
|
|
|
if (check && ap && (ap->flag & ALIASINUSE))
|
|
return (NULL);
|
|
return (ap);
|
|
}
|
|
|
|
static void
|
|
printalias(const struct alias *ap) {
|
|
char *p;
|
|
|
|
p = single_quote(ap->val);
|
|
printf("alias %s=%s\n", ap->name, p);
|
|
stunalloc(p);
|
|
}
|
|
|
|
|
|
/*
|
|
* TODO - sort output
|
|
*/
|
|
static int
|
|
aliascmd(int argc, char **argv)
|
|
{
|
|
char *n, *v;
|
|
int ret = 0;
|
|
struct alias *ap;
|
|
|
|
if (argc == 1) {
|
|
int i;
|
|
|
|
for (i = 0; i < ATABSIZE; i++)
|
|
for (ap = atab[i]; ap; ap = ap->next) {
|
|
printalias(ap);
|
|
}
|
|
return (0);
|
|
}
|
|
while ((n = *++argv) != NULL) {
|
|
if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */
|
|
if ((ap = *__lookupalias(n)) == NULL) {
|
|
out2fmt("%s: %s not found\n", "alias", n);
|
|
ret = 1;
|
|
} else
|
|
printalias(ap);
|
|
}
|
|
else {
|
|
*v++ = '\0';
|
|
setalias(n, v);
|
|
}
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
static int
|
|
unaliascmd(int argc, char **argv)
|
|
{
|
|
int i;
|
|
|
|
while ((i = nextopt("a")) != '\0') {
|
|
if (i == 'a') {
|
|
rmaliases();
|
|
return (0);
|
|
}
|
|
}
|
|
for (i = 0; *argptr; argptr++) {
|
|
if (unalias(*argptr)) {
|
|
out2fmt("%s: %s not found\n", "unalias", *argptr);
|
|
i = 1;
|
|
}
|
|
}
|
|
|
|
return (i);
|
|
}
|
|
|
|
static struct alias **
|
|
hashalias(p)
|
|
const char *p;
|
|
{
|
|
unsigned int hashval;
|
|
|
|
hashval = *p << 4;
|
|
while (*p)
|
|
hashval+= *p++;
|
|
return &atab[hashval % ATABSIZE];
|
|
}
|
|
|
|
static struct alias *
|
|
freealias(struct alias *ap) {
|
|
struct alias *next;
|
|
|
|
if (ap->flag & ALIASINUSE) {
|
|
ap->flag |= ALIASDEAD;
|
|
return ap;
|
|
}
|
|
|
|
next = ap->next;
|
|
ckfree(ap->name);
|
|
ckfree(ap->val);
|
|
ckfree(ap);
|
|
return next;
|
|
}
|
|
|
|
|
|
static struct alias **
|
|
__lookupalias(const char *name) {
|
|
struct alias **app = hashalias(name);
|
|
|
|
for (; *app; app = &(*app)->next) {
|
|
if (equal(name, (*app)->name)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return app;
|
|
}
|
|
#endif
|
|
|
|
#ifdef ASH_MATH_SUPPORT
|
|
/* The generated file arith.c has been replaced with a custom hand
|
|
* written implementation written by Aaron Lehmann <aaronl@vitelus.com>.
|
|
* This is now part of libbb, so that it can be used by all the shells
|
|
* in busybox. */
|
|
#define ARITH_NUM 257
|
|
#define ARITH_LPAREN 258
|
|
#define ARITH_RPAREN 259
|
|
#define ARITH_OR 260
|
|
#define ARITH_AND 261
|
|
#define ARITH_BOR 262
|
|
#define ARITH_BXOR 263
|
|
#define ARITH_BAND 264
|
|
#define ARITH_EQ 265
|
|
#define ARITH_NE 266
|
|
#define ARITH_LT 267
|
|
#define ARITH_GT 268
|
|
#define ARITH_GE 269
|
|
#define ARITH_LE 270
|
|
#define ARITH_LSHIFT 271
|
|
#define ARITH_RSHIFT 272
|
|
#define ARITH_ADD 273
|
|
#define ARITH_SUB 274
|
|
#define ARITH_MUL 275
|
|
#define ARITH_DIV 276
|
|
#define ARITH_REM 277
|
|
#define ARITH_UNARYMINUS 278
|
|
#define ARITH_UNARYPLUS 279
|
|
#define ARITH_NOT 280
|
|
#define ARITH_BNOT 281
|
|
|
|
static void expari (int);
|
|
#endif
|
|
|
|
static char *trap[NSIG]; /* trap handler commands */
|
|
static char sigmode[NSIG - 1]; /* current value of signal */
|
|
static char gotsig[NSIG - 1]; /* indicates specified signal received */
|
|
static int pendingsigs; /* indicates some signal received */
|
|
|
|
/*
|
|
* This file was generated by the mkbuiltins program.
|
|
*/
|
|
|
|
#ifdef JOBS
|
|
static int bgcmd (int, char **);
|
|
static int fgcmd (int, char **);
|
|
static int killcmd (int, char **);
|
|
#endif
|
|
static int bltincmd (int, char **);
|
|
static int cdcmd (int, char **);
|
|
static int breakcmd (int, char **);
|
|
#ifdef ASH_CMDCMD
|
|
static int commandcmd (int, char **);
|
|
#endif
|
|
static int dotcmd (int, char **);
|
|
static int evalcmd (int, char **);
|
|
static int execcmd (int, char **);
|
|
static int exitcmd (int, char **);
|
|
static int exportcmd (int, char **);
|
|
static int histcmd (int, char **);
|
|
static int hashcmd (int, char **);
|
|
static int helpcmd (int, char **);
|
|
static int jobscmd (int, char **);
|
|
static int localcmd (int, char **);
|
|
#ifndef BB_PWD
|
|
static int pwdcmd (int, char **);
|
|
#endif
|
|
static int readcmd (int, char **);
|
|
static int returncmd (int, char **);
|
|
static int setcmd (int, char **);
|
|
static int setvarcmd (int, char **);
|
|
static int shiftcmd (int, char **);
|
|
static int trapcmd (int, char **);
|
|
static int umaskcmd (int, char **);
|
|
#ifdef ASH_ALIAS
|
|
static int aliascmd (int, char **);
|
|
static int unaliascmd (int, char **);
|
|
#endif
|
|
static int unsetcmd (int, char **);
|
|
static int waitcmd (int, char **);
|
|
static int ulimitcmd (int, char **);
|
|
static int timescmd (int, char **);
|
|
#ifdef ASH_MATH_SUPPORT
|
|
static int letcmd (int, char **);
|
|
#endif
|
|
static int typecmd (int, char **);
|
|
#ifdef ASH_GETOPTS
|
|
static int getoptscmd (int, char **);
|
|
#endif
|
|
|
|
#ifndef BB_TRUE_FALSE
|
|
static int true_main (int, char **);
|
|
static int false_main (int, char **);
|
|
#endif
|
|
|
|
static void setpwd (const char *, int);
|
|
|
|
|
|
#define BUILTIN_NOSPEC "0"
|
|
#define BUILTIN_SPECIAL "1"
|
|
#define BUILTIN_REGULAR "2"
|
|
#define BUILTIN_ASSIGN "4"
|
|
#define BUILTIN_SPEC_ASSG "5"
|
|
#define BUILTIN_REG_ASSG "6"
|
|
|
|
#define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1)
|
|
#define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2)
|
|
#define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4)
|
|
|
|
struct builtincmd {
|
|
const char *name;
|
|
int (*const builtinfunc) (int, char **);
|
|
//unsigned flags;
|
|
};
|
|
|
|
|
|
/* It is CRUCIAL that this listing be kept in ascii order, otherwise
|
|
* the binary search in find_builtin() will stop working. If you value
|
|
* your kneecaps, you'll be sure to *make sure* that any changes made
|
|
* to this array result in the listing remaining in ascii order. You
|
|
* have been warned.
|
|
*/
|
|
static const struct builtincmd builtincmds[] = {
|
|
{ BUILTIN_SPECIAL ".", dotcmd }, /* first, see declare DOTCMD */
|
|
{ BUILTIN_SPECIAL ":", true_main },
|
|
#ifdef ASH_ALIAS
|
|
{ BUILTIN_REG_ASSG "alias", aliascmd },
|
|
#endif
|
|
#ifdef JOBS
|
|
{ BUILTIN_REGULAR "bg", bgcmd },
|
|
#endif
|
|
{ BUILTIN_SPECIAL "break", breakcmd },
|
|
{ BUILTIN_SPECIAL "builtin", bltincmd },
|
|
{ BUILTIN_REGULAR "cd", cdcmd },
|
|
{ BUILTIN_NOSPEC "chdir", cdcmd },
|
|
#ifdef ASH_CMDCMD
|
|
{ BUILTIN_REGULAR "command", commandcmd },
|
|
#endif
|
|
{ BUILTIN_SPECIAL "continue", breakcmd },
|
|
{ BUILTIN_SPECIAL "eval", evalcmd },
|
|
{ BUILTIN_SPECIAL "exec", execcmd },
|
|
{ BUILTIN_SPECIAL "exit", exitcmd },
|
|
{ BUILTIN_SPEC_ASSG "export", exportcmd },
|
|
{ BUILTIN_REGULAR "false", false_main },
|
|
{ BUILTIN_REGULAR "fc", histcmd },
|
|
#ifdef JOBS
|
|
{ BUILTIN_REGULAR "fg", fgcmd },
|
|
#endif
|
|
#ifdef ASH_GETOPTS
|
|
{ BUILTIN_REGULAR "getopts", getoptscmd },
|
|
#endif
|
|
{ BUILTIN_NOSPEC "hash", hashcmd },
|
|
{ BUILTIN_NOSPEC "help", helpcmd },
|
|
{ BUILTIN_REGULAR "jobs", jobscmd },
|
|
#ifdef JOBS
|
|
{ BUILTIN_REGULAR "kill", killcmd },
|
|
#endif
|
|
#ifdef ASH_MATH_SUPPORT
|
|
{ BUILTIN_REGULAR "let", letcmd },
|
|
#endif
|
|
{ BUILTIN_ASSIGN "local", localcmd },
|
|
#ifndef BB_PWD
|
|
{ BUILTIN_NOSPEC "pwd", pwdcmd },
|
|
#endif
|
|
{ BUILTIN_REGULAR "read", readcmd },
|
|
{ BUILTIN_SPEC_ASSG "readonly", exportcmd },
|
|
{ BUILTIN_SPECIAL "return", returncmd },
|
|
{ BUILTIN_SPECIAL "set", setcmd },
|
|
{ BUILTIN_NOSPEC "setvar", setvarcmd },
|
|
{ BUILTIN_SPECIAL "shift", shiftcmd },
|
|
{ BUILTIN_SPECIAL "times", timescmd },
|
|
{ BUILTIN_SPECIAL "trap", trapcmd },
|
|
{ BUILTIN_REGULAR "true", true_main },
|
|
{ BUILTIN_NOSPEC "type", typecmd },
|
|
{ BUILTIN_NOSPEC "ulimit", ulimitcmd },
|
|
{ BUILTIN_REGULAR "umask", umaskcmd },
|
|
#ifdef ASH_ALIAS
|
|
{ BUILTIN_REGULAR "unalias", unaliascmd },
|
|
#endif
|
|
{ BUILTIN_SPECIAL "unset", unsetcmd },
|
|
{ BUILTIN_REGULAR "wait", waitcmd },
|
|
};
|
|
#define NUMBUILTINS (sizeof (builtincmds) / sizeof (struct builtincmd) )
|
|
|
|
#define DOTCMD &builtincmds[0]
|
|
static struct builtincmd *BLTINCMD;
|
|
static struct builtincmd *EXECCMD;
|
|
static struct builtincmd *EVALCMD;
|
|
|
|
/* states */
|
|
#define JOBSTOPPED 1 /* all procs are stopped */
|
|
#define JOBDONE 2 /* all procs are completed */
|
|
|
|
/*
|
|
* A job structure contains information about a job. A job is either a
|
|
* single process or a set of processes contained in a pipeline. In the
|
|
* latter case, pidlist will be non-NULL, and will point to a -1 terminated
|
|
* array of pids.
|
|
*/
|
|
|
|
struct procstat {
|
|
pid_t pid; /* process id */
|
|
int status; /* status flags (defined above) */
|
|
char *cmd; /* text of command being run */
|
|
};
|
|
|
|
|
|
static int job_warning; /* user was warned about stopped jobs */
|
|
|
|
#ifdef JOBS
|
|
static void setjobctl(int enable);
|
|
#else
|
|
#define setjobctl(on) /* do nothing */
|
|
#endif
|
|
|
|
|
|
struct job {
|
|
struct procstat ps0; /* status of process */
|
|
struct procstat *ps; /* status or processes when more than one */
|
|
short nprocs; /* number of processes */
|
|
short pgrp; /* process group of this job */
|
|
char state; /* true if job is finished */
|
|
char used; /* true if this entry is in used */
|
|
char changed; /* true if status has changed */
|
|
#ifdef JOBS
|
|
char jobctl; /* job running under job control */
|
|
#endif
|
|
};
|
|
|
|
static struct job *jobtab; /* array of jobs */
|
|
static int njobs; /* size of array */
|
|
static int backgndpid = -1; /* pid of last background process */
|
|
#ifdef JOBS
|
|
static int initialpgrp; /* pgrp of shell on invocation */
|
|
static int curjob; /* current job */
|
|
static int jobctl;
|
|
#endif
|
|
static int intreceived;
|
|
|
|
static struct job *makejob (const union node *, int);
|
|
static int forkshell (struct job *, const union node *, int);
|
|
static int waitforjob (struct job *);
|
|
|
|
static int docd (char *, int);
|
|
static char *getcomponent (void);
|
|
static void updatepwd (const char *);
|
|
static void getpwd (void);
|
|
|
|
static char *padvance (const char **, const char *);
|
|
|
|
static char nullstr[1]; /* zero length string */
|
|
static char *curdir = nullstr; /* current working directory */
|
|
static char *cdcomppath;
|
|
|
|
static int
|
|
cdcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
const char *dest;
|
|
const char *path;
|
|
char *p;
|
|
struct stat statb;
|
|
int print = 0;
|
|
|
|
nextopt(nullstr);
|
|
if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME")) == NULL)
|
|
error("HOME not set");
|
|
if (*dest == '\0')
|
|
dest = ".";
|
|
if (dest[0] == '-' && dest[1] == '\0') {
|
|
dest = bltinlookup("OLDPWD");
|
|
if (!dest || !*dest) {
|
|
dest = curdir;
|
|
}
|
|
print = 1;
|
|
if (dest)
|
|
print = 1;
|
|
else
|
|
dest = ".";
|
|
}
|
|
if (*dest == '/' || (path = bltinlookup("CDPATH")) == NULL)
|
|
path = nullstr;
|
|
while ((p = padvance(&path, dest)) != NULL) {
|
|
if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
|
|
if (!print) {
|
|
/*
|
|
* XXX - rethink
|
|
*/
|
|
if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
|
|
p += 2;
|
|
print = strcmp(p, dest);
|
|
}
|
|
if (docd(p, print) >= 0)
|
|
return 0;
|
|
|
|
}
|
|
}
|
|
error("can't cd to %s", dest);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
/*
|
|
* Actually do the chdir. In an interactive shell, print the
|
|
* directory name if "print" is nonzero.
|
|
*/
|
|
|
|
static int
|
|
docd(dest, print)
|
|
char *dest;
|
|
int print;
|
|
{
|
|
char *p;
|
|
char *q;
|
|
char *component;
|
|
struct stat statb;
|
|
int first;
|
|
int badstat;
|
|
|
|
TRACE(("docd(\"%s\", %d) called\n", dest, print));
|
|
|
|
/*
|
|
* Check each component of the path. If we find a symlink or
|
|
* something we can't stat, clear curdir to force a getcwd()
|
|
* next time we get the value of the current directory.
|
|
*/
|
|
badstat = 0;
|
|
cdcomppath = sstrdup(dest);
|
|
STARTSTACKSTR(p);
|
|
if (*dest == '/') {
|
|
STPUTC('/', p);
|
|
cdcomppath++;
|
|
}
|
|
first = 1;
|
|
while ((q = getcomponent()) != NULL) {
|
|
if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
|
|
continue;
|
|
if (! first)
|
|
STPUTC('/', p);
|
|
first = 0;
|
|
component = q;
|
|
while (*q)
|
|
STPUTC(*q++, p);
|
|
if (equal(component, ".."))
|
|
continue;
|
|
STACKSTRNUL(p);
|
|
if ((lstat(stackblock(), &statb) < 0)
|
|
|| (S_ISLNK(statb.st_mode))) {
|
|
/* print = 1; */
|
|
badstat = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
INTOFF;
|
|
if (chdir(dest) < 0) {
|
|
INTON;
|
|
return -1;
|
|
}
|
|
updatepwd(badstat ? NULL : dest);
|
|
INTON;
|
|
if (print && iflag)
|
|
printf(snlfmt, curdir);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Get the next component of the path name pointed to by cdcomppath.
|
|
* This routine overwrites the string pointed to by cdcomppath.
|
|
*/
|
|
|
|
static char *
|
|
getcomponent() {
|
|
char *p;
|
|
char *start;
|
|
|
|
if ((p = cdcomppath) == NULL)
|
|
return NULL;
|
|
start = cdcomppath;
|
|
while (*p != '/' && *p != '\0')
|
|
p++;
|
|
if (*p == '\0') {
|
|
cdcomppath = NULL;
|
|
} else {
|
|
*p++ = '\0';
|
|
cdcomppath = p;
|
|
}
|
|
return start;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Update curdir (the name of the current directory) in response to a
|
|
* cd command. We also call hashcd to let the routines in exec.c know
|
|
* that the current directory has changed.
|
|
*/
|
|
|
|
static void hashcd (void);
|
|
|
|
static void
|
|
updatepwd(const char *dir)
|
|
{
|
|
char *new;
|
|
char *p;
|
|
size_t len;
|
|
|
|
hashcd(); /* update command hash table */
|
|
|
|
/*
|
|
* If our argument is NULL, we don't know the current directory
|
|
* any more because we traversed a symbolic link or something
|
|
* we couldn't stat().
|
|
*/
|
|
if (dir == NULL || curdir == nullstr) {
|
|
setpwd(0, 1);
|
|
return;
|
|
}
|
|
len = strlen(dir);
|
|
cdcomppath = sstrdup(dir);
|
|
STARTSTACKSTR(new);
|
|
if (*dir != '/') {
|
|
p = curdir;
|
|
while (*p)
|
|
STPUTC(*p++, new);
|
|
if (p[-1] == '/')
|
|
STUNPUTC(new);
|
|
}
|
|
while ((p = getcomponent()) != NULL) {
|
|
if (equal(p, "..")) {
|
|
while (new > stackblock() && (STUNPUTC(new), *new) != '/');
|
|
} else if (*p != '\0' && ! equal(p, ".")) {
|
|
STPUTC('/', new);
|
|
while (*p)
|
|
STPUTC(*p++, new);
|
|
}
|
|
}
|
|
if (new == stackblock())
|
|
STPUTC('/', new);
|
|
STACKSTRNUL(new);
|
|
setpwd(stackblock(), 1);
|
|
}
|
|
|
|
|
|
#ifndef BB_PWD
|
|
static int
|
|
pwdcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
printf(snlfmt, curdir);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Find out what the current directory is. If we already know the current
|
|
* directory, this routine returns immediately.
|
|
*/
|
|
static void
|
|
getpwd(void)
|
|
{
|
|
curdir = xgetcwd(0);
|
|
if(curdir==0)
|
|
curdir = nullstr;
|
|
}
|
|
|
|
static void
|
|
setpwd(const char *val, int setold)
|
|
{
|
|
if (setold) {
|
|
setvar("OLDPWD", curdir, VEXPORT);
|
|
}
|
|
INTOFF;
|
|
if (curdir != nullstr) {
|
|
free(curdir);
|
|
curdir = nullstr;
|
|
}
|
|
if (!val) {
|
|
getpwd();
|
|
} else {
|
|
curdir = savestr(val);
|
|
}
|
|
INTON;
|
|
setvar("PWD", curdir, VEXPORT);
|
|
}
|
|
|
|
/*
|
|
* Errors and exceptions.
|
|
*/
|
|
|
|
/*
|
|
* Code to handle exceptions in C.
|
|
*/
|
|
|
|
/*
|
|
* We enclose jmp_buf in a structure so that we can declare pointers to
|
|
* jump locations. The global variable handler contains the location to
|
|
* jump to when an exception occurs, and the global variable exception
|
|
* contains a code identifying the exeception. To implement nested
|
|
* exception handlers, the user should save the value of handler on entry
|
|
* to an inner scope, set handler to point to a jmploc structure for the
|
|
* inner scope, and restore handler on exit from the scope.
|
|
*/
|
|
|
|
struct jmploc {
|
|
jmp_buf loc;
|
|
};
|
|
|
|
/* exceptions */
|
|
#define EXINT 0 /* SIGINT received */
|
|
#define EXERROR 1 /* a generic error */
|
|
#define EXSHELLPROC 2 /* execute a shell procedure */
|
|
#define EXEXEC 3 /* command execution failed */
|
|
|
|
static struct jmploc *handler;
|
|
static int exception;
|
|
|
|
static void exverror (int, const char *, va_list)
|
|
__attribute__((__noreturn__));
|
|
|
|
/*
|
|
* Called to raise an exception. Since C doesn't include exceptions, we
|
|
* just do a longjmp to the exception handler. The type of exception is
|
|
* stored in the global variable "exception".
|
|
*/
|
|
|
|
static void exraise (int) __attribute__((__noreturn__));
|
|
|
|
static void
|
|
exraise(int e)
|
|
{
|
|
#ifdef DEBUG
|
|
if (handler == NULL)
|
|
abort();
|
|
#endif
|
|
flushall();
|
|
exception = e;
|
|
longjmp(handler->loc, 1);
|
|
}
|
|
|
|
|
|
/*
|
|
* Called from trap.c when a SIGINT is received. (If the user specifies
|
|
* that SIGINT is to be trapped or ignored using the trap builtin, then
|
|
* this routine is not called.) Suppressint is nonzero when interrupts
|
|
* are held using the INTOFF macro. The call to _exit is necessary because
|
|
* there is a short period after a fork before the signal handlers are
|
|
* set to the appropriate value for the child. (The test for iflag is
|
|
* just defensive programming.)
|
|
*/
|
|
|
|
static void
|
|
onint(void) {
|
|
sigset_t mysigset;
|
|
|
|
if (suppressint) {
|
|
intpending++;
|
|
return;
|
|
}
|
|
intpending = 0;
|
|
sigemptyset(&mysigset);
|
|
sigprocmask(SIG_SETMASK, &mysigset, NULL);
|
|
if (rootshell && iflag)
|
|
exraise(EXINT);
|
|
else {
|
|
signal(SIGINT, SIG_DFL);
|
|
raise(SIGINT);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
static char *commandname; /* currently executing command */
|
|
|
|
/*
|
|
* Exverror is called to raise the error exception. If the first argument
|
|
* is not NULL then error prints an error message using printf style
|
|
* formatting. It then raises the error exception.
|
|
*/
|
|
static void
|
|
exverror(int cond, const char *msg, va_list ap)
|
|
{
|
|
CLEAR_PENDING_INT;
|
|
INTOFF;
|
|
|
|
#ifdef DEBUG
|
|
if (msg)
|
|
TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
|
|
else
|
|
TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
|
|
#endif
|
|
if (msg) {
|
|
if (commandname)
|
|
out2fmt("%s: ", commandname);
|
|
vfprintf(stderr, msg, ap);
|
|
out2c('\n');
|
|
}
|
|
exraise(cond);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
static void
|
|
error(const char *msg, ...)
|
|
{
|
|
va_list ap;
|
|
va_start(ap, msg);
|
|
exverror(EXERROR, msg, ap);
|
|
/* NOTREACHED */
|
|
va_end(ap);
|
|
}
|
|
|
|
|
|
static void
|
|
exerror(int cond, const char *msg, ...)
|
|
{
|
|
va_list ap;
|
|
va_start(ap, msg);
|
|
exverror(cond, msg, ap);
|
|
/* NOTREACHED */
|
|
va_end(ap);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Table of error messages.
|
|
*/
|
|
|
|
struct errname {
|
|
short errcode; /* error number */
|
|
char action; /* operation which encountered the error */
|
|
};
|
|
|
|
/*
|
|
* Types of operations (passed to the errmsg routine).
|
|
*/
|
|
|
|
#define E_OPEN 01 /* opening a file */
|
|
#define E_CREAT 02 /* creating a file */
|
|
#define E_EXEC 04 /* executing a program */
|
|
|
|
#define ALL (E_OPEN|E_CREAT|E_EXEC)
|
|
|
|
static const struct errname errormsg[] = {
|
|
{ EINTR, ALL },
|
|
{ EACCES, ALL },
|
|
{ EIO, ALL },
|
|
{ ENOENT, E_OPEN },
|
|
{ ENOENT, E_CREAT },
|
|
{ ENOENT, E_EXEC },
|
|
{ ENOTDIR, E_OPEN },
|
|
{ ENOTDIR, E_CREAT },
|
|
{ ENOTDIR, E_EXEC },
|
|
{ EISDIR, ALL },
|
|
{ EEXIST, E_CREAT },
|
|
#ifdef EMFILE
|
|
{ EMFILE, ALL },
|
|
#endif
|
|
{ ENFILE, ALL },
|
|
{ ENOSPC, ALL },
|
|
#ifdef EDQUOT
|
|
{ EDQUOT, ALL },
|
|
#endif
|
|
#ifdef ENOSR
|
|
{ ENOSR, ALL },
|
|
#endif
|
|
{ ENXIO, ALL },
|
|
{ EROFS, ALL },
|
|
{ ETXTBSY, ALL },
|
|
#ifdef EAGAIN
|
|
{ EAGAIN, E_EXEC },
|
|
#endif
|
|
{ ENOMEM, ALL },
|
|
#ifdef ENOLINK
|
|
{ ENOLINK, ALL },
|
|
#endif
|
|
#ifdef EMULTIHOP
|
|
{ EMULTIHOP, ALL },
|
|
#endif
|
|
#ifdef ECOMM
|
|
{ ECOMM, ALL },
|
|
#endif
|
|
#ifdef ESTALE
|
|
{ ESTALE, ALL },
|
|
#endif
|
|
#ifdef ETIMEDOUT
|
|
{ ETIMEDOUT, ALL },
|
|
#endif
|
|
#ifdef ELOOP
|
|
{ ELOOP, ALL },
|
|
#endif
|
|
{ E2BIG, E_EXEC },
|
|
#ifdef ELIBACC
|
|
{ ELIBACC, E_EXEC },
|
|
#endif
|
|
};
|
|
|
|
#define ERRNAME_SIZE (sizeof(errormsg)/sizeof(struct errname))
|
|
|
|
/*
|
|
* Return a string describing an error. The returned string may be a
|
|
* pointer to a static buffer that will be overwritten on the next call.
|
|
* Action describes the operation that got the error.
|
|
*/
|
|
|
|
static const char *
|
|
errmsg(int e, int action)
|
|
{
|
|
struct errname const *ep;
|
|
static char buf[12];
|
|
|
|
for (ep = errormsg ; ep < errormsg+ERRNAME_SIZE; ep++) {
|
|
if (ep->errcode == e && (ep->action & action) != 0)
|
|
return strerror(e);
|
|
}
|
|
|
|
snprintf(buf, sizeof buf, "error %d", e);
|
|
return buf;
|
|
}
|
|
|
|
|
|
#ifdef ASH_OPTIMIZE_FOR_SIZE
|
|
static void
|
|
__inton() {
|
|
if (--suppressint == 0 && intpending) {
|
|
onint();
|
|
}
|
|
}
|
|
static void forceinton (void) {
|
|
suppressint = 0;
|
|
if (intpending)
|
|
onint();
|
|
}
|
|
#endif
|
|
|
|
/* flags in argument to evaltree */
|
|
#define EV_EXIT 01 /* exit after evaluating tree */
|
|
#define EV_TESTED 02 /* exit status is checked; ignore -e flag */
|
|
#define EV_BACKCMD 04 /* command executing within back quotes */
|
|
|
|
static int evalskip; /* set if we are skipping commands */
|
|
static int skipcount; /* number of levels to skip */
|
|
static int loopnest; /* current loop nesting level */
|
|
static int funcnest; /* depth of function calls */
|
|
|
|
|
|
static struct strlist *cmdenviron; /* environment for builtin command */
|
|
static int exitstatus; /* exit status of last command */
|
|
static int oexitstatus; /* saved exit status */
|
|
|
|
static void evalsubshell (const union node *, int);
|
|
static void expredir (union node *);
|
|
static void prehash (union node *);
|
|
static void eprintlist (struct strlist *);
|
|
|
|
static union node *parsecmd(int);
|
|
/*
|
|
* Called to reset things after an exception.
|
|
*/
|
|
|
|
/*
|
|
* The eval commmand.
|
|
*/
|
|
static void evalstring (char *, int);
|
|
|
|
static int
|
|
evalcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
char *p;
|
|
char *concat;
|
|
char **ap;
|
|
|
|
if (argc > 1) {
|
|
p = argv[1];
|
|
if (argc > 2) {
|
|
STARTSTACKSTR(concat);
|
|
ap = argv + 2;
|
|
for (;;) {
|
|
while (*p)
|
|
STPUTC(*p++, concat);
|
|
if ((p = *ap++) == NULL)
|
|
break;
|
|
STPUTC(' ', concat);
|
|
}
|
|
STPUTC('\0', concat);
|
|
p = grabstackstr(concat);
|
|
}
|
|
evalstring(p, EV_TESTED);
|
|
}
|
|
return exitstatus;
|
|
}
|
|
|
|
/*
|
|
* Execute a command or commands contained in a string.
|
|
*/
|
|
|
|
static void evaltree (union node *, int);
|
|
static void setinputstring (char *);
|
|
static void popfile (void);
|
|
static void setstackmark(struct stackmark *mark);
|
|
static void popstackmark(struct stackmark *mark);
|
|
|
|
|
|
static void
|
|
evalstring(char *s, int flag)
|
|
{
|
|
union node *n;
|
|
struct stackmark smark;
|
|
|
|
setstackmark(&smark);
|
|
setinputstring(s);
|
|
while ((n = parsecmd(0)) != NEOF) {
|
|
evaltree(n, flag);
|
|
popstackmark(&smark);
|
|
}
|
|
popfile();
|
|
popstackmark(&smark);
|
|
}
|
|
|
|
static struct builtincmd *find_builtin (const char *);
|
|
static void expandarg (union node *, struct arglist *, int);
|
|
static void calcsize (const union node *);
|
|
static union node *copynode (const union node *);
|
|
|
|
/*
|
|
* Make a copy of a parse tree.
|
|
*/
|
|
|
|
static int funcblocksize; /* size of structures in function */
|
|
static int funcstringsize; /* size of strings in node */
|
|
static pointer funcblock; /* block to allocate function from */
|
|
static char *funcstring; /* block to allocate strings from */
|
|
|
|
|
|
static inline union node *
|
|
copyfunc(union node *n)
|
|
{
|
|
if (n == NULL)
|
|
return NULL;
|
|
funcblocksize = 0;
|
|
funcstringsize = 0;
|
|
calcsize(n);
|
|
funcblock = ckmalloc(funcblocksize + funcstringsize);
|
|
funcstring = (char *) funcblock + funcblocksize;
|
|
return copynode(n);
|
|
}
|
|
|
|
/*
|
|
* Free a parse tree.
|
|
*/
|
|
|
|
static void
|
|
freefunc(union node *n)
|
|
{
|
|
if (n)
|
|
ckfree(n);
|
|
}
|
|
|
|
|
|
/*
|
|
* Add a new command entry, replacing any existing command entry for
|
|
* the same name.
|
|
*/
|
|
|
|
static inline void
|
|
addcmdentry(char *name, struct cmdentry *entry)
|
|
{
|
|
struct tblentry *cmdp;
|
|
|
|
INTOFF;
|
|
cmdp = cmdlookup(name, 1);
|
|
if (cmdp->cmdtype == CMDFUNCTION) {
|
|
freefunc(cmdp->param.func);
|
|
}
|
|
cmdp->cmdtype = entry->cmdtype;
|
|
cmdp->param = entry->u;
|
|
INTON;
|
|
}
|
|
|
|
static inline void
|
|
evalloop(const union node *n, int flags)
|
|
{
|
|
int status;
|
|
|
|
loopnest++;
|
|
status = 0;
|
|
for (;;) {
|
|
evaltree(n->nbinary.ch1, EV_TESTED);
|
|
if (evalskip) {
|
|
skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
|
|
evalskip = 0;
|
|
continue;
|
|
}
|
|
if (evalskip == SKIPBREAK && --skipcount <= 0)
|
|
evalskip = 0;
|
|
break;
|
|
}
|
|
if (n->type == NWHILE) {
|
|
if (exitstatus != 0)
|
|
break;
|
|
} else {
|
|
if (exitstatus == 0)
|
|
break;
|
|
}
|
|
evaltree(n->nbinary.ch2, flags & EV_TESTED);
|
|
status = exitstatus;
|
|
if (evalskip)
|
|
goto skipping;
|
|
}
|
|
loopnest--;
|
|
exitstatus = status;
|
|
}
|
|
|
|
static void
|
|
evalfor(const union node *n, int flags)
|
|
{
|
|
struct arglist arglist;
|
|
union node *argp;
|
|
struct strlist *sp;
|
|
struct stackmark smark;
|
|
|
|
setstackmark(&smark);
|
|
arglist.lastp = &arglist.list;
|
|
for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
|
|
oexitstatus = exitstatus;
|
|
expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
|
|
if (evalskip)
|
|
goto out;
|
|
}
|
|
*arglist.lastp = NULL;
|
|
|
|
exitstatus = 0;
|
|
loopnest++;
|
|
for (sp = arglist.list ; sp ; sp = sp->next) {
|
|
setvar(n->nfor.var, sp->text, 0);
|
|
evaltree(n->nfor.body, flags & EV_TESTED);
|
|
if (evalskip) {
|
|
if (evalskip == SKIPCONT && --skipcount <= 0) {
|
|
evalskip = 0;
|
|
continue;
|
|
}
|
|
if (evalskip == SKIPBREAK && --skipcount <= 0)
|
|
evalskip = 0;
|
|
break;
|
|
}
|
|
}
|
|
loopnest--;
|
|
out:
|
|
popstackmark(&smark);
|
|
}
|
|
|
|
static inline void
|
|
evalcase(const union node *n, int flags)
|
|
{
|
|
union node *cp;
|
|
union node *patp;
|
|
struct arglist arglist;
|
|
struct stackmark smark;
|
|
|
|
setstackmark(&smark);
|
|
arglist.lastp = &arglist.list;
|
|
oexitstatus = exitstatus;
|
|
expandarg(n->ncase.expr, &arglist, EXP_TILDE);
|
|
for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
|
|
for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
|
|
if (casematch(patp, arglist.list->text)) {
|
|
if (evalskip == 0) {
|
|
evaltree(cp->nclist.body, flags);
|
|
}
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
popstackmark(&smark);
|
|
}
|
|
|
|
/*
|
|
* Evaluate a pipeline. All the processes in the pipeline are children
|
|
* of the process creating the pipeline. (This differs from some versions
|
|
* of the shell, which make the last process in a pipeline the parent
|
|
* of all the rest.)
|
|
*/
|
|
|
|
static inline void evalpipe(union node *n)
|
|
{
|
|
struct job *jp;
|
|
struct nodelist *lp;
|
|
int pipelen;
|
|
int prevfd;
|
|
int pip[2];
|
|
|
|
TRACE(("evalpipe(0x%lx) called\n", (long)n));
|
|
pipelen = 0;
|
|
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
|
|
pipelen++;
|
|
INTOFF;
|
|
jp = makejob(n, pipelen);
|
|
prevfd = -1;
|
|
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
|
|
prehash(lp->n);
|
|
pip[1] = -1;
|
|
if (lp->next) {
|
|
if (pipe(pip) < 0) {
|
|
close(prevfd);
|
|
error("Pipe call failed");
|
|
}
|
|
}
|
|
if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
|
|
INTON;
|
|
if (prevfd > 0) {
|
|
close(0);
|
|
dup_as_newfd(prevfd, 0);
|
|
close(prevfd);
|
|
if (pip[0] == 0) {
|
|
pip[0] = -1;
|
|
}
|
|
}
|
|
if (pip[1] >= 0) {
|
|
if (pip[0] >= 0) {
|
|
close(pip[0]);
|
|
}
|
|
if (pip[1] != 1) {
|
|
close(1);
|
|
dup_as_newfd(pip[1], 1);
|
|
close(pip[1]);
|
|
}
|
|
}
|
|
evaltree(lp->n, EV_EXIT);
|
|
}
|
|
if (prevfd >= 0)
|
|
close(prevfd);
|
|
prevfd = pip[0];
|
|
close(pip[1]);
|
|
}
|
|
INTON;
|
|
if (n->npipe.backgnd == 0) {
|
|
INTOFF;
|
|
exitstatus = waitforjob(jp);
|
|
TRACE(("evalpipe: job done exit status %d\n", exitstatus));
|
|
INTON;
|
|
}
|
|
}
|
|
|
|
static void find_command (const char *, struct cmdentry *, int, const char *);
|
|
|
|
static int
|
|
isassignment(const char *word) {
|
|
if (!is_name(*word)) {
|
|
return 0;
|
|
}
|
|
do {
|
|
word++;
|
|
} while (is_in_name(*word));
|
|
return *word == '=';
|
|
}
|
|
|
|
|
|
static void
|
|
evalcommand(union node *cmd, int flags)
|
|
{
|
|
struct stackmark smark;
|
|
union node *argp;
|
|
struct arglist arglist;
|
|
struct arglist varlist;
|
|
char **argv;
|
|
int argc;
|
|
char **envp;
|
|
struct strlist *sp;
|
|
int mode;
|
|
struct cmdentry cmdentry;
|
|
struct job *jp;
|
|
char *volatile savecmdname;
|
|
volatile struct shparam saveparam;
|
|
struct localvar *volatile savelocalvars;
|
|
volatile int e;
|
|
char *lastarg;
|
|
const char *path;
|
|
const struct builtincmd *firstbltin;
|
|
struct jmploc *volatile savehandler;
|
|
struct jmploc jmploc;
|
|
#if __GNUC__
|
|
/* Avoid longjmp clobbering */
|
|
(void) &argv;
|
|
(void) &argc;
|
|
(void) &lastarg;
|
|
(void) &flags;
|
|
#endif
|
|
|
|
/* First expand the arguments. */
|
|
TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
|
|
setstackmark(&smark);
|
|
arglist.lastp = &arglist.list;
|
|
varlist.lastp = &varlist.list;
|
|
arglist.list = 0;
|
|
oexitstatus = exitstatus;
|
|
exitstatus = 0;
|
|
path = pathval();
|
|
for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
|
|
expandarg(argp, &varlist, EXP_VARTILDE);
|
|
}
|
|
for (
|
|
argp = cmd->ncmd.args; argp && !arglist.list;
|
|
argp = argp->narg.next
|
|
) {
|
|
expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
|
|
}
|
|
if (argp) {
|
|
struct builtincmd *bcmd;
|
|
int pseudovarflag;
|
|
bcmd = find_builtin(arglist.list->text);
|
|
pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
|
|
for (; argp; argp = argp->narg.next) {
|
|
if (pseudovarflag && isassignment(argp->narg.text)) {
|
|
expandarg(argp, &arglist, EXP_VARTILDE);
|
|
continue;
|
|
}
|
|
expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
|
|
}
|
|
}
|
|
*arglist.lastp = NULL;
|
|
*varlist.lastp = NULL;
|
|
expredir(cmd->ncmd.redirect);
|
|
argc = 0;
|
|
for (sp = arglist.list ; sp ; sp = sp->next)
|
|
argc++;
|
|
argv = stalloc(sizeof (char *) * (argc + 1));
|
|
|
|
for (sp = arglist.list ; sp ; sp = sp->next) {
|
|
TRACE(("evalcommand arg: %s\n", sp->text));
|
|
*argv++ = sp->text;
|
|
}
|
|
*argv = NULL;
|
|
lastarg = NULL;
|
|
if (iflag && funcnest == 0 && argc > 0)
|
|
lastarg = argv[-1];
|
|
argv -= argc;
|
|
|
|
/* Print the command if xflag is set. */
|
|
if (xflag) {
|
|
out2c('+');
|
|
eprintlist(varlist.list);
|
|
eprintlist(arglist.list);
|
|
out2c('\n');
|
|
}
|
|
|
|
/* Now locate the command. */
|
|
if (argc == 0) {
|
|
cmdentry.cmdtype = CMDBUILTIN;
|
|
firstbltin = cmdentry.u.cmd = BLTINCMD;
|
|
} else {
|
|
const char *oldpath;
|
|
int findflag = DO_ERR;
|
|
int oldfindflag;
|
|
|
|
/*
|
|
* Modify the command lookup path, if a PATH= assignment
|
|
* is present
|
|
*/
|
|
for (sp = varlist.list ; sp ; sp = sp->next)
|
|
if (varequal(sp->text, defpathvar)) {
|
|
path = sp->text + 5;
|
|
findflag |= DO_BRUTE;
|
|
}
|
|
oldpath = path;
|
|
oldfindflag = findflag;
|
|
firstbltin = 0;
|
|
for(;;) {
|
|
find_command(argv[0], &cmdentry, findflag, path);
|
|
if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */
|
|
exitstatus = 127;
|
|
goto out;
|
|
}
|
|
/* implement bltin and command here */
|
|
if (cmdentry.cmdtype != CMDBUILTIN) {
|
|
break;
|
|
}
|
|
if (!firstbltin) {
|
|
firstbltin = cmdentry.u.cmd;
|
|
}
|
|
if (cmdentry.u.cmd == BLTINCMD) {
|
|
for(;;) {
|
|
struct builtincmd *bcmd;
|
|
|
|
argv++;
|
|
if (--argc == 0)
|
|
goto found;
|
|
if (!(bcmd = find_builtin(*argv))) {
|
|
out2fmt("%s: not found\n", *argv);
|
|
exitstatus = 127;
|
|
goto out;
|
|
}
|
|
cmdentry.u.cmd = bcmd;
|
|
if (bcmd != BLTINCMD)
|
|
break;
|
|
}
|
|
}
|
|
if (cmdentry.u.cmd == find_builtin("command")) {
|
|
argv++;
|
|
if (--argc == 0) {
|
|
goto found;
|
|
}
|
|
if (*argv[0] == '-') {
|
|
if (!equal(argv[0], "-p")) {
|
|
argv--;
|
|
argc++;
|
|
break;
|
|
}
|
|
argv++;
|
|
if (--argc == 0) {
|
|
goto found;
|
|
}
|
|
path = defpath;
|
|
findflag |= DO_BRUTE;
|
|
} else {
|
|
path = oldpath;
|
|
findflag = oldfindflag;
|
|
}
|
|
findflag |= DO_NOFUN;
|
|
continue;
|
|
}
|
|
found:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Fork off a child process if necessary. */
|
|
if (cmd->ncmd.backgnd
|
|
|| (cmdentry.cmdtype == CMDNORMAL && (flags & EV_EXIT) == 0)
|
|
) {
|
|
jp = makejob(cmd, 1);
|
|
mode = cmd->ncmd.backgnd;
|
|
if (forkshell(jp, cmd, mode) != 0)
|
|
goto parent; /* at end of routine */
|
|
flags |= EV_EXIT;
|
|
}
|
|
|
|
/* This is the child process if a fork occurred. */
|
|
/* Execute the command. */
|
|
if (cmdentry.cmdtype == CMDFUNCTION) {
|
|
#ifdef DEBUG
|
|
trputs("Shell function: "); trargs(argv);
|
|
#endif
|
|
exitstatus = oexitstatus;
|
|
redirect(cmd->ncmd.redirect, REDIR_PUSH);
|
|
saveparam = shellparam;
|
|
shellparam.malloc = 0;
|
|
shellparam.nparam = argc - 1;
|
|
shellparam.p = argv + 1;
|
|
INTOFF;
|
|
savelocalvars = localvars;
|
|
localvars = NULL;
|
|
INTON;
|
|
if (setjmp(jmploc.loc)) {
|
|
if (exception == EXSHELLPROC) {
|
|
freeparam((volatile struct shparam *)
|
|
&saveparam);
|
|
} else {
|
|
saveparam.optind = shellparam.optind;
|
|
saveparam.optoff = shellparam.optoff;
|
|
freeparam(&shellparam);
|
|
shellparam = saveparam;
|
|
}
|
|
poplocalvars();
|
|
localvars = savelocalvars;
|
|
handler = savehandler;
|
|
longjmp(handler->loc, 1);
|
|
}
|
|
savehandler = handler;
|
|
handler = &jmploc;
|
|
for (sp = varlist.list ; sp ; sp = sp->next)
|
|
mklocal(sp->text);
|
|
funcnest++;
|
|
evaltree(cmdentry.u.func, flags & EV_TESTED);
|
|
funcnest--;
|
|
INTOFF;
|
|
poplocalvars();
|
|
localvars = savelocalvars;
|
|
saveparam.optind = shellparam.optind;
|
|
saveparam.optoff = shellparam.optoff;
|
|
freeparam(&shellparam);
|
|
shellparam = saveparam;
|
|
handler = savehandler;
|
|
popredir();
|
|
INTON;
|
|
if (evalskip == SKIPFUNC) {
|
|
evalskip = 0;
|
|
skipcount = 0;
|
|
}
|
|
if (flags & EV_EXIT)
|
|
exitshell(exitstatus);
|
|
} else if (cmdentry.cmdtype == CMDBUILTIN) {
|
|
#ifdef DEBUG
|
|
trputs("builtin command: "); trargs(argv);
|
|
#endif
|
|
mode = (cmdentry.u.cmd == EXECCMD)? 0 : REDIR_PUSH;
|
|
redirect(cmd->ncmd.redirect, mode);
|
|
savecmdname = commandname;
|
|
if (IS_BUILTIN_SPECIAL(firstbltin)) {
|
|
listsetvar(varlist.list);
|
|
} else {
|
|
cmdenviron = varlist.list;
|
|
}
|
|
e = -1;
|
|
if (setjmp(jmploc.loc)) {
|
|
e = exception;
|
|
exitstatus = (e == EXINT)? SIGINT+128 : 2;
|
|
goto cmddone;
|
|
}
|
|
savehandler = handler;
|
|
handler = &jmploc;
|
|
commandname = argv[0];
|
|
argptr = argv + 1;
|
|
optptr = NULL; /* initialize nextopt */
|
|
exitstatus = (*cmdentry.u.cmd->builtinfunc)(argc, argv);
|
|
flushall();
|
|
cmddone:
|
|
cmdenviron = NULL;
|
|
if (e != EXSHELLPROC) {
|
|
commandname = savecmdname;
|
|
if (flags & EV_EXIT)
|
|
exitshell(exitstatus);
|
|
}
|
|
handler = savehandler;
|
|
if (e != -1) {
|
|
if ((e != EXERROR && e != EXEXEC)
|
|
|| cmdentry.u.cmd == BLTINCMD
|
|
|| cmdentry.u.cmd == DOTCMD
|
|
|| cmdentry.u.cmd == EVALCMD
|
|
|| cmdentry.u.cmd == EXECCMD)
|
|
exraise(e);
|
|
FORCEINTON;
|
|
}
|
|
if (cmdentry.u.cmd != EXECCMD)
|
|
popredir();
|
|
} else {
|
|
#ifdef DEBUG
|
|
trputs("normal command: "); trargs(argv);
|
|
#endif
|
|
redirect(cmd->ncmd.redirect, 0);
|
|
clearredir();
|
|
for (sp = varlist.list ; sp ; sp = sp->next)
|
|
setvareq(sp->text, VEXPORT|VSTACK);
|
|
envp = environment();
|
|
shellexec(argv, envp, path, cmdentry.u.index);
|
|
}
|
|
goto out;
|
|
|
|
parent: /* parent process gets here (if we forked) */
|
|
if (mode == 0) { /* argument to fork */
|
|
INTOFF;
|
|
exitstatus = waitforjob(jp);
|
|
INTON;
|
|
}
|
|
|
|
out:
|
|
if (lastarg)
|
|
setvar("_", lastarg, 0);
|
|
popstackmark(&smark);
|
|
}
|
|
|
|
/*
|
|
* Evaluate a parse tree. The value is left in the global variable
|
|
* exitstatus.
|
|
*/
|
|
static void
|
|
evaltree(n, flags)
|
|
union node *n;
|
|
int flags;
|
|
{
|
|
int checkexit = 0;
|
|
if (n == NULL) {
|
|
TRACE(("evaltree(NULL) called\n"));
|
|
goto out;
|
|
}
|
|
TRACE(("evaltree(0x%lx: %d) called\n", (long)n, n->type));
|
|
switch (n->type) {
|
|
case NSEMI:
|
|
evaltree(n->nbinary.ch1, flags & EV_TESTED);
|
|
if (evalskip)
|
|
goto out;
|
|
evaltree(n->nbinary.ch2, flags);
|
|
break;
|
|
case NAND:
|
|
evaltree(n->nbinary.ch1, EV_TESTED);
|
|
if (evalskip || exitstatus != 0)
|
|
goto out;
|
|
evaltree(n->nbinary.ch2, flags);
|
|
break;
|
|
case NOR:
|
|
evaltree(n->nbinary.ch1, EV_TESTED);
|
|
if (evalskip || exitstatus == 0)
|
|
goto out;
|
|
evaltree(n->nbinary.ch2, flags);
|
|
break;
|
|
case NREDIR:
|
|
expredir(n->nredir.redirect);
|
|
redirect(n->nredir.redirect, REDIR_PUSH);
|
|
evaltree(n->nredir.n, flags);
|
|
popredir();
|
|
break;
|
|
case NSUBSHELL:
|
|
evalsubshell(n, flags);
|
|
break;
|
|
case NBACKGND:
|
|
evalsubshell(n, flags);
|
|
break;
|
|
case NIF: {
|
|
evaltree(n->nif.test, EV_TESTED);
|
|
if (evalskip)
|
|
goto out;
|
|
if (exitstatus == 0)
|
|
evaltree(n->nif.ifpart, flags);
|
|
else if (n->nif.elsepart)
|
|
evaltree(n->nif.elsepart, flags);
|
|
else
|
|
exitstatus = 0;
|
|
break;
|
|
}
|
|
case NWHILE:
|
|
case NUNTIL:
|
|
evalloop(n, flags);
|
|
break;
|
|
case NFOR:
|
|
evalfor(n, flags);
|
|
break;
|
|
case NCASE:
|
|
evalcase(n, flags);
|
|
break;
|
|
case NDEFUN: {
|
|
struct builtincmd *bcmd;
|
|
struct cmdentry entry;
|
|
if (
|
|
(bcmd = find_builtin(n->narg.text)) &&
|
|
IS_BUILTIN_SPECIAL(bcmd)
|
|
) {
|
|
out2fmt("%s is a special built-in\n", n->narg.text);
|
|
exitstatus = 1;
|
|
break;
|
|
}
|
|
entry.cmdtype = CMDFUNCTION;
|
|
entry.u.func = copyfunc(n->narg.next);
|
|
addcmdentry(n->narg.text, &entry);
|
|
exitstatus = 0;
|
|
break;
|
|
}
|
|
case NNOT:
|
|
evaltree(n->nnot.com, EV_TESTED);
|
|
exitstatus = !exitstatus;
|
|
break;
|
|
|
|
case NPIPE:
|
|
evalpipe(n);
|
|
checkexit = 1;
|
|
break;
|
|
case NCMD:
|
|
evalcommand(n, flags);
|
|
checkexit = 1;
|
|
break;
|
|
#ifdef DEBUG
|
|
default:
|
|
printf("Node type = %d\n", n->type);
|
|
break;
|
|
#endif
|
|
}
|
|
out:
|
|
if (pendingsigs)
|
|
dotrap();
|
|
if (
|
|
flags & EV_EXIT ||
|
|
(checkexit && eflag && exitstatus && !(flags & EV_TESTED))
|
|
)
|
|
exitshell(exitstatus);
|
|
}
|
|
|
|
/*
|
|
* Kick off a subshell to evaluate a tree.
|
|
*/
|
|
|
|
static void
|
|
evalsubshell(const union node *n, int flags)
|
|
{
|
|
struct job *jp;
|
|
int backgnd = (n->type == NBACKGND);
|
|
|
|
expredir(n->nredir.redirect);
|
|
jp = makejob(n, 1);
|
|
if (forkshell(jp, n, backgnd) == 0) {
|
|
if (backgnd)
|
|
flags &=~ EV_TESTED;
|
|
redirect(n->nredir.redirect, 0);
|
|
evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */
|
|
}
|
|
if (! backgnd) {
|
|
INTOFF;
|
|
exitstatus = waitforjob(jp);
|
|
INTON;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Compute the names of the files in a redirection list.
|
|
*/
|
|
|
|
static void fixredir(union node *n, const char *text, int err);
|
|
|
|
static void
|
|
expredir(union node *n)
|
|
{
|
|
union node *redir;
|
|
|
|
for (redir = n ; redir ; redir = redir->nfile.next) {
|
|
struct arglist fn;
|
|
fn.lastp = &fn.list;
|
|
oexitstatus = exitstatus;
|
|
switch (redir->type) {
|
|
case NFROMTO:
|
|
case NFROM:
|
|
case NTO:
|
|
case NAPPEND:
|
|
case NTOOV:
|
|
expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
|
|
redir->nfile.expfname = fn.list->text;
|
|
break;
|
|
case NFROMFD:
|
|
case NTOFD:
|
|
if (redir->ndup.vname) {
|
|
expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
|
|
fixredir(redir, fn.list->text, 1);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Execute a command inside back quotes. If it's a builtin command, we
|
|
* want to save its output in a block obtained from malloc. Otherwise
|
|
* we fork off a subprocess and get the output of the command via a pipe.
|
|
* Should be called with interrupts off.
|
|
*/
|
|
|
|
static void
|
|
evalbackcmd(union node *n, struct backcmd *result)
|
|
{
|
|
int pip[2];
|
|
struct job *jp;
|
|
struct stackmark smark; /* unnecessary */
|
|
|
|
setstackmark(&smark);
|
|
result->fd = -1;
|
|
result->buf = NULL;
|
|
result->nleft = 0;
|
|
result->jp = NULL;
|
|
if (n == NULL) {
|
|
exitstatus = 0;
|
|
goto out;
|
|
}
|
|
exitstatus = 0;
|
|
if (pipe(pip) < 0)
|
|
error("Pipe call failed");
|
|
jp = makejob(n, 1);
|
|
if (forkshell(jp, n, FORK_NOJOB) == 0) {
|
|
FORCEINTON;
|
|
close(pip[0]);
|
|
if (pip[1] != 1) {
|
|
close(1);
|
|
dup_as_newfd(pip[1], 1);
|
|
close(pip[1]);
|
|
}
|
|
eflag = 0;
|
|
evaltree(n, EV_EXIT);
|
|
}
|
|
close(pip[1]);
|
|
result->fd = pip[0];
|
|
result->jp = jp;
|
|
out:
|
|
popstackmark(&smark);
|
|
TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
|
|
result->fd, result->buf, result->nleft, result->jp));
|
|
}
|
|
|
|
|
|
/*
|
|
* Execute a simple command.
|
|
*/
|
|
|
|
/*
|
|
* Search for a command. This is called before we fork so that the
|
|
* location of the command will be available in the parent as well as
|
|
* the child. The check for "goodname" is an overly conservative
|
|
* check that the name will not be subject to expansion.
|
|
*/
|
|
|
|
static void
|
|
prehash(n)
|
|
union node *n;
|
|
{
|
|
struct cmdentry entry;
|
|
|
|
if (n->type == NCMD && n->ncmd.args)
|
|
if (goodname(n->ncmd.args->narg.text))
|
|
find_command(n->ncmd.args->narg.text, &entry, 0,
|
|
pathval());
|
|
}
|
|
|
|
|
|
/*
|
|
* Builtin commands. Builtin commands whose functions are closely
|
|
* tied to evaluation are implemented here.
|
|
*/
|
|
|
|
/*
|
|
* No command given, or a bltin command with no arguments. Set the
|
|
* specified variables.
|
|
*/
|
|
|
|
int
|
|
bltincmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
/*
|
|
* Preserve exitstatus of a previous possible redirection
|
|
* as POSIX mandates
|
|
*/
|
|
return exitstatus;
|
|
}
|
|
|
|
|
|
/*
|
|
* Handle break and continue commands. Break, continue, and return are
|
|
* all handled by setting the evalskip flag. The evaluation routines
|
|
* above all check this flag, and if it is set they start skipping
|
|
* commands rather than executing them. The variable skipcount is
|
|
* the number of loops to break/continue, or the number of function
|
|
* levels to return. (The latter is always 1.) It should probably
|
|
* be an error to break out of more loops than exist, but it isn't
|
|
* in the standard shell so we don't make it one here.
|
|
*/
|
|
|
|
static int
|
|
breakcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
int n = argc > 1 ? number(argv[1]) : 1;
|
|
|
|
if (n > loopnest)
|
|
n = loopnest;
|
|
if (n > 0) {
|
|
evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
|
|
skipcount = n;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* The return command.
|
|
*/
|
|
|
|
static int
|
|
returncmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
int ret = argc > 1 ? number(argv[1]) : oexitstatus;
|
|
|
|
if (funcnest) {
|
|
evalskip = SKIPFUNC;
|
|
skipcount = 1;
|
|
return ret;
|
|
}
|
|
else {
|
|
/* Do what ksh does; skip the rest of the file */
|
|
evalskip = SKIPFILE;
|
|
skipcount = 1;
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
|
|
#ifndef BB_TRUE_FALSE
|
|
static int
|
|
false_main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int
|
|
true_main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Controls whether the shell is interactive or not.
|
|
*/
|
|
|
|
static void setsignal(int signo);
|
|
static void chkmail(int silent);
|
|
|
|
|
|
static void
|
|
setinteractive(int on)
|
|
{
|
|
static int is_interactive;
|
|
static int do_banner=0;
|
|
|
|
if (on == is_interactive)
|
|
return;
|
|
setsignal(SIGINT);
|
|
setsignal(SIGQUIT);
|
|
setsignal(SIGTERM);
|
|
chkmail(1);
|
|
is_interactive = on;
|
|
if (do_banner==0 && is_interactive) {
|
|
/* Looks like they want an interactive shell */
|
|
printf( "\n\n" BB_BANNER " Built-in shell (ash)\n");
|
|
printf( "Enter 'help' for a list of built-in commands.\n\n");
|
|
do_banner=1;
|
|
}
|
|
}
|
|
|
|
static void
|
|
optschanged(void)
|
|
{
|
|
setinteractive(iflag);
|
|
setjobctl(mflag);
|
|
}
|
|
|
|
|
|
static int
|
|
execcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
if (argc > 1) {
|
|
struct strlist *sp;
|
|
|
|
iflag = 0; /* exit on error */
|
|
mflag = 0;
|
|
optschanged();
|
|
for (sp = cmdenviron; sp ; sp = sp->next)
|
|
setvareq(sp->text, VEXPORT|VSTACK);
|
|
shellexec(argv + 1, environment(), pathval(), 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
eprintlist(struct strlist *sp)
|
|
{
|
|
for (; sp; sp = sp->next) {
|
|
out2fmt(" %s",sp->text);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Exec a program. Never returns. If you change this routine, you may
|
|
* have to change the find_command routine as well.
|
|
*/
|
|
|
|
static const char *pathopt; /* set by padvance */
|
|
|
|
static void
|
|
shellexec(argv, envp, path, idx)
|
|
char **argv, **envp;
|
|
const char *path;
|
|
int idx;
|
|
{
|
|
char *cmdname;
|
|
int e;
|
|
|
|
if (strchr(argv[0], '/') != NULL) {
|
|
tryexec(argv[0], argv, envp);
|
|
e = errno;
|
|
} else {
|
|
e = ENOENT;
|
|
while ((cmdname = padvance(&path, argv[0])) != NULL) {
|
|
if (--idx < 0 && pathopt == NULL) {
|
|
tryexec(cmdname, argv, envp);
|
|
if (errno != ENOENT && errno != ENOTDIR)
|
|
e = errno;
|
|
}
|
|
stunalloc(cmdname);
|
|
}
|
|
}
|
|
|
|
/* Map to POSIX errors */
|
|
switch (e) {
|
|
case EACCES:
|
|
exerrno = 126;
|
|
break;
|
|
case ENOENT:
|
|
exerrno = 127;
|
|
break;
|
|
default:
|
|
exerrno = 2;
|
|
break;
|
|
}
|
|
exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Clear traps on a fork.
|
|
*/
|
|
static void
|
|
clear_traps(void) {
|
|
char **tp;
|
|
|
|
for (tp = trap ; tp < &trap[NSIG] ; tp++) {
|
|
if (*tp && **tp) { /* trap not NULL or SIG_IGN */
|
|
INTOFF;
|
|
ckfree(*tp);
|
|
*tp = NULL;
|
|
if (tp != &trap[0])
|
|
setsignal(tp - trap);
|
|
INTON;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
initshellproc(void) {
|
|
|
|
#ifdef ASH_ALIAS
|
|
/* from alias.c: */
|
|
{
|
|
rmaliases();
|
|
}
|
|
#endif
|
|
/* from eval.c: */
|
|
{
|
|
exitstatus = 0;
|
|
}
|
|
|
|
/* from exec.c: */
|
|
{
|
|
deletefuncs();
|
|
}
|
|
|
|
/* from jobs.c: */
|
|
{
|
|
backgndpid = -1;
|
|
#ifdef JOBS
|
|
jobctl = 0;
|
|
#endif
|
|
}
|
|
|
|
/* from options.c: */
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NOPTS; i++)
|
|
optent_val(i) = 0;
|
|
optschanged();
|
|
|
|
}
|
|
|
|
/* from redir.c: */
|
|
{
|
|
clearredir();
|
|
}
|
|
|
|
/* from trap.c: */
|
|
{
|
|
char *sm;
|
|
|
|
clear_traps();
|
|
for (sm = sigmode ; sm < sigmode + NSIG - 1; sm++) {
|
|
if (*sm == S_IGN)
|
|
*sm = S_HARD_IGN;
|
|
}
|
|
}
|
|
|
|
/* from var.c: */
|
|
{
|
|
shprocvar();
|
|
}
|
|
}
|
|
|
|
static int preadbuffer(void);
|
|
static void pushfile (void);
|
|
|
|
/*
|
|
* Read a character from the script, returning PEOF on end of file.
|
|
* Nul characters in the input are silently discarded.
|
|
*/
|
|
|
|
#ifndef ASH_OPTIMIZE_FOR_SIZE
|
|
#define pgetc_macro() (--parsenleft >= 0? *parsenextc++ : preadbuffer())
|
|
static int
|
|
pgetc(void)
|
|
{
|
|
return pgetc_macro();
|
|
}
|
|
#else
|
|
static int
|
|
pgetc_macro(void)
|
|
{
|
|
return --parsenleft >= 0? *parsenextc++ : preadbuffer();
|
|
}
|
|
|
|
static inline int
|
|
pgetc(void)
|
|
{
|
|
return pgetc_macro();
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Undo the last call to pgetc. Only one character may be pushed back.
|
|
* PEOF may be pushed back.
|
|
*/
|
|
|
|
static void pungetc(void)
|
|
{
|
|
parsenleft++;
|
|
parsenextc--;
|
|
}
|
|
|
|
|
|
static void
|
|
popfile(void) {
|
|
struct parsefile *pf = parsefile;
|
|
|
|
INTOFF;
|
|
if (pf->fd >= 0)
|
|
close(pf->fd);
|
|
if (pf->buf)
|
|
ckfree(pf->buf);
|
|
while (pf->strpush)
|
|
popstring();
|
|
parsefile = pf->prev;
|
|
ckfree(pf);
|
|
parsenleft = parsefile->nleft;
|
|
parselleft = parsefile->lleft;
|
|
parsenextc = parsefile->nextc;
|
|
plinno = parsefile->linno;
|
|
INTON;
|
|
}
|
|
|
|
|
|
/*
|
|
* Return to top level.
|
|
*/
|
|
|
|
static void
|
|
popallfiles(void) {
|
|
while (parsefile != &basepf)
|
|
popfile();
|
|
}
|
|
|
|
/*
|
|
* Close the file(s) that the shell is reading commands from. Called
|
|
* after a fork is done.
|
|
*/
|
|
|
|
static void closescript(void)
|
|
{
|
|
popallfiles();
|
|
if (parsefile->fd > 0) {
|
|
close(parsefile->fd);
|
|
parsefile->fd = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Like setinputfile, but takes an open file descriptor. Call this with
|
|
* interrupts off.
|
|
*/
|
|
|
|
static void setinputfd(int fd, int push)
|
|
{
|
|
(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
|
|
if (push) {
|
|
pushfile();
|
|
parsefile->buf = 0;
|
|
} else {
|
|
closescript();
|
|
while (parsefile->strpush)
|
|
popstring();
|
|
}
|
|
parsefile->fd = fd;
|
|
if (parsefile->buf == NULL)
|
|
parsefile->buf = ckmalloc(BUFSIZ);
|
|
parselleft = parsenleft = 0;
|
|
plinno = 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Set the input to take input from a file. If push is set, push the
|
|
* old input onto the stack first.
|
|
*/
|
|
|
|
static void
|
|
setinputfile(const char *fname, int push)
|
|
{
|
|
int fd;
|
|
int myfileno2;
|
|
|
|
INTOFF;
|
|
if ((fd = open(fname, O_RDONLY)) < 0)
|
|
error("Can't open %s", fname);
|
|
if (fd < 10) {
|
|
myfileno2 = dup_as_newfd(fd, 10);
|
|
close(fd);
|
|
if (myfileno2 < 0)
|
|
error("Out of file descriptors");
|
|
fd = myfileno2;
|
|
}
|
|
setinputfd(fd, push);
|
|
INTON;
|
|
}
|
|
|
|
|
|
static void
|
|
tryexec(char *cmd, char **argv, char **envp)
|
|
{
|
|
int e;
|
|
|
|
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
|
|
char *name = cmd;
|
|
char** argv_l=argv;
|
|
int argc_l;
|
|
#ifdef BB_FEATURE_SH_APPLETS_ALWAYS_WIN
|
|
name = get_last_path_component(name);
|
|
#endif
|
|
argv_l=envp;
|
|
for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++)
|
|
putenv(*argv_l);
|
|
argv_l=argv;
|
|
for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++)
|
|
optind = 1;
|
|
run_applet_by_name(name, argc_l, argv);
|
|
#endif
|
|
execve(cmd, argv, envp);
|
|
e = errno;
|
|
if (e == ENOEXEC) {
|
|
INTOFF;
|
|
initshellproc();
|
|
setinputfile(cmd, 0);
|
|
commandname = arg0 = savestr(argv[0]);
|
|
setparam(argv + 1);
|
|
exraise(EXSHELLPROC);
|
|
}
|
|
errno = e;
|
|
}
|
|
|
|
static char *commandtext (const union node *);
|
|
|
|
/*
|
|
* Do a path search. The variable path (passed by reference) should be
|
|
* set to the start of the path before the first call; padvance will update
|
|
* this value as it proceeds. Successive calls to padvance will return
|
|
* the possible path expansions in sequence. If an option (indicated by
|
|
* a percent sign) appears in the path entry then the global variable
|
|
* pathopt will be set to point to it; otherwise pathopt will be set to
|
|
* NULL.
|
|
*/
|
|
|
|
static const char *pathopt;
|
|
|
|
static void growstackblock(void);
|
|
|
|
|
|
static char *
|
|
padvance(const char **path, const char *name)
|
|
{
|
|
const char *p;
|
|
char *q;
|
|
const char *start;
|
|
int len;
|
|
|
|
if (*path == NULL)
|
|
return NULL;
|
|
start = *path;
|
|
for (p = start ; *p && *p != ':' && *p != '%' ; p++);
|
|
len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
|
|
while (stackblocksize() < len)
|
|
growstackblock();
|
|
q = stackblock();
|
|
if (p != start) {
|
|
memcpy(q, start, p - start);
|
|
q += p - start;
|
|
*q++ = '/';
|
|
}
|
|
strcpy(q, name);
|
|
pathopt = NULL;
|
|
if (*p == '%') {
|
|
pathopt = ++p;
|
|
while (*p && *p != ':') p++;
|
|
}
|
|
if (*p == ':')
|
|
*path = p + 1;
|
|
else
|
|
*path = NULL;
|
|
return stalloc(len);
|
|
}
|
|
|
|
/*
|
|
* Wrapper around strcmp for qsort/bsearch/...
|
|
*/
|
|
static int
|
|
pstrcmp(const void *a, const void *b)
|
|
{
|
|
return strcmp((const char *) a, (*(const char *const *) b) + 1);
|
|
}
|
|
|
|
/*
|
|
* Find a keyword is in a sorted array.
|
|
*/
|
|
|
|
static const char *const *
|
|
findkwd(const char *s)
|
|
{
|
|
return bsearch(s, tokname_array + KWDOFFSET,
|
|
(sizeof(tokname_array)/sizeof(const char *)) - KWDOFFSET,
|
|
sizeof(const char *), pstrcmp);
|
|
}
|
|
|
|
|
|
/*** Command hashing code ***/
|
|
|
|
|
|
static int
|
|
hashcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
struct tblentry **pp;
|
|
struct tblentry *cmdp;
|
|
int c;
|
|
int verbose;
|
|
struct cmdentry entry;
|
|
char *name;
|
|
#ifdef ASH_ALIAS
|
|
const struct alias *ap;
|
|
#endif
|
|
|
|
verbose = 0;
|
|
while ((c = nextopt("rvV")) != '\0') {
|
|
if (c == 'r') {
|
|
clearcmdentry(0);
|
|
return 0;
|
|
} else if (c == 'v' || c == 'V') {
|
|
verbose = c;
|
|
}
|
|
}
|
|
if (*argptr == NULL) {
|
|
for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
|
|
for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
|
|
if (cmdp->cmdtype != CMDBUILTIN) {
|
|
printentry(cmdp, verbose);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
c = 0;
|
|
while ((name = *argptr++) != NULL) {
|
|
if ((cmdp = cmdlookup(name, 0)) != NULL
|
|
&& (cmdp->cmdtype == CMDNORMAL
|
|
|| (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
|
|
delete_cmd_entry();
|
|
#ifdef ASH_ALIAS
|
|
/* Then look at the aliases */
|
|
if ((ap = lookupalias(name, 0)) != NULL) {
|
|
if (verbose=='v')
|
|
printf("%s is an alias for %s\n", name, ap->val);
|
|
else
|
|
printalias(ap);
|
|
continue;
|
|
}
|
|
#endif
|
|
/* First look at the keywords */
|
|
if (findkwd(name)!=0) {
|
|
if (verbose=='v')
|
|
printf("%s is a shell keyword\n", name);
|
|
else
|
|
printf(snlfmt, name);
|
|
continue;
|
|
}
|
|
|
|
find_command(name, &entry, DO_ERR, pathval());
|
|
if (entry.cmdtype == CMDUNKNOWN) c = 1;
|
|
else if (verbose) {
|
|
cmdp = cmdlookup(name, 0);
|
|
if (cmdp) printentry(cmdp, verbose=='v');
|
|
flushall();
|
|
}
|
|
}
|
|
return c;
|
|
}
|
|
|
|
static void
|
|
printentry(cmdp, verbose)
|
|
struct tblentry *cmdp;
|
|
int verbose;
|
|
{
|
|
int idx;
|
|
const char *path;
|
|
char *name;
|
|
|
|
printf("%s%s", cmdp->cmdname, (verbose ? " is " : ""));
|
|
if (cmdp->cmdtype == CMDNORMAL) {
|
|
idx = cmdp->param.index;
|
|
path = pathval();
|
|
do {
|
|
name = padvance(&path, cmdp->cmdname);
|
|
stunalloc(name);
|
|
} while (--idx >= 0);
|
|
if(verbose)
|
|
out1str(name);
|
|
} else if (cmdp->cmdtype == CMDBUILTIN) {
|
|
if(verbose)
|
|
out1str("a shell builtin");
|
|
} else if (cmdp->cmdtype == CMDFUNCTION) {
|
|
if (verbose) {
|
|
INTOFF;
|
|
out1str("a function\n");
|
|
name = commandtext(cmdp->param.func);
|
|
printf("%s() {\n %s\n}", cmdp->cmdname, name);
|
|
ckfree(name);
|
|
INTON;
|
|
}
|
|
#ifdef DEBUG
|
|
} else {
|
|
error("internal error: cmdtype %d", cmdp->cmdtype);
|
|
#endif
|
|
}
|
|
printf(snlfmt, cmdp->rehash ? "*" : nullstr);
|
|
}
|
|
|
|
|
|
|
|
/*** List the available builtins ***/
|
|
|
|
|
|
static int helpcmd(int argc, char** argv)
|
|
{
|
|
int col, i;
|
|
|
|
printf("\nBuilt-in commands:\n-------------------\n");
|
|
for (col=0, i=0; i < NUMBUILTINS; i++) {
|
|
col += printf("%c%s", ((col == 0) ? '\t' : ' '),
|
|
builtincmds[i].name+1);
|
|
if (col > 60) {
|
|
printf("\n");
|
|
col = 0;
|
|
}
|
|
}
|
|
#ifdef BB_FEATURE_SH_STANDALONE_SHELL
|
|
{
|
|
extern const struct BB_applet applets[];
|
|
extern const size_t NUM_APPLETS;
|
|
|
|
for (i=0; i < NUM_APPLETS; i++) {
|
|
|
|
col += printf("%c%s", ((col == 0) ? '\t' : ' '),
|
|
applets[i].name);
|
|
if (col > 60) {
|
|
printf("\n");
|
|
col = 0;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
printf("\n\n");
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Resolve a command name. If you change this routine, you may have to
|
|
* change the shellexec routine as well.
|
|
*/
|
|
|
|
static int prefix (const char *, const char *);
|
|
|
|
static void
|
|
find_command(const char *name, struct cmdentry *entry, int act, const char *path)
|
|
{
|
|
struct tblentry *cmdp;
|
|
int idx;
|
|
int prev;
|
|
char *fullname;
|
|
struct stat statb;
|
|
int e;
|
|
int bltin;
|
|
int firstchange;
|
|
int updatetbl;
|
|
int regular;
|
|
struct builtincmd *bcmd;
|
|
|
|
/* If name contains a slash, don't use the hash table */
|
|
if (strchr(name, '/') != NULL) {
|
|
if (act & DO_ABS) {
|
|
while (stat(name, &statb) < 0) {
|
|
if (errno != ENOENT && errno != ENOTDIR)
|
|
e = errno;
|
|
entry->cmdtype = CMDUNKNOWN;
|
|
entry->u.index = -1;
|
|
return;
|
|
}
|
|
entry->cmdtype = CMDNORMAL;
|
|
entry->u.index = -1;
|
|
return;
|
|
}
|
|
entry->cmdtype = CMDNORMAL;
|
|
entry->u.index = 0;
|
|
return;
|
|
}
|
|
|
|
updatetbl = 1;
|
|
if (act & DO_BRUTE) {
|
|
firstchange = path_change(path, &bltin);
|
|
} else {
|
|
bltin = builtinloc;
|
|
firstchange = 9999;
|
|
}
|
|
|
|
/* If name is in the table, and not invalidated by cd, we're done */
|
|
if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0) {
|
|
if (cmdp->cmdtype == CMDFUNCTION) {
|
|
if (act & DO_NOFUN) {
|
|
updatetbl = 0;
|
|
} else {
|
|
goto success;
|
|
}
|
|
} else if (act & DO_BRUTE) {
|
|
if ((cmdp->cmdtype == CMDNORMAL &&
|
|
cmdp->param.index >= firstchange) ||
|
|
(cmdp->cmdtype == CMDBUILTIN &&
|
|
((builtinloc < 0 && bltin >= 0) ?
|
|
bltin : builtinloc) >= firstchange)) {
|
|
/* need to recompute the entry */
|
|
} else {
|
|
goto success;
|
|
}
|
|
} else {
|
|
goto success;
|
|
}
|
|
}
|
|
|
|
bcmd = find_builtin(name);
|
|
regular = bcmd && IS_BUILTIN_REGULAR(bcmd);
|
|
|
|
if (regular) {
|
|
if (cmdp && (cmdp->cmdtype == CMDBUILTIN)) {
|
|
goto success;
|
|
}
|
|
} else if (act & DO_BRUTE) {
|
|
if (firstchange == 0) {
|
|
updatetbl = 0;
|
|
}
|
|
}
|
|
|
|
/* If %builtin not in path, check for builtin next */
|
|
if (regular || (bltin < 0 && bcmd)) {
|
|
builtin:
|
|
if (!updatetbl) {
|
|
entry->cmdtype = CMDBUILTIN;
|
|
entry->u.cmd = bcmd;
|
|
return;
|
|
}
|
|
INTOFF;
|
|
cmdp = cmdlookup(name, 1);
|
|
cmdp->cmdtype = CMDBUILTIN;
|
|
cmdp->param.cmd = bcmd;
|
|
INTON;
|
|
goto success;
|
|
}
|
|
|
|
/* We have to search path. */
|
|
prev = -1; /* where to start */
|
|
if (cmdp && cmdp->rehash) { /* doing a rehash */
|
|
if (cmdp->cmdtype == CMDBUILTIN)
|
|
prev = builtinloc;
|
|
else
|
|
prev = cmdp->param.index;
|
|
}
|
|
|
|
e = ENOENT;
|
|
idx = -1;
|
|
loop:
|
|
while ((fullname = padvance(&path, name)) != NULL) {
|
|
stunalloc(fullname);
|
|
idx++;
|
|
if (idx >= firstchange) {
|
|
updatetbl = 0;
|
|
}
|
|
if (pathopt) {
|
|
if (prefix("builtin", pathopt)) {
|
|
if ((bcmd = find_builtin(name))) {
|
|
goto builtin;
|
|
}
|
|
continue;
|
|
} else if (!(act & DO_NOFUN) &&
|
|
prefix("func", pathopt)) {
|
|
/* handled below */
|
|
} else {
|
|
continue; /* ignore unimplemented options */
|
|
}
|
|
}
|
|
/* if rehash, don't redo absolute path names */
|
|
if (fullname[0] == '/' && idx <= prev &&
|
|
idx < firstchange) {
|
|
if (idx < prev)
|
|
continue;
|
|
TRACE(("searchexec \"%s\": no change\n", name));
|
|
goto success;
|
|
}
|
|
while (stat(fullname, &statb) < 0) {
|
|
if (errno != ENOENT && errno != ENOTDIR)
|
|
e = errno;
|
|
goto loop;
|
|
}
|
|
e = EACCES; /* if we fail, this will be the error */
|
|
if (!S_ISREG(statb.st_mode))
|
|
continue;
|
|
if (pathopt) { /* this is a %func directory */
|
|
stalloc(strlen(fullname) + 1);
|
|
readcmdfile(fullname);
|
|
if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
|
|
error("%s not defined in %s", name, fullname);
|
|
stunalloc(fullname);
|
|
goto success;
|
|
}
|
|
TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
|
|
/* If we aren't called with DO_BRUTE and cmdp is set, it must
|
|
be a function and we're being called with DO_NOFUN */
|
|
if (!updatetbl) {
|
|
entry->cmdtype = CMDNORMAL;
|
|
entry->u.index = idx;
|
|
return;
|
|
}
|
|
INTOFF;
|
|
cmdp = cmdlookup(name, 1);
|
|
cmdp->cmdtype = CMDNORMAL;
|
|
cmdp->param.index = idx;
|
|
INTON;
|
|
goto success;
|
|
}
|
|
|
|
/* We failed. If there was an entry for this command, delete it */
|
|
if (cmdp && updatetbl)
|
|
delete_cmd_entry();
|
|
if (act & DO_ERR)
|
|
out2fmt("%s: %s\n", name, errmsg(e, E_EXEC));
|
|
entry->cmdtype = CMDUNKNOWN;
|
|
return;
|
|
|
|
success:
|
|
cmdp->rehash = 0;
|
|
entry->cmdtype = cmdp->cmdtype;
|
|
entry->u = cmdp->param;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Search the table of builtin commands.
|
|
*/
|
|
|
|
static int
|
|
bstrcmp(const void *name, const void *b)
|
|
{
|
|
return strcmp((const char *)name, (*(const char *const *) b)+1);
|
|
}
|
|
|
|
static struct builtincmd *
|
|
find_builtin(const char *name)
|
|
{
|
|
struct builtincmd *bp;
|
|
|
|
bp = bsearch(name, builtincmds, NUMBUILTINS, sizeof(struct builtincmd),
|
|
bstrcmp
|
|
);
|
|
return bp;
|
|
}
|
|
|
|
|
|
/*
|
|
* Called when a cd is done. Marks all commands so the next time they
|
|
* are executed they will be rehashed.
|
|
*/
|
|
|
|
static void
|
|
hashcd(void) {
|
|
struct tblentry **pp;
|
|
struct tblentry *cmdp;
|
|
|
|
for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
|
|
for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
|
|
if (cmdp->cmdtype == CMDNORMAL
|
|
|| (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
|
|
cmdp->rehash = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Called before PATH is changed. The argument is the new value of PATH;
|
|
* pathval() still returns the old value at this point. Called with
|
|
* interrupts off.
|
|
*/
|
|
|
|
static void
|
|
changepath(const char *newval)
|
|
{
|
|
int firstchange;
|
|
int bltin;
|
|
|
|
firstchange = path_change(newval, &bltin);
|
|
if (builtinloc < 0 && bltin >= 0)
|
|
builtinloc = bltin; /* zap builtins */
|
|
clearcmdentry(firstchange);
|
|
builtinloc = bltin;
|
|
}
|
|
|
|
|
|
/*
|
|
* Clear out command entries. The argument specifies the first entry in
|
|
* PATH which has changed.
|
|
*/
|
|
|
|
static void
|
|
clearcmdentry(firstchange)
|
|
int firstchange;
|
|
{
|
|
struct tblentry **tblp;
|
|
struct tblentry **pp;
|
|
struct tblentry *cmdp;
|
|
|
|
INTOFF;
|
|
for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
|
|
pp = tblp;
|
|
while ((cmdp = *pp) != NULL) {
|
|
if ((cmdp->cmdtype == CMDNORMAL &&
|
|
cmdp->param.index >= firstchange)
|
|
|| (cmdp->cmdtype == CMDBUILTIN &&
|
|
builtinloc >= firstchange)) {
|
|
*pp = cmdp->next;
|
|
ckfree(cmdp);
|
|
} else {
|
|
pp = &cmdp->next;
|
|
}
|
|
}
|
|
}
|
|
INTON;
|
|
}
|
|
|
|
|
|
/*
|
|
* Delete all functions.
|
|
*/
|
|
|
|
static void
|
|
deletefuncs(void) {
|
|
struct tblentry **tblp;
|
|
struct tblentry **pp;
|
|
struct tblentry *cmdp;
|
|
|
|
INTOFF;
|
|
for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
|
|
pp = tblp;
|
|
while ((cmdp = *pp) != NULL) {
|
|
if (cmdp->cmdtype == CMDFUNCTION) {
|
|
*pp = cmdp->next;
|
|
freefunc(cmdp->param.func);
|
|
ckfree(cmdp);
|
|
} else {
|
|
pp = &cmdp->next;
|
|
}
|
|
}
|
|
}
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Locate a command in the command hash table. If "add" is nonzero,
|
|
* add the command to the table if it is not already present. The
|
|
* variable "lastcmdentry" is set to point to the address of the link
|
|
* pointing to the entry, so that delete_cmd_entry can delete the
|
|
* entry.
|
|
*/
|
|
|
|
static struct tblentry **lastcmdentry;
|
|
|
|
static struct tblentry *
|
|
cmdlookup(const char *name, int add)
|
|
{
|
|
int hashval;
|
|
const char *p;
|
|
struct tblentry *cmdp;
|
|
struct tblentry **pp;
|
|
|
|
p = name;
|
|
hashval = *p << 4;
|
|
while (*p)
|
|
hashval += *p++;
|
|
hashval &= 0x7FFF;
|
|
pp = &cmdtable[hashval % CMDTABLESIZE];
|
|
for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
|
|
if (equal(cmdp->cmdname, name))
|
|
break;
|
|
pp = &cmdp->next;
|
|
}
|
|
if (add && cmdp == NULL) {
|
|
INTOFF;
|
|
cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
|
|
+ strlen(name) + 1);
|
|
cmdp->next = NULL;
|
|
cmdp->cmdtype = CMDUNKNOWN;
|
|
cmdp->rehash = 0;
|
|
strcpy(cmdp->cmdname, name);
|
|
INTON;
|
|
}
|
|
lastcmdentry = pp;
|
|
return cmdp;
|
|
}
|
|
|
|
/*
|
|
* Delete the command entry returned on the last lookup.
|
|
*/
|
|
|
|
static void
|
|
delete_cmd_entry() {
|
|
struct tblentry *cmdp;
|
|
|
|
INTOFF;
|
|
cmdp = *lastcmdentry;
|
|
*lastcmdentry = cmdp->next;
|
|
ckfree(cmdp);
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static const unsigned char nodesize[26] = {
|
|
ALIGN(sizeof (struct nbinary)),
|
|
ALIGN(sizeof (struct ncmd)),
|
|
ALIGN(sizeof (struct npipe)),
|
|
ALIGN(sizeof (struct nredir)),
|
|
ALIGN(sizeof (struct nredir)),
|
|
ALIGN(sizeof (struct nredir)),
|
|
ALIGN(sizeof (struct nbinary)),
|
|
ALIGN(sizeof (struct nbinary)),
|
|
ALIGN(sizeof (struct nif)),
|
|
ALIGN(sizeof (struct nbinary)),
|
|
ALIGN(sizeof (struct nbinary)),
|
|
ALIGN(sizeof (struct nfor)),
|
|
ALIGN(sizeof (struct ncase)),
|
|
ALIGN(sizeof (struct nclist)),
|
|
ALIGN(sizeof (struct narg)),
|
|
ALIGN(sizeof (struct narg)),
|
|
ALIGN(sizeof (struct nfile)),
|
|
ALIGN(sizeof (struct nfile)),
|
|
ALIGN(sizeof (struct nfile)),
|
|
ALIGN(sizeof (struct nfile)),
|
|
ALIGN(sizeof (struct nfile)),
|
|
ALIGN(sizeof (struct ndup)),
|
|
ALIGN(sizeof (struct ndup)),
|
|
ALIGN(sizeof (struct nhere)),
|
|
ALIGN(sizeof (struct nhere)),
|
|
ALIGN(sizeof (struct nnot)),
|
|
};
|
|
|
|
|
|
|
|
/*
|
|
* Delete a function if it exists.
|
|
*/
|
|
|
|
static void
|
|
unsetfunc(char *name)
|
|
{
|
|
struct tblentry *cmdp;
|
|
|
|
if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
|
|
freefunc(cmdp->param.func);
|
|
delete_cmd_entry();
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Locate and print what a word is...
|
|
*/
|
|
|
|
static int
|
|
typecmd(int argc, char **argv)
|
|
{
|
|
int i;
|
|
int err = 0;
|
|
char *argv_a[2];
|
|
|
|
argv_a[1] = 0;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
argv_a[0] = argv[i];
|
|
argptr = argv_a;
|
|
optptr = "v";
|
|
err |= hashcmd(argc, argv);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
#ifdef ASH_CMDCMD
|
|
static int
|
|
commandcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
int c;
|
|
int default_path = 0;
|
|
int verify_only = 0;
|
|
int verbose_verify_only = 0;
|
|
|
|
while ((c = nextopt("pvV")) != '\0')
|
|
switch (c) {
|
|
case 'p':
|
|
default_path = 1;
|
|
break;
|
|
case 'v':
|
|
verify_only = 1;
|
|
break;
|
|
case 'V':
|
|
verbose_verify_only = 1;
|
|
break;
|
|
}
|
|
|
|
if (default_path + verify_only + verbose_verify_only > 1 ||
|
|
!*argptr) {
|
|
out2str(
|
|
"command [-p] command [arg ...]\n"
|
|
"command {-v|-V} command\n");
|
|
return EX_USAGE;
|
|
}
|
|
|
|
if (verify_only || verbose_verify_only) {
|
|
char *argv_a[2];
|
|
|
|
argv_a[1] = 0;
|
|
argv_a[0] = *argptr;
|
|
argptr = argv_a;
|
|
optptr = verbose_verify_only ? "v" : "V"; /* reverse special */
|
|
return hashcmd(argc, argv);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
path_change(newval, bltin)
|
|
const char *newval;
|
|
int *bltin;
|
|
{
|
|
const char *old, *new;
|
|
int idx;
|
|
int firstchange;
|
|
|
|
old = pathval();
|
|
new = newval;
|
|
firstchange = 9999; /* assume no change */
|
|
idx = 0;
|
|
*bltin = -1;
|
|
for (;;) {
|
|
if (*old != *new) {
|
|
firstchange = idx;
|
|
if ((*old == '\0' && *new == ':')
|
|
|| (*old == ':' && *new == '\0'))
|
|
firstchange++;
|
|
old = new; /* ignore subsequent differences */
|
|
}
|
|
if (*new == '\0')
|
|
break;
|
|
if (*new == '%' && *bltin < 0 && prefix("builtin", new + 1))
|
|
*bltin = idx;
|
|
if (*new == ':') {
|
|
idx++;
|
|
}
|
|
new++, old++;
|
|
}
|
|
if (builtinloc >= 0 && *bltin < 0)
|
|
firstchange = 0;
|
|
return firstchange;
|
|
}
|
|
/*
|
|
* Routines to expand arguments to commands. We have to deal with
|
|
* backquotes, shell variables, and file metacharacters.
|
|
*/
|
|
/*
|
|
* _rmescape() flags
|
|
*/
|
|
#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
|
|
#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
|
|
|
|
/*
|
|
* Structure specifying which parts of the string should be searched
|
|
* for IFS characters.
|
|
*/
|
|
|
|
struct ifsregion {
|
|
struct ifsregion *next; /* next region in list */
|
|
int begoff; /* offset of start of region */
|
|
int endoff; /* offset of end of region */
|
|
int nulonly; /* search for nul bytes only */
|
|
};
|
|
|
|
|
|
static char *expdest; /* output of current string */
|
|
static struct nodelist *argbackq; /* list of back quote expressions */
|
|
static struct ifsregion ifsfirst; /* first struct in list of ifs regions */
|
|
static struct ifsregion *ifslastp; /* last struct in list */
|
|
static struct arglist exparg; /* holds expanded arg list */
|
|
|
|
static void argstr (char *, int);
|
|
static char *exptilde (char *, int);
|
|
static void expbackq (union node *, int, int);
|
|
static int subevalvar (char *, char *, int, int, int, int, int);
|
|
static int varisset (char *, int);
|
|
static void strtodest (const char *, int, int);
|
|
static void varvalue (char *, int, int);
|
|
static void recordregion (int, int, int);
|
|
static void removerecordregions (int);
|
|
static void ifsbreakup (char *, struct arglist *);
|
|
static void ifsfree (void);
|
|
static void expandmeta (struct strlist *, int);
|
|
#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
|
|
#define preglob(p) _rmescapes((p), RMESCAPE_ALLOC | RMESCAPE_GLOB)
|
|
#if !defined(GLOB_BROKEN)
|
|
static void addglob (const glob_t *);
|
|
#endif
|
|
#endif
|
|
#if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
|
|
static void expmeta (char *, char *);
|
|
#endif
|
|
#if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
|
|
static struct strlist *expsort (struct strlist *);
|
|
static struct strlist *msort (struct strlist *, int);
|
|
#endif
|
|
static int patmatch (char *, char *, int);
|
|
#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
|
|
static int patmatch2 (char *, char *, int);
|
|
#else
|
|
static int pmatch (char *, char *, int);
|
|
#define patmatch2 patmatch
|
|
#endif
|
|
static char *cvtnum (int, char *);
|
|
|
|
/*
|
|
* Expand shell variables and backquotes inside a here document.
|
|
*/
|
|
|
|
/* arg: the document, fd: where to write the expanded version */
|
|
static inline void
|
|
expandhere(union node *arg, int fd)
|
|
{
|
|
herefd = fd;
|
|
expandarg(arg, (struct arglist *)NULL, 0);
|
|
xwrite(fd, stackblock(), expdest - stackblock());
|
|
}
|
|
|
|
|
|
/*
|
|
* Perform variable substitution and command substitution on an argument,
|
|
* placing the resulting list of arguments in arglist. If EXP_FULL is true,
|
|
* perform splitting and file name expansion. When arglist is NULL, perform
|
|
* here document expansion.
|
|
*/
|
|
|
|
static void
|
|
expandarg(arg, arglist, flag)
|
|
union node *arg;
|
|
struct arglist *arglist;
|
|
int flag;
|
|
{
|
|
struct strlist *sp;
|
|
char *p;
|
|
|
|
argbackq = arg->narg.backquote;
|
|
STARTSTACKSTR(expdest);
|
|
ifsfirst.next = NULL;
|
|
ifslastp = NULL;
|
|
argstr(arg->narg.text, flag);
|
|
if (arglist == NULL) {
|
|
return; /* here document expanded */
|
|
}
|
|
STPUTC('\0', expdest);
|
|
p = grabstackstr(expdest);
|
|
exparg.lastp = &exparg.list;
|
|
/*
|
|
* TODO - EXP_REDIR
|
|
*/
|
|
if (flag & EXP_FULL) {
|
|
ifsbreakup(p, &exparg);
|
|
*exparg.lastp = NULL;
|
|
exparg.lastp = &exparg.list;
|
|
expandmeta(exparg.list, flag);
|
|
} else {
|
|
if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
|
|
rmescapes(p);
|
|
sp = (struct strlist *)stalloc(sizeof (struct strlist));
|
|
sp->text = p;
|
|
*exparg.lastp = sp;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
ifsfree();
|
|
*exparg.lastp = NULL;
|
|
if (exparg.list) {
|
|
*arglist->lastp = exparg.list;
|
|
arglist->lastp = exparg.lastp;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Expand a variable, and return a pointer to the next character in the
|
|
* input string.
|
|
*/
|
|
|
|
static inline char * evalvar(char *p, int flag)
|
|
{
|
|
int subtype;
|
|
int varflags;
|
|
char *var;
|
|
const char *val;
|
|
int patloc;
|
|
int c;
|
|
int set;
|
|
int special;
|
|
int startloc;
|
|
int varlen;
|
|
int easy;
|
|
int quotes = flag & (EXP_FULL | EXP_CASE);
|
|
|
|
varflags = *p++;
|
|
subtype = varflags & VSTYPE;
|
|
var = p;
|
|
special = 0;
|
|
if (! is_name(*p))
|
|
special = 1;
|
|
p = strchr(p, '=') + 1;
|
|
again: /* jump here after setting a variable with ${var=text} */
|
|
if (special) {
|
|
set = varisset(var, varflags & VSNUL);
|
|
val = NULL;
|
|
} else {
|
|
val = lookupvar(var);
|
|
if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
|
|
val = NULL;
|
|
set = 0;
|
|
} else
|
|
set = 1;
|
|
}
|
|
varlen = 0;
|
|
startloc = expdest - stackblock();
|
|
if (set && subtype != VSPLUS) {
|
|
/* insert the value of the variable */
|
|
if (special) {
|
|
varvalue(var, varflags & VSQUOTE, flag);
|
|
if (subtype == VSLENGTH) {
|
|
varlen = expdest - stackblock() - startloc;
|
|
STADJUST(-varlen, expdest);
|
|
}
|
|
} else {
|
|
if (subtype == VSLENGTH) {
|
|
varlen = strlen(val);
|
|
} else {
|
|
strtodest(
|
|
val,
|
|
varflags & VSQUOTE ?
|
|
DQSYNTAX : BASESYNTAX,
|
|
quotes
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (subtype == VSPLUS)
|
|
set = ! set;
|
|
|
|
easy = ((varflags & VSQUOTE) == 0 ||
|
|
(*var == '@' && shellparam.nparam != 1));
|
|
|
|
|
|
switch (subtype) {
|
|
case VSLENGTH:
|
|
expdest = cvtnum(varlen, expdest);
|
|
goto record;
|
|
|
|
case VSNORMAL:
|
|
if (!easy)
|
|
break;
|
|
record:
|
|
recordregion(startloc, expdest - stackblock(),
|
|
varflags & VSQUOTE);
|
|
break;
|
|
|
|
case VSPLUS:
|
|
case VSMINUS:
|
|
if (!set) {
|
|
argstr(p, flag);
|
|
break;
|
|
}
|
|
if (easy)
|
|
goto record;
|
|
break;
|
|
|
|
case VSTRIMLEFT:
|
|
case VSTRIMLEFTMAX:
|
|
case VSTRIMRIGHT:
|
|
case VSTRIMRIGHTMAX:
|
|
if (!set)
|
|
break;
|
|
/*
|
|
* Terminate the string and start recording the pattern
|
|
* right after it
|
|
*/
|
|
STPUTC('\0', expdest);
|
|
patloc = expdest - stackblock();
|
|
if (subevalvar(p, NULL, patloc, subtype,
|
|
startloc, varflags, quotes) == 0) {
|
|
int amount = (expdest - stackblock() - patloc) + 1;
|
|
STADJUST(-amount, expdest);
|
|
}
|
|
/* Remove any recorded regions beyond start of variable */
|
|
removerecordregions(startloc);
|
|
goto record;
|
|
|
|
case VSASSIGN:
|
|
case VSQUESTION:
|
|
if (!set) {
|
|
if (subevalvar(p, var, 0, subtype, startloc,
|
|
varflags, quotes)) {
|
|
varflags &= ~VSNUL;
|
|
/*
|
|
* Remove any recorded regions beyond
|
|
* start of variable
|
|
*/
|
|
removerecordregions(startloc);
|
|
goto again;
|
|
}
|
|
break;
|
|
}
|
|
if (easy)
|
|
goto record;
|
|
break;
|
|
|
|
#ifdef DEBUG
|
|
default:
|
|
abort();
|
|
#endif
|
|
}
|
|
|
|
if (subtype != VSNORMAL) { /* skip to end of alternative */
|
|
int nesting = 1;
|
|
for (;;) {
|
|
if ((c = *p++) == CTLESC)
|
|
p++;
|
|
else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
|
|
if (set)
|
|
argbackq = argbackq->next;
|
|
} else if (c == CTLVAR) {
|
|
if ((*p++ & VSTYPE) != VSNORMAL)
|
|
nesting++;
|
|
} else if (c == CTLENDVAR) {
|
|
if (--nesting == 0)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return p;
|
|
}
|
|
|
|
|
|
/*
|
|
* Perform variable and command substitution. If EXP_FULL is set, output CTLESC
|
|
* characters to allow for further processing. Otherwise treat
|
|
* $@ like $* since no splitting will be performed.
|
|
*/
|
|
|
|
static void
|
|
argstr(p, flag)
|
|
char *p;
|
|
int flag;
|
|
{
|
|
char c;
|
|
int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
|
|
int firsteq = 1;
|
|
|
|
if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
|
|
p = exptilde(p, flag);
|
|
for (;;) {
|
|
switch (c = *p++) {
|
|
case '\0':
|
|
case CTLENDVAR: /* ??? */
|
|
goto breakloop;
|
|
case CTLQUOTEMARK:
|
|
/* "$@" syntax adherence hack */
|
|
if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
|
|
break;
|
|
if ((flag & EXP_FULL) != 0)
|
|
STPUTC(c, expdest);
|
|
break;
|
|
case CTLESC:
|
|
if (quotes)
|
|
STPUTC(c, expdest);
|
|
c = *p++;
|
|
STPUTC(c, expdest);
|
|
break;
|
|
case CTLVAR:
|
|
p = evalvar(p, flag);
|
|
break;
|
|
case CTLBACKQ:
|
|
case CTLBACKQ|CTLQUOTE:
|
|
expbackq(argbackq->n, c & CTLQUOTE, flag);
|
|
argbackq = argbackq->next;
|
|
break;
|
|
#ifdef ASH_MATH_SUPPORT
|
|
case CTLENDARI:
|
|
expari(flag);
|
|
break;
|
|
#endif
|
|
case ':':
|
|
case '=':
|
|
/*
|
|
* sort of a hack - expand tildes in variable
|
|
* assignments (after the first '=' and after ':'s).
|
|
*/
|
|
STPUTC(c, expdest);
|
|
if (flag & EXP_VARTILDE && *p == '~') {
|
|
if (c == '=') {
|
|
if (firsteq)
|
|
firsteq = 0;
|
|
else
|
|
break;
|
|
}
|
|
p = exptilde(p, flag);
|
|
}
|
|
break;
|
|
default:
|
|
STPUTC(c, expdest);
|
|
}
|
|
}
|
|
breakloop:;
|
|
return;
|
|
}
|
|
|
|
static char *
|
|
exptilde(p, flag)
|
|
char *p;
|
|
int flag;
|
|
{
|
|
char c, *startp = p;
|
|
struct passwd *pw;
|
|
const char *home;
|
|
int quotes = flag & (EXP_FULL | EXP_CASE);
|
|
|
|
while ((c = *p) != '\0') {
|
|
switch(c) {
|
|
case CTLESC:
|
|
return (startp);
|
|
case CTLQUOTEMARK:
|
|
return (startp);
|
|
case ':':
|
|
if (flag & EXP_VARTILDE)
|
|
goto done;
|
|
break;
|
|
case '/':
|
|
goto done;
|
|
}
|
|
p++;
|
|
}
|
|
done:
|
|
*p = '\0';
|
|
if (*(startp+1) == '\0') {
|
|
if ((home = lookupvar("HOME")) == NULL)
|
|
goto lose;
|
|
} else {
|
|
if ((pw = getpwnam(startp+1)) == NULL)
|
|
goto lose;
|
|
home = pw->pw_dir;
|
|
}
|
|
if (*home == '\0')
|
|
goto lose;
|
|
*p = c;
|
|
strtodest(home, SQSYNTAX, quotes);
|
|
return (p);
|
|
lose:
|
|
*p = c;
|
|
return (startp);
|
|
}
|
|
|
|
|
|
static void
|
|
removerecordregions(int endoff)
|
|
{
|
|
if (ifslastp == NULL)
|
|
return;
|
|
|
|
if (ifsfirst.endoff > endoff) {
|
|
while (ifsfirst.next != NULL) {
|
|
struct ifsregion *ifsp;
|
|
INTOFF;
|
|
ifsp = ifsfirst.next->next;
|
|
ckfree(ifsfirst.next);
|
|
ifsfirst.next = ifsp;
|
|
INTON;
|
|
}
|
|
if (ifsfirst.begoff > endoff)
|
|
ifslastp = NULL;
|
|
else {
|
|
ifslastp = &ifsfirst;
|
|
ifsfirst.endoff = endoff;
|
|
}
|
|
return;
|
|
}
|
|
|
|
ifslastp = &ifsfirst;
|
|
while (ifslastp->next && ifslastp->next->begoff < endoff)
|
|
ifslastp=ifslastp->next;
|
|
while (ifslastp->next != NULL) {
|
|
struct ifsregion *ifsp;
|
|
INTOFF;
|
|
ifsp = ifslastp->next->next;
|
|
ckfree(ifslastp->next);
|
|
ifslastp->next = ifsp;
|
|
INTON;
|
|
}
|
|
if (ifslastp->endoff > endoff)
|
|
ifslastp->endoff = endoff;
|
|
}
|
|
|
|
|
|
#ifdef ASH_MATH_SUPPORT
|
|
/*
|
|
* Expand arithmetic expression. Backup to start of expression,
|
|
* evaluate, place result in (backed up) result, adjust string position.
|
|
*/
|
|
static void
|
|
expari(int flag)
|
|
{
|
|
char *p, *start;
|
|
int errcode;
|
|
int result;
|
|
int begoff;
|
|
int quotes = flag & (EXP_FULL | EXP_CASE);
|
|
int quoted;
|
|
|
|
/* ifsfree(); */
|
|
|
|
/*
|
|
* This routine is slightly over-complicated for
|
|
* efficiency. First we make sure there is
|
|
* enough space for the result, which may be bigger
|
|
* than the expression if we add exponentation. Next we
|
|
* scan backwards looking for the start of arithmetic. If the
|
|
* next previous character is a CTLESC character, then we
|
|
* have to rescan starting from the beginning since CTLESC
|
|
* characters have to be processed left to right.
|
|
*/
|
|
CHECKSTRSPACE(10, expdest);
|
|
USTPUTC('\0', expdest);
|
|
start = stackblock();
|
|
p = expdest - 1;
|
|
while (*p != CTLARI && p >= start)
|
|
--p;
|
|
if (*p != CTLARI)
|
|
error("missing CTLARI (shouldn't happen)");
|
|
if (p > start && *(p-1) == CTLESC)
|
|
for (p = start; *p != CTLARI; p++)
|
|
if (*p == CTLESC)
|
|
p++;
|
|
|
|
if (p[1] == '"')
|
|
quoted=1;
|
|
else
|
|
quoted=0;
|
|
begoff = p - start;
|
|
removerecordregions(begoff);
|
|
if (quotes)
|
|
rmescapes(p+2);
|
|
result = arith(p+2, &errcode);
|
|
if (errcode < 0) {
|
|
if(errcode == -2)
|
|
error("divide by zero");
|
|
else
|
|
error("syntax error: \"%s\"\n", p+2);
|
|
}
|
|
snprintf(p, 12, "%d", result);
|
|
|
|
while (*p++)
|
|
;
|
|
|
|
if (quoted == 0)
|
|
recordregion(begoff, p - 1 - start, 0);
|
|
result = expdest - p + 1;
|
|
STADJUST(-result, expdest);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Expand stuff in backwards quotes.
|
|
*/
|
|
|
|
static void
|
|
expbackq(cmd, quoted, flag)
|
|
union node *cmd;
|
|
int quoted;
|
|
int flag;
|
|
{
|
|
volatile struct backcmd in;
|
|
int i;
|
|
char buf[128];
|
|
char *p;
|
|
char *dest = expdest;
|
|
volatile struct ifsregion saveifs;
|
|
struct ifsregion *volatile savelastp;
|
|
struct nodelist *volatile saveargbackq;
|
|
char lastc;
|
|
int startloc = dest - stackblock();
|
|
int syntax = quoted ? DQSYNTAX : BASESYNTAX;
|
|
volatile int saveherefd;
|
|
int quotes = flag & (EXP_FULL | EXP_CASE);
|
|
struct jmploc jmploc;
|
|
struct jmploc *volatile savehandler;
|
|
int ex;
|
|
|
|
#if __GNUC__
|
|
/* Avoid longjmp clobbering */
|
|
(void) &dest;
|
|
(void) &syntax;
|
|
#endif
|
|
|
|
in.fd = -1;
|
|
in.buf = 0;
|
|
in.jp = 0;
|
|
|
|
INTOFF;
|
|
saveifs = ifsfirst;
|
|
savelastp = ifslastp;
|
|
saveargbackq = argbackq;
|
|
saveherefd = herefd;
|
|
herefd = -1;
|
|
if ((ex = setjmp(jmploc.loc))) {
|
|
goto err1;
|
|
}
|
|
savehandler = handler;
|
|
handler = &jmploc;
|
|
INTON;
|
|
p = grabstackstr(dest);
|
|
evalbackcmd(cmd, (struct backcmd *) &in);
|
|
ungrabstackstr(p, dest);
|
|
err1:
|
|
INTOFF;
|
|
ifsfirst = saveifs;
|
|
ifslastp = savelastp;
|
|
argbackq = saveargbackq;
|
|
herefd = saveherefd;
|
|
if (ex) {
|
|
goto err2;
|
|
}
|
|
|
|
p = in.buf;
|
|
lastc = '\0';
|
|
for (;;) {
|
|
if (--in.nleft < 0) {
|
|
if (in.fd < 0)
|
|
break;
|
|
i = safe_read(in.fd, buf, sizeof buf);
|
|
TRACE(("expbackq: read returns %d\n", i));
|
|
if (i <= 0)
|
|
break;
|
|
p = buf;
|
|
in.nleft = i - 1;
|
|
}
|
|
lastc = *p++;
|
|
if (lastc != '\0') {
|
|
if (quotes && SIT(lastc, syntax) == CCTL)
|
|
STPUTC(CTLESC, dest);
|
|
STPUTC(lastc, dest);
|
|
}
|
|
}
|
|
|
|
/* Eat all trailing newlines */
|
|
for (; dest > stackblock() && dest[-1] == '\n';)
|
|
STUNPUTC(dest);
|
|
|
|
err2:
|
|
if (in.fd >= 0)
|
|
close(in.fd);
|
|
if (in.buf)
|
|
ckfree(in.buf);
|
|
if (in.jp)
|
|
exitstatus = waitforjob(in.jp);
|
|
handler = savehandler;
|
|
if (ex) {
|
|
longjmp(handler->loc, 1);
|
|
}
|
|
if (quoted == 0)
|
|
recordregion(startloc, dest - stackblock(), 0);
|
|
TRACE(("evalbackq: size=%d: \"%.*s\"\n",
|
|
(dest - stackblock()) - startloc,
|
|
(dest - stackblock()) - startloc,
|
|
stackblock() + startloc));
|
|
expdest = dest;
|
|
INTON;
|
|
}
|
|
|
|
static int
|
|
subevalvar(p, str, strloc, subtype, startloc, varflags, quotes)
|
|
char *p;
|
|
char *str;
|
|
int strloc;
|
|
int subtype;
|
|
int startloc;
|
|
int varflags;
|
|
int quotes;
|
|
{
|
|
char *startp;
|
|
char *loc = NULL;
|
|
char *q;
|
|
int c = 0;
|
|
int saveherefd = herefd;
|
|
struct nodelist *saveargbackq = argbackq;
|
|
int amount;
|
|
|
|
herefd = -1;
|
|
argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0);
|
|
STACKSTRNUL(expdest);
|
|
herefd = saveherefd;
|
|
argbackq = saveargbackq;
|
|
startp = stackblock() + startloc;
|
|
if (str == NULL)
|
|
str = stackblock() + strloc;
|
|
|
|
switch (subtype) {
|
|
case VSASSIGN:
|
|
setvar(str, startp, 0);
|
|
amount = startp - expdest;
|
|
STADJUST(amount, expdest);
|
|
varflags &= ~VSNUL;
|
|
if (c != 0)
|
|
*loc = c;
|
|
return 1;
|
|
|
|
case VSQUESTION:
|
|
if (*p != CTLENDVAR) {
|
|
out2fmt(snlfmt, startp);
|
|
error((char *)NULL);
|
|
}
|
|
error("%.*s: parameter %snot set", p - str - 1,
|
|
str, (varflags & VSNUL) ? "null or "
|
|
: nullstr);
|
|
/* NOTREACHED */
|
|
|
|
case VSTRIMLEFT:
|
|
for (loc = startp; loc < str; loc++) {
|
|
c = *loc;
|
|
*loc = '\0';
|
|
if (patmatch2(str, startp, quotes))
|
|
goto recordleft;
|
|
*loc = c;
|
|
if (quotes && *loc == CTLESC)
|
|
loc++;
|
|
}
|
|
return 0;
|
|
|
|
case VSTRIMLEFTMAX:
|
|
for (loc = str - 1; loc >= startp;) {
|
|
c = *loc;
|
|
*loc = '\0';
|
|
if (patmatch2(str, startp, quotes))
|
|
goto recordleft;
|
|
*loc = c;
|
|
loc--;
|
|
if (quotes && loc > startp && *(loc - 1) == CTLESC) {
|
|
for (q = startp; q < loc; q++)
|
|
if (*q == CTLESC)
|
|
q++;
|
|
if (q > loc)
|
|
loc--;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
case VSTRIMRIGHT:
|
|
for (loc = str - 1; loc >= startp;) {
|
|
if (patmatch2(str, loc, quotes))
|
|
goto recordright;
|
|
loc--;
|
|
if (quotes && loc > startp && *(loc - 1) == CTLESC) {
|
|
for (q = startp; q < loc; q++)
|
|
if (*q == CTLESC)
|
|
q++;
|
|
if (q > loc)
|
|
loc--;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
case VSTRIMRIGHTMAX:
|
|
for (loc = startp; loc < str - 1; loc++) {
|
|
if (patmatch2(str, loc, quotes))
|
|
goto recordright;
|
|
if (quotes && *loc == CTLESC)
|
|
loc++;
|
|
}
|
|
return 0;
|
|
|
|
#ifdef DEBUG
|
|
default:
|
|
abort();
|
|
#endif
|
|
}
|
|
|
|
recordleft:
|
|
*loc = c;
|
|
amount = ((str - 1) - (loc - startp)) - expdest;
|
|
STADJUST(amount, expdest);
|
|
while (loc != str - 1)
|
|
*startp++ = *loc++;
|
|
return 1;
|
|
|
|
recordright:
|
|
amount = loc - expdest;
|
|
STADJUST(amount, expdest);
|
|
STPUTC('\0', expdest);
|
|
STADJUST(-1, expdest);
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Test whether a specialized variable is set.
|
|
*/
|
|
|
|
static int
|
|
varisset(name, nulok)
|
|
char *name;
|
|
int nulok;
|
|
{
|
|
if (*name == '!')
|
|
return backgndpid != -1;
|
|
else if (*name == '@' || *name == '*') {
|
|
if (*shellparam.p == NULL)
|
|
return 0;
|
|
|
|
if (nulok) {
|
|
char **av;
|
|
|
|
for (av = shellparam.p; *av; av++)
|
|
if (**av != '\0')
|
|
return 1;
|
|
return 0;
|
|
}
|
|
} else if (is_digit(*name)) {
|
|
char *ap;
|
|
int num = atoi(name);
|
|
|
|
if (num > shellparam.nparam)
|
|
return 0;
|
|
|
|
if (num == 0)
|
|
ap = arg0;
|
|
else
|
|
ap = shellparam.p[num - 1];
|
|
|
|
if (nulok && (ap == NULL || *ap == '\0'))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Put a string on the stack.
|
|
*/
|
|
|
|
static void
|
|
strtodest(const char *p, int syntax, int quotes)
|
|
{
|
|
while (*p) {
|
|
if (quotes && SIT(*p,syntax) == CCTL)
|
|
STPUTC(CTLESC, expdest);
|
|
STPUTC(*p++, expdest);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add the value of a specialized variable to the stack string.
|
|
*/
|
|
|
|
static void
|
|
varvalue(char *name, int quoted, int flags)
|
|
{
|
|
int num;
|
|
char *p;
|
|
int i;
|
|
int sep;
|
|
int sepq = 0;
|
|
char **ap;
|
|
int syntax;
|
|
int allow_split = flags & EXP_FULL;
|
|
int quotes = flags & (EXP_FULL | EXP_CASE);
|
|
|
|
syntax = quoted ? DQSYNTAX : BASESYNTAX;
|
|
switch (*name) {
|
|
case '$':
|
|
num = rootpid;
|
|
goto numvar;
|
|
case '?':
|
|
num = oexitstatus;
|
|
goto numvar;
|
|
case '#':
|
|
num = shellparam.nparam;
|
|
goto numvar;
|
|
case '!':
|
|
num = backgndpid;
|
|
numvar:
|
|
expdest = cvtnum(num, expdest);
|
|
break;
|
|
case '-':
|
|
for (i = 0 ; i < NOPTS ; i++) {
|
|
if (optent_val(i))
|
|
STPUTC(optent_letter(optlist[i]), expdest);
|
|
}
|
|
break;
|
|
case '@':
|
|
if (allow_split && quoted) {
|
|
sep = 1 << CHAR_BIT;
|
|
goto param;
|
|
}
|
|
/* fall through */
|
|
case '*':
|
|
sep = ifsset() ? ifsval()[0] : ' ';
|
|
if (quotes) {
|
|
sepq = SIT(sep,syntax) == CCTL;
|
|
}
|
|
param:
|
|
for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
|
|
strtodest(p, syntax, quotes);
|
|
if (*ap && sep) {
|
|
if (sepq)
|
|
STPUTC(CTLESC, expdest);
|
|
STPUTC(sep, expdest);
|
|
}
|
|
}
|
|
break;
|
|
case '0':
|
|
strtodest(arg0, syntax, quotes);
|
|
break;
|
|
default:
|
|
num = atoi(name);
|
|
if (num > 0 && num <= shellparam.nparam) {
|
|
strtodest(shellparam.p[num - 1], syntax, quotes);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Record the fact that we have to scan this region of the
|
|
* string for IFS characters.
|
|
*/
|
|
|
|
static void
|
|
recordregion(start, end, nulonly)
|
|
int start;
|
|
int end;
|
|
int nulonly;
|
|
{
|
|
struct ifsregion *ifsp;
|
|
|
|
if (ifslastp == NULL) {
|
|
ifsp = &ifsfirst;
|
|
} else {
|
|
INTOFF;
|
|
ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
|
|
ifsp->next = NULL;
|
|
ifslastp->next = ifsp;
|
|
INTON;
|
|
}
|
|
ifslastp = ifsp;
|
|
ifslastp->begoff = start;
|
|
ifslastp->endoff = end;
|
|
ifslastp->nulonly = nulonly;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Break the argument string into pieces based upon IFS and add the
|
|
* strings to the argument list. The regions of the string to be
|
|
* searched for IFS characters have been stored by recordregion.
|
|
*/
|
|
static void
|
|
ifsbreakup(string, arglist)
|
|
char *string;
|
|
struct arglist *arglist;
|
|
{
|
|
struct ifsregion *ifsp;
|
|
struct strlist *sp;
|
|
char *start;
|
|
char *p;
|
|
char *q;
|
|
const char *ifs, *realifs;
|
|
int ifsspc;
|
|
int nulonly;
|
|
|
|
|
|
start = string;
|
|
ifsspc = 0;
|
|
nulonly = 0;
|
|
realifs = ifsset() ? ifsval() : defifs;
|
|
if (ifslastp != NULL) {
|
|
ifsp = &ifsfirst;
|
|
do {
|
|
p = string + ifsp->begoff;
|
|
nulonly = ifsp->nulonly;
|
|
ifs = nulonly ? nullstr : realifs;
|
|
ifsspc = 0;
|
|
while (p < string + ifsp->endoff) {
|
|
q = p;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (strchr(ifs, *p)) {
|
|
if (!nulonly)
|
|
ifsspc = (strchr(defifs, *p) != NULL);
|
|
/* Ignore IFS whitespace at start */
|
|
if (q == start && ifsspc) {
|
|
p++;
|
|
start = p;
|
|
continue;
|
|
}
|
|
*q = '\0';
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
p++;
|
|
if (!nulonly) {
|
|
for (;;) {
|
|
if (p >= string + ifsp->endoff) {
|
|
break;
|
|
}
|
|
q = p;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (strchr(ifs, *p) == NULL ) {
|
|
p = q;
|
|
break;
|
|
} else if (strchr(defifs, *p) == NULL) {
|
|
if (ifsspc) {
|
|
p++;
|
|
ifsspc = 0;
|
|
} else {
|
|
p = q;
|
|
break;
|
|
}
|
|
} else
|
|
p++;
|
|
}
|
|
}
|
|
start = p;
|
|
} else
|
|
p++;
|
|
}
|
|
} while ((ifsp = ifsp->next) != NULL);
|
|
if (!(*start || (!ifsspc && start > string && nulonly))) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = start;
|
|
*arglist->lastp = sp;
|
|
arglist->lastp = &sp->next;
|
|
}
|
|
|
|
static void
|
|
ifsfree()
|
|
{
|
|
while (ifsfirst.next != NULL) {
|
|
struct ifsregion *ifsp;
|
|
INTOFF;
|
|
ifsp = ifsfirst.next->next;
|
|
ckfree(ifsfirst.next);
|
|
ifsfirst.next = ifsp;
|
|
INTON;
|
|
}
|
|
ifslastp = NULL;
|
|
ifsfirst.next = NULL;
|
|
}
|
|
|
|
/*
|
|
* Add a file name to the list.
|
|
*/
|
|
|
|
static void
|
|
addfname(const char *name)
|
|
{
|
|
char *p;
|
|
struct strlist *sp;
|
|
|
|
p = sstrdup(name);
|
|
sp = (struct strlist *)stalloc(sizeof *sp);
|
|
sp->text = p;
|
|
*exparg.lastp = sp;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
|
|
/*
|
|
* Expand shell metacharacters. At this point, the only control characters
|
|
* should be escapes. The results are stored in the list exparg.
|
|
*/
|
|
|
|
#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN)
|
|
static void
|
|
expandmeta(str, flag)
|
|
struct strlist *str;
|
|
int flag;
|
|
{
|
|
const char *p;
|
|
glob_t pglob;
|
|
/* TODO - EXP_REDIR */
|
|
|
|
while (str) {
|
|
if (fflag)
|
|
goto nometa;
|
|
p = preglob(str->text);
|
|
INTOFF;
|
|
switch (glob(p, 0, 0, &pglob)) {
|
|
case 0:
|
|
if(pglob.gl_pathv[1]==0 && !strcmp(p, pglob.gl_pathv[0]))
|
|
goto nometa2;
|
|
addglob(&pglob);
|
|
globfree(&pglob);
|
|
INTON;
|
|
break;
|
|
case GLOB_NOMATCH:
|
|
nometa2:
|
|
globfree(&pglob);
|
|
INTON;
|
|
nometa:
|
|
*exparg.lastp = str;
|
|
rmescapes(str->text);
|
|
exparg.lastp = &str->next;
|
|
break;
|
|
default: /* GLOB_NOSPACE */
|
|
error("Out of space");
|
|
}
|
|
str = str->next;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Add the result of glob(3) to the list.
|
|
*/
|
|
|
|
static void
|
|
addglob(pglob)
|
|
const glob_t *pglob;
|
|
{
|
|
char **p = pglob->gl_pathv;
|
|
|
|
do {
|
|
addfname(*p);
|
|
} while (*++p);
|
|
}
|
|
|
|
|
|
#else /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
|
|
static char *expdir;
|
|
|
|
|
|
static void
|
|
expandmeta(str, flag)
|
|
struct strlist *str;
|
|
int flag;
|
|
{
|
|
char *p;
|
|
struct strlist **savelastp;
|
|
struct strlist *sp;
|
|
char c;
|
|
/* TODO - EXP_REDIR */
|
|
|
|
while (str) {
|
|
if (fflag)
|
|
goto nometa;
|
|
p = str->text;
|
|
for (;;) { /* fast check for meta chars */
|
|
if ((c = *p++) == '\0')
|
|
goto nometa;
|
|
if (c == '*' || c == '?' || c == '[' || c == '!')
|
|
break;
|
|
}
|
|
savelastp = exparg.lastp;
|
|
INTOFF;
|
|
if (expdir == NULL) {
|
|
int i = strlen(str->text);
|
|
expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
|
|
}
|
|
|
|
expmeta(expdir, str->text);
|
|
ckfree(expdir);
|
|
expdir = NULL;
|
|
INTON;
|
|
if (exparg.lastp == savelastp) {
|
|
/*
|
|
* no matches
|
|
*/
|
|
nometa:
|
|
*exparg.lastp = str;
|
|
rmescapes(str->text);
|
|
exparg.lastp = &str->next;
|
|
} else {
|
|
*exparg.lastp = NULL;
|
|
*savelastp = sp = expsort(*savelastp);
|
|
while (sp->next != NULL)
|
|
sp = sp->next;
|
|
exparg.lastp = &sp->next;
|
|
}
|
|
str = str->next;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Do metacharacter (i.e. *, ?, [...]) expansion.
|
|
*/
|
|
|
|
static void
|
|
expmeta(enddir, name)
|
|
char *enddir;
|
|
char *name;
|
|
{
|
|
char *p;
|
|
const char *cp;
|
|
char *q;
|
|
char *start;
|
|
char *endname;
|
|
int metaflag;
|
|
struct stat statb;
|
|
DIR *dirp;
|
|
struct dirent *dp;
|
|
int atend;
|
|
int matchdot;
|
|
|
|
metaflag = 0;
|
|
start = name;
|
|
for (p = name ; ; p++) {
|
|
if (*p == '*' || *p == '?')
|
|
metaflag = 1;
|
|
else if (*p == '[') {
|
|
q = p + 1;
|
|
if (*q == '!')
|
|
q++;
|
|
for (;;) {
|
|
while (*q == CTLQUOTEMARK)
|
|
q++;
|
|
if (*q == CTLESC)
|
|
q++;
|
|
if (*q == '/' || *q == '\0')
|
|
break;
|
|
if (*++q == ']') {
|
|
metaflag = 1;
|
|
break;
|
|
}
|
|
}
|
|
} else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) {
|
|
metaflag = 1;
|
|
} else if (*p == '\0')
|
|
break;
|
|
else if (*p == CTLQUOTEMARK)
|
|
continue;
|
|
else if (*p == CTLESC)
|
|
p++;
|
|
if (*p == '/') {
|
|
if (metaflag)
|
|
break;
|
|
start = p + 1;
|
|
}
|
|
}
|
|
if (metaflag == 0) { /* we've reached the end of the file name */
|
|
if (enddir != expdir)
|
|
metaflag++;
|
|
for (p = name ; ; p++) {
|
|
if (*p == CTLQUOTEMARK)
|
|
continue;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
*enddir++ = *p;
|
|
if (*p == '\0')
|
|
break;
|
|
}
|
|
if (metaflag == 0 || lstat(expdir, &statb) >= 0)
|
|
addfname(expdir);
|
|
return;
|
|
}
|
|
endname = p;
|
|
if (start != name) {
|
|
p = name;
|
|
while (p < start) {
|
|
while (*p == CTLQUOTEMARK)
|
|
p++;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
*enddir++ = *p++;
|
|
}
|
|
}
|
|
if (enddir == expdir) {
|
|
cp = ".";
|
|
} else if (enddir == expdir + 1 && *expdir == '/') {
|
|
cp = "/";
|
|
} else {
|
|
cp = expdir;
|
|
enddir[-1] = '\0';
|
|
}
|
|
if ((dirp = opendir(cp)) == NULL)
|
|
return;
|
|
if (enddir != expdir)
|
|
enddir[-1] = '/';
|
|
if (*endname == 0) {
|
|
atend = 1;
|
|
} else {
|
|
atend = 0;
|
|
*endname++ = '\0';
|
|
}
|
|
matchdot = 0;
|
|
p = start;
|
|
while (*p == CTLQUOTEMARK)
|
|
p++;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (*p == '.')
|
|
matchdot++;
|
|
while (! int_pending() && (dp = readdir(dirp)) != NULL) {
|
|
if (dp->d_name[0] == '.' && ! matchdot)
|
|
continue;
|
|
if (patmatch(start, dp->d_name, 0)) {
|
|
if (atend) {
|
|
strcpy(enddir, dp->d_name);
|
|
addfname(expdir);
|
|
} else {
|
|
for (p = enddir, cp = dp->d_name;
|
|
(*p++ = *cp++) != '\0';)
|
|
continue;
|
|
p[-1] = '/';
|
|
expmeta(p, endname);
|
|
}
|
|
}
|
|
}
|
|
closedir(dirp);
|
|
if (! atend)
|
|
endname[-1] = '/';
|
|
}
|
|
#endif /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
|
|
|
|
|
|
|
|
#if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
|
|
/*
|
|
* Sort the results of file name expansion. It calculates the number of
|
|
* strings to sort and then calls msort (short for merge sort) to do the
|
|
* work.
|
|
*/
|
|
|
|
static struct strlist *
|
|
expsort(str)
|
|
struct strlist *str;
|
|
{
|
|
int len;
|
|
struct strlist *sp;
|
|
|
|
len = 0;
|
|
for (sp = str ; sp ; sp = sp->next)
|
|
len++;
|
|
return msort(str, len);
|
|
}
|
|
|
|
|
|
static struct strlist *
|
|
msort(list, len)
|
|
struct strlist *list;
|
|
int len;
|
|
{
|
|
struct strlist *p, *q = NULL;
|
|
struct strlist **lpp;
|
|
int half;
|
|
int n;
|
|
|
|
if (len <= 1)
|
|
return list;
|
|
half = len >> 1;
|
|
p = list;
|
|
for (n = half ; --n >= 0 ; ) {
|
|
q = p;
|
|
p = p->next;
|
|
}
|
|
q->next = NULL; /* terminate first half of list */
|
|
q = msort(list, half); /* sort first half of list */
|
|
p = msort(p, len - half); /* sort second half */
|
|
lpp = &list;
|
|
for (;;) {
|
|
if (strcmp(p->text, q->text) < 0) {
|
|
*lpp = p;
|
|
lpp = &p->next;
|
|
if ((p = *lpp) == NULL) {
|
|
*lpp = q;
|
|
break;
|
|
}
|
|
} else {
|
|
*lpp = q;
|
|
lpp = &q->next;
|
|
if ((q = *lpp) == NULL) {
|
|
*lpp = p;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return list;
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
* Returns true if the pattern matches the string.
|
|
*/
|
|
|
|
#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
|
|
/* squoted: string might have quote chars */
|
|
static int
|
|
patmatch(char *pattern, char *string, int squoted)
|
|
{
|
|
const char *p;
|
|
char *q;
|
|
|
|
p = preglob(pattern);
|
|
q = squoted ? _rmescapes(string, RMESCAPE_ALLOC) : string;
|
|
|
|
return !fnmatch(p, q, 0);
|
|
}
|
|
|
|
|
|
static int
|
|
patmatch2(char *pattern, char *string, int squoted)
|
|
{
|
|
char *p;
|
|
int res;
|
|
|
|
sstrnleft--;
|
|
p = grabstackstr(expdest);
|
|
res = patmatch(pattern, string, squoted);
|
|
ungrabstackstr(p, expdest);
|
|
return res;
|
|
}
|
|
#else
|
|
static int
|
|
patmatch(char *pattern, char *string, int squoted) {
|
|
return pmatch(pattern, string, squoted);
|
|
}
|
|
|
|
|
|
static int
|
|
pmatch(char *pattern, char *string, int squoted)
|
|
{
|
|
char *p, *q;
|
|
char c;
|
|
|
|
p = pattern;
|
|
q = string;
|
|
for (;;) {
|
|
switch (c = *p++) {
|
|
case '\0':
|
|
goto breakloop;
|
|
case CTLESC:
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
if (*q++ != *p++)
|
|
return 0;
|
|
break;
|
|
case CTLQUOTEMARK:
|
|
continue;
|
|
case '?':
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
if (*q++ == '\0')
|
|
return 0;
|
|
break;
|
|
case '*':
|
|
c = *p;
|
|
while (c == CTLQUOTEMARK || c == '*')
|
|
c = *++p;
|
|
if (c != CTLESC && c != CTLQUOTEMARK &&
|
|
c != '?' && c != '*' && c != '[') {
|
|
while (*q != c) {
|
|
if (squoted && *q == CTLESC &&
|
|
q[1] == c)
|
|
break;
|
|
if (*q == '\0')
|
|
return 0;
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
q++;
|
|
}
|
|
}
|
|
do {
|
|
if (pmatch(p, q, squoted))
|
|
return 1;
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
} while (*q++ != '\0');
|
|
return 0;
|
|
case '[': {
|
|
char *endp;
|
|
int invert, found;
|
|
char chr;
|
|
|
|
endp = p;
|
|
if (*endp == '!')
|
|
endp++;
|
|
for (;;) {
|
|
while (*endp == CTLQUOTEMARK)
|
|
endp++;
|
|
if (*endp == '\0')
|
|
goto dft; /* no matching ] */
|
|
if (*endp == CTLESC)
|
|
endp++;
|
|
if (*++endp == ']')
|
|
break;
|
|
}
|
|
invert = 0;
|
|
if (*p == '!') {
|
|
invert++;
|
|
p++;
|
|
}
|
|
found = 0;
|
|
chr = *q++;
|
|
if (squoted && chr == CTLESC)
|
|
chr = *q++;
|
|
if (chr == '\0')
|
|
return 0;
|
|
c = *p++;
|
|
do {
|
|
if (c == CTLQUOTEMARK)
|
|
continue;
|
|
if (c == CTLESC)
|
|
c = *p++;
|
|
if (*p == '-' && p[1] != ']') {
|
|
p++;
|
|
while (*p == CTLQUOTEMARK)
|
|
p++;
|
|
if (*p == CTLESC)
|
|
p++;
|
|
if (chr >= c && chr <= *p)
|
|
found = 1;
|
|
p++;
|
|
} else {
|
|
if (chr == c)
|
|
found = 1;
|
|
}
|
|
} while ((c = *p++) != ']');
|
|
if (found == invert)
|
|
return 0;
|
|
break;
|
|
}
|
|
dft: default:
|
|
if (squoted && *q == CTLESC)
|
|
q++;
|
|
if (*q++ != c)
|
|
return 0;
|
|
break;
|
|
}
|
|
}
|
|
breakloop:
|
|
if (*q != '\0')
|
|
return 0;
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
* Remove any CTLESC characters from a string.
|
|
*/
|
|
|
|
#if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
|
|
static char *
|
|
_rmescapes(char *str, int flag)
|
|
{
|
|
char *p, *q, *r;
|
|
static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 };
|
|
|
|
p = strpbrk(str, qchars);
|
|
if (!p) {
|
|
return str;
|
|
}
|
|
q = p;
|
|
r = str;
|
|
if (flag & RMESCAPE_ALLOC) {
|
|
size_t len = p - str;
|
|
q = r = stalloc(strlen(p) + len + 1);
|
|
if (len > 0) {
|
|
memcpy(q, str, len);
|
|
q += len;
|
|
}
|
|
}
|
|
while (*p) {
|
|
if (*p == CTLQUOTEMARK) {
|
|
p++;
|
|
continue;
|
|
}
|
|
if (*p == CTLESC) {
|
|
p++;
|
|
if (flag & RMESCAPE_GLOB && *p != '/') {
|
|
*q++ = '\\';
|
|
}
|
|
}
|
|
*q++ = *p++;
|
|
}
|
|
*q = '\0';
|
|
return r;
|
|
}
|
|
#else
|
|
static void
|
|
rmescapes(str)
|
|
char *str;
|
|
{
|
|
char *p, *q;
|
|
|
|
p = str;
|
|
while (*p != CTLESC && *p != CTLQUOTEMARK) {
|
|
if (*p++ == '\0')
|
|
return;
|
|
}
|
|
q = p;
|
|
while (*p) {
|
|
if (*p == CTLQUOTEMARK) {
|
|
p++;
|
|
continue;
|
|
}
|
|
if (*p == CTLESC)
|
|
p++;
|
|
*q++ = *p++;
|
|
}
|
|
*q = '\0';
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
* See if a pattern matches in a case statement.
|
|
*/
|
|
|
|
static int
|
|
casematch(union node *pattern, const char *val)
|
|
{
|
|
struct stackmark smark;
|
|
int result;
|
|
char *p;
|
|
|
|
setstackmark(&smark);
|
|
argbackq = pattern->narg.backquote;
|
|
STARTSTACKSTR(expdest);
|
|
ifslastp = NULL;
|
|
argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
|
|
STPUTC('\0', expdest);
|
|
p = grabstackstr(expdest);
|
|
result = patmatch(p, (char *)val, 0);
|
|
popstackmark(&smark);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Our own itoa().
|
|
*/
|
|
|
|
static char *
|
|
cvtnum(num, buf)
|
|
int num;
|
|
char *buf;
|
|
{
|
|
int len;
|
|
|
|
CHECKSTRSPACE(32, buf);
|
|
len = sprintf(buf, "%d", num);
|
|
STADJUST(len, buf);
|
|
return buf;
|
|
}
|
|
/*
|
|
* Editline and history functions (and glue).
|
|
*/
|
|
static int histcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
error("not compiled with history support");
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
struct redirtab {
|
|
struct redirtab *next;
|
|
short renamed[10]; /* Current ash support only 0-9 descriptors */
|
|
/* char on arm (and others) can't be negative */
|
|
};
|
|
|
|
static struct redirtab *redirlist;
|
|
|
|
extern char **environ;
|
|
|
|
|
|
|
|
/*
|
|
* Initialization code.
|
|
*/
|
|
|
|
static void
|
|
init(void) {
|
|
|
|
/* from cd.c: */
|
|
{
|
|
setpwd(0, 0);
|
|
}
|
|
|
|
/* from input.c: */
|
|
{
|
|
basepf.nextc = basepf.buf = basebuf;
|
|
}
|
|
|
|
/* from var.c: */
|
|
{
|
|
char **envp;
|
|
char ppid[32];
|
|
|
|
initvar();
|
|
for (envp = environ ; *envp ; envp++) {
|
|
if (strchr(*envp, '=')) {
|
|
setvareq(*envp, VEXPORT|VTEXTFIXED);
|
|
}
|
|
}
|
|
|
|
snprintf(ppid, sizeof(ppid), "%d", (int) getppid());
|
|
setvar("PPID", ppid, 0);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* This routine is called when an error or an interrupt occurs in an
|
|
* interactive shell and control is returned to the main command loop.
|
|
*/
|
|
|
|
/* 1 == check for aliases, 2 == also check for assignments */
|
|
static int checkalias; /* also used in no alias mode for check assignments */
|
|
|
|
static void
|
|
reset(void) {
|
|
|
|
/* from eval.c: */
|
|
{
|
|
evalskip = 0;
|
|
loopnest = 0;
|
|
funcnest = 0;
|
|
}
|
|
|
|
/* from input.c: */
|
|
{
|
|
if (exception != EXSHELLPROC)
|
|
parselleft = parsenleft = 0; /* clear input buffer */
|
|
popallfiles();
|
|
}
|
|
|
|
/* from parser.c: */
|
|
{
|
|
tokpushback = 0;
|
|
checkkwd = 0;
|
|
checkalias = 0;
|
|
}
|
|
|
|
/* from redir.c: */
|
|
{
|
|
while (redirlist)
|
|
popredir();
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* This file implements the input routines used by the parser.
|
|
*/
|
|
|
|
#ifdef BB_FEATURE_COMMAND_EDITING
|
|
static const char * cmdedit_prompt;
|
|
static inline void putprompt(const char *s) {
|
|
cmdedit_prompt = s;
|
|
}
|
|
#else
|
|
static inline void putprompt(const char *s) {
|
|
out2str(s);
|
|
}
|
|
#endif
|
|
|
|
#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
|
|
|
|
|
|
|
|
/*
|
|
* Same as pgetc(), but ignores PEOA.
|
|
*/
|
|
|
|
#ifdef ASH_ALIAS
|
|
static int
|
|
pgetc2(void)
|
|
{
|
|
int c;
|
|
do {
|
|
c = pgetc_macro();
|
|
} while (c == PEOA);
|
|
return c;
|
|
}
|
|
#else
|
|
static inline int pgetc2() { return pgetc_macro(); }
|
|
#endif
|
|
|
|
/*
|
|
* Read a line from the script.
|
|
*/
|
|
|
|
static inline char *
|
|
pfgets(char *line, int len)
|
|
{
|
|
char *p = line;
|
|
int nleft = len;
|
|
int c;
|
|
|
|
while (--nleft > 0) {
|
|
c = pgetc2();
|
|
if (c == PEOF) {
|
|
if (p == line)
|
|
return NULL;
|
|
break;
|
|
}
|
|
*p++ = c;
|
|
if (c == '\n')
|
|
break;
|
|
}
|
|
*p = '\0';
|
|
return line;
|
|
}
|
|
|
|
static inline int
|
|
preadfd(void)
|
|
{
|
|
int nr;
|
|
char *buf = parsefile->buf;
|
|
parsenextc = buf;
|
|
|
|
retry:
|
|
#ifdef BB_FEATURE_COMMAND_EDITING
|
|
{
|
|
if (!iflag || parsefile->fd)
|
|
nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
|
|
else {
|
|
nr = cmdedit_read_input((char*)cmdedit_prompt, buf);
|
|
}
|
|
}
|
|
#else
|
|
nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
|
|
#endif
|
|
|
|
if (nr < 0) {
|
|
if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
|
|
int flags = fcntl(0, F_GETFL, 0);
|
|
if (flags >= 0 && flags & O_NONBLOCK) {
|
|
flags &=~ O_NONBLOCK;
|
|
if (fcntl(0, F_SETFL, flags) >= 0) {
|
|
out2str("sh: turning off NDELAY mode\n");
|
|
goto retry;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return nr;
|
|
}
|
|
|
|
static void
|
|
popstring(void)
|
|
{
|
|
struct strpush *sp = parsefile->strpush;
|
|
|
|
INTOFF;
|
|
#ifdef ASH_ALIAS
|
|
if (sp->ap) {
|
|
if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
|
|
if (!checkalias) {
|
|
checkalias = 1;
|
|
}
|
|
}
|
|
if (sp->string != sp->ap->val) {
|
|
ckfree(sp->string);
|
|
}
|
|
|
|
sp->ap->flag &= ~ALIASINUSE;
|
|
if (sp->ap->flag & ALIASDEAD) {
|
|
unalias(sp->ap->name);
|
|
}
|
|
}
|
|
#endif
|
|
parsenextc = sp->prevstring;
|
|
parsenleft = sp->prevnleft;
|
|
/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
|
|
parsefile->strpush = sp->prev;
|
|
if (sp != &(parsefile->basestrpush))
|
|
ckfree(sp);
|
|
INTON;
|
|
}
|
|
|
|
|
|
/*
|
|
* Refill the input buffer and return the next input character:
|
|
*
|
|
* 1) If a string was pushed back on the input, pop it;
|
|
* 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
|
|
* from a string so we can't refill the buffer, return EOF.
|
|
* 3) If the is more stuff in this buffer, use it else call read to fill it.
|
|
* 4) Process input up to the next newline, deleting nul characters.
|
|
*/
|
|
|
|
static int
|
|
preadbuffer(void)
|
|
{
|
|
char *p, *q;
|
|
int more;
|
|
char savec;
|
|
|
|
while (parsefile->strpush) {
|
|
#ifdef ASH_ALIAS
|
|
if (parsenleft == -1 && parsefile->strpush->ap &&
|
|
parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
|
|
return PEOA;
|
|
}
|
|
#endif
|
|
popstring();
|
|
if (--parsenleft >= 0)
|
|
return (*parsenextc++);
|
|
}
|
|
if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
|
|
return PEOF;
|
|
flushall();
|
|
|
|
again:
|
|
if (parselleft <= 0) {
|
|
if ((parselleft = preadfd()) <= 0) {
|
|
parselleft = parsenleft = EOF_NLEFT;
|
|
return PEOF;
|
|
}
|
|
}
|
|
|
|
q = p = parsenextc;
|
|
|
|
/* delete nul characters */
|
|
for (more = 1; more;) {
|
|
switch (*p) {
|
|
case '\0':
|
|
p++; /* Skip nul */
|
|
goto check;
|
|
|
|
|
|
case '\n':
|
|
parsenleft = q - parsenextc;
|
|
more = 0; /* Stop processing here */
|
|
break;
|
|
}
|
|
|
|
*q++ = *p++;
|
|
check:
|
|
if (--parselleft <= 0 && more) {
|
|
parsenleft = q - parsenextc - 1;
|
|
if (parsenleft < 0)
|
|
goto again;
|
|
more = 0;
|
|
}
|
|
}
|
|
|
|
savec = *q;
|
|
*q = '\0';
|
|
|
|
if (vflag) {
|
|
out2str(parsenextc);
|
|
}
|
|
|
|
*q = savec;
|
|
|
|
return *parsenextc++;
|
|
}
|
|
|
|
|
|
/*
|
|
* Push a string back onto the input at this current parsefile level.
|
|
* We handle aliases this way.
|
|
*/
|
|
static void
|
|
pushstring(char *s, int len, void *ap)
|
|
{
|
|
struct strpush *sp;
|
|
|
|
INTOFF;
|
|
/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
|
|
if (parsefile->strpush) {
|
|
sp = ckmalloc(sizeof (struct strpush));
|
|
sp->prev = parsefile->strpush;
|
|
parsefile->strpush = sp;
|
|
} else
|
|
sp = parsefile->strpush = &(parsefile->basestrpush);
|
|
sp->prevstring = parsenextc;
|
|
sp->prevnleft = parsenleft;
|
|
#ifdef ASH_ALIAS
|
|
sp->ap = (struct alias *)ap;
|
|
if (ap) {
|
|
((struct alias *)ap)->flag |= ALIASINUSE;
|
|
sp->string = s;
|
|
}
|
|
#endif
|
|
parsenextc = s;
|
|
parsenleft = len;
|
|
INTON;
|
|
}
|
|
|
|
|
|
/*
|
|
* Like setinputfile, but takes input from a string.
|
|
*/
|
|
|
|
static void
|
|
setinputstring(char *string)
|
|
{
|
|
INTOFF;
|
|
pushfile();
|
|
parsenextc = string;
|
|
parsenleft = strlen(string);
|
|
parsefile->buf = NULL;
|
|
plinno = 1;
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* To handle the "." command, a stack of input files is used. Pushfile
|
|
* adds a new entry to the stack and popfile restores the previous level.
|
|
*/
|
|
|
|
static void
|
|
pushfile(void) {
|
|
struct parsefile *pf;
|
|
|
|
parsefile->nleft = parsenleft;
|
|
parsefile->lleft = parselleft;
|
|
parsefile->nextc = parsenextc;
|
|
parsefile->linno = plinno;
|
|
pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
|
|
pf->prev = parsefile;
|
|
pf->fd = -1;
|
|
pf->strpush = NULL;
|
|
pf->basestrpush.prev = NULL;
|
|
parsefile = pf;
|
|
}
|
|
|
|
#ifdef JOBS
|
|
static void restartjob (struct job *);
|
|
#endif
|
|
static void freejob (struct job *);
|
|
static struct job *getjob (const char *);
|
|
static int dowait (int, struct job *);
|
|
static void waitonint(int);
|
|
|
|
|
|
/*
|
|
* We keep track of whether or not fd0 has been redirected. This is for
|
|
* background commands, where we want to redirect fd0 to /dev/null only
|
|
* if it hasn't already been redirected.
|
|
*/
|
|
static int fd0_redirected = 0;
|
|
|
|
/* Return true if fd 0 has already been redirected at least once. */
|
|
static inline int
|
|
fd0_redirected_p (void)
|
|
{
|
|
return fd0_redirected != 0;
|
|
}
|
|
|
|
static void dupredirect (const union node *, int, int fd1dup);
|
|
|
|
#ifdef JOBS
|
|
/*
|
|
* Turn job control on and off.
|
|
*
|
|
* Note: This code assumes that the third arg to ioctl is a character
|
|
* pointer, which is true on Berkeley systems but not System V. Since
|
|
* System V doesn't have job control yet, this isn't a problem now.
|
|
*/
|
|
|
|
|
|
|
|
static void setjobctl(int enable)
|
|
{
|
|
#ifdef OLD_TTY_DRIVER
|
|
int ldisc;
|
|
#endif
|
|
|
|
if (enable == jobctl || rootshell == 0)
|
|
return;
|
|
if (enable) {
|
|
do { /* while we are in the background */
|
|
#ifdef OLD_TTY_DRIVER
|
|
if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) {
|
|
#else
|
|
initialpgrp = tcgetpgrp(2);
|
|
if (initialpgrp < 0) {
|
|
#endif
|
|
out2str("sh: can't access tty; job control turned off\n");
|
|
mflag = 0;
|
|
return;
|
|
}
|
|
if (initialpgrp == -1)
|
|
initialpgrp = getpgrp();
|
|
else if (initialpgrp != getpgrp()) {
|
|
killpg(initialpgrp, SIGTTIN);
|
|
continue;
|
|
}
|
|
} while (0);
|
|
#ifdef OLD_TTY_DRIVER
|
|
if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) {
|
|
out2str("sh: need new tty driver to run job control; job control turned off\n");
|
|
mflag = 0;
|
|
return;
|
|
}
|
|
#endif
|
|
setsignal(SIGTSTP);
|
|
setsignal(SIGTTOU);
|
|
setsignal(SIGTTIN);
|
|
setpgid(0, rootpid);
|
|
#ifdef OLD_TTY_DRIVER
|
|
ioctl(2, TIOCSPGRP, (char *)&rootpid);
|
|
#else
|
|
tcsetpgrp(2, rootpid);
|
|
#endif
|
|
} else { /* turning job control off */
|
|
setpgid(0, initialpgrp);
|
|
#ifdef OLD_TTY_DRIVER
|
|
ioctl(2, TIOCSPGRP, (char *)&initialpgrp);
|
|
#else
|
|
tcsetpgrp(2, initialpgrp);
|
|
#endif
|
|
setsignal(SIGTSTP);
|
|
setsignal(SIGTTOU);
|
|
setsignal(SIGTTIN);
|
|
}
|
|
jobctl = enable;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef JOBS
|
|
static int
|
|
killcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
int signo = -1;
|
|
int list = 0;
|
|
int i;
|
|
pid_t pid;
|
|
struct job *jp;
|
|
|
|
if (argc <= 1) {
|
|
usage:
|
|
error(
|
|
"Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n"
|
|
"kill -l [exitstatus]"
|
|
);
|
|
}
|
|
|
|
if (*argv[1] == '-') {
|
|
signo = decode_signal(argv[1] + 1, 1);
|
|
if (signo < 0) {
|
|
int c;
|
|
|
|
while ((c = nextopt("ls:")) != '\0')
|
|
switch (c) {
|
|
case 'l':
|
|
list = 1;
|
|
break;
|
|
case 's':
|
|
signo = decode_signal(optionarg, 1);
|
|
if (signo < 0) {
|
|
error(
|
|
"invalid signal number or name: %s",
|
|
optionarg
|
|
);
|
|
}
|
|
break;
|
|
#ifdef DEBUG
|
|
default:
|
|
error(
|
|
"nextopt returned character code 0%o", c);
|
|
#endif
|
|
}
|
|
} else
|
|
argptr++;
|
|
}
|
|
|
|
if (!list && signo < 0)
|
|
signo = SIGTERM;
|
|
|
|
if ((signo < 0 || !*argptr) ^ list) {
|
|
goto usage;
|
|
}
|
|
|
|
if (list) {
|
|
const char *name;
|
|
|
|
if (!*argptr) {
|
|
out1str("0\n");
|
|
for (i = 1; i < NSIG; i++) {
|
|
name = u_signal_names(0, &i, 1);
|
|
if(name)
|
|
printf(snlfmt, name);
|
|
}
|
|
return 0;
|
|
}
|
|
name = u_signal_names(*argptr, &signo, -1);
|
|
if (name)
|
|
printf(snlfmt, name);
|
|
else
|
|
error("invalid signal number or exit status: %s",
|
|
*argptr);
|
|
return 0;
|
|
}
|
|
|
|
do {
|
|
if (**argptr == '%') {
|
|
jp = getjob(*argptr);
|
|
if (jp->jobctl == 0)
|
|
error("job %s not created under job control",
|
|
*argptr);
|
|
pid = -jp->ps[0].pid;
|
|
} else
|
|
pid = atoi(*argptr);
|
|
if (kill(pid, signo) != 0)
|
|
error("%s: %m", *argptr);
|
|
} while (*++argptr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
fgcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
struct job *jp;
|
|
int pgrp;
|
|
int status;
|
|
|
|
jp = getjob(argv[1]);
|
|
if (jp->jobctl == 0)
|
|
error("job not created under job control");
|
|
pgrp = jp->ps[0].pid;
|
|
#ifdef OLD_TTY_DRIVER
|
|
ioctl(2, TIOCSPGRP, (char *)&pgrp);
|
|
#else
|
|
tcsetpgrp(2, pgrp);
|
|
#endif
|
|
restartjob(jp);
|
|
INTOFF;
|
|
status = waitforjob(jp);
|
|
INTON;
|
|
return status;
|
|
}
|
|
|
|
|
|
static int
|
|
bgcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
struct job *jp;
|
|
|
|
do {
|
|
jp = getjob(*++argv);
|
|
if (jp->jobctl == 0)
|
|
error("job not created under job control");
|
|
restartjob(jp);
|
|
} while (--argc > 1);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void
|
|
restartjob(jp)
|
|
struct job *jp;
|
|
{
|
|
struct procstat *ps;
|
|
int i;
|
|
|
|
if (jp->state == JOBDONE)
|
|
return;
|
|
INTOFF;
|
|
killpg(jp->ps[0].pid, SIGCONT);
|
|
for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
|
|
if (WIFSTOPPED(ps->status)) {
|
|
ps->status = -1;
|
|
jp->state = 0;
|
|
}
|
|
}
|
|
INTON;
|
|
}
|
|
#endif
|
|
|
|
static void showjobs(int change);
|
|
|
|
|
|
static int
|
|
jobscmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
showjobs(0);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Print a list of jobs. If "change" is nonzero, only print jobs whose
|
|
* statuses have changed since the last call to showjobs.
|
|
*
|
|
* If the shell is interrupted in the process of creating a job, the
|
|
* result may be a job structure containing zero processes. Such structures
|
|
* will be freed here.
|
|
*/
|
|
|
|
static void
|
|
showjobs(change)
|
|
int change;
|
|
{
|
|
int jobno;
|
|
int procno;
|
|
int i;
|
|
struct job *jp;
|
|
struct procstat *ps;
|
|
int col;
|
|
char s[64];
|
|
|
|
TRACE(("showjobs(%d) called\n", change));
|
|
while (dowait(0, (struct job *)NULL) > 0);
|
|
for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
|
|
if (! jp->used)
|
|
continue;
|
|
if (jp->nprocs == 0) {
|
|
freejob(jp);
|
|
continue;
|
|
}
|
|
if (change && ! jp->changed)
|
|
continue;
|
|
procno = jp->nprocs;
|
|
for (ps = jp->ps ; ; ps++) { /* for each process */
|
|
if (ps == jp->ps)
|
|
snprintf(s, 64, "[%d] %ld ", jobno,
|
|
(long)ps->pid);
|
|
else
|
|
snprintf(s, 64, " %ld ",
|
|
(long)ps->pid);
|
|
out1str(s);
|
|
col = strlen(s);
|
|
s[0] = '\0';
|
|
if (ps->status == -1) {
|
|
/* don't print anything */
|
|
} else if (WIFEXITED(ps->status)) {
|
|
snprintf(s, 64, "Exit %d",
|
|
WEXITSTATUS(ps->status));
|
|
} else {
|
|
#ifdef JOBS
|
|
if (WIFSTOPPED(ps->status))
|
|
i = WSTOPSIG(ps->status);
|
|
else /* WIFSIGNALED(ps->status) */
|
|
#endif
|
|
i = WTERMSIG(ps->status);
|
|
if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
|
|
strcpy(s, sys_siglist[i & 0x7F]);
|
|
else
|
|
snprintf(s, 64, "Signal %d", i & 0x7F);
|
|
if (WCOREDUMP(ps->status))
|
|
strcat(s, " (core dumped)");
|
|
}
|
|
out1str(s);
|
|
col += strlen(s);
|
|
printf(
|
|
"%*c%s\n", 30 - col >= 0 ? 30 - col : 0, ' ',
|
|
ps->cmd
|
|
);
|
|
if (--procno <= 0)
|
|
break;
|
|
}
|
|
jp->changed = 0;
|
|
if (jp->state == JOBDONE) {
|
|
freejob(jp);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Mark a job structure as unused.
|
|
*/
|
|
|
|
static void
|
|
freejob(struct job *jp)
|
|
{
|
|
const struct procstat *ps;
|
|
int i;
|
|
|
|
INTOFF;
|
|
for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
|
|
if (ps->cmd != nullstr)
|
|
ckfree(ps->cmd);
|
|
}
|
|
if (jp->ps != &jp->ps0)
|
|
ckfree(jp->ps);
|
|
jp->used = 0;
|
|
#ifdef JOBS
|
|
if (curjob == jp - jobtab + 1)
|
|
curjob = 0;
|
|
#endif
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
waitcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
struct job *job;
|
|
int status, retval;
|
|
struct job *jp;
|
|
|
|
if (--argc > 0) {
|
|
start:
|
|
job = getjob(*++argv);
|
|
} else {
|
|
job = NULL;
|
|
}
|
|
for (;;) { /* loop until process terminated or stopped */
|
|
if (job != NULL) {
|
|
if (job->state) {
|
|
status = job->ps[job->nprocs - 1].status;
|
|
if (! iflag)
|
|
freejob(job);
|
|
if (--argc) {
|
|
goto start;
|
|
}
|
|
if (WIFEXITED(status))
|
|
retval = WEXITSTATUS(status);
|
|
#ifdef JOBS
|
|
else if (WIFSTOPPED(status))
|
|
retval = WSTOPSIG(status) + 128;
|
|
#endif
|
|
else {
|
|
/* XXX: limits number of signals */
|
|
retval = WTERMSIG(status) + 128;
|
|
}
|
|
return retval;
|
|
}
|
|
} else {
|
|
for (jp = jobtab ; ; jp++) {
|
|
if (jp >= jobtab + njobs) { /* no running procs */
|
|
return 0;
|
|
}
|
|
if (jp->used && jp->state == 0)
|
|
break;
|
|
}
|
|
}
|
|
if (dowait(2, 0) < 0 && errno == EINTR) {
|
|
return 129;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Convert a job name to a job structure.
|
|
*/
|
|
|
|
static struct job *
|
|
getjob(const char *name)
|
|
{
|
|
int jobno;
|
|
struct job *jp;
|
|
int pid;
|
|
int i;
|
|
|
|
if (name == NULL) {
|
|
#ifdef JOBS
|
|
currentjob:
|
|
if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0)
|
|
error("No current job");
|
|
return &jobtab[jobno - 1];
|
|
#else
|
|
error("No current job");
|
|
#endif
|
|
} else if (name[0] == '%') {
|
|
if (is_digit(name[1])) {
|
|
jobno = number(name + 1);
|
|
if (jobno > 0 && jobno <= njobs
|
|
&& jobtab[jobno - 1].used != 0)
|
|
return &jobtab[jobno - 1];
|
|
#ifdef JOBS
|
|
} else if (name[1] == '%' && name[2] == '\0') {
|
|
goto currentjob;
|
|
#endif
|
|
} else {
|
|
struct job *found = NULL;
|
|
for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
|
|
if (jp->used && jp->nprocs > 0
|
|
&& prefix(name + 1, jp->ps[0].cmd)) {
|
|
if (found)
|
|
error("%s: ambiguous", name);
|
|
found = jp;
|
|
}
|
|
}
|
|
if (found)
|
|
return found;
|
|
}
|
|
} else if (is_number(name, &pid)) {
|
|
for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
|
|
if (jp->used && jp->nprocs > 0
|
|
&& jp->ps[jp->nprocs - 1].pid == pid)
|
|
return jp;
|
|
}
|
|
}
|
|
error("No such job: %s", name);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Return a new job structure,
|
|
*/
|
|
|
|
static struct job *
|
|
makejob(const union node *node, int nprocs)
|
|
{
|
|
int i;
|
|
struct job *jp;
|
|
|
|
for (i = njobs, jp = jobtab ; ; jp++) {
|
|
if (--i < 0) {
|
|
INTOFF;
|
|
if (njobs == 0) {
|
|
jobtab = ckmalloc(4 * sizeof jobtab[0]);
|
|
} else {
|
|
jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
|
|
memcpy(jp, jobtab, njobs * sizeof jp[0]);
|
|
/* Relocate `ps' pointers */
|
|
for (i = 0; i < njobs; i++)
|
|
if (jp[i].ps == &jobtab[i].ps0)
|
|
jp[i].ps = &jp[i].ps0;
|
|
ckfree(jobtab);
|
|
jobtab = jp;
|
|
}
|
|
jp = jobtab + njobs;
|
|
for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
|
|
INTON;
|
|
break;
|
|
}
|
|
if (jp->used == 0)
|
|
break;
|
|
}
|
|
INTOFF;
|
|
jp->state = 0;
|
|
jp->used = 1;
|
|
jp->changed = 0;
|
|
jp->nprocs = 0;
|
|
#ifdef JOBS
|
|
jp->jobctl = jobctl;
|
|
#endif
|
|
if (nprocs > 1) {
|
|
jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
|
|
} else {
|
|
jp->ps = &jp->ps0;
|
|
}
|
|
INTON;
|
|
TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
|
|
jp - jobtab + 1));
|
|
return jp;
|
|
}
|
|
|
|
|
|
/*
|
|
* Fork of a subshell. If we are doing job control, give the subshell its
|
|
* own process group. Jp is a job structure that the job is to be added to.
|
|
* N is the command that will be evaluated by the child. Both jp and n may
|
|
* be NULL. The mode parameter can be one of the following:
|
|
* FORK_FG - Fork off a foreground process.
|
|
* FORK_BG - Fork off a background process.
|
|
* FORK_NOJOB - Like FORK_FG, but don't give the process its own
|
|
* process group even if job control is on.
|
|
*
|
|
* When job control is turned off, background processes have their standard
|
|
* input redirected to /dev/null (except for the second and later processes
|
|
* in a pipeline).
|
|
*/
|
|
|
|
|
|
|
|
static int
|
|
forkshell(struct job *jp, const union node *n, int mode)
|
|
{
|
|
int pid;
|
|
#ifdef JOBS
|
|
int pgrp;
|
|
#endif
|
|
const char *devnull = _PATH_DEVNULL;
|
|
const char *nullerr = "Can't open %s";
|
|
|
|
TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n,
|
|
mode));
|
|
INTOFF;
|
|
pid = fork();
|
|
if (pid == -1) {
|
|
TRACE(("Fork failed, errno=%d\n", errno));
|
|
INTON;
|
|
error("Cannot fork");
|
|
}
|
|
if (pid == 0) {
|
|
struct job *p;
|
|
int wasroot;
|
|
int i;
|
|
|
|
TRACE(("Child shell %d\n", getpid()));
|
|
wasroot = rootshell;
|
|
rootshell = 0;
|
|
closescript();
|
|
INTON;
|
|
clear_traps();
|
|
#ifdef JOBS
|
|
jobctl = 0; /* do job control only in root shell */
|
|
if (wasroot && mode != FORK_NOJOB && mflag) {
|
|
if (jp == NULL || jp->nprocs == 0)
|
|
pgrp = getpid();
|
|
else
|
|
pgrp = jp->ps[0].pid;
|
|
setpgid(0, pgrp);
|
|
if (mode == FORK_FG) {
|
|
/*** this causes superfluous TIOCSPGRPS ***/
|
|
#ifdef OLD_TTY_DRIVER
|
|
if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0)
|
|
error("TIOCSPGRP failed, errno=%d", errno);
|
|
#else
|
|
if (tcsetpgrp(2, pgrp) < 0)
|
|
error("tcsetpgrp failed, errno=%d", errno);
|
|
#endif
|
|
}
|
|
setsignal(SIGTSTP);
|
|
setsignal(SIGTTOU);
|
|
} else if (mode == FORK_BG) {
|
|
ignoresig(SIGINT);
|
|
ignoresig(SIGQUIT);
|
|
if ((jp == NULL || jp->nprocs == 0) &&
|
|
! fd0_redirected_p ()) {
|
|
close(0);
|
|
if (open(devnull, O_RDONLY) != 0)
|
|
error(nullerr, devnull);
|
|
}
|
|
}
|
|
#else
|
|
if (mode == FORK_BG) {
|
|
ignoresig(SIGINT);
|
|
ignoresig(SIGQUIT);
|
|
if ((jp == NULL || jp->nprocs == 0) &&
|
|
! fd0_redirected_p ()) {
|
|
close(0);
|
|
if (open(devnull, O_RDONLY) != 0)
|
|
error(nullerr, devnull);
|
|
}
|
|
}
|
|
#endif
|
|
for (i = njobs, p = jobtab ; --i >= 0 ; p++)
|
|
if (p->used)
|
|
freejob(p);
|
|
if (wasroot && iflag) {
|
|
setsignal(SIGINT);
|
|
setsignal(SIGQUIT);
|
|
setsignal(SIGTERM);
|
|
}
|
|
return pid;
|
|
}
|
|
#ifdef JOBS
|
|
if (rootshell && mode != FORK_NOJOB && mflag) {
|
|
if (jp == NULL || jp->nprocs == 0)
|
|
pgrp = pid;
|
|
else
|
|
pgrp = jp->ps[0].pid;
|
|
setpgid(pid, pgrp);
|
|
}
|
|
#endif
|
|
if (mode == FORK_BG)
|
|
backgndpid = pid; /* set $! */
|
|
if (jp) {
|
|
struct procstat *ps = &jp->ps[jp->nprocs++];
|
|
ps->pid = pid;
|
|
ps->status = -1;
|
|
ps->cmd = nullstr;
|
|
if (iflag && rootshell && n)
|
|
ps->cmd = commandtext(n);
|
|
}
|
|
INTON;
|
|
TRACE(("In parent shell: child = %d\n", pid));
|
|
return pid;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Wait for job to finish.
|
|
*
|
|
* Under job control we have the problem that while a child process is
|
|
* running interrupts generated by the user are sent to the child but not
|
|
* to the shell. This means that an infinite loop started by an inter-
|
|
* active user may be hard to kill. With job control turned off, an
|
|
* interactive user may place an interactive program inside a loop. If
|
|
* the interactive program catches interrupts, the user doesn't want
|
|
* these interrupts to also abort the loop. The approach we take here
|
|
* is to have the shell ignore interrupt signals while waiting for a
|
|
* forground process to terminate, and then send itself an interrupt
|
|
* signal if the child process was terminated by an interrupt signal.
|
|
* Unfortunately, some programs want to do a bit of cleanup and then
|
|
* exit on interrupt; unless these processes terminate themselves by
|
|
* sending a signal to themselves (instead of calling exit) they will
|
|
* confuse this approach.
|
|
*/
|
|
|
|
static int
|
|
waitforjob(struct job *jp)
|
|
{
|
|
#ifdef JOBS
|
|
int mypgrp = getpgrp();
|
|
#endif
|
|
int status;
|
|
int st;
|
|
struct sigaction act, oact;
|
|
|
|
INTOFF;
|
|
intreceived = 0;
|
|
#ifdef JOBS
|
|
if (!jobctl) {
|
|
#else
|
|
if (!iflag) {
|
|
#endif
|
|
sigaction(SIGINT, 0, &act);
|
|
act.sa_handler = waitonint;
|
|
sigaction(SIGINT, &act, &oact);
|
|
}
|
|
TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
|
|
while (jp->state == 0) {
|
|
dowait(1, jp);
|
|
}
|
|
#ifdef JOBS
|
|
if (!jobctl) {
|
|
#else
|
|
if (!iflag) {
|
|
#endif
|
|
sigaction(SIGINT, &oact, 0);
|
|
if (intreceived && trap[SIGINT]) kill(getpid(), SIGINT);
|
|
}
|
|
#ifdef JOBS
|
|
if (jp->jobctl) {
|
|
#ifdef OLD_TTY_DRIVER
|
|
if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0)
|
|
error("TIOCSPGRP failed, errno=%d\n", errno);
|
|
#else
|
|
if (tcsetpgrp(2, mypgrp) < 0)
|
|
error("tcsetpgrp failed, errno=%d\n", errno);
|
|
#endif
|
|
}
|
|
if (jp->state == JOBSTOPPED)
|
|
curjob = jp - jobtab + 1;
|
|
#endif
|
|
status = jp->ps[jp->nprocs - 1].status;
|
|
/* convert to 8 bits */
|
|
if (WIFEXITED(status))
|
|
st = WEXITSTATUS(status);
|
|
#ifdef JOBS
|
|
else if (WIFSTOPPED(status))
|
|
st = WSTOPSIG(status) + 128;
|
|
#endif
|
|
else
|
|
st = WTERMSIG(status) + 128;
|
|
#ifdef JOBS
|
|
if (jp->jobctl) {
|
|
/*
|
|
* This is truly gross.
|
|
* If we're doing job control, then we did a TIOCSPGRP which
|
|
* caused us (the shell) to no longer be in the controlling
|
|
* session -- so we wouldn't have seen any ^C/SIGINT. So, we
|
|
* intuit from the subprocess exit status whether a SIGINT
|
|
* occured, and if so interrupt ourselves. Yuck. - mycroft
|
|
*/
|
|
if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
|
|
raise(SIGINT);
|
|
}
|
|
if (jp->state == JOBDONE)
|
|
|
|
#endif
|
|
freejob(jp);
|
|
INTON;
|
|
return st;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Wait for a process to terminate.
|
|
*/
|
|
|
|
/*
|
|
* Do a wait system call. If job control is compiled in, we accept
|
|
* stopped processes. If block is zero, we return a value of zero
|
|
* rather than blocking.
|
|
*
|
|
* System V doesn't have a non-blocking wait system call. It does
|
|
* have a SIGCLD signal that is sent to a process when one of it's
|
|
* children dies. The obvious way to use SIGCLD would be to install
|
|
* a handler for SIGCLD which simply bumped a counter when a SIGCLD
|
|
* was received, and have waitproc bump another counter when it got
|
|
* the status of a process. Waitproc would then know that a wait
|
|
* system call would not block if the two counters were different.
|
|
* This approach doesn't work because if a process has children that
|
|
* have not been waited for, System V will send it a SIGCLD when it
|
|
* installs a signal handler for SIGCLD. What this means is that when
|
|
* a child exits, the shell will be sent SIGCLD signals continuously
|
|
* until is runs out of stack space, unless it does a wait call before
|
|
* restoring the signal handler. The code below takes advantage of
|
|
* this (mis)feature by installing a signal handler for SIGCLD and
|
|
* then checking to see whether it was called. If there are any
|
|
* children to be waited for, it will be.
|
|
*
|
|
*/
|
|
|
|
static inline int
|
|
waitproc(int block, int *status)
|
|
{
|
|
int flags;
|
|
|
|
flags = 0;
|
|
#ifdef JOBS
|
|
if (jobctl)
|
|
flags |= WUNTRACED;
|
|
#endif
|
|
if (block == 0)
|
|
flags |= WNOHANG;
|
|
return wait3(status, flags, (struct rusage *)NULL);
|
|
}
|
|
|
|
static int
|
|
dowait(int block, struct job *job)
|
|
{
|
|
int pid;
|
|
int status;
|
|
struct procstat *sp;
|
|
struct job *jp;
|
|
struct job *thisjob;
|
|
int done;
|
|
int stopped;
|
|
int core;
|
|
int sig;
|
|
|
|
TRACE(("dowait(%d) called\n", block));
|
|
do {
|
|
pid = waitproc(block, &status);
|
|
TRACE(("wait returns %d, status=%d\n", pid, status));
|
|
} while (!(block & 2) && pid == -1 && errno == EINTR);
|
|
if (pid <= 0)
|
|
return pid;
|
|
INTOFF;
|
|
thisjob = NULL;
|
|
for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
|
|
if (jp->used) {
|
|
done = 1;
|
|
stopped = 1;
|
|
for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
|
|
if (sp->pid == -1)
|
|
continue;
|
|
if (sp->pid == pid) {
|
|
TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status));
|
|
sp->status = status;
|
|
thisjob = jp;
|
|
}
|
|
if (sp->status == -1)
|
|
stopped = 0;
|
|
else if (WIFSTOPPED(sp->status))
|
|
done = 0;
|
|
}
|
|
if (stopped) { /* stopped or done */
|
|
int state = done? JOBDONE : JOBSTOPPED;
|
|
if (jp->state != state) {
|
|
TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
|
|
jp->state = state;
|
|
#ifdef JOBS
|
|
if (done && curjob == jp - jobtab + 1)
|
|
curjob = 0; /* no current job */
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
}
|
|
INTON;
|
|
if (! rootshell || ! iflag || (job && thisjob == job)) {
|
|
core = WCOREDUMP(status);
|
|
#ifdef JOBS
|
|
if (WIFSTOPPED(status)) sig = WSTOPSIG(status);
|
|
else
|
|
#endif
|
|
if (WIFEXITED(status)) sig = 0;
|
|
else sig = WTERMSIG(status);
|
|
|
|
if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
|
|
if (thisjob != job)
|
|
out2fmt("%d: ", pid);
|
|
#ifdef JOBS
|
|
if (sig == SIGTSTP && rootshell && iflag)
|
|
out2fmt("%%%ld ",
|
|
(long)(job - jobtab + 1));
|
|
#endif
|
|
if (sig < NSIG && sys_siglist[sig])
|
|
out2str(sys_siglist[sig]);
|
|
else
|
|
out2fmt("Signal %d", sig);
|
|
if (core)
|
|
out2str(" - core dumped");
|
|
out2c('\n');
|
|
} else {
|
|
TRACE(("Not printing status: status=%d, sig=%d\n",
|
|
status, sig));
|
|
}
|
|
} else {
|
|
TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job));
|
|
if (thisjob)
|
|
thisjob->changed = 1;
|
|
}
|
|
return pid;
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
* return 1 if there are stopped jobs, otherwise 0
|
|
*/
|
|
static int
|
|
stoppedjobs(void)
|
|
{
|
|
int jobno;
|
|
struct job *jp;
|
|
|
|
if (job_warning)
|
|
return (0);
|
|
for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
|
|
if (jp->used == 0)
|
|
continue;
|
|
if (jp->state == JOBSTOPPED) {
|
|
out2str("You have stopped jobs.\n");
|
|
job_warning = 2;
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Return a string identifying a command (to be printed by the
|
|
* jobs command.
|
|
*/
|
|
|
|
static char *cmdnextc;
|
|
static int cmdnleft;
|
|
#define MAXCMDTEXT 200
|
|
|
|
static void
|
|
cmdputs(const char *s)
|
|
{
|
|
const char *p;
|
|
char *q;
|
|
char c;
|
|
int subtype = 0;
|
|
|
|
if (cmdnleft <= 0)
|
|
return;
|
|
p = s;
|
|
q = cmdnextc;
|
|
while ((c = *p++) != '\0') {
|
|
if (c == CTLESC)
|
|
*q++ = *p++;
|
|
else if (c == CTLVAR) {
|
|
*q++ = '$';
|
|
if (--cmdnleft > 0)
|
|
*q++ = '{';
|
|
subtype = *p++;
|
|
} else if (c == '=' && subtype != 0) {
|
|
*q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
|
|
subtype = 0;
|
|
} else if (c == CTLENDVAR) {
|
|
*q++ = '}';
|
|
} else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
|
|
cmdnleft++; /* ignore it */
|
|
else
|
|
*q++ = c;
|
|
if (--cmdnleft <= 0) {
|
|
*q++ = '.';
|
|
*q++ = '.';
|
|
*q++ = '.';
|
|
break;
|
|
}
|
|
}
|
|
cmdnextc = q;
|
|
}
|
|
|
|
#define CMDTXT_TABLE
|
|
#ifdef CMDTXT_TABLE
|
|
/*
|
|
* To collect a lot of redundant code in cmdtxt() case statements, we
|
|
* implement a mini language here. Each type of node struct has an
|
|
* associated instruction sequence that operates on its members via
|
|
* their offsets. The instruction are pack in unsigned chars with
|
|
* format IIDDDDDE where the bits are
|
|
* I : part of the instruction opcode, which are
|
|
* 00 : member is a pointer to another node -- process it recursively
|
|
* 40 : member is a pointer to a char string -- output it
|
|
* 80 : output the string whose index is stored in the data field
|
|
* CC : flag signaling that this case needs external processing
|
|
* D : data - either the (shifted) index of a fixed string to output or
|
|
* the actual offset of the member to operate on in the struct
|
|
* (since we assume bit 0 is set, the offset is not shifted)
|
|
* E : flag signaling end of instruction sequence
|
|
*
|
|
* WARNING: In order to handle larger offsets for 64bit archs, this code
|
|
* assumes that no offset can be an odd number and stores the
|
|
* end-of-instructions flag in bit 0.
|
|
*/
|
|
|
|
#define CMDTXT_NOMORE 0x01 /* NOTE: no offset should be odd */
|
|
#define CMDTXT_CHARPTR 0x40
|
|
#define CMDTXT_STRING 0x80
|
|
#define CMDTXT_SPECIAL 0xC0
|
|
#define CMDTXT_OFFSETMASK 0x3E
|
|
|
|
static const char * const cmdtxt_strings[] = {
|
|
/* 0 1 2 3 4 5 6 7 */
|
|
"; ", "(", ")", " && ", " || ", "if ", "; then ", "...",
|
|
/* 8 9 10 11 12 13 */
|
|
"while ", "; do ", "; done", "until ", "for ", " in ...",
|
|
/* 14 15 16 17 */
|
|
"case ", "???", "() ...", "<<..."
|
|
};
|
|
|
|
static const char * const redir_strings[] = {
|
|
">", "<", "<>", ">>", ">|", ">&", "<&"
|
|
};
|
|
|
|
static const unsigned char cmdtxt_ops[] = {
|
|
#define CMDTXT_NSEMI 0
|
|
offsetof(union node, nbinary.ch1),
|
|
0|CMDTXT_STRING,
|
|
offsetof(union node, nbinary.ch2)|CMDTXT_NOMORE,
|
|
#define CMDTXT_NCMD (CMDTXT_NSEMI + 3)
|
|
#define CMDTXT_NPIPE (CMDTXT_NCMD)
|
|
#define CMDTXT_NCASE (CMDTXT_NCMD)
|
|
#define CMDTXT_NTO (CMDTXT_NCMD)
|
|
#define CMDTXT_NFROM (CMDTXT_NCMD)
|
|
#define CMDTXT_NFROMTO (CMDTXT_NCMD)
|
|
#define CMDTXT_NAPPEND (CMDTXT_NCMD)
|
|
#define CMDTXT_NTOOV (CMDTXT_NCMD)
|
|
#define CMDTXT_NTOFD (CMDTXT_NCMD)
|
|
#define CMDTXT_NFROMFD (CMDTXT_NCMD)
|
|
CMDTXT_SPECIAL,
|
|
#define CMDTXT_NREDIR (CMDTXT_NPIPE + 1)
|
|
#define CMDTXT_NBACKGND (CMDTXT_NREDIR)
|
|
offsetof(union node, nredir.n)|CMDTXT_NOMORE,
|
|
#define CMDTXT_NSUBSHELL (CMDTXT_NBACKGND + 1)
|
|
(1*2)|CMDTXT_STRING,
|
|
offsetof(union node, nredir.n),
|
|
(2*2)|CMDTXT_STRING|CMDTXT_NOMORE,
|
|
#define CMDTXT_NAND (CMDTXT_NSUBSHELL + 3)
|
|
offsetof(union node, nbinary.ch1),
|
|
(3*2)|CMDTXT_STRING,
|
|
offsetof(union node, nbinary.ch2)|CMDTXT_NOMORE,
|
|
#define CMDTXT_NOR (CMDTXT_NAND + 3)
|
|
offsetof(union node, nbinary.ch1),
|
|
(4*2)|CMDTXT_STRING,
|
|
offsetof(union node, nbinary.ch2)|CMDTXT_NOMORE,
|
|
#define CMDTXT_NIF (CMDTXT_NOR + 3)
|
|
(5*2)|CMDTXT_STRING,
|
|
offsetof(union node, nif.test),
|
|
(6*2)|CMDTXT_STRING,
|
|
offsetof(union node, nif.ifpart),
|
|
(7*2)|CMDTXT_STRING|CMDTXT_NOMORE,
|
|
#define CMDTXT_NWHILE (CMDTXT_NIF + 5)
|
|
(8*2)|CMDTXT_STRING,
|
|
offsetof(union node, nbinary.ch1),
|
|
(9*2)|CMDTXT_STRING,
|
|
offsetof(union node, nbinary.ch2),
|
|
(10*2)|CMDTXT_STRING|CMDTXT_NOMORE,
|
|
#define CMDTXT_NUNTIL (CMDTXT_NWHILE + 5)
|
|
(11*2)|CMDTXT_STRING,
|
|
offsetof(union node, nbinary.ch1),
|
|
(9*2)|CMDTXT_STRING,
|
|
offsetof(union node, nbinary.ch2),
|
|
(10*2)|CMDTXT_STRING|CMDTXT_NOMORE,
|
|
#define CMDTXT_NFOR (CMDTXT_NUNTIL + 5)
|
|
(12*2)|CMDTXT_STRING,
|
|
offsetof(union node, nfor.var)|CMDTXT_CHARPTR,
|
|
(13*2)|CMDTXT_STRING|CMDTXT_NOMORE,
|
|
#define CMDTXT_NCLIST (CMDTXT_NFOR + 3) /* TODO: IS THIS CORRECT??? */
|
|
#define CMDTXT_NNOT (CMDTXT_NCLIST) /* TODO: IS THIS CORRECT??? */
|
|
(15*2)|CMDTXT_STRING|CMDTXT_NOMORE,
|
|
#define CMDTXT_NDEFUN (CMDTXT_NCLIST + 1)
|
|
offsetof(union node, narg.text)|CMDTXT_CHARPTR,
|
|
(16*2)|CMDTXT_STRING|CMDTXT_NOMORE,
|
|
#define CMDTXT_NARG (CMDTXT_NDEFUN + 2)
|
|
offsetof(union node, narg.text)|CMDTXT_CHARPTR|CMDTXT_NOMORE,
|
|
#define CMDTXT_NHERE (CMDTXT_NARG + 1)
|
|
#define CMDTXT_NXHERE (CMDTXT_NHERE)
|
|
(17*2)|CMDTXT_STRING|CMDTXT_NOMORE,
|
|
};
|
|
|
|
#if CMDTXT_NXHERE != 36
|
|
#error CMDTXT_NXHERE
|
|
#endif
|
|
|
|
static const unsigned char cmdtxt_ops_index[26] = {
|
|
CMDTXT_NSEMI,
|
|
CMDTXT_NCMD,
|
|
CMDTXT_NPIPE,
|
|
CMDTXT_NREDIR,
|
|
CMDTXT_NBACKGND,
|
|
CMDTXT_NSUBSHELL,
|
|
CMDTXT_NAND,
|
|
CMDTXT_NOR,
|
|
CMDTXT_NIF,
|
|
CMDTXT_NWHILE,
|
|
CMDTXT_NUNTIL,
|
|
CMDTXT_NFOR,
|
|
CMDTXT_NCASE,
|
|
CMDTXT_NCLIST,
|
|
CMDTXT_NDEFUN,
|
|
CMDTXT_NARG,
|
|
CMDTXT_NTO,
|
|
CMDTXT_NFROM,
|
|
CMDTXT_NFROMTO,
|
|
CMDTXT_NAPPEND,
|
|
CMDTXT_NTOOV,
|
|
CMDTXT_NTOFD,
|
|
CMDTXT_NFROMFD,
|
|
CMDTXT_NHERE,
|
|
CMDTXT_NXHERE,
|
|
CMDTXT_NNOT,
|
|
};
|
|
|
|
static void
|
|
cmdtxt(const union node *n)
|
|
{
|
|
const char *p;
|
|
|
|
if (n == NULL)
|
|
return;
|
|
|
|
p = cmdtxt_ops + (int) cmdtxt_ops_index[n->type];
|
|
if ((*p & CMDTXT_SPECIAL) != CMDTXT_SPECIAL) { /* normal case */
|
|
do {
|
|
if (*p & CMDTXT_STRING) { /* output fixed string */
|
|
cmdputs(cmdtxt_strings[((int)(*p & CMDTXT_OFFSETMASK) >> 1)]);
|
|
} else {
|
|
const char *pf = ((const char *) n)
|
|
+ ((int)(*p & CMDTXT_OFFSETMASK));
|
|
if (*p & CMDTXT_CHARPTR) { /* output dynamic string */
|
|
cmdputs(*((const char **) pf));
|
|
} else { /* output field */
|
|
cmdtxt(*((const union node **) pf));
|
|
}
|
|
}
|
|
} while (!(*p++ & CMDTXT_NOMORE));
|
|
} else if (n->type == NCMD) {
|
|
union node *np;
|
|
for (np = n->ncmd.args ; np ; np = np->narg.next) {
|
|
cmdtxt(np);
|
|
if (np->narg.next)
|
|
cmdputs(spcstr);
|
|
}
|
|
for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
|
|
cmdputs(spcstr);
|
|
cmdtxt(np);
|
|
}
|
|
} else if (n->type == NPIPE) {
|
|
struct nodelist *lp;
|
|
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
|
|
cmdtxt(lp->n);
|
|
if (lp->next)
|
|
cmdputs(" | ");
|
|
}
|
|
} else if (n->type == NCASE) {
|
|
cmdputs(cmdtxt_strings[14]);
|
|
cmdputs(n->ncase.expr->narg.text);
|
|
cmdputs(cmdtxt_strings[13]);
|
|
} else {
|
|
#if (NTO != 16) || (NFROM != 17) || (NFROMTO != 18) || (NAPPEND != 19) || (NTOOV != 20) || (NTOFD != 21) || (NFROMFD != 22)
|
|
#error Assumption violated regarding range and ordering of NTO ... NFROMFD!
|
|
#endif
|
|
char s[2];
|
|
|
|
#ifdef DEBUG
|
|
assert((n->type >= NTO) && (n->type <= NFROMFD));
|
|
#endif
|
|
|
|
p = redir_strings[n->type - NTO];
|
|
if (n->nfile.fd != ('>' == *p)) {
|
|
s[0] = n->nfile.fd + '0';
|
|
s[1] = '\0';
|
|
cmdputs(s);
|
|
}
|
|
cmdputs(p);
|
|
if (n->type >= NTOFD) {
|
|
s[0] = n->ndup.dupfd + '0';
|
|
s[1] = '\0';
|
|
cmdputs(s);
|
|
} else {
|
|
cmdtxt(n->nfile.fname);
|
|
}
|
|
}
|
|
}
|
|
#else /* CMDTXT_TABLE */
|
|
static void
|
|
cmdtxt(const union node *n)
|
|
{
|
|
union node *np;
|
|
struct nodelist *lp;
|
|
const char *p;
|
|
int i;
|
|
char s[2];
|
|
|
|
if (n == NULL)
|
|
return;
|
|
switch (n->type) {
|
|
case NSEMI:
|
|
cmdtxt(n->nbinary.ch1);
|
|
cmdputs("; ");
|
|
cmdtxt(n->nbinary.ch2);
|
|
break;
|
|
case NAND:
|
|
cmdtxt(n->nbinary.ch1);
|
|
cmdputs(" && ");
|
|
cmdtxt(n->nbinary.ch2);
|
|
break;
|
|
case NOR:
|
|
cmdtxt(n->nbinary.ch1);
|
|
cmdputs(" || ");
|
|
cmdtxt(n->nbinary.ch2);
|
|
break;
|
|
case NPIPE:
|
|
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
|
|
cmdtxt(lp->n);
|
|
if (lp->next)
|
|
cmdputs(" | ");
|
|
}
|
|
break;
|
|
case NSUBSHELL:
|
|
cmdputs("(");
|
|
cmdtxt(n->nredir.n);
|
|
cmdputs(")");
|
|
break;
|
|
case NREDIR:
|
|
case NBACKGND:
|
|
cmdtxt(n->nredir.n);
|
|
break;
|
|
case NIF:
|
|
cmdputs("if ");
|
|
cmdtxt(n->nif.test);
|
|
cmdputs("; then ");
|
|
cmdtxt(n->nif.ifpart);
|
|
cmdputs("...");
|
|
break;
|
|
case NWHILE:
|
|
cmdputs("while ");
|
|
goto until;
|
|
case NUNTIL:
|
|
cmdputs("until ");
|
|
until:
|
|
cmdtxt(n->nbinary.ch1);
|
|
cmdputs("; do ");
|
|
cmdtxt(n->nbinary.ch2);
|
|
cmdputs("; done");
|
|
break;
|
|
case NFOR:
|
|
cmdputs("for ");
|
|
cmdputs(n->nfor.var);
|
|
cmdputs(" in ...");
|
|
break;
|
|
case NCASE:
|
|
cmdputs("case ");
|
|
cmdputs(n->ncase.expr->narg.text);
|
|
cmdputs(" in ...");
|
|
break;
|
|
case NDEFUN:
|
|
cmdputs(n->narg.text);
|
|
cmdputs("() ...");
|
|
break;
|
|
case NCMD:
|
|
for (np = n->ncmd.args ; np ; np = np->narg.next) {
|
|
cmdtxt(np);
|
|
if (np->narg.next)
|
|
cmdputs(spcstr);
|
|
}
|
|
for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
|
|
cmdputs(spcstr);
|
|
cmdtxt(np);
|
|
}
|
|
break;
|
|
case NARG:
|
|
cmdputs(n->narg.text);
|
|
break;
|
|
case NTO:
|
|
p = ">"; i = 1; goto redir;
|
|
case NAPPEND:
|
|
p = ">>"; i = 1; goto redir;
|
|
case NTOFD:
|
|
p = ">&"; i = 1; goto redir;
|
|
case NTOOV:
|
|
p = ">|"; i = 1; goto redir;
|
|
case NFROM:
|
|
p = "<"; i = 0; goto redir;
|
|
case NFROMFD:
|
|
p = "<&"; i = 0; goto redir;
|
|
case NFROMTO:
|
|
p = "<>"; i = 0; goto redir;
|
|
redir:
|
|
if (n->nfile.fd != i) {
|
|
s[0] = n->nfile.fd + '0';
|
|
s[1] = '\0';
|
|
cmdputs(s);
|
|
}
|
|
cmdputs(p);
|
|
if (n->type == NTOFD || n->type == NFROMFD) {
|
|
s[0] = n->ndup.dupfd + '0';
|
|
s[1] = '\0';
|
|
cmdputs(s);
|
|
} else {
|
|
cmdtxt(n->nfile.fname);
|
|
}
|
|
break;
|
|
case NHERE:
|
|
case NXHERE:
|
|
cmdputs("<<...");
|
|
break;
|
|
default:
|
|
cmdputs("???");
|
|
break;
|
|
}
|
|
}
|
|
#endif /* CMDTXT_TABLE */
|
|
|
|
static char *
|
|
commandtext(const union node *n)
|
|
{
|
|
char *name;
|
|
|
|
cmdnextc = name = ckmalloc(MAXCMDTEXT);
|
|
cmdnleft = MAXCMDTEXT - 4;
|
|
cmdtxt(n);
|
|
*cmdnextc = '\0';
|
|
return name;
|
|
}
|
|
|
|
|
|
static void waitonint(int sig) {
|
|
intreceived = 1;
|
|
return;
|
|
}
|
|
/*
|
|
* Routines to check for mail. (Perhaps make part of main.c?)
|
|
*/
|
|
|
|
|
|
#define MAXMBOXES 10
|
|
|
|
|
|
static int nmboxes; /* number of mailboxes */
|
|
static time_t mailtime[MAXMBOXES]; /* times of mailboxes */
|
|
|
|
|
|
|
|
/*
|
|
* Print appropriate message(s) if mail has arrived. If the argument is
|
|
* nozero, then the value of MAIL has changed, so we just update the
|
|
* values.
|
|
*/
|
|
|
|
static void
|
|
chkmail(int silent)
|
|
{
|
|
int i;
|
|
const char *mpath;
|
|
char *p;
|
|
char *q;
|
|
struct stackmark smark;
|
|
struct stat statb;
|
|
|
|
if (silent)
|
|
nmboxes = 10;
|
|
if (nmboxes == 0)
|
|
return;
|
|
setstackmark(&smark);
|
|
mpath = mpathset()? mpathval() : mailval();
|
|
for (i = 0 ; i < nmboxes ; i++) {
|
|
p = padvance(&mpath, nullstr);
|
|
if (p == NULL)
|
|
break;
|
|
if (*p == '\0')
|
|
continue;
|
|
for (q = p ; *q ; q++);
|
|
#ifdef DEBUG
|
|
if (q[-1] != '/')
|
|
abort();
|
|
#endif
|
|
q[-1] = '\0'; /* delete trailing '/' */
|
|
if (stat(p, &statb) < 0)
|
|
statb.st_size = 0;
|
|
if (statb.st_size > mailtime[i] && ! silent) {
|
|
out2fmt(snlfmt,
|
|
pathopt? pathopt : "you have mail");
|
|
}
|
|
mailtime[i] = statb.st_size;
|
|
}
|
|
nmboxes = i;
|
|
popstackmark(&smark);
|
|
}
|
|
|
|
#define PROFILE 0
|
|
|
|
#if PROFILE
|
|
static short profile_buf[16384];
|
|
extern int etext();
|
|
#endif
|
|
|
|
static void read_profile (const char *);
|
|
static void cmdloop (int);
|
|
static void options (int);
|
|
static void setoption (int, int);
|
|
static void procargs (int, char **);
|
|
|
|
|
|
/*
|
|
* Main routine. We initialize things, parse the arguments, execute
|
|
* profiles if we're a login shell, and then call cmdloop to execute
|
|
* commands. The setjmp call sets up the location to jump to when an
|
|
* exception occurs. When an exception occurs the variable "state"
|
|
* is used to figure out how far we had gotten.
|
|
*/
|
|
|
|
int
|
|
ash_main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
struct jmploc jmploc;
|
|
struct stackmark smark;
|
|
volatile int state;
|
|
const char *shinit;
|
|
|
|
BLTINCMD = find_builtin("builtin");
|
|
EXECCMD = find_builtin("exec");
|
|
EVALCMD = find_builtin("eval");
|
|
|
|
#ifndef BB_FEATURE_SH_FANCY_PROMPT
|
|
unsetenv("PS1");
|
|
unsetenv("PS2");
|
|
#endif
|
|
|
|
#if PROFILE
|
|
monitor(4, etext, profile_buf, sizeof profile_buf, 50);
|
|
#endif
|
|
#if defined(linux) || defined(__GNU__)
|
|
signal(SIGCHLD, SIG_DFL);
|
|
#endif
|
|
state = 0;
|
|
if (setjmp(jmploc.loc)) {
|
|
INTOFF;
|
|
/*
|
|
* When a shell procedure is executed, we raise the
|
|
* exception EXSHELLPROC to clean up before executing
|
|
* the shell procedure.
|
|
*/
|
|
if (exception == EXSHELLPROC) {
|
|
rootpid = getpid();
|
|
rootshell = 1;
|
|
minusc = NULL;
|
|
state = 3;
|
|
} else {
|
|
if (exception == EXEXEC) {
|
|
exitstatus = exerrno;
|
|
} else if (exception == EXERROR) {
|
|
exitstatus = 2;
|
|
}
|
|
if (state == 0 || iflag == 0 || ! rootshell)
|
|
exitshell(exitstatus);
|
|
}
|
|
reset();
|
|
if (exception == EXINT) {
|
|
out2c('\n');
|
|
}
|
|
popstackmark(&smark);
|
|
FORCEINTON; /* enable interrupts */
|
|
if (state == 1)
|
|
goto state1;
|
|
else if (state == 2)
|
|
goto state2;
|
|
else if (state == 3)
|
|
goto state3;
|
|
else
|
|
goto state4;
|
|
}
|
|
handler = &jmploc;
|
|
#ifdef DEBUG
|
|
opentrace();
|
|
trputs("Shell args: "); trargs(argv);
|
|
#endif
|
|
rootpid = getpid();
|
|
rootshell = 1;
|
|
init();
|
|
setstackmark(&smark);
|
|
procargs(argc, argv);
|
|
if (argv[0] && argv[0][0] == '-') {
|
|
state = 1;
|
|
read_profile("/etc/profile");
|
|
state1:
|
|
state = 2;
|
|
read_profile(".profile");
|
|
}
|
|
state2:
|
|
state = 3;
|
|
#ifndef linux
|
|
if (getuid() == geteuid() && getgid() == getegid()) {
|
|
#endif
|
|
if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
|
|
state = 3;
|
|
read_profile(shinit);
|
|
}
|
|
#ifndef linux
|
|
}
|
|
#endif
|
|
state3:
|
|
state = 4;
|
|
if (sflag == 0 || minusc) {
|
|
static const char sigs[] = {
|
|
SIGINT, SIGQUIT, SIGHUP,
|
|
#ifdef SIGTSTP
|
|
SIGTSTP,
|
|
#endif
|
|
SIGPIPE
|
|
};
|
|
#define SIGSSIZE ((sizeof(sigs)/sizeof(sigs[0])) - 1) /* trailing nul */
|
|
int i;
|
|
|
|
for (i = 0; i < SIGSSIZE; i++)
|
|
setsignal(sigs[i]);
|
|
}
|
|
|
|
if (minusc)
|
|
evalstring(minusc, 0);
|
|
|
|
if (sflag || minusc == NULL) {
|
|
state4: /* XXX ??? - why isn't this before the "if" statement */
|
|
cmdloop(1);
|
|
}
|
|
#if PROFILE
|
|
monitor(0);
|
|
#endif
|
|
exitshell(exitstatus);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
/*
|
|
* Read and execute commands. "Top" is nonzero for the top level command
|
|
* loop; it turns on prompting if the shell is interactive.
|
|
*/
|
|
|
|
static void
|
|
cmdloop(int top)
|
|
{
|
|
union node *n;
|
|
struct stackmark smark;
|
|
int inter;
|
|
int numeof = 0;
|
|
|
|
TRACE(("cmdloop(%d) called\n", top));
|
|
setstackmark(&smark);
|
|
for (;;) {
|
|
if (pendingsigs)
|
|
dotrap();
|
|
inter = 0;
|
|
if (iflag && top) {
|
|
inter++;
|
|
showjobs(1);
|
|
chkmail(0);
|
|
flushall();
|
|
}
|
|
n = parsecmd(inter);
|
|
/* showtree(n); DEBUG */
|
|
if (n == NEOF) {
|
|
if (!top || numeof >= 50)
|
|
break;
|
|
if (!stoppedjobs()) {
|
|
if (!Iflag)
|
|
break;
|
|
out2str("\nUse \"exit\" to leave shell.\n");
|
|
}
|
|
numeof++;
|
|
} else if (n != NULL && nflag == 0) {
|
|
job_warning = (job_warning == 2) ? 1 : 0;
|
|
numeof = 0;
|
|
evaltree(n, 0);
|
|
}
|
|
popstackmark(&smark);
|
|
setstackmark(&smark);
|
|
if (evalskip == SKIPFILE) {
|
|
evalskip = 0;
|
|
break;
|
|
}
|
|
}
|
|
popstackmark(&smark);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Read /etc/profile or .profile. Return on error.
|
|
*/
|
|
|
|
static void
|
|
read_profile(name)
|
|
const char *name;
|
|
{
|
|
int fd;
|
|
int xflag_save;
|
|
int vflag_save;
|
|
|
|
INTOFF;
|
|
if ((fd = open(name, O_RDONLY)) >= 0)
|
|
setinputfd(fd, 1);
|
|
INTON;
|
|
if (fd < 0)
|
|
return;
|
|
/* -q turns off -x and -v just when executing init files */
|
|
/* Note: Might do a little redundant work, but reduces code size. */
|
|
xflag_save = xflag;
|
|
vflag_save = vflag;
|
|
if (qflag) {
|
|
vflag = xflag = 0;
|
|
}
|
|
cmdloop(0);
|
|
xflag = xflag_save;
|
|
vflag = vflag_save;
|
|
popfile();
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Read a file containing shell functions.
|
|
*/
|
|
|
|
static void
|
|
readcmdfile(const char *name)
|
|
{
|
|
int fd;
|
|
|
|
INTOFF;
|
|
if ((fd = open(name, O_RDONLY)) >= 0)
|
|
setinputfd(fd, 1);
|
|
else
|
|
error("Can't open %s", name);
|
|
INTON;
|
|
cmdloop(0);
|
|
popfile();
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Take commands from a file. To be compatable we should do a path
|
|
* search for the file, which is necessary to find sub-commands.
|
|
*/
|
|
|
|
|
|
static inline char *
|
|
find_dot_file(char *mybasename)
|
|
{
|
|
char *fullname;
|
|
const char *path = pathval();
|
|
struct stat statb;
|
|
|
|
/* don't try this for absolute or relative paths */
|
|
if (strchr(mybasename, '/'))
|
|
return mybasename;
|
|
|
|
while ((fullname = padvance(&path, mybasename)) != NULL) {
|
|
if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
|
|
/*
|
|
* Don't bother freeing here, since it will
|
|
* be freed by the caller.
|
|
*/
|
|
return fullname;
|
|
}
|
|
stunalloc(fullname);
|
|
}
|
|
|
|
/* not found in the PATH */
|
|
error("%s: not found", mybasename);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static int
|
|
dotcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
struct strlist *sp;
|
|
exitstatus = 0;
|
|
|
|
for (sp = cmdenviron; sp ; sp = sp->next)
|
|
setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED);
|
|
|
|
if (argc >= 2) { /* That's what SVR2 does */
|
|
char *fullname;
|
|
struct stackmark smark;
|
|
|
|
setstackmark(&smark);
|
|
fullname = find_dot_file(argv[1]);
|
|
setinputfile(fullname, 1);
|
|
commandname = fullname;
|
|
cmdloop(0);
|
|
popfile();
|
|
popstackmark(&smark);
|
|
}
|
|
return exitstatus;
|
|
}
|
|
|
|
|
|
static int
|
|
exitcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
if (stoppedjobs())
|
|
return 0;
|
|
if (argc > 1)
|
|
exitstatus = number(argv[1]);
|
|
else
|
|
exitstatus = oexitstatus;
|
|
exitshell(exitstatus);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static pointer
|
|
stalloc(int nbytes)
|
|
{
|
|
char *p;
|
|
|
|
nbytes = ALIGN(nbytes);
|
|
if (nbytes > stacknleft) {
|
|
int blocksize;
|
|
struct stack_block *sp;
|
|
|
|
blocksize = nbytes;
|
|
if (blocksize < MINSIZE)
|
|
blocksize = MINSIZE;
|
|
INTOFF;
|
|
sp = ckmalloc(sizeof(struct stack_block) - MINSIZE + blocksize);
|
|
sp->prev = stackp;
|
|
stacknxt = sp->space;
|
|
stacknleft = blocksize;
|
|
stackp = sp;
|
|
INTON;
|
|
}
|
|
p = stacknxt;
|
|
stacknxt += nbytes;
|
|
stacknleft -= nbytes;
|
|
return p;
|
|
}
|
|
|
|
|
|
static void
|
|
stunalloc(pointer p)
|
|
{
|
|
#ifdef DEBUG
|
|
if (p == NULL) { /*DEBUG */
|
|
write(2, "stunalloc\n", 10);
|
|
abort();
|
|
}
|
|
#endif
|
|
if (!(stacknxt >= (char *)p && (char *)p >= stackp->space)) {
|
|
p = stackp->space;
|
|
}
|
|
stacknleft += stacknxt - (char *)p;
|
|
stacknxt = p;
|
|
}
|
|
|
|
|
|
static void
|
|
setstackmark(struct stackmark *mark)
|
|
{
|
|
mark->stackp = stackp;
|
|
mark->stacknxt = stacknxt;
|
|
mark->stacknleft = stacknleft;
|
|
mark->marknext = markp;
|
|
markp = mark;
|
|
}
|
|
|
|
|
|
static void
|
|
popstackmark(struct stackmark *mark)
|
|
{
|
|
struct stack_block *sp;
|
|
|
|
INTOFF;
|
|
markp = mark->marknext;
|
|
while (stackp != mark->stackp) {
|
|
sp = stackp;
|
|
stackp = sp->prev;
|
|
ckfree(sp);
|
|
}
|
|
stacknxt = mark->stacknxt;
|
|
stacknleft = mark->stacknleft;
|
|
INTON;
|
|
}
|
|
|
|
|
|
/*
|
|
* When the parser reads in a string, it wants to stick the string on the
|
|
* stack and only adjust the stack pointer when it knows how big the
|
|
* string is. Stackblock (defined in stack.h) returns a pointer to a block
|
|
* of space on top of the stack and stackblocklen returns the length of
|
|
* this block. Growstackblock will grow this space by at least one byte,
|
|
* possibly moving it (like realloc). Grabstackblock actually allocates the
|
|
* part of the block that has been used.
|
|
*/
|
|
|
|
static void
|
|
growstackblock(void) {
|
|
char *p;
|
|
int newlen = ALIGN(stacknleft * 2 + 100);
|
|
char *oldspace = stacknxt;
|
|
int oldlen = stacknleft;
|
|
struct stack_block *sp;
|
|
struct stack_block *oldstackp;
|
|
|
|
if (stacknxt == stackp->space && stackp != &stackbase) {
|
|
INTOFF;
|
|
oldstackp = stackp;
|
|
sp = stackp;
|
|
stackp = sp->prev;
|
|
sp = ckrealloc((pointer)sp, sizeof(struct stack_block) - MINSIZE + newlen);
|
|
sp->prev = stackp;
|
|
stackp = sp;
|
|
stacknxt = sp->space;
|
|
stacknleft = newlen;
|
|
{
|
|
/* Stack marks pointing to the start of the old block
|
|
* must be relocated to point to the new block
|
|
*/
|
|
struct stackmark *xmark;
|
|
xmark = markp;
|
|
while (xmark != NULL && xmark->stackp == oldstackp) {
|
|
xmark->stackp = stackp;
|
|
xmark->stacknxt = stacknxt;
|
|
xmark->stacknleft = stacknleft;
|
|
xmark = xmark->marknext;
|
|
}
|
|
}
|
|
INTON;
|
|
} else {
|
|
p = stalloc(newlen);
|
|
memcpy(p, oldspace, oldlen);
|
|
stacknxt = p; /* free the space */
|
|
stacknleft += newlen; /* we just allocated */
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static inline void
|
|
grabstackblock(int len)
|
|
{
|
|
len = ALIGN(len);
|
|
stacknxt += len;
|
|
stacknleft -= len;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* The following routines are somewhat easier to use that the above.
|
|
* The user declares a variable of type STACKSTR, which may be declared
|
|
* to be a register. The macro STARTSTACKSTR initializes things. Then
|
|
* the user uses the macro STPUTC to add characters to the string. In
|
|
* effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
|
|
* grown as necessary. When the user is done, she can just leave the
|
|
* string there and refer to it using stackblock(). Or she can allocate
|
|
* the space for it using grabstackstr(). If it is necessary to allow
|
|
* someone else to use the stack temporarily and then continue to grow
|
|
* the string, the user should use grabstack to allocate the space, and
|
|
* then call ungrabstr(p) to return to the previous mode of operation.
|
|
*
|
|
* USTPUTC is like STPUTC except that it doesn't check for overflow.
|
|
* CHECKSTACKSPACE can be called before USTPUTC to ensure that there
|
|
* is space for at least one character.
|
|
*/
|
|
|
|
|
|
static char *
|
|
growstackstr(void) {
|
|
int len = stackblocksize();
|
|
if (herefd >= 0 && len >= 1024) {
|
|
xwrite(herefd, stackblock(), len);
|
|
sstrnleft = len - 1;
|
|
return stackblock();
|
|
}
|
|
growstackblock();
|
|
sstrnleft = stackblocksize() - len - 1;
|
|
return stackblock() + len;
|
|
}
|
|
|
|
|
|
/*
|
|
* Called from CHECKSTRSPACE.
|
|
*/
|
|
|
|
static char *
|
|
makestrspace(size_t newlen) {
|
|
int len = stackblocksize() - sstrnleft;
|
|
do {
|
|
growstackblock();
|
|
sstrnleft = stackblocksize() - len;
|
|
} while (sstrnleft < newlen);
|
|
return stackblock() + len;
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
ungrabstackstr(char *s, char *p)
|
|
{
|
|
stacknleft += stacknxt - s;
|
|
stacknxt = s;
|
|
sstrnleft = stacknleft - (p - s);
|
|
}
|
|
/*
|
|
* Miscelaneous builtins.
|
|
*/
|
|
|
|
|
|
#undef rflag
|
|
|
|
#if !defined(__GLIBC__) || __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
|
|
typedef long rlim_t;
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
* The read builtin. The -e option causes backslashes to escape the
|
|
* following character.
|
|
*
|
|
* This uses unbuffered input, which may be avoidable in some cases.
|
|
*/
|
|
|
|
static int
|
|
readcmd(int argc, char **argv)
|
|
{
|
|
char **ap;
|
|
int backslash;
|
|
char c;
|
|
int rflag;
|
|
char *prompt;
|
|
const char *ifs;
|
|
char *p;
|
|
int startword;
|
|
int status;
|
|
int i;
|
|
|
|
rflag = 0;
|
|
prompt = NULL;
|
|
while ((i = nextopt("p:r")) != '\0') {
|
|
if (i == 'p')
|
|
prompt = optionarg;
|
|
else
|
|
rflag = 1;
|
|
}
|
|
if (prompt && isatty(0)) {
|
|
out2str(prompt); /* read without cmdedit */
|
|
flushall();
|
|
}
|
|
if (*(ap = argptr) == NULL)
|
|
error("arg count");
|
|
if ((ifs = bltinlookup("IFS")) == NULL)
|
|
ifs = defifs;
|
|
status = 0;
|
|
startword = 1;
|
|
backslash = 0;
|
|
STARTSTACKSTR(p);
|
|
for (;;) {
|
|
if (read(0, &c, 1) != 1) {
|
|
status = 1;
|
|
break;
|
|
}
|
|
if (c == '\0')
|
|
continue;
|
|
if (backslash) {
|
|
backslash = 0;
|
|
if (c != '\n')
|
|
STPUTC(c, p);
|
|
continue;
|
|
}
|
|
if (!rflag && c == '\\') {
|
|
backslash++;
|
|
continue;
|
|
}
|
|
if (c == '\n')
|
|
break;
|
|
if (startword && *ifs == ' ' && strchr(ifs, c)) {
|
|
continue;
|
|
}
|
|
startword = 0;
|
|
if (backslash && c == '\\') {
|
|
if (read(0, &c, 1) != 1) {
|
|
status = 1;
|
|
break;
|
|
}
|
|
STPUTC(c, p);
|
|
} else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
|
|
STACKSTRNUL(p);
|
|
setvar(*ap, stackblock(), 0);
|
|
ap++;
|
|
startword = 1;
|
|
STARTSTACKSTR(p);
|
|
} else {
|
|
STPUTC(c, p);
|
|
}
|
|
}
|
|
STACKSTRNUL(p);
|
|
/* Remove trailing blanks */
|
|
while (stackblock() <= --p && strchr(ifs, *p) != NULL)
|
|
*p = '\0';
|
|
setvar(*ap, stackblock(), 0);
|
|
while (*++ap != NULL)
|
|
setvar(*ap, nullstr, 0);
|
|
return status;
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
umaskcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
static const char permuser[3] = "ugo";
|
|
static const char permmode[3] = "rwx";
|
|
static const short int permmask[] = {
|
|
S_IRUSR, S_IWUSR, S_IXUSR,
|
|
S_IRGRP, S_IWGRP, S_IXGRP,
|
|
S_IROTH, S_IWOTH, S_IXOTH
|
|
};
|
|
|
|
char *ap;
|
|
mode_t mask;
|
|
int i;
|
|
int symbolic_mode = 0;
|
|
|
|
while (nextopt("S") != '\0') {
|
|
symbolic_mode = 1;
|
|
}
|
|
|
|
INTOFF;
|
|
mask = umask(0);
|
|
umask(mask);
|
|
INTON;
|
|
|
|
if ((ap = *argptr) == NULL) {
|
|
if (symbolic_mode) {
|
|
char buf[18];
|
|
char *p = buf;
|
|
for (i=0 ; i<3 ; i++) {
|
|
int j;
|
|
*p++ = permuser[i];
|
|
*p++ = '=';
|
|
for (j=0 ; j<3 ; j++) {
|
|
if ((mask & permmask[3*i+j]) == 0) {
|
|
*p++ = permmode[j];
|
|
}
|
|
}
|
|
*p++ = ',';
|
|
}
|
|
*--p = 0;
|
|
puts(buf);
|
|
} else {
|
|
printf("%.4o\n", mask);
|
|
}
|
|
} else {
|
|
if (is_digit((unsigned char)*ap)) {
|
|
mask = 0;
|
|
do {
|
|
if (*ap >= '8' || *ap < '0')
|
|
error("Illegal number: %s", argv[1]);
|
|
mask = (mask << 3) + (*ap - '0');
|
|
} while (*++ap != '\0');
|
|
umask(mask);
|
|
} else {
|
|
mask = ~mask & 0777;
|
|
if (parse_mode(ap, &mask) == FALSE) {
|
|
error("Illegal mode: %s", ap);
|
|
}
|
|
umask(~mask & 0777);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ulimit builtin
|
|
*
|
|
* This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
|
|
* Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
|
|
* ash by J.T. Conklin.
|
|
*
|
|
* Public domain.
|
|
*/
|
|
|
|
struct limits {
|
|
const char *name;
|
|
short cmd;
|
|
short factor; /* multiply by to get rlim_{cur,max} values */
|
|
};
|
|
|
|
static const struct limits limits[] = {
|
|
#ifdef RLIMIT_CPU
|
|
{ "time(seconds)", RLIMIT_CPU, 1 },
|
|
#endif
|
|
#ifdef RLIMIT_FSIZE
|
|
{ "file(blocks)", RLIMIT_FSIZE, 512 },
|
|
#endif
|
|
#ifdef RLIMIT_DATA
|
|
{ "data(kbytes)", RLIMIT_DATA, 1024 },
|
|
#endif
|
|
#ifdef RLIMIT_STACK
|
|
{ "stack(kbytes)", RLIMIT_STACK, 1024 },
|
|
#endif
|
|
#ifdef RLIMIT_CORE
|
|
{ "coredump(blocks)", RLIMIT_CORE, 512 },
|
|
#endif
|
|
#ifdef RLIMIT_RSS
|
|
{ "memory(kbytes)", RLIMIT_RSS, 1024 },
|
|
#endif
|
|
#ifdef RLIMIT_MEMLOCK
|
|
{ "locked memory(kbytes)", RLIMIT_MEMLOCK, 1024 },
|
|
#endif
|
|
#ifdef RLIMIT_NPROC
|
|
{ "process(processes)", RLIMIT_NPROC, 1 },
|
|
#endif
|
|
#ifdef RLIMIT_NOFILE
|
|
{ "nofiles(descriptors)", RLIMIT_NOFILE, 1 },
|
|
#endif
|
|
#ifdef RLIMIT_VMEM
|
|
{ "vmemory(kbytes)", RLIMIT_VMEM, 1024 },
|
|
#endif
|
|
#ifdef RLIMIT_SWAP
|
|
{ "swap(kbytes)", RLIMIT_SWAP, 1024 },
|
|
#endif
|
|
{ NULL, 0, 0 }
|
|
};
|
|
|
|
static int
|
|
ulimitcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
static const char unlimited_string[] = "unlimited";
|
|
int c;
|
|
rlim_t val = 0;
|
|
enum { SOFT = 0x1, HARD = 0x2 }
|
|
how = SOFT | HARD;
|
|
const struct limits *l;
|
|
int set, all = 0;
|
|
int optc, what;
|
|
struct rlimit limit;
|
|
|
|
what = 'f';
|
|
|
|
while ((optc = nextopt("HSa"
|
|
#ifdef RLIMIT_CPU
|
|
"t"
|
|
#endif
|
|
#ifdef RLIMIT_FSIZE
|
|
"f"
|
|
#endif
|
|
#ifdef RLIMIT_DATA
|
|
"d"
|
|
#endif
|
|
#ifdef RLIMIT_STACK
|
|
"s"
|
|
#endif
|
|
#ifdef RLIMIT_CORE
|
|
"c"
|
|
#endif
|
|
#ifdef RLIMIT_RSS
|
|
"m"
|
|
#endif
|
|
#ifdef RLIMIT_MEMLOCK
|
|
"l"
|
|
#endif
|
|
#ifdef RLIMIT_NPROC
|
|
"p"
|
|
#endif
|
|
#ifdef RLIMIT_NOFILE
|
|
"n"
|
|
#endif
|
|
#ifdef RLIMIT_VMEM
|
|
"v"
|
|
#endif
|
|
#ifdef RLIMIT_SWAP
|
|
"w"
|
|
#endif
|
|
)) != '\0') {
|
|
if (optc == 'H') {
|
|
how = HARD;
|
|
} else if (optc == 'S') {
|
|
how = SOFT;
|
|
} else if (optc == 'a') {
|
|
all = 1;
|
|
} else {
|
|
what = optc;
|
|
}
|
|
}
|
|
|
|
for (l = limits; l->name; l++) {
|
|
if(l->name[0] == what)
|
|
break;
|
|
if(l->name[1]=='w' && what=='w')
|
|
break;
|
|
}
|
|
|
|
set = *argptr ? 1 : 0;
|
|
if (set) {
|
|
char *p = *argptr;
|
|
|
|
if (all || argptr[1])
|
|
error("too many arguments");
|
|
if (strcmp(p, unlimited_string) == 0)
|
|
val = RLIM_INFINITY;
|
|
else {
|
|
val = (rlim_t) 0;
|
|
|
|
while ((c = *p++) >= '0' && c <= '9')
|
|
{
|
|
val = (val * 10) + (long)(c - '0');
|
|
if (val < (rlim_t) 0)
|
|
break;
|
|
}
|
|
if (c)
|
|
error("bad number");
|
|
val *= l->factor;
|
|
}
|
|
}
|
|
|
|
if (all) {
|
|
for (l = limits; l->name; l++) {
|
|
printf("%-20s ", l->name);
|
|
getrlimit(l->cmd, &limit);
|
|
OUTPUT_LIMIT:
|
|
if (how & SOFT)
|
|
val = limit.rlim_cur;
|
|
else if (how & HARD)
|
|
val = limit.rlim_max;
|
|
|
|
if (val == RLIM_INFINITY)
|
|
puts(unlimited_string);
|
|
else
|
|
{
|
|
val /= l->factor;
|
|
printf("%lld\n", (long long) val);
|
|
}
|
|
if (!all) {
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (!set) {
|
|
goto OUTPUT_LIMIT;
|
|
}
|
|
|
|
getrlimit(l->cmd, &limit);
|
|
if (how & HARD)
|
|
limit.rlim_max = val;
|
|
if (how & SOFT)
|
|
limit.rlim_cur = val;
|
|
if (setrlimit(l->cmd, &limit) < 0)
|
|
error("error setting limit (%m)");
|
|
return 0;
|
|
}
|
|
/*
|
|
* prefix -- see if pfx is a prefix of string.
|
|
*/
|
|
|
|
static int
|
|
prefix(char const *pfx, char const *string)
|
|
{
|
|
while (*pfx) {
|
|
if (*pfx++ != *string++)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Return true if s is a string of digits, and save munber in intptr
|
|
* nagative is bad
|
|
*/
|
|
|
|
static int
|
|
is_number(const char *p, int *intptr)
|
|
{
|
|
int ret = 0;
|
|
|
|
do {
|
|
if (! is_digit(*p))
|
|
return 0;
|
|
ret *= 10;
|
|
ret += digit_val(*p);
|
|
p++;
|
|
} while (*p != '\0');
|
|
|
|
*intptr = ret;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Convert a string of digits to an integer, printing an error message on
|
|
* failure.
|
|
*/
|
|
|
|
static int
|
|
number(const char *s)
|
|
{
|
|
int i;
|
|
if (! is_number(s, &i))
|
|
error("Illegal number: %s", s);
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* Produce a possibly single quoted string suitable as input to the shell.
|
|
* The return string is allocated on the stack.
|
|
*/
|
|
|
|
static char *
|
|
single_quote(const char *s) {
|
|
char *p;
|
|
|
|
STARTSTACKSTR(p);
|
|
|
|
do {
|
|
char *q = p;
|
|
size_t len1, len1p, len2, len2p;
|
|
|
|
len1 = strcspn(s, "'");
|
|
len2 = strspn(s + len1, "'");
|
|
|
|
len1p = len1 ? len1 + 2 : len1;
|
|
len2p = len2 + ((len2 < 2) ? len2 : 2);
|
|
|
|
CHECKSTRSPACE(len1p + len2p + 1, p);
|
|
|
|
if (len1) {
|
|
*p = '\'';
|
|
q = p + 1 + len1;
|
|
memcpy(p + 1, s, len1);
|
|
*q++ = '\'';
|
|
s += len1;
|
|
}
|
|
|
|
if (len2 > 1) {
|
|
*q = '"';
|
|
q += 1 + len2;
|
|
memcpy(q + 1, s, len2);
|
|
*q = '"';
|
|
s += len2;
|
|
} else if (len2 == 1) {
|
|
*q++ = '\\';
|
|
*q = '\'';
|
|
s++;
|
|
}
|
|
|
|
STADJUST(len1p + len2p, p);
|
|
} while (*s);
|
|
|
|
USTPUTC(0, p);
|
|
|
|
return grabstackstr(p);
|
|
}
|
|
|
|
/*
|
|
* Like strdup but works with the ash stack.
|
|
*/
|
|
|
|
static char *
|
|
sstrdup(const char *p)
|
|
{
|
|
size_t len = strlen(p) + 1;
|
|
return memcpy(stalloc(len), p, len);
|
|
}
|
|
|
|
|
|
/*
|
|
* Routine for dealing with parsed shell commands.
|
|
*/
|
|
|
|
|
|
static void sizenodelist (const struct nodelist *);
|
|
static struct nodelist *copynodelist (const struct nodelist *);
|
|
static char *nodesavestr (const char *);
|
|
|
|
#define CALCSIZE_TABLE
|
|
#define COPYNODE_TABLE
|
|
#if defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE)
|
|
/*
|
|
* To collect a lot of redundant code in case statements for copynode()
|
|
* and calcsize(), we implement a mini language here. Each type of node
|
|
* struct has an associated instruction sequence that operates on its
|
|
* members via their offsets. The instruction are pack in unsigned chars
|
|
* with format IIDDDDDE where the bits are
|
|
* I : part of the instruction opcode, which are
|
|
* 00 : member is a pointer to another node
|
|
* 40 : member is an integer
|
|
* 80 : member is a pointer to a nodelist
|
|
* CC : member is a pointer to a char string
|
|
* D : data - the actual offset of the member to operate on in the struct
|
|
* (since we assume bit 0 is set, it is not shifted)
|
|
* E : flag signaling end of instruction sequence
|
|
*
|
|
* WARNING: In order to handle larger offsets for 64bit archs, this code
|
|
* assumes that no offset can be an odd number and stores the
|
|
* end-of-instructions flag in bit 0.
|
|
*/
|
|
|
|
#define NODE_INTEGER 0x40
|
|
#define NODE_NODELIST 0x80
|
|
#define NODE_CHARPTR 0xC0
|
|
#define NODE_NOMORE 0x01 /* Note: no offset should be odd (aligned)*/
|
|
#define NODE_MBRMASK 0xC0
|
|
#define NODE_OFFSETMASK 0x3E
|
|
|
|
static const unsigned char copynode_ops[35] = {
|
|
#define COPYNODE_OPS0 0
|
|
offsetof(union node, nbinary.ch2),
|
|
offsetof(union node, nbinary.ch1)|NODE_NOMORE,
|
|
#define COPYNODE_OPS1 (COPYNODE_OPS0 + 2)
|
|
offsetof(union node, ncmd.redirect),
|
|
offsetof(union node, ncmd.args),
|
|
offsetof(union node, ncmd.assign),
|
|
offsetof(union node, ncmd.backgnd)|NODE_INTEGER|NODE_NOMORE,
|
|
#define COPYNODE_OPS2 (COPYNODE_OPS1 + 4)
|
|
offsetof(union node, npipe.cmdlist)|NODE_NODELIST,
|
|
offsetof(union node, npipe.backgnd)|NODE_INTEGER|NODE_NOMORE,
|
|
#define COPYNODE_OPS3 (COPYNODE_OPS2 + 2)
|
|
offsetof(union node, nredir.redirect),
|
|
offsetof(union node, nredir.n)|NODE_NOMORE,
|
|
#define COPYNODE_OPS4 (COPYNODE_OPS3 + 2)
|
|
offsetof(union node, nif.elsepart),
|
|
offsetof(union node, nif.ifpart),
|
|
offsetof(union node, nif.test)|NODE_NOMORE,
|
|
#define COPYNODE_OPS5 (COPYNODE_OPS4 + 3)
|
|
offsetof(union node, nfor.var)|NODE_CHARPTR,
|
|
offsetof(union node, nfor.body),
|
|
offsetof(union node, nfor.args)|NODE_NOMORE,
|
|
#define COPYNODE_OPS6 (COPYNODE_OPS5 + 3)
|
|
offsetof(union node, ncase.cases),
|
|
offsetof(union node, ncase.expr)|NODE_NOMORE,
|
|
#define COPYNODE_OPS7 (COPYNODE_OPS6 + 2)
|
|
offsetof(union node, nclist.body),
|
|
offsetof(union node, nclist.pattern),
|
|
offsetof(union node, nclist.next)|NODE_NOMORE,
|
|
#define COPYNODE_OPS8 (COPYNODE_OPS7 + 3)
|
|
offsetof(union node, narg.backquote)|NODE_NODELIST,
|
|
offsetof(union node, narg.text)|NODE_CHARPTR,
|
|
offsetof(union node, narg.next)|NODE_NOMORE,
|
|
#define COPYNODE_OPS9 (COPYNODE_OPS8 + 3)
|
|
offsetof(union node, nfile.fname),
|
|
offsetof(union node, nfile.fd)|NODE_INTEGER,
|
|
offsetof(union node, nfile.next)|NODE_NOMORE,
|
|
#define COPYNODE_OPS10 (COPYNODE_OPS9 + 3)
|
|
offsetof(union node, ndup.vname),
|
|
offsetof(union node, ndup.dupfd)|NODE_INTEGER,
|
|
offsetof(union node, ndup.fd)|NODE_INTEGER,
|
|
offsetof(union node, ndup.next)|NODE_NOMORE,
|
|
#define COPYNODE_OPS11 (COPYNODE_OPS10 + 4)
|
|
offsetof(union node, nhere.doc),
|
|
offsetof(union node, nhere.fd)|NODE_INTEGER,
|
|
offsetof(union node, nhere.next)|NODE_NOMORE,
|
|
#define COPYNODE_OPS12 (COPYNODE_OPS11 + 3)
|
|
offsetof(union node, nnot.com)|NODE_NOMORE,
|
|
};
|
|
|
|
#if COPYNODE_OPS12 != 34
|
|
#error COPYNODE_OPS12 is incorrect
|
|
#endif
|
|
|
|
static const unsigned char copynode_ops_index[26] = {
|
|
COPYNODE_OPS0, /* NSEMI */
|
|
COPYNODE_OPS1, /* NCMD */
|
|
COPYNODE_OPS2, /* NPIPE */
|
|
COPYNODE_OPS3, /* NREDIR */
|
|
COPYNODE_OPS3, /* NBACKGND */
|
|
COPYNODE_OPS3, /* NSUBSHELL */
|
|
COPYNODE_OPS0, /* NAND */
|
|
COPYNODE_OPS0, /* NOR */
|
|
COPYNODE_OPS4, /* NIF */
|
|
COPYNODE_OPS0, /* NWHILE */
|
|
COPYNODE_OPS0, /* NUNTIL */
|
|
COPYNODE_OPS5, /* NFOR */
|
|
COPYNODE_OPS6, /* NCASE */
|
|
COPYNODE_OPS7, /* NCLIST */
|
|
COPYNODE_OPS8, /* NDEFUN */
|
|
COPYNODE_OPS8, /* NARG */
|
|
COPYNODE_OPS9, /* NTO */
|
|
COPYNODE_OPS9, /* NFROM */
|
|
COPYNODE_OPS9, /* NFROMTO */
|
|
COPYNODE_OPS9, /* NAPPEND */
|
|
COPYNODE_OPS9, /* NTOOV */
|
|
COPYNODE_OPS10, /* NTOFD */
|
|
COPYNODE_OPS10, /* NFROMFD */
|
|
COPYNODE_OPS11, /* NHERE */
|
|
COPYNODE_OPS11, /* NXHERE */
|
|
COPYNODE_OPS12, /* NNOT */
|
|
};
|
|
|
|
#if NODE_CHARPTR != NODE_MBRMASK
|
|
#error NODE_CHARPTR != NODE_MBRMASK!!!
|
|
#endif
|
|
#endif /* defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE) */
|
|
|
|
#ifdef COPYNODE_TABLE
|
|
static union node *
|
|
copynode(const union node *n)
|
|
{
|
|
union node *new;
|
|
const unsigned char *p;
|
|
|
|
if (n == NULL) {
|
|
return NULL;
|
|
}
|
|
new = funcblock;
|
|
new->type = n->type;
|
|
funcblock = (char *) funcblock + (int) nodesize[n->type];
|
|
p = copynode_ops + (int) copynode_ops_index[n->type];
|
|
do {
|
|
char *nn = ((char *) new) + ((int)(*p & NODE_OFFSETMASK));
|
|
const char *no = ((const char *) n) + ((int)(*p & NODE_OFFSETMASK));
|
|
|
|
if (!(*p & NODE_MBRMASK)) { /* standard node */
|
|
*((union node **)nn) = copynode(*((const union node **) no));
|
|
} else if ((*p & NODE_MBRMASK) == NODE_CHARPTR) { /* string */
|
|
*((const char **)nn) = nodesavestr(*((const char **)no));
|
|
} else if (*p & NODE_NODELIST) { /* nodelist */
|
|
*((struct nodelist **)nn)
|
|
= copynodelist(*((const struct nodelist **) no));
|
|
} else { /* integer */
|
|
*((int *) nn) = *((int *) no);
|
|
}
|
|
} while (!(*p++ & NODE_NOMORE));
|
|
return new;
|
|
}
|
|
#else /* COPYNODE_TABLE */
|
|
static union node *
|
|
copynode(const union node *n)
|
|
{
|
|
union node *new;
|
|
|
|
if (n == NULL)
|
|
return NULL;
|
|
new = funcblock;
|
|
funcblock = (char *) funcblock + nodesize[n->type];
|
|
switch (n->type) {
|
|
case NSEMI:
|
|
case NAND:
|
|
case NOR:
|
|
case NWHILE:
|
|
case NUNTIL:
|
|
new->nbinary.ch2 = copynode(n->nbinary.ch2);
|
|
new->nbinary.ch1 = copynode(n->nbinary.ch1);
|
|
break;
|
|
case NCMD:
|
|
new->ncmd.redirect = copynode(n->ncmd.redirect);
|
|
new->ncmd.args = copynode(n->ncmd.args);
|
|
new->ncmd.assign = copynode(n->ncmd.assign);
|
|
new->ncmd.backgnd = n->ncmd.backgnd;
|
|
break;
|
|
case NPIPE:
|
|
new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
|
|
new->npipe.backgnd = n->npipe.backgnd;
|
|
break;
|
|
case NREDIR:
|
|
case NBACKGND:
|
|
case NSUBSHELL:
|
|
new->nredir.redirect = copynode(n->nredir.redirect);
|
|
new->nredir.n = copynode(n->nredir.n);
|
|
break;
|
|
case NIF:
|
|
new->nif.elsepart = copynode(n->nif.elsepart);
|
|
new->nif.ifpart = copynode(n->nif.ifpart);
|
|
new->nif.test = copynode(n->nif.test);
|
|
break;
|
|
case NFOR:
|
|
new->nfor.var = nodesavestr(n->nfor.var);
|
|
new->nfor.body = copynode(n->nfor.body);
|
|
new->nfor.args = copynode(n->nfor.args);
|
|
break;
|
|
case NCASE:
|
|
new->ncase.cases = copynode(n->ncase.cases);
|
|
new->ncase.expr = copynode(n->ncase.expr);
|
|
break;
|
|
case NCLIST:
|
|
new->nclist.body = copynode(n->nclist.body);
|
|
new->nclist.pattern = copynode(n->nclist.pattern);
|
|
new->nclist.next = copynode(n->nclist.next);
|
|
break;
|
|
case NDEFUN:
|
|
case NARG:
|
|
new->narg.backquote = copynodelist(n->narg.backquote);
|
|
new->narg.text = nodesavestr(n->narg.text);
|
|
new->narg.next = copynode(n->narg.next);
|
|
break;
|
|
case NTO:
|
|
case NFROM:
|
|
case NFROMTO:
|
|
case NAPPEND:
|
|
case NTOOV:
|
|
new->nfile.fname = copynode(n->nfile.fname);
|
|
new->nfile.fd = n->nfile.fd;
|
|
new->nfile.next = copynode(n->nfile.next);
|
|
break;
|
|
case NTOFD:
|
|
case NFROMFD:
|
|
new->ndup.vname = copynode(n->ndup.vname);
|
|
new->ndup.dupfd = n->ndup.dupfd;
|
|
new->ndup.fd = n->ndup.fd;
|
|
new->ndup.next = copynode(n->ndup.next);
|
|
break;
|
|
case NHERE:
|
|
case NXHERE:
|
|
new->nhere.doc = copynode(n->nhere.doc);
|
|
new->nhere.fd = n->nhere.fd;
|
|
new->nhere.next = copynode(n->nhere.next);
|
|
break;
|
|
case NNOT:
|
|
new->nnot.com = copynode(n->nnot.com);
|
|
break;
|
|
};
|
|
new->type = n->type;
|
|
return new;
|
|
}
|
|
#endif /* COPYNODE_TABLE */
|
|
|
|
#ifdef CALCSIZE_TABLE
|
|
static void
|
|
calcsize(const union node *n)
|
|
{
|
|
const unsigned char *p;
|
|
|
|
if (n == NULL)
|
|
return;
|
|
funcblocksize += (int) nodesize[n->type];
|
|
|
|
p = copynode_ops + (int) copynode_ops_index[n->type];
|
|
do {
|
|
const char *no = ((const char *) n) + ((int)(*p & NODE_OFFSETMASK));
|
|
|
|
if (!(*p & NODE_MBRMASK)) { /* standard node */
|
|
calcsize(*((const union node **) no));
|
|
} else if ((*p & NODE_MBRMASK) == NODE_CHARPTR) { /* string */
|
|
funcstringsize += strlen(*((const char **)no)) + 1;
|
|
} else if (*p & NODE_NODELIST) { /* nodelist */
|
|
sizenodelist(*((const struct nodelist **) no));
|
|
} /* else integer -- ignore */
|
|
} while (!(*p++ & NODE_NOMORE));
|
|
}
|
|
#else /* CALCSIZE_TABLE */
|
|
static void
|
|
calcsize(const union node *n)
|
|
{
|
|
if (n == NULL)
|
|
return;
|
|
funcblocksize += nodesize[n->type];
|
|
switch (n->type) {
|
|
case NSEMI:
|
|
case NAND:
|
|
case NOR:
|
|
case NWHILE:
|
|
case NUNTIL:
|
|
calcsize(n->nbinary.ch2);
|
|
calcsize(n->nbinary.ch1);
|
|
break;
|
|
case NCMD:
|
|
calcsize(n->ncmd.redirect);
|
|
calcsize(n->ncmd.args);
|
|
calcsize(n->ncmd.assign);
|
|
break;
|
|
case NPIPE:
|
|
sizenodelist(n->npipe.cmdlist);
|
|
break;
|
|
case NREDIR:
|
|
case NBACKGND:
|
|
case NSUBSHELL:
|
|
calcsize(n->nredir.redirect);
|
|
calcsize(n->nredir.n);
|
|
break;
|
|
case NIF:
|
|
calcsize(n->nif.elsepart);
|
|
calcsize(n->nif.ifpart);
|
|
calcsize(n->nif.test);
|
|
break;
|
|
case NFOR:
|
|
funcstringsize += strlen(n->nfor.var) + 1;
|
|
calcsize(n->nfor.body);
|
|
calcsize(n->nfor.args);
|
|
break;
|
|
case NCASE:
|
|
calcsize(n->ncase.cases);
|
|
calcsize(n->ncase.expr);
|
|
break;
|
|
case NCLIST:
|
|
calcsize(n->nclist.body);
|
|
calcsize(n->nclist.pattern);
|
|
calcsize(n->nclist.next);
|
|
break;
|
|
case NDEFUN:
|
|
case NARG:
|
|
sizenodelist(n->narg.backquote);
|
|
funcstringsize += strlen(n->narg.text) + 1;
|
|
calcsize(n->narg.next);
|
|
break;
|
|
case NTO:
|
|
case NFROM:
|
|
case NFROMTO:
|
|
case NAPPEND:
|
|
case NTOOV:
|
|
calcsize(n->nfile.fname);
|
|
calcsize(n->nfile.next);
|
|
break;
|
|
case NTOFD:
|
|
case NFROMFD:
|
|
calcsize(n->ndup.vname);
|
|
calcsize(n->ndup.next);
|
|
break;
|
|
case NHERE:
|
|
case NXHERE:
|
|
calcsize(n->nhere.doc);
|
|
calcsize(n->nhere.next);
|
|
break;
|
|
case NNOT:
|
|
calcsize(n->nnot.com);
|
|
break;
|
|
};
|
|
}
|
|
#endif /* CALCSIZE_TABLE */
|
|
|
|
static void
|
|
sizenodelist(const struct nodelist *lp)
|
|
{
|
|
while (lp) {
|
|
funcblocksize += ALIGN(sizeof(struct nodelist));
|
|
calcsize(lp->n);
|
|
lp = lp->next;
|
|
}
|
|
}
|
|
|
|
|
|
static struct nodelist *
|
|
copynodelist(const struct nodelist *lp)
|
|
{
|
|
struct nodelist *start;
|
|
struct nodelist **lpp;
|
|
|
|
lpp = &start;
|
|
while (lp) {
|
|
*lpp = funcblock;
|
|
funcblock = (char *) funcblock + ALIGN(sizeof(struct nodelist));
|
|
(*lpp)->n = copynode(lp->n);
|
|
lp = lp->next;
|
|
lpp = &(*lpp)->next;
|
|
}
|
|
*lpp = NULL;
|
|
return start;
|
|
}
|
|
|
|
|
|
static char *
|
|
nodesavestr(const char *s)
|
|
{
|
|
const char *p = s;
|
|
char *q = funcstring;
|
|
char *rtn = funcstring;
|
|
|
|
while ((*q++ = *p++) != '\0')
|
|
continue;
|
|
funcstring = q;
|
|
return rtn;
|
|
}
|
|
|
|
#ifdef ASH_GETOPTS
|
|
static int getopts (char *, char *, char **, int *, int *);
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Process the shell command line arguments.
|
|
*/
|
|
|
|
static void
|
|
procargs(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
int i;
|
|
|
|
argptr = argv;
|
|
if (argc > 0)
|
|
argptr++;
|
|
for (i = 0; i < NOPTS; i++)
|
|
optent_val(i) = 2;
|
|
options(1);
|
|
if (*argptr == NULL && minusc == NULL)
|
|
sflag = 1;
|
|
if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
|
|
iflag = 1;
|
|
if (mflag == 2)
|
|
mflag = iflag;
|
|
for (i = 0; i < NOPTS; i++)
|
|
if (optent_val(i) == 2)
|
|
optent_val(i) = 0;
|
|
arg0 = argv[0];
|
|
if (sflag == 0 && minusc == NULL) {
|
|
commandname = argv[0];
|
|
arg0 = *argptr++;
|
|
setinputfile(arg0, 0);
|
|
commandname = arg0;
|
|
}
|
|
/* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
|
|
if (argptr && minusc && *argptr)
|
|
arg0 = *argptr++;
|
|
|
|
shellparam.p = argptr;
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
|
|
while (*argptr) {
|
|
shellparam.nparam++;
|
|
argptr++;
|
|
}
|
|
optschanged();
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Process shell options. The global variable argptr contains a pointer
|
|
* to the argument list; we advance it past the options.
|
|
*/
|
|
|
|
static inline void
|
|
minus_o(const char *name, int val)
|
|
{
|
|
int i;
|
|
|
|
if (name == NULL) {
|
|
out1str("Current option settings\n");
|
|
for (i = 0; i < NOPTS; i++)
|
|
printf("%-16s%s\n", optent_name(optlist[i]),
|
|
optent_val(i) ? "on" : "off");
|
|
} else {
|
|
for (i = 0; i < NOPTS; i++)
|
|
if (equal(name, optent_name(optlist[i]))) {
|
|
setoption(optent_letter(optlist[i]), val);
|
|
return;
|
|
}
|
|
error("Illegal option -o %s", name);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
options(int cmdline)
|
|
{
|
|
char *p;
|
|
int val;
|
|
int c;
|
|
|
|
if (cmdline)
|
|
minusc = NULL;
|
|
while ((p = *argptr) != NULL) {
|
|
argptr++;
|
|
if ((c = *p++) == '-') {
|
|
val = 1;
|
|
if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
|
|
if (!cmdline) {
|
|
/* "-" means turn off -x and -v */
|
|
if (p[0] == '\0')
|
|
xflag = vflag = 0;
|
|
/* "--" means reset params */
|
|
else if (*argptr == NULL)
|
|
setparam(argptr);
|
|
}
|
|
break; /* "-" or "--" terminates options */
|
|
}
|
|
} else if (c == '+') {
|
|
val = 0;
|
|
} else {
|
|
argptr--;
|
|
break;
|
|
}
|
|
while ((c = *p++) != '\0') {
|
|
if (c == 'c' && cmdline) {
|
|
char *q;
|
|
#ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
|
|
if (*p == '\0')
|
|
#endif
|
|
q = *argptr++;
|
|
if (q == NULL || minusc != NULL)
|
|
error("Bad -c option");
|
|
minusc = q;
|
|
#ifdef NOHACK
|
|
break;
|
|
#endif
|
|
} else if (c == 'o') {
|
|
minus_o(*argptr, val);
|
|
if (*argptr)
|
|
argptr++;
|
|
} else {
|
|
setoption(c, val);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
setoption(int flag, int val)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NOPTS; i++)
|
|
if (optent_letter(optlist[i]) == flag) {
|
|
optent_val(i) = val;
|
|
if (val) {
|
|
/* #%$ hack for ksh semantics */
|
|
if (flag == 'V')
|
|
Eflag = 0;
|
|
else if (flag == 'E')
|
|
Vflag = 0;
|
|
}
|
|
return;
|
|
}
|
|
error("Illegal option -%c", flag);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Set the shell parameters.
|
|
*/
|
|
|
|
static void
|
|
setparam(char **argv)
|
|
{
|
|
char **newparam;
|
|
char **ap;
|
|
int nparam;
|
|
|
|
for (nparam = 0 ; argv[nparam] ; nparam++);
|
|
ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
|
|
while (*argv) {
|
|
*ap++ = savestr(*argv++);
|
|
}
|
|
*ap = NULL;
|
|
freeparam(&shellparam);
|
|
shellparam.malloc = 1;
|
|
shellparam.nparam = nparam;
|
|
shellparam.p = newparam;
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Free the list of positional parameters.
|
|
*/
|
|
|
|
static void
|
|
freeparam(volatile struct shparam *param)
|
|
{
|
|
char **ap;
|
|
|
|
if (param->malloc) {
|
|
for (ap = param->p ; *ap ; ap++)
|
|
ckfree(*ap);
|
|
ckfree(param->p);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* The shift builtin command.
|
|
*/
|
|
|
|
static int
|
|
shiftcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
int n;
|
|
char **ap1, **ap2;
|
|
|
|
n = 1;
|
|
if (argc > 1)
|
|
n = number(argv[1]);
|
|
if (n > shellparam.nparam)
|
|
error("can't shift that many");
|
|
INTOFF;
|
|
shellparam.nparam -= n;
|
|
for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
|
|
if (shellparam.malloc)
|
|
ckfree(*ap1);
|
|
}
|
|
ap2 = shellparam.p;
|
|
while ((*ap2++ = *ap1++) != NULL);
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
INTON;
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* The set command builtin.
|
|
*/
|
|
|
|
static int
|
|
setcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
if (argc == 1)
|
|
return showvarscmd(argc, argv);
|
|
INTOFF;
|
|
options(0);
|
|
optschanged();
|
|
if (*argptr != NULL) {
|
|
setparam(argptr);
|
|
}
|
|
INTON;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void
|
|
getoptsreset(const char *value)
|
|
{
|
|
shellparam.optind = number(value);
|
|
shellparam.optoff = -1;
|
|
}
|
|
|
|
#ifdef BB_LOCALE_SUPPORT
|
|
static void change_lc_all(const char *value)
|
|
{
|
|
if(value != 0 && *value != 0)
|
|
setlocale(LC_ALL, value);
|
|
}
|
|
|
|
static void change_lc_ctype(const char *value)
|
|
{
|
|
if(value != 0 && *value != 0)
|
|
setlocale(LC_CTYPE, value);
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef ASH_GETOPTS
|
|
/*
|
|
* The getopts builtin. Shellparam.optnext points to the next argument
|
|
* to be processed. Shellparam.optptr points to the next character to
|
|
* be processed in the current argument. If shellparam.optnext is NULL,
|
|
* then it's the first time getopts has been called.
|
|
*/
|
|
|
|
static int
|
|
getoptscmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
char **optbase;
|
|
|
|
if (argc < 3)
|
|
error("Usage: getopts optstring var [arg]");
|
|
else if (argc == 3) {
|
|
optbase = shellparam.p;
|
|
if (shellparam.optind > shellparam.nparam + 1) {
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
}
|
|
}
|
|
else {
|
|
optbase = &argv[3];
|
|
if (shellparam.optind > argc - 2) {
|
|
shellparam.optind = 1;
|
|
shellparam.optoff = -1;
|
|
}
|
|
}
|
|
|
|
return getopts(argv[1], argv[2], optbase, &shellparam.optind,
|
|
&shellparam.optoff);
|
|
}
|
|
|
|
/*
|
|
* Safe version of setvar, returns 1 on success 0 on failure.
|
|
*/
|
|
|
|
static int
|
|
setvarsafe(name, val, flags)
|
|
const char *name, *val;
|
|
int flags;
|
|
{
|
|
struct jmploc jmploc;
|
|
struct jmploc *volatile savehandler = handler;
|
|
int err = 0;
|
|
#ifdef __GNUC__
|
|
(void) &err;
|
|
#endif
|
|
|
|
if (setjmp(jmploc.loc))
|
|
err = 1;
|
|
else {
|
|
handler = &jmploc;
|
|
setvar(name, val, flags);
|
|
}
|
|
handler = savehandler;
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
getopts(optstr, optvar, optfirst, myoptind, optoff)
|
|
char *optstr;
|
|
char *optvar;
|
|
char **optfirst;
|
|
int *myoptind;
|
|
int *optoff;
|
|
{
|
|
char *p, *q;
|
|
char c = '?';
|
|
int done = 0;
|
|
int err = 0;
|
|
char s[10];
|
|
char **optnext = optfirst + *myoptind - 1;
|
|
|
|
if (*myoptind <= 1 || *optoff < 0 || !(*(optnext - 1)) ||
|
|
strlen(*(optnext - 1)) < *optoff)
|
|
p = NULL;
|
|
else
|
|
p = *(optnext - 1) + *optoff;
|
|
if (p == NULL || *p == '\0') {
|
|
/* Current word is done, advance */
|
|
if (optnext == NULL)
|
|
return 1;
|
|
p = *optnext;
|
|
if (p == NULL || *p != '-' || *++p == '\0') {
|
|
atend:
|
|
*myoptind = optnext - optfirst + 1;
|
|
p = NULL;
|
|
done = 1;
|
|
goto out;
|
|
}
|
|
optnext++;
|
|
if (p[0] == '-' && p[1] == '\0') /* check for "--" */
|
|
goto atend;
|
|
}
|
|
|
|
c = *p++;
|
|
for (q = optstr; *q != c; ) {
|
|
if (*q == '\0') {
|
|
if (optstr[0] == ':') {
|
|
s[0] = c;
|
|
s[1] = '\0';
|
|
err |= setvarsafe("OPTARG", s, 0);
|
|
}
|
|
else {
|
|
out2fmt("Illegal option -%c\n", c);
|
|
(void) unsetvar("OPTARG");
|
|
}
|
|
c = '?';
|
|
goto bad;
|
|
}
|
|
if (*++q == ':')
|
|
q++;
|
|
}
|
|
|
|
if (*++q == ':') {
|
|
if (*p == '\0' && (p = *optnext) == NULL) {
|
|
if (optstr[0] == ':') {
|
|
s[0] = c;
|
|
s[1] = '\0';
|
|
err |= setvarsafe("OPTARG", s, 0);
|
|
c = ':';
|
|
}
|
|
else {
|
|
out2fmt("No arg for -%c option\n", c);
|
|
(void) unsetvar("OPTARG");
|
|
c = '?';
|
|
}
|
|
goto bad;
|
|
}
|
|
|
|
if (p == *optnext)
|
|
optnext++;
|
|
setvarsafe("OPTARG", p, 0);
|
|
p = NULL;
|
|
}
|
|
else
|
|
setvarsafe("OPTARG", "", 0);
|
|
*myoptind = optnext - optfirst + 1;
|
|
goto out;
|
|
|
|
bad:
|
|
*myoptind = 1;
|
|
p = NULL;
|
|
out:
|
|
*optoff = p ? p - *(optnext - 1) : -1;
|
|
snprintf(s, sizeof(s), "%d", *myoptind);
|
|
err |= setvarsafe("OPTIND", s, VNOFUNC);
|
|
s[0] = c;
|
|
s[1] = '\0';
|
|
err |= setvarsafe(optvar, s, 0);
|
|
if (err) {
|
|
*myoptind = 1;
|
|
*optoff = -1;
|
|
exraise(EXERROR);
|
|
}
|
|
return done;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* XXX - should get rid of. have all builtins use getopt(3). the
|
|
* library getopt must have the BSD extension static variable "optreset"
|
|
* otherwise it can't be used within the shell safely.
|
|
*
|
|
* Standard option processing (a la getopt) for builtin routines. The
|
|
* only argument that is passed to nextopt is the option string; the
|
|
* other arguments are unnecessary. It return the character, or '\0' on
|
|
* end of input.
|
|
*/
|
|
|
|
static int
|
|
nextopt(const char *optstring)
|
|
{
|
|
char *p;
|
|
const char *q;
|
|
char c;
|
|
|
|
if ((p = optptr) == NULL || *p == '\0') {
|
|
p = *argptr;
|
|
if (p == NULL || *p != '-' || *++p == '\0')
|
|
return '\0';
|
|
argptr++;
|
|
if (p[0] == '-' && p[1] == '\0') /* check for "--" */
|
|
return '\0';
|
|
}
|
|
c = *p++;
|
|
for (q = optstring ; *q != c ; ) {
|
|
if (*q == '\0')
|
|
error("Illegal option -%c", c);
|
|
if (*++q == ':')
|
|
q++;
|
|
}
|
|
if (*++q == ':') {
|
|
if (*p == '\0' && (p = *argptr++) == NULL)
|
|
error("No arg for -%c option", c);
|
|
optionarg = p;
|
|
p = NULL;
|
|
}
|
|
optptr = p;
|
|
return c;
|
|
}
|
|
|
|
static void
|
|
flushall() {
|
|
INTOFF;
|
|
fflush(stdout);
|
|
INTON;
|
|
}
|
|
|
|
|
|
static void
|
|
out2fmt(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
va_start(ap, fmt);
|
|
vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
|
|
/*
|
|
* Version of write which resumes after a signal is caught.
|
|
*/
|
|
|
|
static int
|
|
xwrite(int fd, const char *buf, int nbytes)
|
|
{
|
|
int ntry;
|
|
int i;
|
|
int n;
|
|
|
|
n = nbytes;
|
|
ntry = 0;
|
|
for (;;) {
|
|
i = write(fd, buf, n);
|
|
if (i > 0) {
|
|
if ((n -= i) <= 0)
|
|
return nbytes;
|
|
buf += i;
|
|
ntry = 0;
|
|
} else if (i == 0) {
|
|
if (++ntry > 10)
|
|
return nbytes - n;
|
|
} else if (errno != EINTR) {
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Shell command parser.
|
|
*/
|
|
|
|
#define EOFMARKLEN 79
|
|
|
|
|
|
|
|
struct heredoc {
|
|
struct heredoc *next; /* next here document in list */
|
|
union node *here; /* redirection node */
|
|
char *eofmark; /* string indicating end of input */
|
|
int striptabs; /* if set, strip leading tabs */
|
|
};
|
|
|
|
static struct heredoc *heredoclist; /* list of here documents to read */
|
|
static int parsebackquote; /* nonzero if we are inside backquotes */
|
|
static int doprompt; /* if set, prompt the user */
|
|
static int needprompt; /* true if interactive and at start of line */
|
|
static int lasttoken; /* last token read */
|
|
|
|
static char *wordtext; /* text of last word returned by readtoken */
|
|
|
|
static struct nodelist *backquotelist;
|
|
static union node *redirnode;
|
|
static struct heredoc *heredoc;
|
|
static int quoteflag; /* set if (part of) last token was quoted */
|
|
static int startlinno; /* line # where last token started */
|
|
|
|
|
|
static union node *list (int);
|
|
static union node *andor (void);
|
|
static union node *pipeline (void);
|
|
static union node *command (void);
|
|
static union node *simplecmd (void);
|
|
static void parsefname (void);
|
|
static void parseheredoc (void);
|
|
static char peektoken (void);
|
|
static int readtoken (void);
|
|
static int xxreadtoken (void);
|
|
static int readtoken1 (int, int, const char *, int);
|
|
static int noexpand (char *);
|
|
static void synexpect (int) __attribute__((noreturn));
|
|
static void synerror (const char *) __attribute__((noreturn));
|
|
static void setprompt (int);
|
|
|
|
|
|
/*
|
|
* Read and parse a command. Returns NEOF on end of file. (NULL is a
|
|
* valid parse tree indicating a blank line.)
|
|
*/
|
|
|
|
static union node *
|
|
parsecmd(int interact)
|
|
{
|
|
int t;
|
|
|
|
tokpushback = 0;
|
|
doprompt = interact;
|
|
if (doprompt)
|
|
setprompt(1);
|
|
else
|
|
setprompt(0);
|
|
needprompt = 0;
|
|
t = readtoken();
|
|
if (t == TEOF)
|
|
return NEOF;
|
|
if (t == TNL)
|
|
return NULL;
|
|
tokpushback++;
|
|
return list(1);
|
|
}
|
|
|
|
|
|
static union node *
|
|
list(nlflag)
|
|
int nlflag;
|
|
{
|
|
union node *n1, *n2, *n3;
|
|
int tok;
|
|
|
|
checkkwd = 2;
|
|
if (nlflag == 0 && peektoken())
|
|
return NULL;
|
|
n1 = NULL;
|
|
for (;;) {
|
|
n2 = andor();
|
|
tok = readtoken();
|
|
if (tok == TBACKGND) {
|
|
if (n2->type == NCMD || n2->type == NPIPE) {
|
|
n2->ncmd.backgnd = 1;
|
|
} else if (n2->type == NREDIR) {
|
|
n2->type = NBACKGND;
|
|
} else {
|
|
n3 = (union node *)stalloc(sizeof (struct nredir));
|
|
n3->type = NBACKGND;
|
|
n3->nredir.n = n2;
|
|
n3->nredir.redirect = NULL;
|
|
n2 = n3;
|
|
}
|
|
}
|
|
if (n1 == NULL) {
|
|
n1 = n2;
|
|
}
|
|
else {
|
|
n3 = (union node *)stalloc(sizeof (struct nbinary));
|
|
n3->type = NSEMI;
|
|
n3->nbinary.ch1 = n1;
|
|
n3->nbinary.ch2 = n2;
|
|
n1 = n3;
|
|
}
|
|
switch (tok) {
|
|
case TBACKGND:
|
|
case TSEMI:
|
|
tok = readtoken();
|
|
/* fall through */
|
|
case TNL:
|
|
if (tok == TNL) {
|
|
parseheredoc();
|
|
if (nlflag)
|
|
return n1;
|
|
} else {
|
|
tokpushback++;
|
|
}
|
|
checkkwd = 2;
|
|
if (peektoken())
|
|
return n1;
|
|
break;
|
|
case TEOF:
|
|
if (heredoclist)
|
|
parseheredoc();
|
|
else
|
|
pungetc(); /* push back EOF on input */
|
|
return n1;
|
|
default:
|
|
if (nlflag)
|
|
synexpect(-1);
|
|
tokpushback++;
|
|
return n1;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static union node *
|
|
andor() {
|
|
union node *n1, *n2, *n3;
|
|
int t;
|
|
|
|
checkkwd = 1;
|
|
n1 = pipeline();
|
|
for (;;) {
|
|
if ((t = readtoken()) == TAND) {
|
|
t = NAND;
|
|
} else if (t == TOR) {
|
|
t = NOR;
|
|
} else {
|
|
tokpushback++;
|
|
return n1;
|
|
}
|
|
checkkwd = 2;
|
|
n2 = pipeline();
|
|
n3 = (union node *)stalloc(sizeof (struct nbinary));
|
|
n3->type = t;
|
|
n3->nbinary.ch1 = n1;
|
|
n3->nbinary.ch2 = n2;
|
|
n1 = n3;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static union node *
|
|
pipeline() {
|
|
union node *n1, *n2, *pipenode;
|
|
struct nodelist *lp, *prev;
|
|
int negate;
|
|
|
|
negate = 0;
|
|
TRACE(("pipeline: entered\n"));
|
|
if (readtoken() == TNOT) {
|
|
negate = !negate;
|
|
checkkwd = 1;
|
|
} else
|
|
tokpushback++;
|
|
n1 = command();
|
|
if (readtoken() == TPIPE) {
|
|
pipenode = (union node *)stalloc(sizeof (struct npipe));
|
|
pipenode->type = NPIPE;
|
|
pipenode->npipe.backgnd = 0;
|
|
lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
|
|
pipenode->npipe.cmdlist = lp;
|
|
lp->n = n1;
|
|
do {
|
|
prev = lp;
|
|
lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
|
|
checkkwd = 2;
|
|
lp->n = command();
|
|
prev->next = lp;
|
|
} while (readtoken() == TPIPE);
|
|
lp->next = NULL;
|
|
n1 = pipenode;
|
|
}
|
|
tokpushback++;
|
|
if (negate) {
|
|
n2 = (union node *)stalloc(sizeof (struct nnot));
|
|
n2->type = NNOT;
|
|
n2->nnot.com = n1;
|
|
return n2;
|
|
} else
|
|
return n1;
|
|
}
|
|
|
|
|
|
|
|
static union node *
|
|
command() {
|
|
union node *n1, *n2;
|
|
union node *ap, **app;
|
|
union node *cp, **cpp;
|
|
union node *redir, **rpp;
|
|
int t;
|
|
|
|
redir = NULL;
|
|
n1 = NULL;
|
|
rpp = &redir;
|
|
|
|
/* Check for redirection which may precede command */
|
|
while (readtoken() == TREDIR) {
|
|
*rpp = n2 = redirnode;
|
|
rpp = &n2->nfile.next;
|
|
parsefname();
|
|
}
|
|
tokpushback++;
|
|
|
|
switch (readtoken()) {
|
|
case TIF:
|
|
n1 = (union node *)stalloc(sizeof (struct nif));
|
|
n1->type = NIF;
|
|
n1->nif.test = list(0);
|
|
if (readtoken() != TTHEN)
|
|
synexpect(TTHEN);
|
|
n1->nif.ifpart = list(0);
|
|
n2 = n1;
|
|
while (readtoken() == TELIF) {
|
|
n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
|
|
n2 = n2->nif.elsepart;
|
|
n2->type = NIF;
|
|
n2->nif.test = list(0);
|
|
if (readtoken() != TTHEN)
|
|
synexpect(TTHEN);
|
|
n2->nif.ifpart = list(0);
|
|
}
|
|
if (lasttoken == TELSE)
|
|
n2->nif.elsepart = list(0);
|
|
else {
|
|
n2->nif.elsepart = NULL;
|
|
tokpushback++;
|
|
}
|
|
if (readtoken() != TFI)
|
|
synexpect(TFI);
|
|
checkkwd = 1;
|
|
break;
|
|
case TWHILE:
|
|
case TUNTIL: {
|
|
int got;
|
|
n1 = (union node *)stalloc(sizeof (struct nbinary));
|
|
n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
|
|
n1->nbinary.ch1 = list(0);
|
|
if ((got=readtoken()) != TDO) {
|
|
TRACE(("expecting DO got %s %s\n", tokname(got), got == TWORD ? wordtext : ""));
|
|
synexpect(TDO);
|
|
}
|
|
n1->nbinary.ch2 = list(0);
|
|
if (readtoken() != TDONE)
|
|
synexpect(TDONE);
|
|
checkkwd = 1;
|
|
break;
|
|
}
|
|
case TFOR:
|
|
if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
|
|
synerror("Bad for loop variable");
|
|
n1 = (union node *)stalloc(sizeof (struct nfor));
|
|
n1->type = NFOR;
|
|
n1->nfor.var = wordtext;
|
|
checkkwd = 1;
|
|
if (readtoken() == TIN) {
|
|
app = ≈
|
|
while (readtoken() == TWORD) {
|
|
n2 = (union node *)stalloc(sizeof (struct narg));
|
|
n2->type = NARG;
|
|
n2->narg.text = wordtext;
|
|
n2->narg.backquote = backquotelist;
|
|
*app = n2;
|
|
app = &n2->narg.next;
|
|
}
|
|
*app = NULL;
|
|
n1->nfor.args = ap;
|
|
if (lasttoken != TNL && lasttoken != TSEMI)
|
|
synexpect(-1);
|
|
} else {
|
|
static char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE,
|
|
'@', '=', '\0'};
|
|
n2 = (union node *)stalloc(sizeof (struct narg));
|
|
n2->type = NARG;
|
|
n2->narg.text = argvars;
|
|
n2->narg.backquote = NULL;
|
|
n2->narg.next = NULL;
|
|
n1->nfor.args = n2;
|
|
/*
|
|
* Newline or semicolon here is optional (but note
|
|
* that the original Bourne shell only allowed NL).
|
|
*/
|
|
if (lasttoken != TNL && lasttoken != TSEMI)
|
|
tokpushback++;
|
|
}
|
|
checkkwd = 2;
|
|
if (readtoken() != TDO)
|
|
synexpect(TDO);
|
|
n1->nfor.body = list(0);
|
|
if (readtoken() != TDONE)
|
|
synexpect(TDONE);
|
|
checkkwd = 1;
|
|
break;
|
|
case TCASE:
|
|
n1 = (union node *)stalloc(sizeof (struct ncase));
|
|
n1->type = NCASE;
|
|
if (readtoken() != TWORD)
|
|
synexpect(TWORD);
|
|
n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
|
|
n2->type = NARG;
|
|
n2->narg.text = wordtext;
|
|
n2->narg.backquote = backquotelist;
|
|
n2->narg.next = NULL;
|
|
do {
|
|
checkkwd = 1;
|
|
} while (readtoken() == TNL);
|
|
if (lasttoken != TIN)
|
|
synerror("expecting \"in\"");
|
|
cpp = &n1->ncase.cases;
|
|
checkkwd = 2, readtoken();
|
|
do {
|
|
if (lasttoken == TLP)
|
|
readtoken();
|
|
*cpp = cp = (union node *)stalloc(sizeof (struct nclist));
|
|
cp->type = NCLIST;
|
|
app = &cp->nclist.pattern;
|
|
for (;;) {
|
|
*app = ap = (union node *)stalloc(sizeof (struct narg));
|
|
ap->type = NARG;
|
|
ap->narg.text = wordtext;
|
|
ap->narg.backquote = backquotelist;
|
|
if (checkkwd = 2, readtoken() != TPIPE)
|
|
break;
|
|
app = &ap->narg.next;
|
|
readtoken();
|
|
}
|
|
ap->narg.next = NULL;
|
|
if (lasttoken != TRP)
|
|
synexpect(TRP);
|
|
cp->nclist.body = list(0);
|
|
|
|
checkkwd = 2;
|
|
if ((t = readtoken()) != TESAC) {
|
|
if (t != TENDCASE)
|
|
synexpect(TENDCASE);
|
|
else
|
|
checkkwd = 2, readtoken();
|
|
}
|
|
cpp = &cp->nclist.next;
|
|
} while(lasttoken != TESAC);
|
|
*cpp = NULL;
|
|
checkkwd = 1;
|
|
break;
|
|
case TLP:
|
|
n1 = (union node *)stalloc(sizeof (struct nredir));
|
|
n1->type = NSUBSHELL;
|
|
n1->nredir.n = list(0);
|
|
n1->nredir.redirect = NULL;
|
|
if (readtoken() != TRP)
|
|
synexpect(TRP);
|
|
checkkwd = 1;
|
|
break;
|
|
case TBEGIN:
|
|
n1 = list(0);
|
|
if (readtoken() != TEND)
|
|
synexpect(TEND);
|
|
checkkwd = 1;
|
|
break;
|
|
/* Handle an empty command like other simple commands. */
|
|
case TSEMI:
|
|
case TAND:
|
|
case TOR:
|
|
case TNL:
|
|
case TEOF:
|
|
case TRP:
|
|
case TBACKGND:
|
|
/*
|
|
* An empty command before a ; doesn't make much sense, and
|
|
* should certainly be disallowed in the case of `if ;'.
|
|
*/
|
|
if (!redir)
|
|
synexpect(-1);
|
|
case TWORD:
|
|
tokpushback++;
|
|
n1 = simplecmd();
|
|
return n1;
|
|
default:
|
|
synexpect(-1);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/* Now check for redirection which may follow command */
|
|
while (readtoken() == TREDIR) {
|
|
*rpp = n2 = redirnode;
|
|
rpp = &n2->nfile.next;
|
|
parsefname();
|
|
}
|
|
tokpushback++;
|
|
*rpp = NULL;
|
|
if (redir) {
|
|
if (n1->type != NSUBSHELL) {
|
|
n2 = (union node *)stalloc(sizeof (struct nredir));
|
|
n2->type = NREDIR;
|
|
n2->nredir.n = n1;
|
|
n1 = n2;
|
|
}
|
|
n1->nredir.redirect = redir;
|
|
}
|
|
|
|
return n1;
|
|
}
|
|
|
|
|
|
static union node *
|
|
simplecmd() {
|
|
union node *args, **app;
|
|
union node *n = NULL;
|
|
union node *vars, **vpp;
|
|
union node **rpp, *redir;
|
|
|
|
args = NULL;
|
|
app = &args;
|
|
vars = NULL;
|
|
vpp = &vars;
|
|
redir = NULL;
|
|
rpp = &redir;
|
|
|
|
checkalias = 2;
|
|
for (;;) {
|
|
switch (readtoken()) {
|
|
case TWORD:
|
|
case TASSIGN:
|
|
n = (union node *)stalloc(sizeof (struct narg));
|
|
n->type = NARG;
|
|
n->narg.text = wordtext;
|
|
n->narg.backquote = backquotelist;
|
|
if (lasttoken == TWORD) {
|
|
*app = n;
|
|
app = &n->narg.next;
|
|
} else {
|
|
*vpp = n;
|
|
vpp = &n->narg.next;
|
|
}
|
|
break;
|
|
case TREDIR:
|
|
*rpp = n = redirnode;
|
|
rpp = &n->nfile.next;
|
|
parsefname(); /* read name of redirection file */
|
|
break;
|
|
case TLP:
|
|
if (
|
|
args && app == &args->narg.next &&
|
|
!vars && !redir
|
|
) {
|
|
/* We have a function */
|
|
if (readtoken() != TRP)
|
|
synexpect(TRP);
|
|
n->type = NDEFUN;
|
|
checkkwd = 2;
|
|
n->narg.next = command();
|
|
return n;
|
|
}
|
|
/* fall through */
|
|
default:
|
|
tokpushback++;
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
*app = NULL;
|
|
*vpp = NULL;
|
|
*rpp = NULL;
|
|
n = (union node *)stalloc(sizeof (struct ncmd));
|
|
n->type = NCMD;
|
|
n->ncmd.backgnd = 0;
|
|
n->ncmd.args = args;
|
|
n->ncmd.assign = vars;
|
|
n->ncmd.redirect = redir;
|
|
return n;
|
|
}
|
|
|
|
static union node *
|
|
makename(void) {
|
|
union node *n;
|
|
|
|
n = (union node *)stalloc(sizeof (struct narg));
|
|
n->type = NARG;
|
|
n->narg.next = NULL;
|
|
n->narg.text = wordtext;
|
|
n->narg.backquote = backquotelist;
|
|
return n;
|
|
}
|
|
|
|
static void fixredir(union node *n, const char *text, int err)
|
|
{
|
|
TRACE(("Fix redir %s %d\n", text, err));
|
|
if (!err)
|
|
n->ndup.vname = NULL;
|
|
|
|
if (is_digit(text[0]) && text[1] == '\0')
|
|
n->ndup.dupfd = digit_val(text[0]);
|
|
else if (text[0] == '-' && text[1] == '\0')
|
|
n->ndup.dupfd = -1;
|
|
else {
|
|
|
|
if (err)
|
|
synerror("Bad fd number");
|
|
else
|
|
n->ndup.vname = makename();
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
parsefname(void) {
|
|
union node *n = redirnode;
|
|
|
|
if (readtoken() != TWORD)
|
|
synexpect(-1);
|
|
if (n->type == NHERE) {
|
|
struct heredoc *here = heredoc;
|
|
struct heredoc *p;
|
|
int i;
|
|
|
|
if (quoteflag == 0)
|
|
n->type = NXHERE;
|
|
TRACE(("Here document %d\n", n->type));
|
|
if (here->striptabs) {
|
|
while (*wordtext == '\t')
|
|
wordtext++;
|
|
}
|
|
if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
|
|
synerror("Illegal eof marker for << redirection");
|
|
rmescapes(wordtext);
|
|
here->eofmark = wordtext;
|
|
here->next = NULL;
|
|
if (heredoclist == NULL)
|
|
heredoclist = here;
|
|
else {
|
|
for (p = heredoclist ; p->next ; p = p->next);
|
|
p->next = here;
|
|
}
|
|
} else if (n->type == NTOFD || n->type == NFROMFD) {
|
|
fixredir(n, wordtext, 0);
|
|
} else {
|
|
n->nfile.fname = makename();
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Input any here documents.
|
|
*/
|
|
|
|
static void
|
|
parseheredoc() {
|
|
struct heredoc *here;
|
|
union node *n;
|
|
|
|
while (heredoclist) {
|
|
here = heredoclist;
|
|
heredoclist = here->next;
|
|
if (needprompt) {
|
|
setprompt(2);
|
|
needprompt = 0;
|
|
}
|
|
readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
|
|
here->eofmark, here->striptabs);
|
|
n = (union node *)stalloc(sizeof (struct narg));
|
|
n->narg.type = NARG;
|
|
n->narg.next = NULL;
|
|
n->narg.text = wordtext;
|
|
n->narg.backquote = backquotelist;
|
|
here->here->nhere.doc = n;
|
|
}
|
|
}
|
|
|
|
static char
|
|
peektoken() {
|
|
int t;
|
|
|
|
t = readtoken();
|
|
tokpushback++;
|
|
return tokname_array[t][0];
|
|
}
|
|
|
|
static int
|
|
readtoken() {
|
|
int t;
|
|
|
|
#ifdef ASH_ALIAS
|
|
int savecheckalias = checkalias;
|
|
int savecheckkwd = checkkwd;
|
|
struct alias *ap;
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
int alreadyseen = tokpushback;
|
|
#endif
|
|
|
|
#ifdef ASH_ALIAS
|
|
top:
|
|
#endif
|
|
|
|
t = xxreadtoken();
|
|
|
|
#ifdef ASH_ALIAS
|
|
checkalias = savecheckalias;
|
|
#endif
|
|
|
|
if (checkkwd) {
|
|
/*
|
|
* eat newlines
|
|
*/
|
|
if (checkkwd == 2) {
|
|
checkkwd = 0;
|
|
while (t == TNL) {
|
|
parseheredoc();
|
|
t = xxreadtoken();
|
|
}
|
|
}
|
|
checkkwd = 0;
|
|
/*
|
|
* check for keywords
|
|
*/
|
|
if (t == TWORD && !quoteflag)
|
|
{
|
|
const char *const *pp;
|
|
|
|
if ((pp = findkwd(wordtext))) {
|
|
lasttoken = t = pp - tokname_array;
|
|
TRACE(("keyword %s recognized\n", tokname(t)));
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
if (t != TWORD) {
|
|
if (t != TREDIR) {
|
|
checkalias = 0;
|
|
}
|
|
} else if (checkalias == 2 && isassignment(wordtext)) {
|
|
lasttoken = t = TASSIGN;
|
|
#ifdef ASH_ALIAS
|
|
} else if (checkalias) {
|
|
if (!quoteflag && (ap = lookupalias(wordtext, 1)) != NULL) {
|
|
if (*ap->val) {
|
|
pushstring(ap->val, strlen(ap->val), ap);
|
|
}
|
|
checkkwd = savecheckkwd;
|
|
goto top;
|
|
}
|
|
checkalias = 0;
|
|
#endif
|
|
}
|
|
out:
|
|
#ifdef DEBUG
|
|
if (!alreadyseen)
|
|
TRACE(("token %s %s\n", tokname(t), t == TWORD || t == TASSIGN ? wordtext : ""));
|
|
else
|
|
TRACE(("reread token %s %s\n", tokname(t), t == TWORD || t == TASSIGN ? wordtext : ""));
|
|
#endif
|
|
return (t);
|
|
}
|
|
|
|
|
|
/*
|
|
* Read the next input token.
|
|
* If the token is a word, we set backquotelist to the list of cmds in
|
|
* backquotes. We set quoteflag to true if any part of the word was
|
|
* quoted.
|
|
* If the token is TREDIR, then we set redirnode to a structure containing
|
|
* the redirection.
|
|
* In all cases, the variable startlinno is set to the number of the line
|
|
* on which the token starts.
|
|
*
|
|
* [Change comment: here documents and internal procedures]
|
|
* [Readtoken shouldn't have any arguments. Perhaps we should make the
|
|
* word parsing code into a separate routine. In this case, readtoken
|
|
* doesn't need to have any internal procedures, but parseword does.
|
|
* We could also make parseoperator in essence the main routine, and
|
|
* have parseword (readtoken1?) handle both words and redirection.]
|
|
*/
|
|
|
|
#define NEW_xxreadtoken
|
|
#ifdef NEW_xxreadtoken
|
|
|
|
static const char xxreadtoken_chars[] = "\n()&|;"; /* singles must be first! */
|
|
static const char xxreadtoken_tokens[] = {
|
|
TNL, TLP, TRP, /* only single occurrence allowed */
|
|
TBACKGND, TPIPE, TSEMI, /* if single occurrence */
|
|
TEOF, /* corresponds to trailing nul */
|
|
TAND, TOR, TENDCASE, /* if double occurrence */
|
|
};
|
|
|
|
#define xxreadtoken_doubles \
|
|
(sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
|
|
#define xxreadtoken_singles \
|
|
(sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
|
|
|
|
static int
|
|
xxreadtoken() {
|
|
int c;
|
|
|
|
if (tokpushback) {
|
|
tokpushback = 0;
|
|
return lasttoken;
|
|
}
|
|
if (needprompt) {
|
|
setprompt(2);
|
|
needprompt = 0;
|
|
}
|
|
startlinno = plinno;
|
|
for (;;) { /* until token or start of word found */
|
|
c = pgetc_macro();
|
|
|
|
if ((c!=' ') && (c!='\t')
|
|
#ifdef ASH_ALIAS
|
|
&& (c!=PEOA)
|
|
#endif
|
|
) {
|
|
if (c=='#') {
|
|
while ((c = pgetc()) != '\n' && c != PEOF);
|
|
pungetc();
|
|
} else if (c=='\\') {
|
|
if (pgetc() != '\n') {
|
|
pungetc();
|
|
goto READTOKEN1;
|
|
}
|
|
startlinno = ++plinno;
|
|
setprompt(doprompt ? 2 : 0);
|
|
} else {
|
|
const char *p
|
|
= xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
|
|
|
|
if (c!=PEOF) {
|
|
if (c=='\n') {
|
|
plinno++;
|
|
needprompt = doprompt;
|
|
}
|
|
|
|
p = strchr(xxreadtoken_chars, c);
|
|
if (p == NULL) {
|
|
READTOKEN1:
|
|
return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
|
|
}
|
|
|
|
if (p-xxreadtoken_chars >= xxreadtoken_singles) {
|
|
if (pgetc() == *p) { /* double occurrence? */
|
|
p += xxreadtoken_doubles + 1;
|
|
} else {
|
|
pungetc();
|
|
}
|
|
}
|
|
}
|
|
|
|
return lasttoken = xxreadtoken_tokens[p-xxreadtoken_chars];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#else
|
|
#define RETURN(token) return lasttoken = token
|
|
|
|
static int
|
|
xxreadtoken() {
|
|
int c;
|
|
|
|
if (tokpushback) {
|
|
tokpushback = 0;
|
|
return lasttoken;
|
|
}
|
|
if (needprompt) {
|
|
setprompt(2);
|
|
needprompt = 0;
|
|
}
|
|
startlinno = plinno;
|
|
for (;;) { /* until token or start of word found */
|
|
c = pgetc_macro();
|
|
switch (c) {
|
|
case ' ': case '\t':
|
|
#ifdef ASH_ALIAS
|
|
case PEOA:
|
|
#endif
|
|
continue;
|
|
case '#':
|
|
while ((c = pgetc()) != '\n' && c != PEOF);
|
|
pungetc();
|
|
continue;
|
|
case '\\':
|
|
if (pgetc() == '\n') {
|
|
startlinno = ++plinno;
|
|
if (doprompt)
|
|
setprompt(2);
|
|
else
|
|
setprompt(0);
|
|
continue;
|
|
}
|
|
pungetc();
|
|
goto breakloop;
|
|
case '\n':
|
|
plinno++;
|
|
needprompt = doprompt;
|
|
RETURN(TNL);
|
|
case PEOF:
|
|
RETURN(TEOF);
|
|
case '&':
|
|
if (pgetc() == '&')
|
|
RETURN(TAND);
|
|
pungetc();
|
|
RETURN(TBACKGND);
|
|
case '|':
|
|
if (pgetc() == '|')
|
|
RETURN(TOR);
|
|
pungetc();
|
|
RETURN(TPIPE);
|
|
case ';':
|
|
if (pgetc() == ';')
|
|
RETURN(TENDCASE);
|
|
pungetc();
|
|
RETURN(TSEMI);
|
|
case '(':
|
|
RETURN(TLP);
|
|
case ')':
|
|
RETURN(TRP);
|
|
default:
|
|
goto breakloop;
|
|
}
|
|
}
|
|
breakloop:
|
|
return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
|
|
#undef RETURN
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* If eofmark is NULL, read a word or a redirection symbol. If eofmark
|
|
* is not NULL, read a here document. In the latter case, eofmark is the
|
|
* word which marks the end of the document and striptabs is true if
|
|
* leading tabs should be stripped from the document. The argument firstc
|
|
* is the first character of the input token or document.
|
|
*
|
|
* Because C does not have internal subroutines, I have simulated them
|
|
* using goto's to implement the subroutine linkage. The following macros
|
|
* will run code that appears at the end of readtoken1.
|
|
*/
|
|
|
|
#define CHECKEND() {goto checkend; checkend_return:;}
|
|
#define PARSEREDIR() {goto parseredir; parseredir_return:;}
|
|
#define PARSESUB() {goto parsesub; parsesub_return:;}
|
|
#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
|
|
#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
|
|
#define PARSEARITH() {goto parsearith; parsearith_return:;}
|
|
|
|
static int
|
|
readtoken1(int firstc, int syntax, const char *eofmark, int striptabs)
|
|
{
|
|
int c = firstc;
|
|
char *out;
|
|
int len;
|
|
char line[EOFMARKLEN + 1];
|
|
struct nodelist *bqlist;
|
|
int quotef;
|
|
int dblquote;
|
|
int varnest; /* levels of variables expansion */
|
|
int arinest; /* levels of arithmetic expansion */
|
|
int parenlevel; /* levels of parens in arithmetic */
|
|
int dqvarnest; /* levels of variables expansion within double quotes */
|
|
int oldstyle;
|
|
int prevsyntax; /* syntax before arithmetic */
|
|
#if __GNUC__
|
|
/* Avoid longjmp clobbering */
|
|
(void) &out;
|
|
(void) "ef;
|
|
(void) &dblquote;
|
|
(void) &varnest;
|
|
(void) &arinest;
|
|
(void) &parenlevel;
|
|
(void) &dqvarnest;
|
|
(void) &oldstyle;
|
|
(void) &prevsyntax;
|
|
(void) &syntax;
|
|
#endif
|
|
|
|
startlinno = plinno;
|
|
dblquote = 0;
|
|
if (syntax == DQSYNTAX)
|
|
dblquote = 1;
|
|
quotef = 0;
|
|
bqlist = NULL;
|
|
varnest = 0;
|
|
arinest = 0;
|
|
parenlevel = 0;
|
|
dqvarnest = 0;
|
|
|
|
STARTSTACKSTR(out);
|
|
loop: { /* for each line, until end of word */
|
|
CHECKEND(); /* set c to PEOF if at end of here document */
|
|
for (;;) { /* until end of line or end of word */
|
|
CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */
|
|
switch(SIT(c,syntax)) {
|
|
case CNL: /* '\n' */
|
|
if (syntax == BASESYNTAX)
|
|
goto endword; /* exit outer loop */
|
|
USTPUTC(c, out);
|
|
plinno++;
|
|
if (doprompt)
|
|
setprompt(2);
|
|
else
|
|
setprompt(0);
|
|
c = pgetc();
|
|
goto loop; /* continue outer loop */
|
|
case CWORD:
|
|
USTPUTC(c, out);
|
|
break;
|
|
case CCTL:
|
|
if ((eofmark == NULL || dblquote) &&
|
|
dqvarnest == 0)
|
|
USTPUTC(CTLESC, out);
|
|
USTPUTC(c, out);
|
|
break;
|
|
case CBACK: /* backslash */
|
|
c = pgetc2();
|
|
if (c == PEOF) {
|
|
USTPUTC('\\', out);
|
|
pungetc();
|
|
} else if (c == '\n') {
|
|
if (doprompt)
|
|
setprompt(2);
|
|
else
|
|
setprompt(0);
|
|
} else {
|
|
if (dblquote && c != '\\' && c != '`' && c != '$'
|
|
&& (c != '"' || eofmark != NULL))
|
|
USTPUTC('\\', out);
|
|
if (SIT(c,SQSYNTAX) == CCTL)
|
|
USTPUTC(CTLESC, out);
|
|
else if (eofmark == NULL)
|
|
USTPUTC(CTLQUOTEMARK, out);
|
|
USTPUTC(c, out);
|
|
quotef++;
|
|
}
|
|
break;
|
|
case CSQUOTE:
|
|
if (eofmark == NULL)
|
|
USTPUTC(CTLQUOTEMARK, out);
|
|
syntax = SQSYNTAX;
|
|
break;
|
|
case CDQUOTE:
|
|
if (eofmark == NULL)
|
|
USTPUTC(CTLQUOTEMARK, out);
|
|
syntax = DQSYNTAX;
|
|
dblquote = 1;
|
|
break;
|
|
case CENDQUOTE:
|
|
if (eofmark != NULL && arinest == 0 &&
|
|
varnest == 0) {
|
|
USTPUTC(c, out);
|
|
} else {
|
|
if (arinest) {
|
|
syntax = ARISYNTAX;
|
|
dblquote = 0;
|
|
} else if (eofmark == NULL &&
|
|
dqvarnest == 0) {
|
|
syntax = BASESYNTAX;
|
|
dblquote = 0;
|
|
}
|
|
quotef++;
|
|
}
|
|
break;
|
|
case CVAR: /* '$' */
|
|
PARSESUB(); /* parse substitution */
|
|
break;
|
|
case CENDVAR: /* '}' */
|
|
if (varnest > 0) {
|
|
varnest--;
|
|
if (dqvarnest > 0) {
|
|
dqvarnest--;
|
|
}
|
|
USTPUTC(CTLENDVAR, out);
|
|
} else {
|
|
USTPUTC(c, out);
|
|
}
|
|
break;
|
|
#ifdef ASH_MATH_SUPPORT
|
|
case CLP: /* '(' in arithmetic */
|
|
parenlevel++;
|
|
USTPUTC(c, out);
|
|
break;
|
|
case CRP: /* ')' in arithmetic */
|
|
if (parenlevel > 0) {
|
|
USTPUTC(c, out);
|
|
--parenlevel;
|
|
} else {
|
|
if (pgetc() == ')') {
|
|
if (--arinest == 0) {
|
|
USTPUTC(CTLENDARI, out);
|
|
syntax = prevsyntax;
|
|
if (syntax == DQSYNTAX)
|
|
dblquote = 1;
|
|
else
|
|
dblquote = 0;
|
|
} else
|
|
USTPUTC(')', out);
|
|
} else {
|
|
/*
|
|
* unbalanced parens
|
|
* (don't 2nd guess - no error)
|
|
*/
|
|
pungetc();
|
|
USTPUTC(')', out);
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
case CBQUOTE: /* '`' */
|
|
PARSEBACKQOLD();
|
|
break;
|
|
case CENDFILE:
|
|
goto endword; /* exit outer loop */
|
|
case CIGN:
|
|
break;
|
|
default:
|
|
if (varnest == 0)
|
|
goto endword; /* exit outer loop */
|
|
#ifdef ASH_ALIAS
|
|
if (c != PEOA)
|
|
#endif
|
|
USTPUTC(c, out);
|
|
|
|
}
|
|
c = pgetc_macro();
|
|
}
|
|
}
|
|
endword:
|
|
if (syntax == ARISYNTAX)
|
|
synerror("Missing '))'");
|
|
if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
|
|
synerror("Unterminated quoted string");
|
|
if (varnest != 0) {
|
|
startlinno = plinno;
|
|
synerror("Missing '}'");
|
|
}
|
|
USTPUTC('\0', out);
|
|
len = out - stackblock();
|
|
out = stackblock();
|
|
if (eofmark == NULL) {
|
|
if ((c == '>' || c == '<')
|
|
&& quotef == 0
|
|
&& len <= 2
|
|
&& (*out == '\0' || is_digit(*out))) {
|
|
PARSEREDIR();
|
|
return lasttoken = TREDIR;
|
|
} else {
|
|
pungetc();
|
|
}
|
|
}
|
|
quoteflag = quotef;
|
|
backquotelist = bqlist;
|
|
grabstackblock(len);
|
|
wordtext = out;
|
|
return lasttoken = TWORD;
|
|
/* end of readtoken routine */
|
|
|
|
|
|
|
|
/*
|
|
* Check to see whether we are at the end of the here document. When this
|
|
* is called, c is set to the first character of the next input line. If
|
|
* we are at the end of the here document, this routine sets the c to PEOF.
|
|
*/
|
|
|
|
checkend: {
|
|
if (eofmark) {
|
|
#ifdef ASH_ALIAS
|
|
if (c == PEOA) {
|
|
c = pgetc2();
|
|
}
|
|
#endif
|
|
if (striptabs) {
|
|
while (c == '\t') {
|
|
c = pgetc2();
|
|
}
|
|
}
|
|
if (c == *eofmark) {
|
|
if (pfgets(line, sizeof line) != NULL) {
|
|
const char *p, *q;
|
|
|
|
p = line;
|
|
for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
|
|
if (*p == '\n' && *q == '\0') {
|
|
c = PEOF;
|
|
plinno++;
|
|
needprompt = doprompt;
|
|
} else {
|
|
pushstring(line, strlen(line), NULL);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
goto checkend_return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Parse a redirection operator. The variable "out" points to a string
|
|
* specifying the fd to be redirected. The variable "c" contains the
|
|
* first character of the redirection operator.
|
|
*/
|
|
|
|
parseredir: {
|
|
char fd = *out;
|
|
union node *np;
|
|
|
|
np = (union node *)stalloc(sizeof (struct nfile));
|
|
if (c == '>') {
|
|
np->nfile.fd = 1;
|
|
c = pgetc();
|
|
if (c == '>')
|
|
np->type = NAPPEND;
|
|
else if (c == '&')
|
|
np->type = NTOFD;
|
|
else if (c == '|')
|
|
np->type = NTOOV;
|
|
else {
|
|
np->type = NTO;
|
|
pungetc();
|
|
}
|
|
} else { /* c == '<' */
|
|
np->nfile.fd = 0;
|
|
switch (c = pgetc()) {
|
|
case '<':
|
|
if (sizeof (struct nfile) != sizeof (struct nhere)) {
|
|
np = (union node *)stalloc(sizeof (struct nhere));
|
|
np->nfile.fd = 0;
|
|
}
|
|
np->type = NHERE;
|
|
heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
|
|
heredoc->here = np;
|
|
if ((c = pgetc()) == '-') {
|
|
heredoc->striptabs = 1;
|
|
} else {
|
|
heredoc->striptabs = 0;
|
|
pungetc();
|
|
}
|
|
break;
|
|
|
|
case '&':
|
|
np->type = NFROMFD;
|
|
break;
|
|
|
|
case '>':
|
|
np->type = NFROMTO;
|
|
break;
|
|
|
|
default:
|
|
np->type = NFROM;
|
|
pungetc();
|
|
break;
|
|
}
|
|
}
|
|
if (fd != '\0')
|
|
np->nfile.fd = digit_val(fd);
|
|
redirnode = np;
|
|
goto parseredir_return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Parse a substitution. At this point, we have read the dollar sign
|
|
* and nothing else.
|
|
*/
|
|
|
|
parsesub: {
|
|
int subtype;
|
|
int typeloc;
|
|
int flags;
|
|
char *p;
|
|
static const char types[] = "}-+?=";
|
|
|
|
c = pgetc();
|
|
if (
|
|
c <= PEOA ||
|
|
(c != '(' && c != '{' && !is_name(c) && !is_special(c))
|
|
) {
|
|
USTPUTC('$', out);
|
|
pungetc();
|
|
} else if (c == '(') { /* $(command) or $((arith)) */
|
|
if (pgetc() == '(') {
|
|
PARSEARITH();
|
|
} else {
|
|
pungetc();
|
|
PARSEBACKQNEW();
|
|
}
|
|
} else {
|
|
USTPUTC(CTLVAR, out);
|
|
typeloc = out - stackblock();
|
|
USTPUTC(VSNORMAL, out);
|
|
subtype = VSNORMAL;
|
|
if (c == '{') {
|
|
c = pgetc();
|
|
if (c == '#') {
|
|
if ((c = pgetc()) == '}')
|
|
c = '#';
|
|
else
|
|
subtype = VSLENGTH;
|
|
}
|
|
else
|
|
subtype = 0;
|
|
}
|
|
if (c > PEOA && is_name(c)) {
|
|
do {
|
|
STPUTC(c, out);
|
|
c = pgetc();
|
|
} while (c > PEOA && is_in_name(c));
|
|
} else if (is_digit(c)) {
|
|
do {
|
|
USTPUTC(c, out);
|
|
c = pgetc();
|
|
} while (is_digit(c));
|
|
}
|
|
else if (is_special(c)) {
|
|
USTPUTC(c, out);
|
|
c = pgetc();
|
|
}
|
|
else
|
|
badsub: synerror("Bad substitution");
|
|
|
|
STPUTC('=', out);
|
|
flags = 0;
|
|
if (subtype == 0) {
|
|
switch (c) {
|
|
case ':':
|
|
flags = VSNUL;
|
|
c = pgetc();
|
|
/*FALLTHROUGH*/
|
|
default:
|
|
p = strchr(types, c);
|
|
if (p == NULL)
|
|
goto badsub;
|
|
subtype = p - types + VSNORMAL;
|
|
break;
|
|
case '%':
|
|
case '#':
|
|
{
|
|
int cc = c;
|
|
subtype = c == '#' ? VSTRIMLEFT :
|
|
VSTRIMRIGHT;
|
|
c = pgetc();
|
|
if (c == cc)
|
|
subtype++;
|
|
else
|
|
pungetc();
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
pungetc();
|
|
}
|
|
if (dblquote || arinest)
|
|
flags |= VSQUOTE;
|
|
*(stackblock() + typeloc) = subtype | flags;
|
|
if (subtype != VSNORMAL) {
|
|
varnest++;
|
|
if (dblquote) {
|
|
dqvarnest++;
|
|
}
|
|
}
|
|
}
|
|
goto parsesub_return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Called to parse command substitutions. Newstyle is set if the command
|
|
* is enclosed inside $(...); nlpp is a pointer to the head of the linked
|
|
* list of commands (passed by reference), and savelen is the number of
|
|
* characters on the top of the stack which must be preserved.
|
|
*/
|
|
|
|
parsebackq: {
|
|
struct nodelist **nlpp;
|
|
int savepbq;
|
|
union node *n;
|
|
char *volatile str;
|
|
struct jmploc jmploc;
|
|
struct jmploc *volatile savehandler;
|
|
int savelen;
|
|
int saveprompt;
|
|
#ifdef __GNUC__
|
|
(void) &saveprompt;
|
|
#endif
|
|
|
|
savepbq = parsebackquote;
|
|
if (setjmp(jmploc.loc)) {
|
|
if (str)
|
|
ckfree(str);
|
|
parsebackquote = 0;
|
|
handler = savehandler;
|
|
longjmp(handler->loc, 1);
|
|
}
|
|
INTOFF;
|
|
str = NULL;
|
|
savelen = out - stackblock();
|
|
if (savelen > 0) {
|
|
str = ckmalloc(savelen);
|
|
memcpy(str, stackblock(), savelen);
|
|
}
|
|
savehandler = handler;
|
|
handler = &jmploc;
|
|
INTON;
|
|
if (oldstyle) {
|
|
/* We must read until the closing backquote, giving special
|
|
treatment to some slashes, and then push the string and
|
|
reread it as input, interpreting it normally. */
|
|
char *pout;
|
|
int pc;
|
|
int psavelen;
|
|
char *pstr;
|
|
|
|
|
|
STARTSTACKSTR(pout);
|
|
for (;;) {
|
|
if (needprompt) {
|
|
setprompt(2);
|
|
needprompt = 0;
|
|
}
|
|
switch (pc = pgetc()) {
|
|
case '`':
|
|
goto done;
|
|
|
|
case '\\':
|
|
if ((pc = pgetc()) == '\n') {
|
|
plinno++;
|
|
if (doprompt)
|
|
setprompt(2);
|
|
else
|
|
setprompt(0);
|
|
/*
|
|
* If eating a newline, avoid putting
|
|
* the newline into the new character
|
|
* stream (via the STPUTC after the
|
|
* switch).
|
|
*/
|
|
continue;
|
|
}
|
|
if (pc != '\\' && pc != '`' && pc != '$'
|
|
&& (!dblquote || pc != '"'))
|
|
STPUTC('\\', pout);
|
|
if (pc > PEOA) {
|
|
break;
|
|
}
|
|
/* fall through */
|
|
|
|
case PEOF:
|
|
#ifdef ASH_ALIAS
|
|
case PEOA:
|
|
#endif
|
|
startlinno = plinno;
|
|
synerror("EOF in backquote substitution");
|
|
|
|
case '\n':
|
|
plinno++;
|
|
needprompt = doprompt;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
STPUTC(pc, pout);
|
|
}
|
|
done:
|
|
STPUTC('\0', pout);
|
|
psavelen = pout - stackblock();
|
|
if (psavelen > 0) {
|
|
pstr = grabstackstr(pout);
|
|
setinputstring(pstr);
|
|
}
|
|
}
|
|
nlpp = &bqlist;
|
|
while (*nlpp)
|
|
nlpp = &(*nlpp)->next;
|
|
*nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
|
|
(*nlpp)->next = NULL;
|
|
parsebackquote = oldstyle;
|
|
|
|
if (oldstyle) {
|
|
saveprompt = doprompt;
|
|
doprompt = 0;
|
|
}
|
|
|
|
n = list(0);
|
|
|
|
if (oldstyle)
|
|
doprompt = saveprompt;
|
|
else {
|
|
if (readtoken() != TRP)
|
|
synexpect(TRP);
|
|
}
|
|
|
|
(*nlpp)->n = n;
|
|
if (oldstyle) {
|
|
/*
|
|
* Start reading from old file again, ignoring any pushed back
|
|
* tokens left from the backquote parsing
|
|
*/
|
|
popfile();
|
|
tokpushback = 0;
|
|
}
|
|
while (stackblocksize() <= savelen)
|
|
growstackblock();
|
|
STARTSTACKSTR(out);
|
|
if (str) {
|
|
memcpy(out, str, savelen);
|
|
STADJUST(savelen, out);
|
|
INTOFF;
|
|
ckfree(str);
|
|
str = NULL;
|
|
INTON;
|
|
}
|
|
parsebackquote = savepbq;
|
|
handler = savehandler;
|
|
if (arinest || dblquote)
|
|
USTPUTC(CTLBACKQ | CTLQUOTE, out);
|
|
else
|
|
USTPUTC(CTLBACKQ, out);
|
|
if (oldstyle)
|
|
goto parsebackq_oldreturn;
|
|
else
|
|
goto parsebackq_newreturn;
|
|
}
|
|
|
|
/*
|
|
* Parse an arithmetic expansion (indicate start of one and set state)
|
|
*/
|
|
parsearith: {
|
|
|
|
if (++arinest == 1) {
|
|
prevsyntax = syntax;
|
|
syntax = ARISYNTAX;
|
|
USTPUTC(CTLARI, out);
|
|
if (dblquote)
|
|
USTPUTC('"',out);
|
|
else
|
|
USTPUTC(' ',out);
|
|
} else {
|
|
/*
|
|
* we collapse embedded arithmetic expansion to
|
|
* parenthesis, which should be equivalent
|
|
*/
|
|
USTPUTC('(', out);
|
|
}
|
|
goto parsearith_return;
|
|
}
|
|
|
|
} /* end of readtoken */
|
|
|
|
|
|
/*
|
|
* Returns true if the text contains nothing to expand (no dollar signs
|
|
* or backquotes).
|
|
*/
|
|
|
|
static int
|
|
noexpand(text)
|
|
char *text;
|
|
{
|
|
char *p;
|
|
char c;
|
|
|
|
p = text;
|
|
while ((c = *p++) != '\0') {
|
|
if (c == CTLQUOTEMARK)
|
|
continue;
|
|
if (c == CTLESC)
|
|
p++;
|
|
else if (SIT(c,BASESYNTAX) == CCTL)
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Return true if the argument is a legal variable name (a letter or
|
|
* underscore followed by zero or more letters, underscores, and digits).
|
|
*/
|
|
|
|
static int
|
|
goodname(const char *name)
|
|
{
|
|
const char *p;
|
|
|
|
p = name;
|
|
if (! is_name(*p))
|
|
return 0;
|
|
while (*++p) {
|
|
if (! is_in_name(*p))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* Called when an unexpected token is read during the parse. The argument
|
|
* is the token that is expected, or -1 if more than one type of token can
|
|
* occur at this point.
|
|
*/
|
|
|
|
static void
|
|
synexpect(token)
|
|
int token;
|
|
{
|
|
char msg[64];
|
|
int l;
|
|
|
|
l = sprintf(msg, "%s unexpected", tokname(lasttoken));
|
|
if (token >= 0)
|
|
sprintf(msg+l, " (expecting %s)", tokname(token));
|
|
synerror(msg);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
static void
|
|
synerror(const char *msg)
|
|
{
|
|
if (commandname)
|
|
out2fmt("%s: %d: ", commandname, startlinno);
|
|
out2fmt("Syntax error: %s\n", msg);
|
|
error((char *)NULL);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
|
|
/*
|
|
* called by editline -- any expansions to the prompt
|
|
* should be added here.
|
|
*/
|
|
static void
|
|
setprompt(int whichprompt)
|
|
{
|
|
char *prompt;
|
|
switch (whichprompt) {
|
|
case 1:
|
|
prompt = ps1val();
|
|
break;
|
|
case 2:
|
|
prompt = ps2val();
|
|
break;
|
|
default: /* 0 */
|
|
prompt = "";
|
|
}
|
|
putprompt(prompt);
|
|
}
|
|
|
|
|
|
/*
|
|
* Code for dealing with input/output redirection.
|
|
*/
|
|
|
|
#define EMPTY -2 /* marks an unused slot in redirtab */
|
|
#ifndef PIPE_BUF
|
|
# define PIPESIZE 4096 /* amount of buffering in a pipe */
|
|
#else
|
|
# define PIPESIZE PIPE_BUF
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Open a file in noclobber mode.
|
|
* The code was copied from bash.
|
|
*/
|
|
static inline int
|
|
noclobberopen(const char *fname)
|
|
{
|
|
int r, fd;
|
|
struct stat finfo, finfo2;
|
|
|
|
/*
|
|
* If the file exists and is a regular file, return an error
|
|
* immediately.
|
|
*/
|
|
r = stat(fname, &finfo);
|
|
if (r == 0 && S_ISREG(finfo.st_mode)) {
|
|
errno = EEXIST;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* If the file was not present (r != 0), make sure we open it
|
|
* exclusively so that if it is created before we open it, our open
|
|
* will fail. Make sure that we do not truncate an existing file.
|
|
* Note that we don't turn on O_EXCL unless the stat failed -- if the
|
|
* file was not a regular file, we leave O_EXCL off.
|
|
*/
|
|
if (r != 0)
|
|
return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
|
|
fd = open(fname, O_WRONLY|O_CREAT, 0666);
|
|
|
|
/* If the open failed, return the file descriptor right away. */
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
/*
|
|
* OK, the open succeeded, but the file may have been changed from a
|
|
* non-regular file to a regular file between the stat and the open.
|
|
* We are assuming that the O_EXCL open handles the case where FILENAME
|
|
* did not exist and is symlinked to an existing file between the stat
|
|
* and open.
|
|
*/
|
|
|
|
/*
|
|
* If we can open it and fstat the file descriptor, and neither check
|
|
* revealed that it was a regular file, and the file has not been
|
|
* replaced, return the file descriptor.
|
|
*/
|
|
if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) &&
|
|
finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
|
|
return fd;
|
|
|
|
/* The file has been replaced. badness. */
|
|
close(fd);
|
|
errno = EEXIST;
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Handle here documents. Normally we fork off a process to write the
|
|
* data to a pipe. If the document is short, we can stuff the data in
|
|
* the pipe without forking.
|
|
*/
|
|
|
|
static inline int
|
|
openhere(const union node *redir)
|
|
{
|
|
int pip[2];
|
|
int len = 0;
|
|
|
|
if (pipe(pip) < 0)
|
|
error("Pipe call failed");
|
|
if (redir->type == NHERE) {
|
|
len = strlen(redir->nhere.doc->narg.text);
|
|
if (len <= PIPESIZE) {
|
|
xwrite(pip[1], redir->nhere.doc->narg.text, len);
|
|
goto out;
|
|
}
|
|
}
|
|
if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
|
|
close(pip[0]);
|
|
signal(SIGINT, SIG_IGN);
|
|
signal(SIGQUIT, SIG_IGN);
|
|
signal(SIGHUP, SIG_IGN);
|
|
#ifdef SIGTSTP
|
|
signal(SIGTSTP, SIG_IGN);
|
|
#endif
|
|
signal(SIGPIPE, SIG_DFL);
|
|
if (redir->type == NHERE)
|
|
xwrite(pip[1], redir->nhere.doc->narg.text, len);
|
|
else
|
|
expandhere(redir->nhere.doc, pip[1]);
|
|
_exit(0);
|
|
}
|
|
out:
|
|
close(pip[1]);
|
|
return pip[0];
|
|
}
|
|
|
|
|
|
static inline int
|
|
openredirect(const union node *redir)
|
|
{
|
|
char *fname;
|
|
int f;
|
|
|
|
switch (redir->nfile.type) {
|
|
case NFROM:
|
|
fname = redir->nfile.expfname;
|
|
if ((f = open(fname, O_RDONLY)) < 0)
|
|
goto eopen;
|
|
break;
|
|
case NFROMTO:
|
|
fname = redir->nfile.expfname;
|
|
if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
|
|
goto ecreate;
|
|
break;
|
|
case NTO:
|
|
/* Take care of noclobber mode. */
|
|
if (Cflag) {
|
|
fname = redir->nfile.expfname;
|
|
if ((f = noclobberopen(fname)) < 0)
|
|
goto ecreate;
|
|
break;
|
|
}
|
|
case NTOOV:
|
|
fname = redir->nfile.expfname;
|
|
#ifdef O_CREAT
|
|
if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
|
|
goto ecreate;
|
|
#else
|
|
if ((f = creat(fname, 0666)) < 0)
|
|
goto ecreate;
|
|
#endif
|
|
break;
|
|
case NAPPEND:
|
|
fname = redir->nfile.expfname;
|
|
#ifdef O_APPEND
|
|
if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
|
|
goto ecreate;
|
|
#else
|
|
if ((f = open(fname, O_WRONLY)) < 0
|
|
&& (f = creat(fname, 0666)) < 0)
|
|
goto ecreate;
|
|
lseek(f, (off_t)0, 2);
|
|
#endif
|
|
break;
|
|
default:
|
|
#ifdef DEBUG
|
|
abort();
|
|
#endif
|
|
/* Fall through to eliminate warning. */
|
|
case NTOFD:
|
|
case NFROMFD:
|
|
f = -1;
|
|
break;
|
|
case NHERE:
|
|
case NXHERE:
|
|
f = openhere(redir);
|
|
break;
|
|
}
|
|
|
|
return f;
|
|
ecreate:
|
|
error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
|
|
eopen:
|
|
error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
|
|
}
|
|
|
|
|
|
/*
|
|
* Process a list of redirection commands. If the REDIR_PUSH flag is set,
|
|
* old file descriptors are stashed away so that the redirection can be
|
|
* undone by calling popredir. If the REDIR_BACKQ flag is set, then the
|
|
* standard output, and the standard error if it becomes a duplicate of
|
|
* stdout.
|
|
*/
|
|
|
|
static void
|
|
redirect(union node *redir, int flags)
|
|
{
|
|
union node *n;
|
|
struct redirtab *sv = NULL;
|
|
int i;
|
|
int fd;
|
|
int newfd;
|
|
int try;
|
|
int fd1dup = flags & REDIR_BACKQ;; /* stdout `cmd` redir to pipe */
|
|
|
|
if (flags & REDIR_PUSH) {
|
|
sv = ckmalloc(sizeof (struct redirtab));
|
|
for (i = 0 ; i < 10 ; i++)
|
|
sv->renamed[i] = EMPTY;
|
|
sv->next = redirlist;
|
|
redirlist = sv;
|
|
}
|
|
for (n = redir ; n ; n = n->nfile.next) {
|
|
fd = n->nfile.fd;
|
|
try = 0;
|
|
if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) &&
|
|
n->ndup.dupfd == fd)
|
|
continue; /* redirect from/to same file descriptor */
|
|
|
|
INTOFF;
|
|
newfd = openredirect(n);
|
|
if ((flags & REDIR_PUSH) && sv->renamed[fd] == EMPTY) {
|
|
if (newfd == fd) {
|
|
try++;
|
|
} else if ((i = fcntl(fd, F_DUPFD, 10)) == -1) {
|
|
switch (errno) {
|
|
case EBADF:
|
|
if (!try) {
|
|
dupredirect(n, newfd, fd1dup);
|
|
try++;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH*/
|
|
default:
|
|
if (newfd >= 0) {
|
|
close(newfd);
|
|
}
|
|
INTON;
|
|
error("%d: %m", fd);
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
if (!try) {
|
|
close(fd);
|
|
if (flags & REDIR_PUSH) {
|
|
sv->renamed[fd] = i;
|
|
}
|
|
}
|
|
} else if (fd != newfd) {
|
|
close(fd);
|
|
}
|
|
if (fd == 0)
|
|
fd0_redirected++;
|
|
if (!try)
|
|
dupredirect(n, newfd, fd1dup);
|
|
INTON;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
dupredirect(const union node *redir, int f, int fd1dup)
|
|
{
|
|
int fd = redir->nfile.fd;
|
|
|
|
if(fd==1)
|
|
fd1dup = 0;
|
|
if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
|
|
if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
|
|
if (redir->ndup.dupfd!=1 || fd1dup!=1)
|
|
dup_as_newfd(redir->ndup.dupfd, fd);
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (f != fd) {
|
|
dup_as_newfd(f, fd);
|
|
close(f);
|
|
}
|
|
return;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Undo the effects of the last redirection.
|
|
*/
|
|
|
|
static void
|
|
popredir(void)
|
|
{
|
|
struct redirtab *rp = redirlist;
|
|
int i;
|
|
|
|
INTOFF;
|
|
for (i = 0 ; i < 10 ; i++) {
|
|
if (rp->renamed[i] != EMPTY) {
|
|
if (i == 0)
|
|
fd0_redirected--;
|
|
close(i);
|
|
if (rp->renamed[i] >= 0) {
|
|
dup_as_newfd(rp->renamed[i], i);
|
|
close(rp->renamed[i]);
|
|
}
|
|
}
|
|
}
|
|
redirlist = rp->next;
|
|
ckfree(rp);
|
|
INTON;
|
|
}
|
|
|
|
/*
|
|
* Discard all saved file descriptors.
|
|
*/
|
|
|
|
static void
|
|
clearredir(void) {
|
|
struct redirtab *rp;
|
|
int i;
|
|
|
|
for (rp = redirlist ; rp ; rp = rp->next) {
|
|
for (i = 0 ; i < 10 ; i++) {
|
|
if (rp->renamed[i] >= 0) {
|
|
close(rp->renamed[i]);
|
|
}
|
|
rp->renamed[i] = EMPTY;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Copy a file descriptor to be >= to. Returns -1
|
|
* if the source file descriptor is closed, EMPTY if there are no unused
|
|
* file descriptors left.
|
|
*/
|
|
|
|
static int
|
|
dup_as_newfd(from, to)
|
|
int from;
|
|
int to;
|
|
{
|
|
int newfd;
|
|
|
|
newfd = fcntl(from, F_DUPFD, to);
|
|
if (newfd < 0) {
|
|
if (errno == EMFILE)
|
|
return EMPTY;
|
|
else
|
|
error("%d: %m", from);
|
|
}
|
|
return newfd;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static void shtree (union node *, int, char *, FILE*);
|
|
static void shcmd (union node *, FILE *);
|
|
static void sharg (union node *, FILE *);
|
|
static void indent (int, char *, FILE *);
|
|
static void trstring (char *);
|
|
|
|
|
|
static void
|
|
showtree(n)
|
|
union node *n;
|
|
{
|
|
trputs("showtree called\n");
|
|
shtree(n, 1, NULL, stdout);
|
|
}
|
|
|
|
|
|
static void
|
|
shtree(n, ind, pfx, fp)
|
|
union node *n;
|
|
int ind;
|
|
char *pfx;
|
|
FILE *fp;
|
|
{
|
|
struct nodelist *lp;
|
|
const char *s;
|
|
|
|
if (n == NULL)
|
|
return;
|
|
|
|
indent(ind, pfx, fp);
|
|
switch(n->type) {
|
|
case NSEMI:
|
|
s = "; ";
|
|
goto binop;
|
|
case NAND:
|
|
s = " && ";
|
|
goto binop;
|
|
case NOR:
|
|
s = " || ";
|
|
binop:
|
|
shtree(n->nbinary.ch1, ind, NULL, fp);
|
|
/* if (ind < 0) */
|
|
fputs(s, fp);
|
|
shtree(n->nbinary.ch2, ind, NULL, fp);
|
|
break;
|
|
case NCMD:
|
|
shcmd(n, fp);
|
|
if (ind >= 0)
|
|
putc('\n', fp);
|
|
break;
|
|
case NPIPE:
|
|
for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
|
|
shcmd(lp->n, fp);
|
|
if (lp->next)
|
|
fputs(" | ", fp);
|
|
}
|
|
if (n->npipe.backgnd)
|
|
fputs(" &", fp);
|
|
if (ind >= 0)
|
|
putc('\n', fp);
|
|
break;
|
|
default:
|
|
fprintf(fp, "<node type %d>", n->type);
|
|
if (ind >= 0)
|
|
putc('\n', fp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
shcmd(cmd, fp)
|
|
union node *cmd;
|
|
FILE *fp;
|
|
{
|
|
union node *np;
|
|
int first;
|
|
const char *s;
|
|
int dftfd;
|
|
|
|
first = 1;
|
|
for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
|
|
if (! first)
|
|
putchar(' ');
|
|
sharg(np, fp);
|
|
first = 0;
|
|
}
|
|
for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
|
|
if (! first)
|
|
putchar(' ');
|
|
#if 1
|
|
s = "*error*";
|
|
dftfd = 0;
|
|
if ((np->nfile.type <= NFROMFD) && (np->nfile.type >= NTO)) {
|
|
s = redir_strings[np->nfile.type - NTO];
|
|
if (*s == '>') {
|
|
dftfd = 1;
|
|
}
|
|
}
|
|
#else
|
|
switch (np->nfile.type) {
|
|
case NTO: s = ">"; dftfd = 1; break;
|
|
case NAPPEND: s = ">>"; dftfd = 1; break;
|
|
case NTOFD: s = ">&"; dftfd = 1; break;
|
|
case NTOOV: s = ">|"; dftfd = 1; break;
|
|
case NFROM: s = "<"; dftfd = 0; break;
|
|
case NFROMFD: s = "<&"; dftfd = 0; break;
|
|
case NFROMTO: s = "<>"; dftfd = 0; break;
|
|
default: s = "*error*"; dftfd = 0; break;
|
|
}
|
|
#endif
|
|
if (np->nfile.fd != dftfd)
|
|
fprintf(fp, "%d", np->nfile.fd);
|
|
fputs(s, fp);
|
|
if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
|
|
fprintf(fp, "%d", np->ndup.dupfd);
|
|
} else {
|
|
sharg(np->nfile.fname, fp);
|
|
}
|
|
first = 0;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
sharg(arg, fp)
|
|
union node *arg;
|
|
FILE *fp;
|
|
{
|
|
char *p;
|
|
struct nodelist *bqlist;
|
|
int subtype;
|
|
|
|
if (arg->type != NARG) {
|
|
printf("<node type %d>\n", arg->type);
|
|
fflush(stdout);
|
|
abort();
|
|
}
|
|
bqlist = arg->narg.backquote;
|
|
for (p = arg->narg.text ; *p ; p++) {
|
|
switch (*p) {
|
|
case CTLESC:
|
|
putc(*++p, fp);
|
|
break;
|
|
case CTLVAR:
|
|
putc('$', fp);
|
|
putc('{', fp);
|
|
subtype = *++p;
|
|
if (subtype == VSLENGTH)
|
|
putc('#', fp);
|
|
|
|
while (*p != '=')
|
|
putc(*p++, fp);
|
|
|
|
if (subtype & VSNUL)
|
|
putc(':', fp);
|
|
|
|
switch (subtype & VSTYPE) {
|
|
case VSNORMAL:
|
|
putc('}', fp);
|
|
break;
|
|
case VSMINUS:
|
|
putc('-', fp);
|
|
break;
|
|
case VSPLUS:
|
|
putc('+', fp);
|
|
break;
|
|
case VSQUESTION:
|
|
putc('?', fp);
|
|
break;
|
|
case VSASSIGN:
|
|
putc('=', fp);
|
|
break;
|
|
case VSTRIMLEFT:
|
|
putc('#', fp);
|
|
break;
|
|
case VSTRIMLEFTMAX:
|
|
putc('#', fp);
|
|
putc('#', fp);
|
|
break;
|
|
case VSTRIMRIGHT:
|
|
putc('%', fp);
|
|
break;
|
|
case VSTRIMRIGHTMAX:
|
|
putc('%', fp);
|
|
putc('%', fp);
|
|
break;
|
|
case VSLENGTH:
|
|
break;
|
|
default:
|
|
printf("<subtype %d>", subtype);
|
|
}
|
|
break;
|
|
case CTLENDVAR:
|
|
putc('}', fp);
|
|
break;
|
|
case CTLBACKQ:
|
|
case CTLBACKQ|CTLQUOTE:
|
|
putc('$', fp);
|
|
putc('(', fp);
|
|
shtree(bqlist->n, -1, NULL, fp);
|
|
putc(')', fp);
|
|
break;
|
|
default:
|
|
putc(*p, fp);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
indent(amount, pfx, fp)
|
|
int amount;
|
|
char *pfx;
|
|
FILE *fp;
|
|
{
|
|
int i;
|
|
|
|
for (i = 0 ; i < amount ; i++) {
|
|
if (pfx && i == amount - 1)
|
|
fputs(pfx, fp);
|
|
putc('\t', fp);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
* Debugging stuff.
|
|
*/
|
|
|
|
|
|
#ifdef DEBUG
|
|
FILE *tracefile;
|
|
|
|
#if DEBUG == 2
|
|
static int debug = 1;
|
|
#else
|
|
static int debug = 0;
|
|
#endif
|
|
|
|
|
|
static void
|
|
trputc(c)
|
|
int c;
|
|
{
|
|
if (tracefile == NULL)
|
|
return;
|
|
putc(c, tracefile);
|
|
if (c == '\n')
|
|
fflush(tracefile);
|
|
}
|
|
|
|
static void
|
|
trace(const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
va_start(va, fmt);
|
|
if (tracefile != NULL) {
|
|
(void) vfprintf(tracefile, fmt, va);
|
|
if (strchr(fmt, '\n'))
|
|
(void) fflush(tracefile);
|
|
}
|
|
va_end(va);
|
|
}
|
|
|
|
|
|
static void
|
|
trputs(s)
|
|
const char *s;
|
|
{
|
|
if (tracefile == NULL)
|
|
return;
|
|
fputs(s, tracefile);
|
|
if (strchr(s, '\n'))
|
|
fflush(tracefile);
|
|
}
|
|
|
|
|
|
static void
|
|
trstring(s)
|
|
char *s;
|
|
{
|
|
char *p;
|
|
char c;
|
|
|
|
if (tracefile == NULL)
|
|
return;
|
|
putc('"', tracefile);
|
|
for (p = s ; *p ; p++) {
|
|
switch (*p) {
|
|
case '\n': c = 'n'; goto backslash;
|
|
case '\t': c = 't'; goto backslash;
|
|
case '\r': c = 'r'; goto backslash;
|
|
case '"': c = '"'; goto backslash;
|
|
case '\\': c = '\\'; goto backslash;
|
|
case CTLESC: c = 'e'; goto backslash;
|
|
case CTLVAR: c = 'v'; goto backslash;
|
|
case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
|
|
case CTLBACKQ: c = 'q'; goto backslash;
|
|
case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
|
|
backslash: putc('\\', tracefile);
|
|
putc(c, tracefile);
|
|
break;
|
|
default:
|
|
if (*p >= ' ' && *p <= '~')
|
|
putc(*p, tracefile);
|
|
else {
|
|
putc('\\', tracefile);
|
|
putc(*p >> 6 & 03, tracefile);
|
|
putc(*p >> 3 & 07, tracefile);
|
|
putc(*p & 07, tracefile);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
putc('"', tracefile);
|
|
}
|
|
|
|
|
|
static void
|
|
trargs(ap)
|
|
char **ap;
|
|
{
|
|
if (tracefile == NULL)
|
|
return;
|
|
while (*ap) {
|
|
trstring(*ap++);
|
|
if (*ap)
|
|
putc(' ', tracefile);
|
|
else
|
|
putc('\n', tracefile);
|
|
}
|
|
fflush(tracefile);
|
|
}
|
|
|
|
|
|
static void
|
|
opentrace() {
|
|
char s[100];
|
|
#ifdef O_APPEND
|
|
int flags;
|
|
#endif
|
|
|
|
if (!debug)
|
|
return;
|
|
#ifdef not_this_way
|
|
{
|
|
char *p;
|
|
if ((p = getenv("HOME")) == NULL) {
|
|
if (geteuid() == 0)
|
|
p = "/";
|
|
else
|
|
p = "/tmp";
|
|
}
|
|
strcpy(s, p);
|
|
strcat(s, "/trace");
|
|
}
|
|
#else
|
|
strcpy(s, "./trace");
|
|
#endif /* not_this_way */
|
|
if ((tracefile = fopen(s, "a")) == NULL) {
|
|
fprintf(stderr, "Can't open %s\n", s);
|
|
return;
|
|
}
|
|
#ifdef O_APPEND
|
|
if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
|
|
fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
|
|
#endif
|
|
fputs("\nTracing started.\n", tracefile);
|
|
fflush(tracefile);
|
|
}
|
|
#endif /* DEBUG */
|
|
|
|
|
|
/*
|
|
* The trap builtin.
|
|
*/
|
|
|
|
static int
|
|
trapcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
char *action;
|
|
char **ap;
|
|
int signo;
|
|
|
|
if (argc <= 1) {
|
|
for (signo = 0 ; signo < NSIG ; signo++) {
|
|
if (trap[signo] != NULL) {
|
|
char *p;
|
|
const char *sn;
|
|
|
|
p = single_quote(trap[signo]);
|
|
sn = sys_siglist[signo];
|
|
if(sn==NULL)
|
|
sn = u_signal_names(0, &signo, 0);
|
|
if(sn==NULL)
|
|
sn = "???";
|
|
printf("trap -- %s %s\n", p, sn);
|
|
stunalloc(p);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
ap = argv + 1;
|
|
if (argc == 2)
|
|
action = NULL;
|
|
else
|
|
action = *ap++;
|
|
while (*ap) {
|
|
if ((signo = decode_signal(*ap, 0)) < 0)
|
|
error("%s: bad trap", *ap);
|
|
INTOFF;
|
|
if (action) {
|
|
if (action[0] == '-' && action[1] == '\0')
|
|
action = NULL;
|
|
else
|
|
action = savestr(action);
|
|
}
|
|
if (trap[signo])
|
|
ckfree(trap[signo]);
|
|
trap[signo] = action;
|
|
if (signo != 0)
|
|
setsignal(signo);
|
|
INTON;
|
|
ap++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
* Set the signal handler for the specified signal. The routine figures
|
|
* out what it should be set to.
|
|
*/
|
|
|
|
static void
|
|
setsignal(int signo)
|
|
{
|
|
int action;
|
|
char *t;
|
|
struct sigaction act;
|
|
|
|
if ((t = trap[signo]) == NULL)
|
|
action = S_DFL;
|
|
else if (*t != '\0')
|
|
action = S_CATCH;
|
|
else
|
|
action = S_IGN;
|
|
if (rootshell && action == S_DFL) {
|
|
switch (signo) {
|
|
case SIGINT:
|
|
if (iflag || minusc || sflag == 0)
|
|
action = S_CATCH;
|
|
break;
|
|
case SIGQUIT:
|
|
#ifdef DEBUG
|
|
{
|
|
|
|
if (debug)
|
|
break;
|
|
}
|
|
#endif
|
|
/* FALLTHROUGH */
|
|
case SIGTERM:
|
|
if (iflag)
|
|
action = S_IGN;
|
|
break;
|
|
#ifdef JOBS
|
|
case SIGTSTP:
|
|
case SIGTTOU:
|
|
if (mflag)
|
|
action = S_IGN;
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
t = &sigmode[signo - 1];
|
|
if (*t == 0) {
|
|
/*
|
|
* current setting unknown
|
|
*/
|
|
if (sigaction(signo, 0, &act) == -1) {
|
|
/*
|
|
* Pretend it worked; maybe we should give a warning
|
|
* here, but other shells don't. We don't alter
|
|
* sigmode, so that we retry every time.
|
|
*/
|
|
return;
|
|
}
|
|
if (act.sa_handler == SIG_IGN) {
|
|
if (mflag && (signo == SIGTSTP ||
|
|
signo == SIGTTIN || signo == SIGTTOU)) {
|
|
*t = S_IGN; /* don't hard ignore these */
|
|
} else
|
|
*t = S_HARD_IGN;
|
|
} else {
|
|
*t = S_RESET; /* force to be set */
|
|
}
|
|
}
|
|
if (*t == S_HARD_IGN || *t == action)
|
|
return;
|
|
act.sa_handler = ((action == S_CATCH) ? onsig
|
|
: ((action == S_IGN) ? SIG_IGN : SIG_DFL));
|
|
*t = action;
|
|
act.sa_flags = 0;
|
|
sigemptyset(&act.sa_mask);
|
|
sigaction(signo, &act, 0);
|
|
}
|
|
|
|
/*
|
|
* Ignore a signal.
|
|
*/
|
|
|
|
static void
|
|
ignoresig(signo)
|
|
int signo;
|
|
{
|
|
if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
|
|
signal(signo, SIG_IGN);
|
|
}
|
|
sigmode[signo - 1] = S_HARD_IGN;
|
|
}
|
|
|
|
|
|
/*
|
|
* Signal handler.
|
|
*/
|
|
|
|
static void
|
|
onsig(int signo)
|
|
{
|
|
if (signo == SIGINT && trap[SIGINT] == NULL) {
|
|
onint();
|
|
return;
|
|
}
|
|
gotsig[signo - 1] = 1;
|
|
pendingsigs++;
|
|
}
|
|
|
|
|
|
/*
|
|
* Called to execute a trap. Perhaps we should avoid entering new trap
|
|
* handlers while we are executing a trap handler.
|
|
*/
|
|
|
|
static void
|
|
dotrap(void)
|
|
{
|
|
int i;
|
|
int savestatus;
|
|
|
|
for (;;) {
|
|
for (i = 1 ; ; i++) {
|
|
if (gotsig[i - 1])
|
|
break;
|
|
if (i >= NSIG - 1)
|
|
goto done;
|
|
}
|
|
gotsig[i - 1] = 0;
|
|
savestatus=exitstatus;
|
|
evalstring(trap[i], 0);
|
|
exitstatus=savestatus;
|
|
}
|
|
done:
|
|
pendingsigs = 0;
|
|
}
|
|
|
|
/*
|
|
* Called to exit the shell.
|
|
*/
|
|
|
|
static void
|
|
exitshell(int status)
|
|
{
|
|
struct jmploc loc1, loc2;
|
|
char *p;
|
|
|
|
TRACE(("exitshell(%d) pid=%d\n", status, getpid()));
|
|
if (setjmp(loc1.loc)) {
|
|
goto l1;
|
|
}
|
|
if (setjmp(loc2.loc)) {
|
|
goto l2;
|
|
}
|
|
handler = &loc1;
|
|
if ((p = trap[0]) != NULL && *p != '\0') {
|
|
trap[0] = NULL;
|
|
evalstring(p, 0);
|
|
}
|
|
l1: handler = &loc2; /* probably unnecessary */
|
|
flushall();
|
|
#ifdef JOBS
|
|
setjobctl(0);
|
|
#endif
|
|
l2: _exit(status);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static int decode_signal(const char *string, int minsig)
|
|
{
|
|
int signo;
|
|
const char *name = u_signal_names(string, &signo, minsig);
|
|
|
|
return name ? signo : -1;
|
|
}
|
|
|
|
static struct var **hashvar (const char *);
|
|
static void showvars (const char *, int, int);
|
|
static struct var **findvar (struct var **, const char *);
|
|
|
|
/*
|
|
* Initialize the varable symbol tables and import the environment
|
|
*/
|
|
|
|
/*
|
|
* This routine initializes the builtin variables. It is called when the
|
|
* shell is initialized and again when a shell procedure is spawned.
|
|
*/
|
|
|
|
static void
|
|
initvar() {
|
|
const struct varinit *ip;
|
|
struct var *vp;
|
|
struct var **vpp;
|
|
|
|
for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
|
|
if ((vp->flags & VEXPORT) == 0) {
|
|
vpp = hashvar(ip->text);
|
|
vp->next = *vpp;
|
|
*vpp = vp;
|
|
vp->text = strdup(ip->text);
|
|
vp->flags = ip->flags;
|
|
vp->func = ip->func;
|
|
}
|
|
}
|
|
/*
|
|
* PS1 depends on uid
|
|
*/
|
|
if ((vps1.flags & VEXPORT) == 0) {
|
|
vpp = hashvar("PS1=");
|
|
vps1.next = *vpp;
|
|
*vpp = &vps1;
|
|
vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
|
|
vps1.flags = VSTRFIXED|VTEXTFIXED;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set the value of a variable. The flags argument is ored with the
|
|
* flags of the variable. If val is NULL, the variable is unset.
|
|
*/
|
|
|
|
static void
|
|
setvar(name, val, flags)
|
|
const char *name, *val;
|
|
int flags;
|
|
{
|
|
const char *p;
|
|
int len;
|
|
int namelen;
|
|
char *nameeq;
|
|
int isbad;
|
|
int vallen = 0;
|
|
|
|
isbad = 0;
|
|
p = name;
|
|
if (! is_name(*p))
|
|
isbad = 1;
|
|
p++;
|
|
for (;;) {
|
|
if (! is_in_name(*p)) {
|
|
if (*p == '\0' || *p == '=')
|
|
break;
|
|
isbad = 1;
|
|
}
|
|
p++;
|
|
}
|
|
namelen = p - name;
|
|
if (isbad)
|
|
error("%.*s: bad variable name", namelen, name);
|
|
len = namelen + 2; /* 2 is space for '=' and '\0' */
|
|
if (val == NULL) {
|
|
flags |= VUNSET;
|
|
} else {
|
|
len += vallen = strlen(val);
|
|
}
|
|
INTOFF;
|
|
nameeq = ckmalloc(len);
|
|
memcpy(nameeq, name, namelen);
|
|
nameeq[namelen] = '=';
|
|
if (val) {
|
|
memcpy(nameeq + namelen + 1, val, vallen + 1);
|
|
} else {
|
|
nameeq[namelen + 1] = '\0';
|
|
}
|
|
setvareq(nameeq, flags);
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Same as setvar except that the variable and value are passed in
|
|
* the first argument as name=value. Since the first argument will
|
|
* be actually stored in the table, it should not be a string that
|
|
* will go away.
|
|
*/
|
|
|
|
static void
|
|
setvareq(s, flags)
|
|
char *s;
|
|
int flags;
|
|
{
|
|
struct var *vp, **vpp;
|
|
|
|
vpp = hashvar(s);
|
|
flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
|
|
if ((vp = *findvar(vpp, s))) {
|
|
if (vp->flags & VREADONLY) {
|
|
size_t len = strchr(s, '=') - s;
|
|
error("%.*s: is read only", len, s);
|
|
}
|
|
INTOFF;
|
|
|
|
if (vp->func && (flags & VNOFUNC) == 0)
|
|
(*vp->func)(strchr(s, '=') + 1);
|
|
|
|
if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
|
|
ckfree(vp->text);
|
|
|
|
vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
|
|
vp->flags |= flags;
|
|
vp->text = s;
|
|
|
|
/*
|
|
* We could roll this to a function, to handle it as
|
|
* a regular variable function callback, but why bother?
|
|
*/
|
|
if (iflag && (vp == &vmpath || (vp == &vmail && !mpathset())))
|
|
chkmail(1);
|
|
INTON;
|
|
return;
|
|
}
|
|
/* not found */
|
|
vp = ckmalloc(sizeof (*vp));
|
|
vp->flags = flags;
|
|
vp->text = s;
|
|
vp->next = *vpp;
|
|
vp->func = NULL;
|
|
*vpp = vp;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Process a linked list of variable assignments.
|
|
*/
|
|
|
|
static void
|
|
listsetvar(mylist)
|
|
struct strlist *mylist;
|
|
{
|
|
struct strlist *lp;
|
|
|
|
INTOFF;
|
|
for (lp = mylist ; lp ; lp = lp->next) {
|
|
setvareq(savestr(lp->text), 0);
|
|
}
|
|
INTON;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Find the value of a variable. Returns NULL if not set.
|
|
*/
|
|
|
|
static const char *
|
|
lookupvar(name)
|
|
const char *name;
|
|
{
|
|
struct var *v;
|
|
|
|
if ((v = *findvar(hashvar(name), name)) && !(v->flags & VUNSET)) {
|
|
return strchr(v->text, '=') + 1;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Search the environment of a builtin command.
|
|
*/
|
|
|
|
static const char *
|
|
bltinlookup(const char *name)
|
|
{
|
|
const struct strlist *sp;
|
|
|
|
for (sp = cmdenviron ; sp ; sp = sp->next) {
|
|
if (varequal(sp->text, name))
|
|
return strchr(sp->text, '=') + 1;
|
|
}
|
|
return lookupvar(name);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Generate a list of exported variables. This routine is used to construct
|
|
* the third argument to execve when executing a program.
|
|
*/
|
|
|
|
static char **
|
|
environment() {
|
|
int nenv;
|
|
struct var **vpp;
|
|
struct var *vp;
|
|
char **env;
|
|
char **ep;
|
|
|
|
nenv = 0;
|
|
for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|
for (vp = *vpp ; vp ; vp = vp->next)
|
|
if (vp->flags & VEXPORT)
|
|
nenv++;
|
|
}
|
|
ep = env = stalloc((nenv + 1) * sizeof *env);
|
|
for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|
for (vp = *vpp ; vp ; vp = vp->next)
|
|
if (vp->flags & VEXPORT)
|
|
*ep++ = vp->text;
|
|
}
|
|
*ep = NULL;
|
|
return env;
|
|
}
|
|
|
|
|
|
/*
|
|
* Called when a shell procedure is invoked to clear out nonexported
|
|
* variables. It is also necessary to reallocate variables of with
|
|
* VSTACK set since these are currently allocated on the stack.
|
|
*/
|
|
|
|
static void
|
|
shprocvar(void) {
|
|
struct var **vpp;
|
|
struct var *vp, **prev;
|
|
|
|
for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|
for (prev = vpp ; (vp = *prev) != NULL ; ) {
|
|
if ((vp->flags & VEXPORT) == 0) {
|
|
*prev = vp->next;
|
|
if ((vp->flags & VTEXTFIXED) == 0)
|
|
ckfree(vp->text);
|
|
if ((vp->flags & VSTRFIXED) == 0)
|
|
ckfree(vp);
|
|
} else {
|
|
if (vp->flags & VSTACK) {
|
|
vp->text = savestr(vp->text);
|
|
vp->flags &=~ VSTACK;
|
|
}
|
|
prev = &vp->next;
|
|
}
|
|
}
|
|
}
|
|
initvar();
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Command to list all variables which are set. Currently this command
|
|
* is invoked from the set command when the set command is called without
|
|
* any variables.
|
|
*/
|
|
|
|
static int
|
|
showvarscmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
showvars(nullstr, VUNSET, VUNSET);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* The export and readonly commands.
|
|
*/
|
|
|
|
static int
|
|
exportcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
struct var *vp;
|
|
char *name;
|
|
const char *p;
|
|
int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
|
|
int pflag;
|
|
|
|
listsetvar(cmdenviron);
|
|
pflag = (nextopt("p") == 'p');
|
|
if (argc > 1 && !pflag) {
|
|
while ((name = *argptr++) != NULL) {
|
|
if ((p = strchr(name, '=')) != NULL) {
|
|
p++;
|
|
} else {
|
|
if ((vp = *findvar(hashvar(name), name))) {
|
|
vp->flags |= flag;
|
|
goto found;
|
|
}
|
|
}
|
|
setvar(name, p, flag);
|
|
found:;
|
|
}
|
|
} else {
|
|
showvars(argv[0], flag, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* The "local" command.
|
|
*/
|
|
|
|
/* funcnest nonzero if we are currently evaluating a function */
|
|
|
|
static int
|
|
localcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
char *name;
|
|
|
|
if (! funcnest)
|
|
error("Not in a function");
|
|
while ((name = *argptr++) != NULL) {
|
|
mklocal(name);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Make a variable a local variable. When a variable is made local, it's
|
|
* value and flags are saved in a localvar structure. The saved values
|
|
* will be restored when the shell function returns. We handle the name
|
|
* "-" as a special case.
|
|
*/
|
|
|
|
static void
|
|
mklocal(name)
|
|
char *name;
|
|
{
|
|
struct localvar *lvp;
|
|
struct var **vpp;
|
|
struct var *vp;
|
|
|
|
INTOFF;
|
|
lvp = ckmalloc(sizeof (struct localvar));
|
|
if (name[0] == '-' && name[1] == '\0') {
|
|
char *p;
|
|
p = ckmalloc(sizeof optet_vals);
|
|
lvp->text = memcpy(p, optet_vals, sizeof optet_vals);
|
|
vp = NULL;
|
|
} else {
|
|
vpp = hashvar(name);
|
|
vp = *findvar(vpp, name);
|
|
if (vp == NULL) {
|
|
if (strchr(name, '='))
|
|
setvareq(savestr(name), VSTRFIXED);
|
|
else
|
|
setvar(name, NULL, VSTRFIXED);
|
|
vp = *vpp; /* the new variable */
|
|
lvp->text = NULL;
|
|
lvp->flags = VUNSET;
|
|
} else {
|
|
lvp->text = vp->text;
|
|
lvp->flags = vp->flags;
|
|
vp->flags |= VSTRFIXED|VTEXTFIXED;
|
|
if (strchr(name, '='))
|
|
setvareq(savestr(name), 0);
|
|
}
|
|
}
|
|
lvp->vp = vp;
|
|
lvp->next = localvars;
|
|
localvars = lvp;
|
|
INTON;
|
|
}
|
|
|
|
|
|
/*
|
|
* Called after a function returns.
|
|
*/
|
|
|
|
static void
|
|
poplocalvars() {
|
|
struct localvar *lvp;
|
|
struct var *vp;
|
|
|
|
while ((lvp = localvars) != NULL) {
|
|
localvars = lvp->next;
|
|
vp = lvp->vp;
|
|
if (vp == NULL) { /* $- saved */
|
|
memcpy(optet_vals, lvp->text, sizeof optet_vals);
|
|
ckfree(lvp->text);
|
|
} else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
|
|
(void)unsetvar(vp->text);
|
|
} else {
|
|
if ((vp->flags & VTEXTFIXED) == 0)
|
|
ckfree(vp->text);
|
|
vp->flags = lvp->flags;
|
|
vp->text = lvp->text;
|
|
}
|
|
ckfree(lvp);
|
|
}
|
|
}
|
|
|
|
|
|
static int
|
|
setvarcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
if (argc <= 2)
|
|
return unsetcmd(argc, argv);
|
|
else if (argc == 3)
|
|
setvar(argv[1], argv[2], 0);
|
|
else
|
|
error("List assignment not implemented");
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* The unset builtin command. We unset the function before we unset the
|
|
* variable to allow a function to be unset when there is a readonly variable
|
|
* with the same name.
|
|
*/
|
|
|
|
static int
|
|
unsetcmd(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
char **ap;
|
|
int i;
|
|
int flg_func = 0;
|
|
int flg_var = 0;
|
|
int ret = 0;
|
|
|
|
while ((i = nextopt("vf")) != '\0') {
|
|
if (i == 'f')
|
|
flg_func = 1;
|
|
else
|
|
flg_var = 1;
|
|
}
|
|
if (flg_func == 0 && flg_var == 0)
|
|
flg_var = 1;
|
|
|
|
for (ap = argptr; *ap ; ap++) {
|
|
if (flg_func)
|
|
unsetfunc(*ap);
|
|
if (flg_var)
|
|
ret |= unsetvar(*ap);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Unset the specified variable.
|
|
*/
|
|
|
|
static int
|
|
unsetvar(const char *s)
|
|
{
|
|
struct var **vpp;
|
|
struct var *vp;
|
|
|
|
vpp = findvar(hashvar(s), s);
|
|
vp = *vpp;
|
|
if (vp) {
|
|
if (vp->flags & VREADONLY)
|
|
return (1);
|
|
INTOFF;
|
|
if (*(strchr(vp->text, '=') + 1) != '\0')
|
|
setvar(s, nullstr, 0);
|
|
vp->flags &= ~VEXPORT;
|
|
vp->flags |= VUNSET;
|
|
if ((vp->flags & VSTRFIXED) == 0) {
|
|
if ((vp->flags & VTEXTFIXED) == 0)
|
|
ckfree(vp->text);
|
|
*vpp = vp->next;
|
|
ckfree(vp);
|
|
}
|
|
INTON;
|
|
return (0);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Find the appropriate entry in the hash table from the name.
|
|
*/
|
|
|
|
static struct var **
|
|
hashvar(const char *p)
|
|
{
|
|
unsigned int hashval;
|
|
|
|
hashval = ((unsigned char) *p) << 4;
|
|
while (*p && *p != '=')
|
|
hashval += (unsigned char) *p++;
|
|
return &vartab[hashval % VTABSIZE];
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Returns true if the two strings specify the same varable. The first
|
|
* variable name is terminated by '='; the second may be terminated by
|
|
* either '=' or '\0'.
|
|
*/
|
|
|
|
static int
|
|
varequal(const char *p, const char *q)
|
|
{
|
|
while (*p == *q++) {
|
|
if (*p++ == '=')
|
|
return 1;
|
|
}
|
|
if (*p == '=' && *(q - 1) == '\0')
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
showvars(const char *myprefix, int mask, int xor)
|
|
{
|
|
struct var **vpp;
|
|
struct var *vp;
|
|
const char *sep = myprefix == nullstr ? myprefix : spcstr;
|
|
|
|
for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|
for (vp = *vpp ; vp ; vp = vp->next) {
|
|
if ((vp->flags & mask) ^ xor) {
|
|
char *p;
|
|
int len;
|
|
|
|
p = strchr(vp->text, '=') + 1;
|
|
len = p - vp->text;
|
|
p = single_quote(p);
|
|
|
|
printf("%s%s%.*s%s\n", myprefix, sep, len,
|
|
vp->text, p);
|
|
stunalloc(p);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct var **
|
|
findvar(struct var **vpp, const char *name)
|
|
{
|
|
for (; *vpp; vpp = &(*vpp)->next) {
|
|
if (varequal((*vpp)->text, name)) {
|
|
break;
|
|
}
|
|
}
|
|
return vpp;
|
|
}
|
|
|
|
/*
|
|
* Copyright (c) 1999 Herbert Xu <herbert@debian.org>
|
|
* This file contains code for the times builtin.
|
|
* $Id: ash.c,v 1.26 2001/10/18 04:11:38 andersen Exp $
|
|
*/
|
|
static int timescmd (int argc, char **argv)
|
|
{
|
|
struct tms buf;
|
|
long int clk_tck = sysconf(_SC_CLK_TCK);
|
|
|
|
times(&buf);
|
|
printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
|
|
(int) (buf.tms_utime / clk_tck / 60),
|
|
((double) buf.tms_utime) / clk_tck,
|
|
(int) (buf.tms_stime / clk_tck / 60),
|
|
((double) buf.tms_stime) / clk_tck,
|
|
(int) (buf.tms_cutime / clk_tck / 60),
|
|
((double) buf.tms_cutime) / clk_tck,
|
|
(int) (buf.tms_cstime / clk_tck / 60),
|
|
((double) buf.tms_cstime) / clk_tck);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef ASH_MATH_SUPPORT
|
|
/* The let builtin. */
|
|
int letcmd(int argc, char **argv)
|
|
{
|
|
int errcode;
|
|
long result=0;
|
|
if (argc == 2) {
|
|
char *tmp, *expression, p[13];
|
|
expression = strchr(argv[1], '=');
|
|
if (!expression) {
|
|
/* Cannot use 'error()' here, or the return code
|
|
* will be incorrect */
|
|
out2fmt("sh: let: syntax error: \"%s\"\n", argv[1]);
|
|
return 0;
|
|
}
|
|
*expression = '\0';
|
|
tmp = ++expression;
|
|
result = arith(tmp, &errcode);
|
|
if (errcode < 0) {
|
|
/* Cannot use 'error()' here, or the return code
|
|
* will be incorrect */
|
|
out2fmt("sh: let: ");
|
|
if(errcode == -2)
|
|
out2fmt("divide by zero");
|
|
else
|
|
out2fmt("syntax error: \"%s=%s\"\n", argv[1], expression);
|
|
return 0;
|
|
}
|
|
snprintf(p, 12, "%ld", result);
|
|
setvar(argv[1], savestr(p), 0);
|
|
} else if (argc >= 3)
|
|
synerror("invalid operand");
|
|
return !result;
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/*-
|
|
* Copyright (c) 1989, 1991, 1993, 1994
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Kenneth Almquist.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
|
|
* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
|
|
*
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|