400 lines
14 KiB
C
400 lines
14 KiB
C
/*
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* getopt.c - Enhanced implementation of BSD getopt(1)
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* Copyright (c) 1997, 1998, 1999, 2000 Frodo Looijaard <frodol@dds.nl>
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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
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* GNU 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* Version 1.0-b4: Tue Sep 23 1997. First public release.
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* Version 1.0: Wed Nov 19 1997.
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* Bumped up the version number to 1.0
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* Fixed minor typo (CSH instead of TCSH)
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* Version 1.0.1: Tue Jun 3 1998
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* Fixed sizeof instead of strlen bug
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* Bumped up the version number to 1.0.1
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* Version 1.0.2: Thu Jun 11 1998 (not present)
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* Fixed gcc-2.8.1 warnings
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* Fixed --version/-V option (not present)
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* Version 1.0.5: Tue Jun 22 1999
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* Make -u option work (not present)
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* Version 1.0.6: Tue Jun 27 2000
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* No important changes
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* Version 1.1.0: Tue Jun 30 2000
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* Added NLS support (partly written by Arkadiusz Mi<B6>kiewicz
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* <misiek@misiek.eu.org>)
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* Ported to Busybox - Alfred M. Szmidt <ams@trillian.itslinux.org>
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* Removed --version/-V and --help/-h in
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* Removed prase_error(), using error_msg() from Busybox instead
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* Replaced our_malloc with xmalloc and our_realloc with xrealloc
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*
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*/
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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 <unistd.h>
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#include <ctype.h>
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#include <getopt.h>
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#include "busybox.h"
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/* NON_OPT is the code that is returned when a non-option is found in '+'
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mode */
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static const int NON_OPT = 1;
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/* LONG_OPT is the code that is returned when a long option is found. */
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static const int LONG_OPT = 2;
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/* The shells recognized. */
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typedef enum {BASH,TCSH} shell_t;
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/* Some global variables that tells us how to parse. */
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static shell_t shell=BASH; /* The shell we generate output for. */
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static int quiet_errors=0; /* 0 is not quiet. */
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static int quiet_output=0; /* 0 is not quiet. */
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static int quote=1; /* 1 is do quote. */
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static int alternative=0; /* 0 is getopt_long, 1 is getopt_long_only */
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/* Function prototypes */
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static const char *normalize(const char *arg);
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static int generate_output(char * argv[],int argc,const char *optstr,
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const struct option *longopts);
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static void add_long_options(char *options);
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static void add_longopt(const char *name,int has_arg);
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static void set_shell(const char *new_shell);
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/*
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* This function 'normalizes' a single argument: it puts single quotes around
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* it and escapes other special characters. If quote is false, it just
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* returns its argument.
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* Bash only needs special treatment for single quotes; tcsh also recognizes
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* exclamation marks within single quotes, and nukes whitespace.
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* This function returns a pointer to a buffer that is overwritten by
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* each call.
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*/
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const char *normalize(const char *arg)
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{
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static char *BUFFER=NULL;
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const char *argptr=arg;
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char *bufptr;
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if (BUFFER != NULL)
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free(BUFFER);
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if (!quote) { /* Just copy arg */
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BUFFER=xmalloc(strlen(arg)+1);
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strcpy(BUFFER,arg);
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return BUFFER;
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}
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/* Each character in arg may take upto four characters in the result:
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For a quote we need a closing quote, a backslash, a quote and an
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opening quote! We need also the global opening and closing quote,
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and one extra character for '\0'. */
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BUFFER=xmalloc(strlen(arg)*4+3);
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bufptr=BUFFER;
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*bufptr++='\'';
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while (*argptr) {
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if (*argptr == '\'') {
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/* Quote: replace it with: '\'' */
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*bufptr++='\'';
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*bufptr++='\\';
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*bufptr++='\'';
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*bufptr++='\'';
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} else if (shell==TCSH && *argptr=='!') {
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/* Exclamation mark: replace it with: \! */
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*bufptr++='\'';
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*bufptr++='\\';
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*bufptr++='!';
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*bufptr++='\'';
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} else if (shell==TCSH && *argptr=='\n') {
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/* Newline: replace it with: \n */
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*bufptr++='\\';
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*bufptr++='n';
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} else if (shell==TCSH && isspace(*argptr)) {
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/* Non-newline whitespace: replace it with \<ws> */
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*bufptr++='\'';
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*bufptr++='\\';
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*bufptr++=*argptr;
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*bufptr++='\'';
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} else
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/* Just copy */
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*bufptr++=*argptr;
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argptr++;
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}
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*bufptr++='\'';
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*bufptr++='\0';
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return BUFFER;
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}
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/*
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* Generate the output. argv[0] is the program name (used for reporting errors).
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* argv[1..] contains the options to be parsed. argc must be the number of
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* elements in argv (ie. 1 if there are no options, only the program name),
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* optstr must contain the short options, and longopts the long options.
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* Other settings are found in global variables.
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*/
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int generate_output(char * argv[],int argc,const char *optstr,
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const struct option *longopts)
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{
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int exit_code = 0; /* We assume everything will be OK */
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int opt;
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int longindex;
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const char *charptr;
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if (quiet_errors) /* No error reporting from getopt(3) */
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opterr=0;
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optind=0; /* Reset getopt(3) */
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while ((opt = (alternative?
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getopt_long_only(argc,argv,optstr,longopts,&longindex):
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getopt_long(argc,argv,optstr,longopts,&longindex)))
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!= EOF)
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if (opt == '?' || opt == ':' )
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exit_code = 1;
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else if (!quiet_output) {
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if (opt == LONG_OPT) {
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printf(" --%s",longopts[longindex].name);
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if (longopts[longindex].has_arg)
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printf(" %s",
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normalize(optarg?optarg:""));
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} else if (opt == NON_OPT)
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printf(" %s",normalize(optarg));
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else {
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printf(" -%c",opt);
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charptr = strchr(optstr,opt);
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if (charptr != NULL && *++charptr == ':')
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printf(" %s",
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normalize(optarg?optarg:""));
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}
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}
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if (! quiet_output) {
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printf(" --");
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while (optind < argc)
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printf(" %s",normalize(argv[optind++]));
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printf("\n");
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}
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return exit_code;
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}
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static struct option *long_options=NULL;
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static int long_options_length=0; /* Length of array */
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static int long_options_nr=0; /* Nr of used elements in array */
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static const int LONG_OPTIONS_INCR = 10;
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#define init_longopt() add_longopt(NULL,0)
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/* Register a long option. The contents of name is copied. */
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void add_longopt(const char *name,int has_arg)
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{
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char *tmp;
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if (!name) { /* init */
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free(long_options);
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long_options=NULL;
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long_options_length=0;
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long_options_nr=0;
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}
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if (long_options_nr == long_options_length) {
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long_options_length += LONG_OPTIONS_INCR;
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long_options=xrealloc(long_options,
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sizeof(struct option) *
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long_options_length);
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}
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long_options[long_options_nr].name=NULL;
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long_options[long_options_nr].has_arg=0;
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long_options[long_options_nr].flag=NULL;
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long_options[long_options_nr].val=0;
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if (long_options_nr) { /* Not for init! */
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long_options[long_options_nr-1].has_arg=has_arg;
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long_options[long_options_nr-1].flag=NULL;
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long_options[long_options_nr-1].val=LONG_OPT;
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tmp = xmalloc(strlen(name)+1);
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strcpy(tmp,name);
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long_options[long_options_nr-1].name=tmp;
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}
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long_options_nr++;
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}
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/*
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* Register several long options. options is a string of long options,
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* separated by commas or whitespace.
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* This nukes options!
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*/
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void add_long_options(char *options)
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{
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int arg_opt;
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char *tokptr=strtok(options,", \t\n");
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while (tokptr) {
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arg_opt=no_argument;
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if (strlen(tokptr) > 0) {
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if (tokptr[strlen(tokptr)-1] == ':') {
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if (tokptr[strlen(tokptr)-2] == ':') {
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tokptr[strlen(tokptr)-2]='\0';
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arg_opt=optional_argument;
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} else {
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tokptr[strlen(tokptr)-1]='\0';
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arg_opt=required_argument;
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}
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if (strlen(tokptr) == 0)
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error_msg("empty long option after -l or --long argument");
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}
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add_longopt(tokptr,arg_opt);
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}
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tokptr=strtok(NULL,", \t\n");
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}
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}
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void set_shell(const char *new_shell)
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{
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if (!strcmp(new_shell,"bash"))
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shell=BASH;
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else if (!strcmp(new_shell,"tcsh"))
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shell=TCSH;
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else if (!strcmp(new_shell,"sh"))
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shell=BASH;
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else if (!strcmp(new_shell,"csh"))
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shell=TCSH;
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else
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error_msg("unknown shell after -s or --shell argument");
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}
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/* Exit codes:
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* 0) No errors, succesful operation.
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* 1) getopt(3) returned an error.
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* 2) A problem with parameter parsing for getopt(1).
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* 3) Internal error, out of memory
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* 4) Returned for -T
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*/
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static struct option longopts[]=
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{
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{"options",required_argument,NULL,'o'},
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{"longoptions",required_argument,NULL,'l'},
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{"quiet",no_argument,NULL,'q'},
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{"quiet-output",no_argument,NULL,'Q'},
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{"shell",required_argument,NULL,'s'},
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{"test",no_argument,NULL,'T'},
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{"unquoted",no_argument,NULL,'u'},
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{"alternative",no_argument,NULL,'a'},
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{"name",required_argument,NULL,'n'},
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{NULL,0,NULL,0}
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};
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/* Stop scanning as soon as a non-option argument is found! */
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static const char *shortopts="+ao:l:n:qQs:Tu";
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int getopt_main(int argc, char *argv[])
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{
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char *optstr=NULL;
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char *name=NULL;
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int opt;
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int compatible=0;
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init_longopt();
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if (getenv("GETOPT_COMPATIBLE"))
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compatible=1;
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if (argc == 1) {
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if (compatible) {
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/* For some reason, the original getopt gave no error
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when there were no arguments. */
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printf(" --\n");
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exit(0);
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} else
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error_msg_and_die("missing optstring argument");
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}
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if (argv[1][0] != '-' || compatible) {
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quote=0;
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optstr=xmalloc(strlen(argv[1])+1);
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strcpy(optstr,argv[1]+strspn(argv[1],"-+"));
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argv[1]=argv[0];
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exit(generate_output(argv+1,argc-1,optstr,long_options));
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}
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while ((opt=getopt_long(argc,argv,shortopts,longopts,NULL)) != EOF)
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switch (opt) {
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case 'a':
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alternative=1;
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break;
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case 'o':
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if (optstr)
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free(optstr);
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optstr=xmalloc(strlen(optarg)+1);
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strcpy(optstr,optarg);
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break;
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case 'l':
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add_long_options(optarg);
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break;
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case 'n':
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if (name)
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free(name);
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name=xmalloc(strlen(optarg)+1);
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strcpy(name,optarg);
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break;
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case 'q':
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quiet_errors=1;
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break;
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case 'Q':
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quiet_output=1;
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break;
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case 's':
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set_shell(optarg);
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break;
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case 'T':
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exit(4);
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case 'u':
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quote=0;
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break;
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default:
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show_usage();
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}
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if (!optstr) {
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if (optind >= argc)
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error_msg_and_die("missing optstring argument");
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else {
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optstr=xmalloc(strlen(argv[optind])+1);
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strcpy(optstr,argv[optind]);
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optind++;
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}
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}
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if (name)
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argv[optind-1]=name;
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else
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argv[optind-1]=argv[0];
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exit(generate_output(argv+optind-1,argc-optind+1,optstr,long_options));
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}
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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