c06f568dda
While building glibc with busybox as part of the development environment, I found a bug in glibc's regexec can throw sed into an endless loop. This fixes it. Should I put an #ifdef around it or something? (Note, this patch also contains the "this is not gnu sed 4.0" hack I posted earlier, which is also needed to build glibc...)
1160 lines
30 KiB
C
1160 lines
30 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* sed.c - very minimalist version of sed
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*
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* Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
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* Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
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* Copyright (C) 2002 Matt Kraai
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* Copyright (C) 2003 by Glenn McGrath <bug1@optushome.com.au>
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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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*/
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/* Code overview.
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Files are laid out to avoid unnecessary function declarations. So for
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example, every function add_cmd calls occurs before add_cmd in this file.
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add_cmd() is called on each line of sed command text (from a file or from
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the command line). It calls get_address() and parse_cmd_args(). The
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resulting sed_cmd_t structures are appended to a linked list
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(sed_cmd_head/sed_cmd_tail).
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process_file() does actual sedding, reading data lines from an input FILE *
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(which could be stdin) and applying the sed command list (sed_cmd_head) to
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each of the resulting lines.
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sed_main() is where external code calls into this, with a command line.
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*/
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/*
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Supported features and commands in this version of sed:
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- comments ('#')
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- address matching: num|/matchstr/[,num|/matchstr/|$]command
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- commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
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- edit commands: (a)ppend, (i)nsert, (c)hange
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- file commands: (r)ead
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- backreferences in substitution expressions (\1, \2...\9)
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- grouped commands: {cmd1;cmd2}
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- transliteration (y/source-chars/dest-chars/)
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- pattern space hold space storing / swapping (g, h, x)
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- labels / branching (: label, b, t)
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(Note: Specifying an address (range) to match is *optional*; commands
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default to the whole pattern space if no specific address match was
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requested.)
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Unsupported features:
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- GNU extensions
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- and more.
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Todo:
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- Create a wrapper around regex to make libc's regex conform with sed
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- Fix bugs
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Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
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*/
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#include <stdio.h>
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#include <unistd.h> /* for getopt() */
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#include <regex.h>
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#include <string.h> /* for strdup() */
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#include <errno.h>
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#include <ctype.h> /* for isspace() */
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#include <stdlib.h>
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#include "busybox.h"
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typedef struct sed_cmd_s {
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/* Ordered by alignment requirements: currently 36 bytes on x86 */
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/* address storage */
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regex_t *beg_match; /* sed -e '/match/cmd' */
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regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
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regex_t *sub_match; /* For 's/sub_match/string/' */
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int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
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int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
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FILE *file; /* File (sr) command writes to, -1 for none. */
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char *string; /* Data string for (saicytb) commands. */
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unsigned short which_match; /* (s) Which match to replace (0 for all) */
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/* Bitfields (gcc won't group them if we don't) */
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unsigned int invert:1; /* the '!' after the address */
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unsigned int in_match:1; /* Next line also included in match? */
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unsigned int no_newline:1; /* Last line written by (sr) had no '\n' */
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unsigned int sub_p:1; /* (s) print option */
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/* GENERAL FIELDS */
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char cmd; /* The command char: abcdDgGhHilnNpPqrstwxy:={} */
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struct sed_cmd_s *next; /* Next command (linked list, NULL terminated) */
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} sed_cmd_t;
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/* globals */
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/* options */
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static int be_quiet = 0;
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static const char bad_format_in_subst[] =
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"bad format in substitution expression";
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const char *const semicolon_whitespace = "; \n\r\t\v";
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regmatch_t regmatch[10];
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static regex_t *previous_regex_ptr = NULL;
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/* linked list of sed commands */
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static sed_cmd_t sed_cmd_head;
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static sed_cmd_t *sed_cmd_tail = &sed_cmd_head;
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/* Linked list of append lines */
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struct append_list {
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char *string;
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struct append_list *next;
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};
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struct append_list *append_head=NULL, *append_tail=NULL;
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#ifdef CONFIG_FEATURE_CLEAN_UP
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static void free_and_close_stuff(void)
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{
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sed_cmd_t *sed_cmd = sed_cmd_head.next;
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while(append_head) {
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append_tail=append_head->next;
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free(append_head->string);
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free(append_head);
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append_head=append_tail;
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}
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while (sed_cmd) {
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sed_cmd_t *sed_cmd_next = sed_cmd->next;
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if(sed_cmd->file)
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bb_xprint_and_close_file(sed_cmd->file);
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if (sed_cmd->beg_match) {
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regfree(sed_cmd->beg_match);
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free(sed_cmd->beg_match);
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}
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if (sed_cmd->end_match) {
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regfree(sed_cmd->end_match);
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free(sed_cmd->end_match);
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}
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if (sed_cmd->sub_match) {
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regfree(sed_cmd->sub_match);
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free(sed_cmd->sub_match);
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}
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free(sed_cmd->string);
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free(sed_cmd);
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sed_cmd = sed_cmd_next;
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}
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}
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#endif
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/* strdup, replacing "\n" with '\n', and "\delimiter" with 'delimiter' */
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static void parse_escapes(char *dest, const char *string, int len, char from, char to)
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{
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int i=0;
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while(i<len) {
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if(string[i] == '\\') {
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if(!to || string[i+1] == from) {
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*(dest++) = to ? to : string[i+1];
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i+=2;
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continue;
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} else *(dest++)=string[i++];
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}
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*(dest++) = string[i++];
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}
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*dest=0;
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}
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static char *copy_parsing_slashn(const char *string, int len)
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{
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char *dest=xmalloc(len+1);
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parse_escapes(dest,string,len,'n','\n');
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return dest;
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}
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/*
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* index_of_next_unescaped_regexp_delim - walks left to right through a string
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* beginning at a specified index and returns the index of the next regular
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* expression delimiter (typically a forward * slash ('/')) not preceeded by
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* a backslash ('\').
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*/
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static int index_of_next_unescaped_regexp_delim(const char delimiter,
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const char *str)
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{
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int bracket = -1;
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int escaped = 0;
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int idx = 0;
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char ch;
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for (; (ch = str[idx]); idx++) {
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if (bracket != -1) {
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if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
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&& str[idx - 1] == '^')))
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bracket = -1;
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} else if (escaped)
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escaped = 0;
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else if (ch == '\\')
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escaped = 1;
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else if (ch == '[')
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bracket = idx;
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else if (ch == delimiter)
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return idx;
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}
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/* if we make it to here, we've hit the end of the string */
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return -1;
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}
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/*
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* Returns the index of the third delimiter
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*/
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static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
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{
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const char *cmdstr_ptr = cmdstr;
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char delimiter;
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int idx = 0;
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/* verify that the 's' or 'y' is followed by something. That something
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* (typically a 'slash') is now our regexp delimiter... */
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if (*cmdstr == '\0') bb_error_msg_and_die(bad_format_in_subst);
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delimiter = *(cmdstr_ptr++);
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/* save the match string */
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idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
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if (idx == -1) {
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bb_error_msg_and_die(bad_format_in_subst);
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}
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*match = copy_parsing_slashn(cmdstr_ptr, idx);
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/* save the replacement string */
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cmdstr_ptr += idx + 1;
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idx = index_of_next_unescaped_regexp_delim(delimiter, cmdstr_ptr);
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if (idx == -1) {
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bb_error_msg_and_die(bad_format_in_subst);
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}
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*replace = copy_parsing_slashn(cmdstr_ptr, idx);
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return ((cmdstr_ptr - cmdstr) + idx);
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}
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/*
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* returns the index in the string just past where the address ends.
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*/
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static int get_address(char *my_str, int *linenum, regex_t ** regex)
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{
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char *pos = my_str;
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if (isdigit(*my_str)) {
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*linenum = strtol(my_str, &pos, 10);
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/* endstr shouldnt ever equal NULL */
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} else if (*my_str == '$') {
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*linenum = -1;
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pos++;
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} else if (*my_str == '/' || *my_str == '\\') {
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int next;
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char delimiter;
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char *temp;
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if (*my_str == '\\') delimiter = *(++pos);
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else delimiter = '/';
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next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
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if (next == -1)
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bb_error_msg_and_die("unterminated match expression");
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temp=copy_parsing_slashn(pos,next);
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*regex = (regex_t *) xmalloc(sizeof(regex_t));
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xregcomp(*regex, temp, REG_NEWLINE);
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free(temp);
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/* Move position to next character after last delimiter */
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pos+=(next+1);
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}
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return pos - my_str;
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}
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/* Grab a filename. Whitespace at start is skipped, then goes to EOL. */
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static int parse_file_cmd(sed_cmd_t * sed_cmd, const char *filecmdstr, char **retval)
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{
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int start = 0, idx, hack=0;
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/* Skip whitespace, then grab filename to end of line */
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while (isspace(filecmdstr[start])) start++;
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idx=start;
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while(filecmdstr[idx] && filecmdstr[idx]!='\n') idx++;
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/* If lines glued together, put backslash back. */
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if(filecmdstr[idx]=='\n') hack=1;
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if(idx==start) bb_error_msg_and_die("Empty filename");
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*retval = bb_xstrndup(filecmdstr+start, idx-start+hack+1);
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if(hack) *(idx+*retval)='\\';
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return idx;
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}
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static int parse_subst_cmd(sed_cmd_t * const sed_cmd, char *substr)
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{
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int cflags = 0;
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char *match;
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int idx = 0;
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/*
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* A substitution command should look something like this:
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* s/match/replace/ #gIpw
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* || | |||
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* mandatory optional
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*/
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idx = parse_regex_delim(substr, &match, &sed_cmd->string);
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/* determine the number of back references in the match string */
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/* Note: we compute this here rather than in the do_subst_command()
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* function to save processor time, at the expense of a little more memory
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* (4 bits) per sed_cmd */
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/* process the flags */
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sed_cmd->which_match=1;
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while (substr[++idx]) {
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/* Parse match number */
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if(isdigit(substr[idx])) {
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if(match[0]!='^') {
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/* Match 0 treated as all, multiple matches we take the last one. */
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char *pos=substr+idx;
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sed_cmd->which_match=(unsigned short)strtol(substr+idx,&pos,10);
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idx=pos-substr;
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}
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continue;
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}
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/* Skip spaces */
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if(isspace(substr[idx])) continue;
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switch (substr[idx]) {
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/* Replace all occurrences */
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case 'g':
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if (match[0] != '^') sed_cmd->which_match = 0;
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break;
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/* Print pattern space */
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case 'p':
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sed_cmd->sub_p = 1;
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break;
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case 'w':
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{
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char *temp;
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idx+=parse_file_cmd(sed_cmd,substr+idx,&temp);
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break;
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}
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/* Ignore case (gnu exension) */
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case 'I':
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cflags |= REG_ICASE;
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break;
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case ';':
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case '}':
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goto out;
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default:
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bb_error_msg_and_die("bad option in substitution expression");
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}
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}
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out:
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/* compile the match string into a regex */
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if (*match != '\0') {
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/* If match is empty, we use last regex used at runtime */
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sed_cmd->sub_match = (regex_t *) xmalloc(sizeof(regex_t));
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xregcomp(sed_cmd->sub_match, match, cflags);
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}
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free(match);
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return idx;
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}
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/*
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* Process the commands arguments
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*/
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static char *parse_cmd_args(sed_cmd_t *sed_cmd, char *cmdstr)
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{
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/* handle (s)ubstitution command */
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if (sed_cmd->cmd == 's') cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
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/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
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else if (strchr("aic", sed_cmd->cmd)) {
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if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
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bb_error_msg_and_die
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("only a beginning address can be specified for edit commands");
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while(isspace(*cmdstr)) cmdstr++;
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sed_cmd->string = bb_xstrdup(cmdstr);
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parse_escapes(sed_cmd->string,sed_cmd->string,strlen(cmdstr),0,0);
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cmdstr += strlen(cmdstr);
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/* handle file cmds: (r)ead */
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} else if(strchr("rw", sed_cmd->cmd)) {
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if (sed_cmd->end_line || sed_cmd->end_match)
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bb_error_msg_and_die("Command only uses one address");
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cmdstr += parse_file_cmd(sed_cmd, cmdstr, &sed_cmd->string);
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if(sed_cmd->cmd=='w')
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sed_cmd->file=bb_xfopen(sed_cmd->string,"w");
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/* handle branch commands */
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} else if (strchr(":bt", sed_cmd->cmd)) {
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int length;
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while(isspace(*cmdstr)) cmdstr++;
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length = strcspn(cmdstr, semicolon_whitespace);
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if (length) {
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sed_cmd->string = strndup(cmdstr, length);
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cmdstr += length;
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}
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}
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/* translation command */
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else if (sed_cmd->cmd == 'y') {
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char *match, *replace;
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int i=cmdstr[0];
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cmdstr+=parse_regex_delim(cmdstr, &match, &replace)+1;
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/* \n already parsed, but \delimiter needs unescaping. */
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parse_escapes(match,match,strlen(match),i,i);
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parse_escapes(replace,replace,strlen(replace),i,i);
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sed_cmd->string = xcalloc(1, (strlen(match) + 1) * 2);
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for (i = 0; match[i] && replace[i]; i++) {
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sed_cmd->string[i * 2] = match[i];
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sed_cmd->string[(i * 2) + 1] = replace[i];
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}
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free(match);
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free(replace);
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}
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/* if it wasnt a single-letter command that takes no arguments
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* then it must be an invalid command.
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*/
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else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
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bb_error_msg_and_die("Unsupported command %c", sed_cmd->cmd);
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}
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/* give back whatever's left over */
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return (cmdstr);
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}
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/* Parse address+command sets, skipping comment lines. */
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void add_cmd(char *cmdstr)
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{
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static char *add_cmd_line=NULL;
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sed_cmd_t *sed_cmd;
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int temp;
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/* Append this line to any unfinished line from last time. */
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if(add_cmd_line) {
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int lastlen=strlen(add_cmd_line);
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char *tmp=xmalloc(lastlen+strlen(cmdstr)+2);
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memcpy(tmp,add_cmd_line,lastlen);
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tmp[lastlen]='\n';
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strcpy(tmp+lastlen+1,cmdstr);
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free(add_cmd_line);
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cmdstr=add_cmd_line=tmp;
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} else add_cmd_line=NULL;
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/* If this line ends with backslash, request next line. */
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temp=strlen(cmdstr);
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if(temp && cmdstr[temp-1]=='\\') {
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if(!add_cmd_line) add_cmd_line=strdup(cmdstr);
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add_cmd_line[temp-1]=0;
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return;
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}
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/* Loop parsing all commands in this line. */
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while(*cmdstr) {
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/* Skip leading whitespace and semicolons */
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cmdstr += strspn(cmdstr, semicolon_whitespace);
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/* If no more commands, exit. */
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if(!*cmdstr) break;
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/* if this is a comment, jump past it and keep going */
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if (*cmdstr == '#') {
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/* "#n" is the same as using -n on the command line */
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if (cmdstr[1] == 'n') be_quiet++;
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if(!(cmdstr=strpbrk(cmdstr, "\n\r"))) break;
|
|
continue;
|
|
}
|
|
|
|
/* parse the command
|
|
* format is: [addr][,addr][!]cmd
|
|
* |----||-----||-|
|
|
* part1 part2 part3
|
|
*/
|
|
|
|
sed_cmd = xcalloc(1, sizeof(sed_cmd_t));
|
|
|
|
/* first part (if present) is an address: either a '$', a number or a /regex/ */
|
|
cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
|
|
|
|
/* second part (if present) will begin with a comma */
|
|
if (*cmdstr == ',') {
|
|
int idx;
|
|
|
|
cmdstr++;
|
|
idx = get_address(cmdstr, &sed_cmd->end_line, &sed_cmd->end_match);
|
|
if (!idx) bb_error_msg_and_die("get_address: no address found in string\n");
|
|
cmdstr += idx;
|
|
}
|
|
|
|
/* skip whitespace before the command */
|
|
while (isspace(*cmdstr)) cmdstr++;
|
|
|
|
/* Check for inversion flag */
|
|
if (*cmdstr == '!') {
|
|
sed_cmd->invert = 1;
|
|
cmdstr++;
|
|
|
|
/* skip whitespace before the command */
|
|
while (isspace(*cmdstr)) cmdstr++;
|
|
}
|
|
|
|
/* last part (mandatory) will be a command */
|
|
if (!*cmdstr) bb_error_msg_and_die("missing command");
|
|
sed_cmd->cmd = *(cmdstr++);
|
|
cmdstr = parse_cmd_args(sed_cmd, cmdstr);
|
|
|
|
/* Add the command to the command array */
|
|
sed_cmd_tail->next = sed_cmd;
|
|
sed_cmd_tail = sed_cmd_tail->next;
|
|
}
|
|
|
|
/* If we glued multiple lines together, free the memory. */
|
|
if(add_cmd_line) {
|
|
free(add_cmd_line);
|
|
add_cmd_line=NULL;
|
|
}
|
|
}
|
|
|
|
struct pipeline {
|
|
char *buf; /* Space to hold string */
|
|
int idx; /* Space used */
|
|
int len; /* Space allocated */
|
|
} pipeline;
|
|
|
|
#define PIPE_GROW 64
|
|
|
|
void pipe_putc(char c)
|
|
{
|
|
if(pipeline.idx==pipeline.len) {
|
|
pipeline.buf = xrealloc(pipeline.buf, pipeline.len + PIPE_GROW);
|
|
pipeline.len+=PIPE_GROW;
|
|
}
|
|
pipeline.buf[pipeline.idx++] = (c);
|
|
}
|
|
|
|
static void do_subst_w_backrefs(const char *line, const char *replace)
|
|
{
|
|
int i,j;
|
|
|
|
/* go through the replacement string */
|
|
for (i = 0; replace[i]; i++) {
|
|
/* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
|
|
if (replace[i] == '\\' && replace[i+1]>'0' && replace[i+1]<='9') {
|
|
int backref=replace[++i]-'0';
|
|
|
|
/* print out the text held in regmatch[backref] */
|
|
if(regmatch[backref].rm_so != -1)
|
|
for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
|
|
pipe_putc(line[j]);
|
|
}
|
|
|
|
/* if we find a backslash escaped character, print the character */
|
|
else if (replace[i] == '\\') pipe_putc(replace[++i]);
|
|
|
|
/* if we find an unescaped '&' print out the whole matched text. */
|
|
else if (replace[i] == '&')
|
|
for (j = regmatch[0].rm_so; j < regmatch[0].rm_eo; j++)
|
|
pipe_putc(line[j]);
|
|
/* Otherwise just output the character. */
|
|
else pipe_putc(replace[i]);
|
|
}
|
|
}
|
|
|
|
static int do_subst_command(sed_cmd_t * sed_cmd, char **line)
|
|
{
|
|
char *oldline = *line;
|
|
int altered = 0;
|
|
int match_count=0;
|
|
regex_t *current_regex;
|
|
|
|
/* Handle empty regex. */
|
|
if (sed_cmd->sub_match == NULL) {
|
|
current_regex = previous_regex_ptr;
|
|
if(!current_regex)
|
|
bb_error_msg_and_die("No previous regexp.");
|
|
} else previous_regex_ptr = current_regex = sed_cmd->sub_match;
|
|
|
|
/* Find the first match */
|
|
if(REG_NOMATCH==regexec(current_regex, oldline, 10, regmatch, 0))
|
|
return 0;
|
|
|
|
/* Initialize temporary output buffer. */
|
|
pipeline.buf=xmalloc(PIPE_GROW);
|
|
pipeline.len=PIPE_GROW;
|
|
pipeline.idx=0;
|
|
|
|
/* Now loop through, substituting for matches */
|
|
do {
|
|
int i;
|
|
|
|
/* Work around bug in glibc regexec, demonstrated by:
|
|
echo " a.b" | busybox sed 's [^ .]* x g'
|
|
The match_count check is so not to break
|
|
echo "hi" | busybox sed 's/^/!/g' */
|
|
if(!regmatch[0].rm_so && !regmatch[0].rm_eo && match_count) {
|
|
pipe_putc(*(oldline++));
|
|
continue;
|
|
}
|
|
|
|
match_count++;
|
|
|
|
/* If we aren't interested in this match, output old line to
|
|
end of match and continue */
|
|
if(sed_cmd->which_match && sed_cmd->which_match!=match_count) {
|
|
for(i=0;i<regmatch[0].rm_eo;i++)
|
|
pipe_putc(oldline[i]);
|
|
continue;
|
|
}
|
|
|
|
/* print everything before the match */
|
|
for (i = 0; i < regmatch[0].rm_so; i++) pipe_putc(oldline[i]);
|
|
|
|
/* then print the substitution string */
|
|
do_subst_w_backrefs(oldline, sed_cmd->string);
|
|
|
|
/* advance past the match */
|
|
oldline += regmatch[0].rm_eo;
|
|
/* flag that something has changed */
|
|
altered++;
|
|
|
|
/* if we're not doing this globally, get out now */
|
|
if (sed_cmd->which_match) break;
|
|
} while (*oldline && (regexec(current_regex, oldline, 10, regmatch, 0) != REG_NOMATCH));
|
|
|
|
/* Copy rest of string into output pipeline */
|
|
|
|
while(*oldline) pipe_putc(*(oldline++));
|
|
pipe_putc(0);
|
|
|
|
free(*line);
|
|
*line = pipeline.buf;
|
|
return altered;
|
|
}
|
|
|
|
/* Set command pointer to point to this label. (Does not handle null label.) */
|
|
static sed_cmd_t *branch_to(const char *label)
|
|
{
|
|
sed_cmd_t *sed_cmd;
|
|
|
|
for (sed_cmd = sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
|
|
if ((sed_cmd->cmd == ':') && (sed_cmd->string) && (strcmp(sed_cmd->string, label) == 0)) {
|
|
return (sed_cmd);
|
|
}
|
|
}
|
|
bb_error_msg_and_die("Can't find label for jump to `%s'", label);
|
|
}
|
|
|
|
/* Append copy of string to append buffer */
|
|
static void append(char *s)
|
|
{
|
|
struct append_list *temp=calloc(1,sizeof(struct append_list));
|
|
|
|
if(append_head)
|
|
append_tail=(append_tail->next=temp);
|
|
else append_head=append_tail=temp;
|
|
temp->string=strdup(s);
|
|
}
|
|
|
|
static void flush_append(void)
|
|
{
|
|
/* Output appended lines. */
|
|
while(append_head) {
|
|
puts(append_head->string);
|
|
append_tail=append_head->next;
|
|
free(append_head->string);
|
|
free(append_head);
|
|
append_head=append_tail;
|
|
}
|
|
append_head=append_tail=NULL;
|
|
}
|
|
|
|
/* Get next line of input, flushing append buffer and noting if we hit EOF
|
|
* without a newline on the last line.
|
|
*/
|
|
static char *get_next_line(FILE * file, int *no_newline)
|
|
{
|
|
char *temp;
|
|
int len;
|
|
|
|
flush_append();
|
|
temp=bb_get_line_from_file(file);
|
|
if(temp) {
|
|
len=strlen(temp);
|
|
if(len && temp[len-1]=='\n') temp[len-1]=0;
|
|
else *no_newline=1;
|
|
}
|
|
|
|
return temp;
|
|
}
|
|
|
|
/* Output line of text. missing_newline means the last line output did not
|
|
end with a newline. no_newline means this line does not end with a
|
|
newline. */
|
|
|
|
static int puts_maybe_newline(char *s, FILE *file, int missing_newline, int no_newline)
|
|
{
|
|
if(missing_newline) fputc('\n',file);
|
|
fputs(s,file);
|
|
if(!no_newline) fputc('\n',file);
|
|
|
|
return no_newline;
|
|
}
|
|
|
|
#define sed_puts(s,n) missing_newline=puts_maybe_newline(s,stdout,missing_newline,n)
|
|
|
|
static void process_file(FILE * file)
|
|
{
|
|
char *pattern_space, *next_line, *hold_space=NULL;
|
|
static int linenum = 0, missing_newline=0;
|
|
int no_newline,next_no_newline=0;
|
|
|
|
next_line = get_next_line(file,&next_no_newline);
|
|
|
|
/* go through every line in the file */
|
|
for(;;) {
|
|
sed_cmd_t *sed_cmd;
|
|
int substituted=0;
|
|
|
|
/* Advance to next line. Stop if out of lines. */
|
|
if(!(pattern_space=next_line)) break;
|
|
no_newline=next_no_newline;
|
|
|
|
/* Read one line in advance so we can act on the last line, the '$' address */
|
|
next_line = get_next_line(file,&next_no_newline);
|
|
linenum++;
|
|
restart:
|
|
/* for every line, go through all the commands */
|
|
for (sed_cmd = sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
|
|
int old_matched, matched;
|
|
|
|
old_matched = sed_cmd->in_match;
|
|
|
|
/* Determine if this command matches this line: */
|
|
|
|
/* Are we continuing a previous multi-line match? */
|
|
|
|
sed_cmd->in_match = sed_cmd->in_match
|
|
|
|
/* Or is no range necessary? */
|
|
|| (!sed_cmd->beg_line && !sed_cmd->end_line
|
|
&& !sed_cmd->beg_match && !sed_cmd->end_match)
|
|
|
|
/* Or did we match the start of a numerical range? */
|
|
|| (sed_cmd->beg_line > 0 && (sed_cmd->beg_line == linenum))
|
|
|
|
/* Or does this line match our begin address regex? */
|
|
|| (sed_cmd->beg_match &&
|
|
!regexec(sed_cmd->beg_match, pattern_space, 0, NULL, 0))
|
|
|
|
/* Or did we match last line of input? */
|
|
|| (sed_cmd->beg_line == -1 && next_line == NULL);
|
|
|
|
/* Snapshot the value */
|
|
|
|
matched = sed_cmd->in_match;
|
|
|
|
/* Is this line the end of the current match? */
|
|
|
|
if(matched) {
|
|
sed_cmd->in_match = !(
|
|
/* has the ending line come, or is this a single address command? */
|
|
(sed_cmd->end_line ?
|
|
sed_cmd->end_line==-1 ?
|
|
!next_line
|
|
: sed_cmd->end_line<=linenum
|
|
: !sed_cmd->end_match)
|
|
/* or does this line matches our last address regex */
|
|
|| (sed_cmd->end_match && old_matched && (regexec(sed_cmd->end_match, pattern_space, 0, NULL, 0) == 0))
|
|
);
|
|
}
|
|
|
|
/* Skip blocks of commands we didn't match. */
|
|
if (sed_cmd->cmd == '{') {
|
|
if(sed_cmd->invert ? matched : !matched)
|
|
while(sed_cmd && sed_cmd->cmd!='}') sed_cmd=sed_cmd->next;
|
|
if(!sed_cmd) bb_error_msg_and_die("Unterminated {");
|
|
continue;
|
|
}
|
|
|
|
/* Okay, so did this line match? */
|
|
if (sed_cmd->invert ? !matched : matched) {
|
|
/* Update last used regex in case a blank substitute BRE is found */
|
|
if (sed_cmd->beg_match) {
|
|
previous_regex_ptr = sed_cmd->beg_match;
|
|
}
|
|
|
|
/* actual sedding */
|
|
switch (sed_cmd->cmd) {
|
|
|
|
/* Print line number */
|
|
case '=':
|
|
printf("%d\n", linenum);
|
|
break;
|
|
|
|
/* Write the current pattern space up to the first newline */
|
|
case 'P':
|
|
{
|
|
char *tmp = strchr(pattern_space, '\n');
|
|
|
|
if (tmp) {
|
|
*tmp = '\0';
|
|
sed_puts(pattern_space,1);
|
|
*tmp = '\n';
|
|
break;
|
|
}
|
|
/* Fall Through */
|
|
}
|
|
|
|
/* Write the current pattern space to output */
|
|
case 'p':
|
|
sed_puts(pattern_space,no_newline);
|
|
break;
|
|
/* Delete up through first newline */
|
|
case 'D':
|
|
{
|
|
char *tmp = strchr(pattern_space,'\n');
|
|
|
|
if(tmp) {
|
|
tmp=bb_xstrdup(tmp+1);
|
|
free(pattern_space);
|
|
pattern_space=tmp;
|
|
goto restart;
|
|
}
|
|
}
|
|
/* discard this line. */
|
|
case 'd':
|
|
goto discard_line;
|
|
|
|
/* Substitute with regex */
|
|
case 's':
|
|
if(do_subst_command(sed_cmd, &pattern_space)) {
|
|
substituted|=1;
|
|
|
|
/* handle p option */
|
|
if(sed_cmd->sub_p)
|
|
sed_puts(pattern_space,no_newline);
|
|
/* handle w option */
|
|
if(sed_cmd->file)
|
|
sed_cmd->no_newline=puts_maybe_newline(pattern_space, sed_cmd->file, sed_cmd->no_newline, no_newline);
|
|
|
|
}
|
|
break;
|
|
|
|
/* Append line to linked list to be printed later */
|
|
case 'a':
|
|
{
|
|
append(sed_cmd->string);
|
|
break;
|
|
}
|
|
|
|
/* Insert text before this line */
|
|
case 'i':
|
|
sed_puts(sed_cmd->string,1);
|
|
break;
|
|
|
|
/* Cut and paste text (replace) */
|
|
case 'c':
|
|
/* Only triggers on last line of a matching range. */
|
|
if (!sed_cmd->in_match) sed_puts(sed_cmd->string,1);
|
|
goto discard_line;
|
|
|
|
/* Read file, append contents to output */
|
|
case 'r':
|
|
{
|
|
FILE *outfile;
|
|
|
|
outfile = fopen(sed_cmd->string, "r");
|
|
if (outfile) {
|
|
char *line;
|
|
|
|
while ((line = bb_get_chomped_line_from_file(outfile))
|
|
!= NULL)
|
|
append(line);
|
|
bb_xprint_and_close_file(outfile);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
/* Write pattern space to file. */
|
|
case 'w':
|
|
sed_cmd->no_newline=puts_maybe_newline(pattern_space,sed_cmd->file, sed_cmd->no_newline,no_newline);
|
|
break;
|
|
|
|
/* Read next line from input */
|
|
case 'n':
|
|
if (!be_quiet)
|
|
sed_puts(pattern_space,no_newline);
|
|
if (next_line) {
|
|
free(pattern_space);
|
|
pattern_space = next_line;
|
|
no_newline=next_no_newline;
|
|
next_line = get_next_line(file,&next_no_newline);
|
|
linenum++;
|
|
break;
|
|
}
|
|
/* fall through */
|
|
|
|
/* Quit. End of script, end of input. */
|
|
case 'q':
|
|
/* Exit the outer while loop */
|
|
free(next_line);
|
|
next_line = NULL;
|
|
goto discard_commands;
|
|
|
|
/* Append the next line to the current line */
|
|
case 'N':
|
|
{
|
|
/* If no next line, jump to end of script and exit. */
|
|
if (next_line == NULL) {
|
|
/* Jump to end of script and exit */
|
|
free(next_line);
|
|
next_line = NULL;
|
|
goto discard_line;
|
|
/* append next_line, read new next_line. */
|
|
} else {
|
|
int len=strlen(pattern_space);
|
|
|
|
pattern_space = realloc(pattern_space, len + strlen(next_line) + 2);
|
|
pattern_space[len]='\n';
|
|
strcpy(pattern_space+len+1, next_line);
|
|
no_newline=next_no_newline;
|
|
next_line = get_next_line(file,&next_no_newline);
|
|
linenum++;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Test if substition worked, branch if so. */
|
|
case 't':
|
|
if (!substituted) break;
|
|
substituted=0;
|
|
/* Fall through */
|
|
/* Branch to label */
|
|
case 'b':
|
|
if (!sed_cmd->string) goto discard_commands;
|
|
else sed_cmd = branch_to(sed_cmd->string);
|
|
break;
|
|
/* Transliterate characters */
|
|
case 'y':
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; pattern_space[i]; i++) {
|
|
int j;
|
|
|
|
for (j = 0; sed_cmd->string[j]; j += 2) {
|
|
if (pattern_space[i] == sed_cmd->string[j]) {
|
|
pattern_space[i] = sed_cmd->string[j + 1];
|
|
}
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
case 'g': /* Replace pattern space with hold space */
|
|
free(pattern_space);
|
|
if (hold_space) {
|
|
pattern_space = strdup(hold_space);
|
|
no_newline=0;
|
|
}
|
|
break;
|
|
case 'G': /* Append newline and hold space to pattern space */
|
|
{
|
|
int pattern_space_size = 2;
|
|
int hold_space_size = 0;
|
|
|
|
if (pattern_space)
|
|
pattern_space_size += strlen(pattern_space);
|
|
if (hold_space) hold_space_size = strlen(hold_space);
|
|
pattern_space = xrealloc(pattern_space, pattern_space_size + hold_space_size);
|
|
if (pattern_space_size == 2) pattern_space[0]=0;
|
|
strcat(pattern_space, "\n");
|
|
if (hold_space) strcat(pattern_space, hold_space);
|
|
no_newline=0;
|
|
|
|
break;
|
|
}
|
|
case 'h': /* Replace hold space with pattern space */
|
|
free(hold_space);
|
|
hold_space = strdup(pattern_space);
|
|
break;
|
|
case 'H': /* Append newline and pattern space to hold space */
|
|
{
|
|
int hold_space_size = 2;
|
|
int pattern_space_size = 0;
|
|
|
|
if (hold_space) hold_space_size += strlen(hold_space);
|
|
if (pattern_space)
|
|
pattern_space_size = strlen(pattern_space);
|
|
hold_space = xrealloc(hold_space,
|
|
hold_space_size + pattern_space_size);
|
|
|
|
if (hold_space_size == 2) hold_space[0]=0;
|
|
strcat(hold_space, "\n");
|
|
if (pattern_space) strcat(hold_space, pattern_space);
|
|
|
|
break;
|
|
}
|
|
case 'x': /* Exchange hold and pattern space */
|
|
{
|
|
char *tmp = pattern_space;
|
|
pattern_space = hold_space;
|
|
no_newline=0;
|
|
hold_space = tmp;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* exit point from sedding...
|
|
*/
|
|
discard_commands:
|
|
/* we will print the line unless we were told to be quiet ('-n')
|
|
or if the line was suppressed (ala 'd'elete) */
|
|
if (!be_quiet) sed_puts(pattern_space,no_newline);
|
|
|
|
/* Delete and such jump here. */
|
|
discard_line:
|
|
flush_append();
|
|
free(pattern_space);
|
|
}
|
|
}
|
|
|
|
/* It is possible to have a command line argument with embedded
|
|
newlines. This counts as multiple command lines. */
|
|
|
|
static void add_cmd_block(char *cmdstr)
|
|
{
|
|
int go=1;
|
|
char *temp=bb_xstrdup(cmdstr),*temp2=temp;
|
|
|
|
while(go) {
|
|
int len=strcspn(temp2,"\n");
|
|
if(!temp2[len]) go=0;
|
|
else temp2[len]=0;
|
|
add_cmd(temp2);
|
|
temp2+=len+1;
|
|
}
|
|
free(temp);
|
|
}
|
|
|
|
extern int sed_main(int argc, char **argv)
|
|
{
|
|
int opt, status = EXIT_SUCCESS;
|
|
|
|
#ifdef CONFIG_FEATURE_CLEAN_UP
|
|
/* destroy command strings on exit */
|
|
if (atexit(free_and_close_stuff) == -1)
|
|
bb_perror_msg_and_die("atexit");
|
|
#endif
|
|
|
|
#define LIE_TO_AUTOCONF
|
|
#ifdef LIE_TO_AUTOCONF
|
|
if(argc==2 && !strcmp(argv[1],"--version")) {
|
|
printf("This is not GNU sed version 4.0\n");
|
|
exit(0);
|
|
}
|
|
#endif
|
|
|
|
/* do normal option parsing */
|
|
while ((opt = getopt(argc, argv, "ne:f:")) > 0) {
|
|
switch (opt) {
|
|
case 'n':
|
|
be_quiet++;
|
|
break;
|
|
case 'e':
|
|
add_cmd_block(optarg);
|
|
break;
|
|
case 'f':
|
|
{
|
|
FILE *cmdfile;
|
|
char *line;
|
|
|
|
cmdfile = bb_xfopen(optarg, "r");
|
|
|
|
while ((line = bb_get_chomped_line_from_file(cmdfile))
|
|
!= NULL) {
|
|
add_cmd(line);
|
|
free(line);
|
|
}
|
|
bb_xprint_and_close_file(cmdfile);
|
|
|
|
break;
|
|
}
|
|
default:
|
|
bb_show_usage();
|
|
}
|
|
}
|
|
|
|
/* if we didn't get a pattern from a -e and no command file was specified,
|
|
* argv[optind] should be the pattern. no pattern, no worky */
|
|
if (sed_cmd_head.next == NULL) {
|
|
if (argv[optind] == NULL)
|
|
bb_show_usage();
|
|
else
|
|
add_cmd_block(argv[optind++]);
|
|
}
|
|
/* Flush any unfinished commands. */
|
|
add_cmd("");
|
|
|
|
/* argv[(optind)..(argc-1)] should be names of file to process. If no
|
|
* files were specified or '-' was specified, take input from stdin.
|
|
* Otherwise, we process all the files specified. */
|
|
if (argv[optind] == NULL) {
|
|
process_file(stdin);
|
|
} else {
|
|
int i;
|
|
FILE *file;
|
|
|
|
for (i = optind; i < argc; i++) {
|
|
if(!strcmp(argv[i], "-")) {
|
|
process_file(stdin);
|
|
} else {
|
|
file = bb_wfopen(argv[i], "r");
|
|
if (file) {
|
|
process_file(file);
|
|
fclose(file);
|
|
} else {
|
|
status = EXIT_FAILURE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|