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759 lines
20 KiB
C
759 lines
20 KiB
C
/*
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* sed.c - very minimalist version of sed
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*
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* Copyright (C) 1999,2000 by Lineo, inc.
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* Written by Mark Whitley <markw@lineo.com>, <markw@enol.com>
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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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/*
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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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- backreferences in substitution expressions (\1, \2...\9)
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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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- transliteration (y/source-chars/dest-chars/) (use 'tr')
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- no support for characters other than the '/' character for regex matches
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- no pattern space hold space storing / swapping (x, etc.)
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- no labels / branching (: label, b, t, and friends)
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- and lots, lots more.
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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 "busybox.h"
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#define bb_need_full_version
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#define BB_DECLARE_EXTERN
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#include "messages.c"
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/* externs */
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extern int optind; /* in unistd.h */
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extern char *optarg; /* ditto */
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/* options */
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static int be_quiet = 0;
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static const int SUB_G = 1 << 0;
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#ifdef BB_FEATURE_SED_PATTERN_SPACE
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static const int SUB_P = 1 << 1;
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#endif
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struct sed_cmd {
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/* address storage */
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int beg_line; /* 'sed 1p' 0 == no begining line, apply commands to all lines */
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int end_line; /* 'sed 1,3p' 0 == no end line, use only beginning. -1 == $ */
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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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/* the command */
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char cmd; /* p,d,s (add more at your leisure :-) */
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/* substitution command specific fields */
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regex_t *sub_match; /* sed -e 's/sub_match/replace/' */
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char *replace; /* sed -e 's/sub_match/replace/' XXX: who will hold the \1 \2 \3s? */
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unsigned int num_backrefs:4; /* how many back references (\1..\9) */
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/* Note: GNU/POSIX sed does not save more than nine backrefs, so
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* we only use 4 bits to hold the number */
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#ifndef BB_FEATURE_SED_PATTERN_SPACE
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unsigned int sub_flags:1; /* sed -e 's/foo/bar/g' (global) */
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#else
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unsigned int sub_flags:2; /* sed -e 's/foo/bar/gp' (global/pattern) */
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#endif
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/* edit command (a,i,c) speicific field */
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char *editline;
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};
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/* globals */
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static struct sed_cmd *sed_cmds = NULL; /* growable arrary holding a sequence of sed cmds */
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static int ncmds = 0; /* number of sed commands */
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/*static char *cur_file = NULL;*/ /* file currently being processed XXX: do I need this? */
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#ifdef BB_FEATURE_CLEAN_UP
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static void destroy_cmd_strs()
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{
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if (sed_cmds == NULL)
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return;
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/* destroy all the elements in the array */
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while (--ncmds >= 0) {
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if (sed_cmds[ncmds].beg_match) {
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regfree(sed_cmds[ncmds].beg_match);
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free(sed_cmds[ncmds].beg_match);
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}
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if (sed_cmds[ncmds].end_match) {
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regfree(sed_cmds[ncmds].end_match);
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free(sed_cmds[ncmds].end_match);
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}
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if (sed_cmds[ncmds].sub_match) {
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regfree(sed_cmds[ncmds].sub_match);
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free(sed_cmds[ncmds].sub_match);
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}
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if (sed_cmds[ncmds].replace)
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free(sed_cmds[ncmds].replace);
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}
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/* destroy the array */
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free(sed_cmds);
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sed_cmds = NULL;
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}
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#endif
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#if 0
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/*
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* trim_str - trims leading and trailing space from a string
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*
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* Note: This returns a malloc'ed string so you must store and free it
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* XXX: This should be in the utility.c file.
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* XXX: This is now obsolete. Maybe it belongs nowhere.
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*/
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static char *trim_str(const char *str)
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{
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int i;
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char *retstr = strdup(str);
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/* trim leading whitespace */
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memmove(retstr, &retstr[strspn(retstr, " \n\t\v")], strlen(retstr));
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/* trim trailing whitespace */
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i = strlen(retstr) - 1;
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while (isspace(retstr[i]))
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i--;
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retstr[++i] = 0;
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/* Aside:
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*
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* you know, a strrspn() would really be nice cuz then we could say:
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*
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* retstr[strrspn(retstr, " \n\t\v") + 1] = 0;
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*/
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return retstr;
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}
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#endif
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#if 0
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/*
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* strrspn - works just like strspn() but goes from right to left instead of
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* left to right
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*/
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static size_t strrspn(const char *s, const char *accept)
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{
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size_t i = strlen(s);
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while (strchr(accept, s[--i]))
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;
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return i;
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}
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#endif
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/*
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* index_of_next_unescaped_slash - walks left to right through a string
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* beginning at a specified index and returns the index of the next forward
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* slash ('/') not preceeded by a backslash ('\').
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*/
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static int index_of_next_unescaped_slash(const char *str, int idx)
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{
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for ( ; str[idx]; idx++) {
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if (str[idx] == '/' && str[idx-1] != '\\')
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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 in the string just past where the address ends.
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*/
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static int get_address(const char *str, int *line, regex_t **regex)
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{
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char *my_str = strdup(str);
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int idx = 0;
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if (isdigit(my_str[idx])) {
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do {
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idx++;
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} while (isdigit(my_str[idx]));
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my_str[idx] = 0;
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*line = atoi(my_str);
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}
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else if (my_str[idx] == '$') {
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*line = -1;
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idx++;
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}
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else if (my_str[idx] == '/') {
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idx = index_of_next_unescaped_slash(my_str, ++idx);
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if (idx == -1)
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fatalError("unterminated match expression\n");
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my_str[idx] = '\0';
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*regex = (regex_t *)xmalloc(sizeof(regex_t));
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xregcomp(*regex, my_str+1, REG_NEWLINE);
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idx++; /* so it points to the next character after the last '/' */
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}
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else {
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errorMsg("get_address: no address found in string\n"
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"\t(you probably didn't check the string you passed me)\n");
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idx = -1;
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}
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free(my_str);
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return idx;
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}
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static char *strdup_substr(const char *str, int start, int end)
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{
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int size = end - start + 1;
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char *newstr = xmalloc(size);
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memcpy(newstr, str+start, size-1);
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newstr[size-1] = '\0';
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return newstr;
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}
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static int parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr)
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{
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int oldidx, cflags = REG_NEWLINE;
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char *match;
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int idx = 0;
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int j;
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/*
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* the string that gets passed to this function should look like this:
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* s/match/replace/gIp
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* || | |||
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* mandatory optional
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*
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* (all three of the '/' slashes are mandatory)
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*/
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/* verify that the 's' is followed by a 'slash' */
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if (substr[++idx] != '/')
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fatalError("bad format in substitution expression\n");
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/* save the match string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(substr, ++idx);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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match = strdup_substr(substr, oldidx, idx);
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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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/* sed_cmd->num_backrefs = 0; */ /* XXX: not needed? --apparently not */
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for (j = 0; match[j]; j++) {
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/* GNU/POSIX sed does not save more than nine backrefs */
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if (match[j] == '\\' && match[j+1] == '(' && sed_cmd->num_backrefs < 9)
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sed_cmd->num_backrefs++;
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}
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/* save the replacement string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(substr, ++idx);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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sed_cmd->replace = strdup_substr(substr, oldidx, idx);
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/* process the flags */
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while (substr[++idx]) {
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switch (substr[idx]) {
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case 'g':
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sed_cmd->sub_flags = SUB_G;
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break;
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case 'I':
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cflags |= REG_ICASE;
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break;
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#ifdef BB_FEATURE_SED_PATTERN_SPACE
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case 'p':
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sed_cmd->sub_flags = SUB_P;
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break;
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#endif
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default:
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/* any whitespace or semicolon trailing after a s/// is ok */
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if (strchr("; \t\v\n\r", substr[idx]))
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goto out;
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/* else */
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fatalError("bad option in substitution expression\n");
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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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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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free(match);
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return idx;
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}
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static int parse_edit_cmd(struct sed_cmd *sed_cmd, const char *editstr)
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{
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int idx = 0;
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int slashes_eaten = 0;
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char *ptr; /* shorthand */
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/*
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* the string that gets passed to this function should look like this:
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*
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* need one of these
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* |
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* | this backslash (immediately following the edit command) is mandatory
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* | |
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* [aic]\
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* TEXT1\
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* TEXT2\
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* TEXTN
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*
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* as soon as we hit a TEXT line that has no trailing '\', we're done.
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* this means a command like:
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*
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* i\
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* INSERTME
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*
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* is a-ok.
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*
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*/
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if (editstr[1] != '\\' && (editstr[2] != '\n' || editstr[2] != '\r'))
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fatalError("bad format in edit expression\n");
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/* store the edit line text */
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/* make editline big enough to accomodate the extra '\n' we will tack on
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* to the end */
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sed_cmd->editline = xmalloc(strlen(&editstr[3]) + 2);
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strcpy(sed_cmd->editline, &editstr[3]);
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ptr = sed_cmd->editline;
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/* now we need to go through * and: s/\\[\r\n]$/\n/g on the edit line */
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while (ptr[idx]) {
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while (ptr[idx] != '\\' && (ptr[idx+1] != '\n' || ptr[idx+1] != '\r')) {
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idx++;
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if (!ptr[idx]) {
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goto out;
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}
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}
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/* move the newline over the '\' before it (effectively eats the '\') */
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memmove(&ptr[idx], &ptr[idx+1], strlen(&ptr[idx+1]));
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ptr[strlen(ptr)-1] = 0;
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slashes_eaten++;
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/* substitue \r for \n if needed */
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if (ptr[idx] == '\r')
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ptr[idx] = '\n';
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}
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out:
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ptr[idx] = '\n';
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ptr[idx+1] = 0;
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/* this accounts for discrepancies between the modified string and the
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* original string passed in to this function */
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idx += slashes_eaten;
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/* this accounts for the fact that A) we started at index 3, not at index
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* 0 and B) that we added an extra '\n' at the end (if you think the next
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* line should read 'idx += 4' remember, arrays are zero-based) */
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idx += 3;
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return idx;
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}
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static char *parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
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{
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int idx = 0;
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/* parse the command
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* format is: [addr][,addr]cmd
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* |----||-----||-|
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* part1 part2 part3
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*/
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/* first part (if present) is an address: either a number or a /regex/ */
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if (isdigit(cmdstr[idx]) || cmdstr[idx] == '/')
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idx = get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
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/* second part (if present) will begin with a comma */
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if (cmdstr[idx] == ',')
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idx += get_address(&cmdstr[++idx], &sed_cmd->end_line, &sed_cmd->end_match);
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/* last part (mandatory) will be a command */
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if (cmdstr[idx] == '\0')
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fatalError("missing command\n");
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if (!strchr("pdsaic", cmdstr[idx])) /* <-- XXX add new commands here */
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fatalError("invalid command\n");
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sed_cmd->cmd = cmdstr[idx];
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/* special-case handling for (s)ubstitution */
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if (sed_cmd->cmd == 's') {
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idx += parse_subst_cmd(sed_cmd, &cmdstr[idx]);
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}
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/* special-case handling for (a)ppend, (i)nsert, and (c)hange */
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else if (strchr("aic", cmdstr[idx])) {
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if (sed_cmd->end_line || sed_cmd->end_match)
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fatalError("only a beginning address can be specified for edit commands\n");
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idx += parse_edit_cmd(sed_cmd, &cmdstr[idx]);
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}
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/* if it was a single-letter command (such as 'p' or 'd') we need to
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* increment the index past that command */
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else
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idx++;
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/* give back whatever's left over */
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return (char *)&cmdstr[idx];
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}
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static void add_cmd_str(const char *cmdstr)
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{
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char *mystr = (char *)cmdstr;
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do {
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/* trim leading whitespace and semicolons */
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memmove(mystr, &mystr[strspn(mystr, "; \n\r\t\v")], strlen(mystr));
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/* if we ate the whole thing, that means there was just trailing
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* whitespace or a final / no-op semicolon. either way, get out */
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if (strlen(mystr) == 0)
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return;
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/* if this is a comment, jump past it and keep going */
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if (mystr[0] == '#') {
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mystr = strpbrk(mystr, ";\n\r");
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continue;
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}
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/* grow the array */
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sed_cmds = xrealloc(sed_cmds, sizeof(struct sed_cmd) * (++ncmds));
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/* zero new element */
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memset(&sed_cmds[ncmds-1], 0, sizeof(struct sed_cmd));
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/* load command string into new array element, get remainder */
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mystr = parse_cmd_str(&sed_cmds[ncmds-1], mystr);
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} while (mystr && strlen(mystr));
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}
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static void load_cmd_file(char *filename)
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{
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FILE *cmdfile;
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char *line;
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char *nextline;
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cmdfile = xfopen(filename, "r");
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while ((line = get_line_from_file(cmdfile)) != NULL) {
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/* if a line ends with '\' it needs the next line appended to it */
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while (line[strlen(line)-2] == '\\' &&
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(nextline = get_line_from_file(cmdfile)) != NULL) {
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line = xrealloc(line, strlen(line) + strlen(nextline) + 1);
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strcat(line, nextline);
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free(nextline);
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}
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/* eat trailing newline (if any) --if I don't do this, edit commands
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* (aic) will print an extra newline */
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if (line[strlen(line)-1] == '\n')
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line[strlen(line)-1] = 0;
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add_cmd_str(line);
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free(line);
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}
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}
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static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch)
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{
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int i;
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/* go through the replacement string */
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for (i = 0; replace[i]; i++) {
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/* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
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if (replace[i] == '\\' && isdigit(replace[i+1])) {
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int j;
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char tmpstr[2];
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int backref;
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++i; /* i now indexes the backref number, instead of the leading slash */
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|
tmpstr[0] = replace[i];
|
|
tmpstr[1] = 0;
|
|
backref = atoi(tmpstr);
|
|
/* print out the text held in regmatch[backref] */
|
|
for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
|
|
fputc(line[j], stdout);
|
|
}
|
|
|
|
/* if we find a backslash escaped character, print the character */
|
|
else if (replace[i] == '\\') {
|
|
++i;
|
|
fputc(replace[i], stdout);
|
|
}
|
|
|
|
/* if we find an unescaped '&' print out the whole matched text.
|
|
* fortunately, regmatch[0] contains the indicies to the whole matched
|
|
* expression (kinda seems like it was designed for just such a
|
|
* purpose...) */
|
|
else if (replace[i] == '&' && replace[i-1] != '\\') {
|
|
int j;
|
|
for (j = regmatch[0].rm_so; j < regmatch[0].rm_eo; j++)
|
|
fputc(line[j], stdout);
|
|
}
|
|
/* nothing special, just print this char of the replacement string to stdout */
|
|
else
|
|
fputc(replace[i], stdout);
|
|
}
|
|
}
|
|
|
|
static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
|
|
{
|
|
int altered = 0;
|
|
|
|
/* we only substitute if the substitution 'search' expression matches */
|
|
if (regexec(sed_cmd->sub_match, line, 0, NULL, 0) == 0) {
|
|
regmatch_t *regmatch = xmalloc(sizeof(regmatch_t) * (sed_cmd->num_backrefs+1));
|
|
int i;
|
|
char *ptr = (char *)line;
|
|
|
|
while (*ptr) {
|
|
/* if we can match the search string... */
|
|
if (regexec(sed_cmd->sub_match, ptr, sed_cmd->num_backrefs+1, regmatch, 0) == 0) {
|
|
/* print everything before the match, */
|
|
for (i = 0; i < regmatch[0].rm_so; i++) {
|
|
#ifdef BB_FEATURE_SED_PATTERN_SPACE
|
|
if(!be_quiet || (sed_cmd->sub_flags & SUB_P))
|
|
#endif
|
|
fputc(ptr[i], stdout);
|
|
}
|
|
|
|
/* then print the substitution in its place */
|
|
#ifdef BB_FEATURE_SED_PATTERN_SPACE
|
|
if(!be_quiet || (sed_cmd->sub_flags & SUB_P))
|
|
#endif
|
|
print_subst_w_backrefs(ptr, sed_cmd->replace, regmatch);
|
|
|
|
/* then advance past the match */
|
|
ptr += regmatch[0].rm_eo;
|
|
|
|
/* and flag that something has changed */
|
|
altered++;
|
|
|
|
/* if we're not doing this globally... */
|
|
if (!sed_cmd->sub_flags & SUB_G)
|
|
break;
|
|
}
|
|
/* if we COULD NOT match the search string (meaning we've gone past
|
|
* all previous instances), get out */
|
|
else
|
|
break;
|
|
}
|
|
|
|
/* is there anything left to print? */
|
|
#ifdef BB_FEATURE_SED_PATTERN_SPACE
|
|
if (*ptr && (!be_quiet || sed_cmds->sub_flags & SUB_P))
|
|
#else
|
|
if (*ptr)
|
|
#endif
|
|
fputs(ptr, stdout);
|
|
|
|
/* cleanup */
|
|
free(regmatch);
|
|
}
|
|
|
|
return altered;
|
|
}
|
|
|
|
static int do_sed_command(const struct sed_cmd *sed_cmd, const char *line)
|
|
{
|
|
int altered = 0;
|
|
|
|
switch (sed_cmd->cmd) {
|
|
|
|
case 'p':
|
|
fputs(line, stdout);
|
|
break;
|
|
|
|
case 'd':
|
|
altered++;
|
|
break;
|
|
|
|
case 's':
|
|
altered = do_subst_command(sed_cmd, line);
|
|
break;
|
|
|
|
case 'a':
|
|
fputs(line, stdout);
|
|
fputs(sed_cmd->editline, stdout);
|
|
altered++;
|
|
break;
|
|
|
|
case 'i':
|
|
fputs(sed_cmd->editline, stdout);
|
|
break;
|
|
|
|
case 'c':
|
|
fputs(sed_cmd->editline, stdout);
|
|
altered++;
|
|
break;
|
|
}
|
|
|
|
return altered;
|
|
}
|
|
|
|
static void process_file(FILE *file)
|
|
{
|
|
char *line = NULL;
|
|
static int linenum = 0; /* GNU sed does not restart counting lines at EOF */
|
|
unsigned int still_in_range = 0;
|
|
int line_altered;
|
|
int i;
|
|
|
|
/* go through every line in the file */
|
|
while ((line = get_line_from_file(file)) != NULL) {
|
|
|
|
linenum++;
|
|
line_altered = 0;
|
|
|
|
/* for every line, go through all the commands */
|
|
for (i = 0; i < ncmds; i++) {
|
|
|
|
/* are we acting on a range of matched lines? */
|
|
if (sed_cmds[i].beg_match && sed_cmds[i].end_match) {
|
|
if (still_in_range || regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0) {
|
|
line_altered += do_sed_command(&sed_cmds[i], line);
|
|
still_in_range = 1;
|
|
if (regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0)
|
|
still_in_range = 0;
|
|
}
|
|
}
|
|
|
|
/* are we trying to match a single line? */
|
|
else if (sed_cmds[i].beg_match) {
|
|
if (regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0)
|
|
line_altered += do_sed_command(&sed_cmds[i], line);
|
|
}
|
|
|
|
/* are we acting on a range of line numbers? */
|
|
else if (sed_cmds[i].beg_line > 0 && sed_cmds[i].end_line != 0) {
|
|
if (linenum >= sed_cmds[i].beg_line && (sed_cmds[i].end_line == -1 || linenum <= sed_cmds[i].end_line))
|
|
line_altered += do_sed_command(&sed_cmds[i], line);
|
|
}
|
|
|
|
/* are we acting on a specified line number */
|
|
else if (sed_cmds[i].beg_line > 0) {
|
|
if (linenum == sed_cmds[i].beg_line)
|
|
line_altered += do_sed_command(&sed_cmds[i], line);
|
|
}
|
|
|
|
/* not acting on matches or line numbers. act on every line */
|
|
else
|
|
line_altered += do_sed_command(&sed_cmds[i], line);
|
|
|
|
}
|
|
|
|
/* we will print the line unless we were told to be quiet or if
|
|
* the line was altered (via a 'd'elete or 's'ubstitution) */
|
|
#ifndef BB_FEATURE_SED_PATTERN_SPACE
|
|
if (!be_quiet &&!line_altered)
|
|
#else
|
|
/* we where specificly requested to print the output */
|
|
if ((!be_quiet || (sed_cmds[i].sub_flags & SUB_P)) && !line_altered)
|
|
#endif
|
|
fputs(line, stdout);
|
|
|
|
free(line);
|
|
}
|
|
}
|
|
|
|
extern int sed_main(int argc, char **argv)
|
|
{
|
|
int opt;
|
|
|
|
#ifdef BB_FEATURE_CLEAN_UP
|
|
/* destroy command strings on exit */
|
|
if (atexit(destroy_cmd_strs) == -1) {
|
|
perror("sed");
|
|
exit(1);
|
|
}
|
|
#endif
|
|
|
|
/* do normal option parsing */
|
|
while ((opt = getopt(argc, argv, "hne:f:")) > 0) {
|
|
switch (opt) {
|
|
case 'h':
|
|
usage(sed_usage);
|
|
break;
|
|
case 'n':
|
|
be_quiet++;
|
|
break;
|
|
case 'e':
|
|
add_cmd_str(optarg);
|
|
break;
|
|
case 'f':
|
|
load_cmd_file(optarg);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* 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 (ncmds == 0) {
|
|
if (argv[optind] == NULL)
|
|
usage(sed_usage);
|
|
else {
|
|
add_cmd_str(argv[optind]);
|
|
optind++;
|
|
}
|
|
}
|
|
|
|
|
|
/* 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 || (strcmp(argv[optind], "-") == 0)) {
|
|
process_file(stdin);
|
|
}
|
|
else {
|
|
int i;
|
|
FILE *file;
|
|
for (i = optind; i < argc; i++) {
|
|
file = fopen(argv[i], "r");
|
|
if (file == NULL) {
|
|
errorMsg("%s: %s\n", argv[i], strerror(errno));
|
|
} else {
|
|
process_file(file);
|
|
fclose(file);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|