2 * Mini grep implementation for busybox using libc regex.
4 * Copyright (C) 1999,2000 by Lineo, inc.
5 * Written by Mark Whitley <markw@lineo.com>, <markw@enol.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include <string.h> /* for strerror() */
31 extern int optind; /* in unistd.h */
32 extern int errno; /* for use with strerror() */
35 static int ignore_case = 0;
36 static int print_filename = 0;
37 static int print_line_num = 0;
38 static int print_count_only = 0;
39 static int be_quiet = 0;
40 static int invert_search = 0;
41 static int suppress_err_msgs = 0;
44 static regex_t regex; /* storage space for compiled regular expression */
45 static int matched; /* keeps track of whether we ever matched */
46 static char *cur_file = NULL; /* the current file we are reading */
49 static void print_matched_line(char *line, int linenum)
55 printf("%s:", cur_file);
57 printf("%i:", linenum);
62 static void grep_file(FILE *file)
69 while ((line = get_line_from_file(file)) != NULL) {
71 ret = regexec(®ex, line, 0, NULL, 0);
72 if (ret == 0 && !invert_search) { /* match */
74 /* if we found a match but were told to be quiet, stop here and
82 print_matched_line(line, linenum);
85 else if (ret == REG_NOMATCH && invert_search) {
87 print_matched_line(line, linenum);
93 /* special-case post processing */
94 if (print_count_only) {
96 printf("%s:", cur_file);
97 printf("%i\n", nmatches);
100 /* record if we matched */
105 extern int grep_main(int argc, char **argv)
110 /* do normal option parsing */
111 while ((opt = getopt(argc, argv, "iHhnqvsc")) > 0) {
140 /* argv[optind] should be the regex pattern; no pattern, no worky */
141 if (argv[optind] == NULL)
144 /* compile the regular expression
145 * we're not going to mess with sub-expressions, and we need to
146 * treat newlines right. */
147 reflags = REG_NOSUB | REG_NEWLINE;
149 reflags |= REG_ICASE;
150 xregcomp(®ex, argv[optind], reflags);
152 /* argv[(optind+1)..(argc-1)] should be names of file to grep through. If
153 * there is more than one file to grep, we will print the filenames */
154 if ((argc-1) - (optind+1) > 0)
157 /* If no files were specified, or '-' was specified, take input from
158 * stdin. Otherwise, we grep through all the files specified. */
159 if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) {
165 for (i = optind + 1; i < argc; i++) {
167 file = fopen(cur_file, "r");
169 if (!suppress_err_msgs)
170 errorMsg("%s: %s\n", cur_file, strerror(errno));