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 be_quiet = 0;
39 static int invert_search = 0;
40 static int suppress_err_msgs = 0;
43 static regex_t regex; /* storage space for compiled regular expression */
44 static int nmatches = 0; /* keeps track of the number of matches */
45 static char *cur_file = NULL; /* the current file we are reading */
48 static void print_matched_line(char *line, int linenum)
51 printf("%s:", cur_file);
53 printf("%i:", linenum);
58 static void grep_file(FILE *file)
64 while ((line = get_line_from_file(file)) != NULL) {
66 ret = regexec(®ex, line, 0, NULL, 0);
67 if (ret == 0 && !invert_search) { /* match */
69 /* if we found a match but were told to be quiet, stop here and
78 print_matched_line(line, linenum);
80 } else if (ret == REG_NOMATCH && invert_search) {
81 print_matched_line(line, linenum);
88 extern int grep_main(int argc, char **argv)
93 /* do special-case option parsing */
94 if (argv[1] && (strcmp(argv[1], "--help") == 0))
97 /* do normal option parsing */
98 while ((opt = getopt(argc, argv, "iHhnqvs")) > 0) {
124 /* argv[optind] should be the regex pattern; no pattern, no worky */
125 if (argv[optind] == NULL)
128 /* compile the regular expression
129 * we're not going to mess with sub-expressions, and we need to
130 * treat newlines right. */
131 reflags = REG_NOSUB | REG_NEWLINE;
133 reflags |= REG_ICASE;
134 xregcomp(®ex, argv[optind], reflags);
136 /* argv[(optind+1)..(argc-1)] should be names of file to grep through. If
137 * there is more than one file to grep, we will print the filenames */
138 if ((argc-1) - (optind+1) > 0)
141 /* If no files were specified, or '-' was specified, take input from
142 * stdin. Otherwise, we grep through all the files specified. */
143 if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) {
148 for (i = optind + 1; i < argc; i++) {
150 file = fopen(cur_file, "r");
152 if (!suppress_err_msgs)
153 errorMsg("%s: %s\n", cur_file, strerror(errno));