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
25 #include <unistd.h> /* for getopt() */
27 #include <string.h> /* for strerror() */
31 extern int optind; /* in unistd.h */
32 extern int errno; /* for use with strerror() */
34 static const char grep_usage[] =
35 "grep [-ihHnqvs] pattern [files...]\n"
36 #ifndef BB_FEATURE_TRIVIAL_HELP
37 "\nSearch for PATTERN in each FILE or standard input.\n\n"
39 "\t-H\tprefix output lines with filename where match was found\n"
40 "\t-h\tsuppress the prefixing filename on output\n"
41 "\t-i\tignore case distinctions\n"
42 "\t-n\tprint line number with output lines\n"
43 "\t-q\tbe quiet. Returns 0 if result was found, 1 otherwise\n"
44 "\t-v\tselect non-matching lines\n"
45 "\t-s\tsuppress file open/read error messages\n\n"
50 static int ignore_case = 0;
51 static int print_filename = 0;
52 static int print_line_num = 0;
53 static int be_quiet = 0;
54 static int invert_search = 0;
55 static int suppress_err_msgs = 0;
58 static regex_t regex; /* storage space for compiled regular expression */
59 static int nmatches = 0; /* keeps track of the number of matches */
60 static char *cur_file = NULL; /* the current file we are reading */
63 static void print_matched_line(char *line, int linenum)
66 printf("%s:", cur_file);
68 printf("%i:", linenum);
73 static void grep_file(FILE *file)
79 while ((line = get_line_from_file(file)) != NULL) {
81 ret = regexec(®ex, line, 0, NULL, 0);
82 if (ret == 0 && !invert_search) { /* match */
84 /* if we found a match but were told to be quiet, stop here and
93 print_matched_line(line, linenum);
95 } else if (ret == REG_NOMATCH && invert_search) {
96 print_matched_line(line, linenum);
103 extern int grep_main(int argc, char **argv)
109 /* do special-case option parsing */
110 if (argv[1] && (strcmp(argv[1], "--help") == 0))
113 /* do normal option parsing */
114 while ((opt = getopt(argc, argv, "iHhnqvs")) > 0) {
140 /* argv[optind] should be the regex pattern; no pattern, no worky */
141 if (argv[optind] == NULL)
144 /* compile the regular expression */
145 reflags = REG_NOSUB; /* we're not going to mess with sub-expressions */
147 reflags |= REG_ICASE;
148 if ((ret = regcomp(®ex, argv[optind], reflags)) != 0) {
149 int errmsgsz = regerror(ret, ®ex, NULL, 0);
150 char *errmsg = malloc(errmsgsz);
151 if (errmsg == NULL) {
152 fprintf(stderr, "grep: memory error\n");
156 regerror(ret, ®ex, errmsg, errmsgsz);
157 fprintf(stderr, "grep: %s\n", errmsg);
163 /* argv[(optind+1)..(argc-1)] should be names of file to grep through. If
164 * there is more than one file to grep, we will print the filenames */
165 if ((argc-1) - (optind+1) > 0)
168 /* If no files were specified, or '-' was specified, take input from
169 * stdin. Otherwise, we grep through all the files specified. */
170 if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) {
175 for (i = optind + 1; i < argc; i++) {
177 file = fopen(cur_file, "r");
179 if (!suppress_err_msgs)
180 fprintf(stderr, "grep: %s: %s\n", cur_file, strerror(errno));