/*
- * Copyright (c) 1999 by David I. Bell
- * Permission is granted to use, distribute, or modify this source,
- * provided that this copyright notice remains intact.
+ * Mini grep implementation for busybox using libc regex.
*
- * The "grep" command, taken from sash.
- * This provides basic file searching.
+ * Copyright (C) 1999,2000 by Lineo, inc.
+ * Written by Mark Whitley <markw@lineo.com>, <markw@enol.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- * Permission to distribute this code under the GPL has been granted.
- * Modified for busybox by Erik Andersen <andersee@debian.org> <andersen@lineo.com>
*/
-#include "internal.h"
-#ifdef BB_GREP
-
#include <stdio.h>
-#include <dirent.h>
+#include <stdlib.h>
+#include <unistd.h> /* for getopt() */
+#include <regex.h>
+#include <string.h> /* for strerror() */
#include <errno.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-#include <ctype.h>
-
-
-const char grep_usage[] =
- "Search the input file(s) for lines matching the given pattern.\n"
- "\tI search stdin if no files are given.\n"
- "\tI can't grok full regular expressions.\n"
- "usage: grep [in] PATTERN [FILES]...\n"
- "\ti=ignore case, n=list line numbers\n";
+#include "internal.h"
+extern int optind; /* in unistd.h */
+extern int errno; /* for use with strerror() */
+
+static const char grep_usage[] =
+ "grep [-ihHnqvs] pattern [files...]\n"
+#ifndef BB_FEATURE_TRIVIAL_HELP
+ "\nSearch for PATTERN in each FILE or standard input.\n\n"
+ "Options:\n"
+ "\t-H\tprefix output lines with filename where match was found\n"
+ "\t-h\tsuppress the prefixing filename on output\n"
+ "\t-i\tignore case distinctions\n"
+ "\t-n\tprint line number with output lines\n"
+ "\t-q\tbe quiet. Returns 0 if result was found, 1 otherwise\n"
+ "\t-v\tselect non-matching lines\n"
+ "\t-s\tsuppress file open/read error messages\n\n"
+#endif
+ ;
+/* options */
+static int ignore_case = 0;
+static int print_filename = 0;
+static int print_line_num = 0;
+static int be_quiet = 0;
+static int invert_search = 0;
+static int suppress_err_msgs = 0;
-static int search (const char *string, const char *word, int ignoreCase);
+/* globals */
+static regex_t regex; /* storage space for compiled regular expression */
+static int nmatches = 0; /* keeps track of the number of matches */
+static char *cur_file = NULL; /* the current file we are reading */
-extern int grep_main (int argc, char **argv)
+static void print_matched_line(char *line, int linenum)
{
- FILE *fp;
- const char *word;
- const char *name;
- const char *cp;
- int tellName;
- int ignoreCase;
- int tellLine;
- long line;
- char buf[BUF_SIZE];
-
- ignoreCase = FALSE;
- tellLine = FALSE;
-
- argc--;
- argv++;
- if (argc < 1) {
- fprintf (stderr, "%s", grep_usage);
- return 1;
- }
-
- if (**argv == '-') {
- argc--;
- cp = *argv++;
-
- while (*++cp)
- switch (*cp) {
- case 'i':
- ignoreCase = TRUE;
- break;
-
- case 'n':
- tellLine = TRUE;
- break;
-
- default:
- fprintf (stderr, "Unknown option\n");
- return 1;
- }
- }
+ if (print_filename)
+ printf("%s:", cur_file);
+ if (print_line_num)
+ printf("%i:", linenum);
- word = *argv++;
- argc--;
-
- tellName = (argc > 1);
-
- while (argc-- > 0) {
- name = *argv++;
-
- fp = fopen (name, "r");
-
- if (fp == NULL) {
- perror (name);
-
- continue;
- }
+ printf("%s", line);
+}
- line = 0;
+static void grep_file(FILE *file)
+{
+ char *line = NULL;
+ int ret;
+ int linenum = 0;
- while (fgets (buf, sizeof (buf), fp)) {
- line++;
+ while ((line = get_line_from_file(file)) != NULL) {
+ linenum++;
+ ret = regexec(®ex, line, 0, NULL, 0);
+ if (ret == 0 && !invert_search) { /* match */
- cp = &buf[strlen (buf) - 1];
+ /* if we found a match but were told to be quiet, stop here and
+ * return success */
+ if (be_quiet) {
+ regfree(®ex);
+ exit(0);
+ }
- if (*cp != '\n')
- fprintf (stderr, "%s: Line too long\n", name);
+ nmatches++;
- if (search (buf, word, ignoreCase)) {
- if (tellName)
- printf ("%s: ", name);
+ print_matched_line(line, linenum);
- if (tellLine)
- printf ("%ld: ", line);
+ } else if (ret == REG_NOMATCH && invert_search) {
+ print_matched_line(line, linenum);
+ }
- fputs (buf, stdout);
- }
+ free(line);
}
-
- if (ferror (fp))
- perror (name);
-
- fclose (fp);
- }
- return 0;
}
-
-/*
- * See if the specified word is found in the specified string.
- */
-static int search (const char *string, const char *word, int ignoreCase)
+extern int grep_main(int argc, char **argv)
{
- const char *cp1;
- const char *cp2;
- int len;
- int lowFirst;
- int ch1;
- int ch2;
-
- len = strlen (word);
-
- if (!ignoreCase) {
- while (TRUE) {
- string = strchr (string, word[0]);
-
- if (string == NULL)
- return FALSE;
-
- if (memcmp (string, word, len) == 0)
- return TRUE;
-
- string++;
+ int opt;
+ int reflags;
+ int ret;
+
+ /* do special-case option parsing */
+ if (argv[1] && (strcmp(argv[1], "--help") == 0))
+ usage(grep_usage);
+
+ /* do normal option parsing */
+ while ((opt = getopt(argc, argv, "iHhnqvs")) > 0) {
+ switch (opt) {
+ case 'i':
+ ignore_case++;
+ break;
+ case 'H':
+ print_filename++;
+ break;
+ case 'h':
+ print_filename--;
+ break;
+ case 'n':
+ print_line_num++;
+ break;
+ case 'q':
+ be_quiet++;
+ break;
+ case 'v':
+ invert_search++;
+ break;
+ case 's':
+ suppress_err_msgs++;
+ break;
+ }
}
- }
-
- /*
- * Here if we need to check case independence.
- * Do the search by lower casing both strings.
- */
- lowFirst = *word;
-
- if (isupper (lowFirst))
- lowFirst = tolower (lowFirst);
- while (TRUE) {
- while (*string && (*string != lowFirst) &&
- (!isupper (*string) || (tolower (*string) != lowFirst))) {
- string++;
+ /* argv[optind] should be the regex pattern; no pattern, no worky */
+ if (argv[optind] == NULL)
+ usage(grep_usage);
+
+ /* compile the regular expression */
+ reflags = REG_NOSUB; /* we're not going to mess with sub-expressions */
+ if (ignore_case)
+ reflags |= REG_ICASE;
+ if ((ret = regcomp(®ex, argv[optind], reflags)) != 0) {
+ int errmsgsz = regerror(ret, ®ex, NULL, 0);
+ char *errmsg = malloc(errmsgsz);
+ if (errmsg == NULL) {
+ fprintf(stderr, "grep: memory error\n");
+ regfree(®ex);
+ exit(1);
+ }
+ regerror(ret, ®ex, errmsg, errmsgsz);
+ fprintf(stderr, "grep: %s\n", errmsg);
+ free(errmsg);
+ regfree(®ex);
+ exit(1);
}
- if (*string == '\0')
- return FALSE;
-
- cp1 = string;
- cp2 = word;
-
- do {
- if (*cp2 == '\0')
- return TRUE;
-
- ch1 = *cp1++;
-
- if (isupper (ch1))
- ch1 = tolower (ch1);
-
- ch2 = *cp2++;
+ /* argv[(optind+1)..(argc-1)] should be names of file to grep through. If
+ * there is more than one file to grep, we will print the filenames */
+ if ((argc-1) - (optind+1) > 0)
+ print_filename++;
+
+ /* If no files were specified, or '-' was specified, take input from
+ * stdin. Otherwise, we grep through all the files specified. */
+ if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) {
+ grep_file(stdin);
+ } else {
+ int i;
+ FILE *file;
+ for (i = optind + 1; i < argc; i++) {
+ cur_file = argv[i];
+ file = fopen(cur_file, "r");
+ if (file == NULL) {
+ if (!suppress_err_msgs)
+ fprintf(stderr, "grep: %s: %s\n", cur_file, strerror(errno));
+ } else {
+ grep_file(file);
+ fclose(file);
+ }
+ }
+ }
- if (isupper (ch2))
- ch2 = tolower (ch2);
+ regfree(®ex);
- }
- while (ch1 == ch2);
+ if (nmatches == 0)
+ return 1;
- string++;
- }
- return (TRUE);
+ return 0;
}
-
-#endif
-/* END CODE */
projects / oweals / busybox.git / blobdiff