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diff --git a/busybox/findutils/grep.c b/busybox/findutils/grep.c
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+/*
+ * Mini grep implementation for busybox using libc regex.
+ *
+ * Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
+ * Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
+ *
+ * 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
+ *
+ */
+/*
+ * Apr 2004 by Vladimir Oleynik <dzo@simtreas.ru> -
+ * correction "-e pattern1 -e pattern2" logic and more optimizations.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <regex.h>
+#include <string.h>
+#include <errno.h>
+#include "busybox.h"
+
+
+/* options */
+#define GREP_OPTS "lnqvscFiHhe:f:L"
+#define GREP_OPT_l (1<<0)
+static char print_files_with_matches;
+#define GREP_OPT_n (1<<1)
+static char print_line_num;
+#define GREP_OPT_q (1<<2)
+static char be_quiet;
+#define GREP_OPT_v (1<<3)
+typedef char invert_search_t;
+static invert_search_t invert_search;
+#define GREP_OPT_s (1<<4)
+static char suppress_err_msgs;
+#define GREP_OPT_c (1<<5)
+static char print_match_counts;
+#define GREP_OPT_F (1<<6)
+static char fgrep_flag;
+#define GREP_OPT_i (1<<7)
+#define GREP_OPT_H (1<<8)
+#define GREP_OPT_h (1<<9)
+#define GREP_OPT_e (1<<10)
+#define GREP_OPT_f (1<<11)
+#define GREP_OPT_L (1<<12)
+static char print_files_without_matches;
+#ifdef CONFIG_FEATURE_GREP_CONTEXT
+#define GREP_OPT_CONTEXT "A:B:C"
+#define GREP_OPT_A (1<<13)
+#define GREP_OPT_B (1<<14)
+#define GREP_OPT_C (1<<15)
+#define GREP_OPT_E (1<<16)
+#else
+#define GREP_OPT_CONTEXT ""
+#define GREP_OPT_E (1<<13)
+#endif
+#ifdef CONFIG_FEATURE_GREP_EGREP_ALIAS
+# define OPT_EGREP "E"
+#else
+# define OPT_EGREP ""
+#endif
+
+static int reflags;
+static int print_filename;
+
+#ifdef CONFIG_FEATURE_GREP_CONTEXT
+static int lines_before;
+static int lines_after;
+static char **before_buf;
+static int last_line_printed;
+#endif /* CONFIG_FEATURE_GREP_CONTEXT */
+
+/* globals used internally */
+static llist_t *pattern_head; /* growable list of patterns to match */
+static char *cur_file; /* the current file we are reading */
+
+
+static void print_line(const char *line, int linenum, char decoration)
+{
+#ifdef CONFIG_FEATURE_GREP_CONTEXT
+ /* possibly print the little '--' separator */
+ if ((lines_before || lines_after) && last_line_printed &&
+ last_line_printed < linenum - 1) {
+ puts("--");
+ }
+ last_line_printed = linenum;
+#endif
+ if (print_filename)
+ printf("%s%c", cur_file, decoration);
+ if (print_line_num)
+ printf("%i%c", linenum, decoration);
+ puts(line);
+}
+
+extern void xregcomp(regex_t *preg, const char *regex, int cflags);
+
+
+static int grep_file(FILE *file)
+{
+ char *line;
+ invert_search_t ret;
+ int linenum = 0;
+ int nmatches = 0;
+#ifdef CONFIG_FEATURE_GREP_CONTEXT
+ int print_n_lines_after = 0;
+ int curpos = 0; /* track where we are in the circular 'before' buffer */
+ int idx = 0; /* used for iteration through the circular buffer */
+#endif /* CONFIG_FEATURE_GREP_CONTEXT */
+
+ while ((line = bb_get_chomped_line_from_file(file)) != NULL) {
+ llist_t *pattern_ptr = pattern_head;
+
+ linenum++;
+ ret = 0;
+ while (pattern_ptr) {
+ if (fgrep_flag) {
+ ret = strstr(line, pattern_ptr->data) != NULL;
+ } else {
+ /*
+ * test for a postitive-assertion match (regexec returns success (0)
+ * and the user did not specify invert search), or a negative-assertion
+ * match (regexec returns failure (REG_NOMATCH) and the user specified
+ * invert search)
+ */
+ regex_t regex;
+ xregcomp(&regex, pattern_ptr->data, reflags);
+ ret |= regexec(&regex, line, 0, NULL, 0) == 0;
+ regfree(&regex);
+ }
+ pattern_ptr = pattern_ptr->link;
+ } /* while (pattern_ptr) */
+
+ if ((ret ^ invert_search)) {
+
+ if (print_files_with_matches || be_quiet)
+ free(line);
+
+ /* if we found a match but were told to be quiet, stop here */
+ if (be_quiet || print_files_without_matches)
+ return -1;
+
+ /* keep track of matches */
+ nmatches++;
+
+ /* if we're just printing filenames, we stop after the first match */
+ if (print_files_with_matches)
+ break;
+
+ /* print the matched line */
+ if (print_match_counts == 0) {
+#ifdef CONFIG_FEATURE_GREP_CONTEXT
+ int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
+
+ /* if we were told to print 'before' lines and there is at least
+ * one line in the circular buffer, print them */
+ if (lines_before && before_buf[prevpos] != NULL) {
+ int first_buf_entry_line_num = linenum - lines_before;
+
+ /* advance to the first entry in the circular buffer, and
+ * figure out the line number is of the first line in the
+ * buffer */
+ idx = curpos;
+ while (before_buf[idx] == NULL) {
+ idx = (idx + 1) % lines_before;
+ first_buf_entry_line_num++;
+ }
+
+ /* now print each line in the buffer, clearing them as we go */
+ while (before_buf[idx] != NULL) {
+ print_line(before_buf[idx], first_buf_entry_line_num, '-');
+ free(before_buf[idx]);
+ before_buf[idx] = NULL;
+ idx = (idx + 1) % lines_before;
+ first_buf_entry_line_num++;
+ }
+ }
+
+ /* make a note that we need to print 'after' lines */
+ print_n_lines_after = lines_after;
+#endif /* CONFIG_FEATURE_GREP_CONTEXT */
+ print_line(line, linenum, ':');
+ }
+ }
+#ifdef CONFIG_FEATURE_GREP_CONTEXT
+ else { /* no match */
+ /* Add the line to the circular 'before' buffer */
+ if(lines_before) {
+ free(before_buf[curpos]);
+ before_buf[curpos] = bb_xstrdup(line);
+ curpos = (curpos + 1) % lines_before;
+ }
+ }
+
+ /* if we need to print some context lines after the last match, do so */
+ if (print_n_lines_after && (last_line_printed != linenum)) {
+ print_line(line, linenum, '-');
+ print_n_lines_after--;
+ }
+#endif /* CONFIG_FEATURE_GREP_CONTEXT */
+ free(line);
+ }
+
+
+ /* special-case file post-processing for options where we don't print line
+ * matches, just filenames and possibly match counts */
+
+ /* grep -c: print [filename:]count, even if count is zero */
+ if (print_match_counts) {
+ if (print_filename)
+ printf("%s:", cur_file);
+ printf("%d\n", nmatches);
+ }
+
+ /* grep -l: print just the filename, but only if we grepped the line in the file */
+ if (print_files_with_matches && nmatches > 0) {
+ puts(cur_file);
+ }
+
+ /* grep -L: print just the filename, but only if we didn't grep the line in the file */
+ if (print_files_without_matches && nmatches == 0) {
+ puts(cur_file);
+ }
+
+ return nmatches;
+}
+
+static void load_regexes_from_file(llist_t *fopt)
+{
+ char *line;
+ FILE *f;
+
+ while(fopt) {
+ llist_t *cur = fopt;
+ char *ffile = cur->data;
+
+ fopt = cur->link;
+ free(cur);
+ f = bb_xfopen(ffile, "r");
+ while ((line = bb_get_chomped_line_from_file(f)) != NULL) {
+ pattern_head = llist_add_to(pattern_head, line);
+ }
+ }
+}
+
+
+extern int grep_main(int argc, char **argv)
+{
+ FILE *file;
+ int matched;
+ unsigned long opt;
+ llist_t *fopt = NULL;
+
+ /* do normal option parsing */
+#ifdef CONFIG_FEATURE_GREP_CONTEXT
+ {
+ char *junk;
+ char *slines_after;
+ char *slines_before;
+ char *Copt;
+
+ bb_opt_complementaly = "H-h:e*:f*:C-AB";
+ opt = bb_getopt_ulflags(argc, argv,
+ GREP_OPTS GREP_OPT_CONTEXT OPT_EGREP,
+ &pattern_head, &fopt,
+ &slines_after, &slines_before, &Copt);
+
+ if(opt & GREP_OPT_C) {
+ /* C option unseted A and B options, but next -A or -B
+ may be ovewrite own option */
+ if(!(opt & GREP_OPT_A)) /* not overwtited */
+ slines_after = Copt;
+ if(!(opt & GREP_OPT_B)) /* not overwtited */
+ slines_before = Copt;
+ opt |= GREP_OPT_A|GREP_OPT_B; /* set for parse now */
+ }
+ if(opt & GREP_OPT_A) {
+ lines_after = strtoul(slines_after, &junk, 10);
+ if(*junk != '\0')
+ bb_error_msg_and_die("invalid context length argument");
+ }
+ if(opt & GREP_OPT_B) {
+ lines_before = strtoul(slines_before, &junk, 10);
+ if(*junk != '\0')
+ bb_error_msg_and_die("invalid context length argument");
+ }
+ /* sanity checks after parse may be invalid numbers ;-) */
+ if ((opt & (GREP_OPT_c|GREP_OPT_q|GREP_OPT_l|GREP_OPT_L))) {
+ opt &= ~GREP_OPT_n;
+ lines_before = 0;
+ lines_after = 0;
+ } else if(lines_before > 0)
+ before_buf = (char **)xcalloc(lines_before, sizeof(char *));
+ }
+#else
+ /* with auto sanity checks */
+ bb_opt_complementaly = "H-h:e*:f*:c-n:q-n:l-n";
+ opt = bb_getopt_ulflags(argc, argv, GREP_OPTS OPT_EGREP,
+ &pattern_head, &fopt);
+
+#endif
+ print_files_with_matches = opt & GREP_OPT_l;
+ print_files_without_matches = (opt & GREP_OPT_L) != 0;
+ print_line_num = opt & GREP_OPT_n;
+ be_quiet = opt & GREP_OPT_q;
+ invert_search = (opt & GREP_OPT_v) != 0; /* 0 | 1 */
+ suppress_err_msgs = opt & GREP_OPT_s;
+ print_match_counts = opt & GREP_OPT_c;
+ fgrep_flag = opt & GREP_OPT_F;
+ if(opt & GREP_OPT_H)
+ print_filename++;
+ if(opt & GREP_OPT_h)
+ print_filename--;
+ if(opt & GREP_OPT_f)
+ load_regexes_from_file(fopt);
+
+#ifdef CONFIG_FEATURE_GREP_EGREP_ALIAS
+ if(bb_applet_name[0] == 'e' || (opt & GREP_OPT_E))
+ reflags = REG_EXTENDED | REG_NOSUB;
+ else
+#endif
+ reflags = REG_NOSUB;
+
+ if(opt & GREP_OPT_i)
+ reflags |= REG_ICASE;
+
+ argv += optind;
+ argc -= optind;
+
+ /* 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 (pattern_head == NULL) {
+ if (*argv == NULL)
+ bb_show_usage();
+ else {
+ pattern_head = llist_add_to(pattern_head, *argv++);
+ argc--;
+ }
+ }
+
+ /* argv[(optind)..(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) {
+ print_filename++;
+
+ /* If no files were specified, or '-' was specified, take input from
+ * stdin. Otherwise, we grep through all the files specified. */
+ } else if (argc == 0) {
+ argc++;
+ }
+ matched = 0;
+ while (argc--) {
+ cur_file = *argv++;
+ if(!cur_file || (*cur_file == '-' && !cur_file[1])) {
+ cur_file = "-";
+ file = stdin;
+ } else {
+ file = fopen(cur_file, "r");
+ }
+ if (file == NULL) {
+ if (!suppress_err_msgs)
+ bb_perror_msg("%s", cur_file);
+ } else {
+ matched += grep_file(file);
+ if(matched < 0) {
+ /* we found a match but were told to be quiet, stop here and
+ * return success */
+ break;
+ }
+ fclose(file);
+ }
+ }
+
+#ifdef CONFIG_FEATURE_CLEAN_UP
+ /* destroy all the elments in the pattern list */
+ while (pattern_head) {
+ llist_t *pattern_head_ptr = pattern_head;
+
+ pattern_head = pattern_head->link;
+ free(pattern_head_ptr);
+ }
+#endif
+
+ return !matched; /* invert return value 0 = success, 1 = failed */
+}
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