/*
* Mini grep implementation for busybox using libc regex.
*
- * Copyright (C) 1999,2000 by Lineo, inc.
- * Written by Mark Whitley <markw@lineo.com>, <markw@enol.com>
+ * Copyright (C) 1999,2000,2001 by Lineo, inc.
+ * Written by Mark Whitley <markw@lineo.com>, <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
#include <stdio.h>
#include <stdlib.h>
-#include <unistd.h> /* for getopt() */
+#include <getopt.h>
#include <regex.h>
#include <string.h> /* for strerror() */
#include <errno.h>
-#include "internal.h"
+#include "busybox.h"
+
+extern void xregcomp(regex_t *preg, const char *regex, int cflags);
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 print_count_only = 0;
static int be_quiet = 0;
static int invert_search = 0;
static int suppress_err_msgs = 0;
/* globals */
static regex_t regex; /* storage space for compiled regular expression */
-static int nmatches = 0; /* keeps track of the number of matches */
+static int matched; /* keeps track of whether we ever matched */
static char *cur_file = NULL; /* the current file we are reading */
static void print_matched_line(char *line, int linenum)
{
+ if (print_count_only)
+ return;
+
if (print_filename)
printf("%s:", cur_file);
if (print_line_num)
printf("%i:", linenum);
- printf("%s", line);
+ puts(line);
}
static void grep_file(FILE *file)
char *line = NULL;
int ret;
int linenum = 0;
+ int nmatches = 0;
while ((line = get_line_from_file(file)) != NULL) {
+ chomp(line);
linenum++;
ret = regexec(®ex, line, 0, NULL, 0);
if (ret == 0 && !invert_search) { /* match */
}
nmatches++;
-
print_matched_line(line, linenum);
- } else if (ret == REG_NOMATCH && invert_search) {
+ }
+ else if (ret == REG_NOMATCH && invert_search) {
+ if (be_quiet) {
+ regfree(®ex);
+ exit(0);
+ }
+
+ nmatches++;
print_matched_line(line, linenum);
}
free(line);
}
+
+ /* special-case post processing */
+ if (print_count_only) {
+ if (print_filename)
+ printf("%s:", cur_file);
+ printf("%i\n", nmatches);
+ }
+
+ /* record if we matched */
+ if (nmatches != 0)
+ matched = 1;
}
extern int grep_main(int argc, char **argv)
{
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) {
+ while ((opt = getopt(argc, argv, "iHhnqvsc")) > 0) {
switch (opt) {
case 'i':
ignore_case++;
case 's':
suppress_err_msgs++;
break;
+ case 'c':
+ print_count_only++;
+ break;
}
}
if (argv[optind] == NULL)
usage(grep_usage);
- /* compile the regular expression */
- reflags = REG_NOSUB; /* we're not going to mess with sub-expressions */
+ /* compile the regular expression
+ * we're not going to mess with sub-expressions, and we need to
+ * treat newlines right. */
+ reflags = REG_NOSUB;
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);
- }
+ xregcomp(®ex, argv[optind], reflags);
/* 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, take input from stdin. Otherwise, we grep
- * through all the files specified. */
- if (argv[optind+1] == NULL) {
+ /* 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 {
+ }
+ else {
int i;
FILE *file;
for (i = optind + 1; i < argc; i++) {
file = fopen(cur_file, "r");
if (file == NULL) {
if (!suppress_err_msgs)
- fprintf(stderr, "grep: %s: %s\n", cur_file, strerror(errno));
- } else {
+ perror_msg("%s", cur_file);
+ }
+ else {
grep_file(file);
fclose(file);
}
regfree(®ex);
- if (nmatches == 0)
+ if (!matched)
return 1;
return 0;
projects / oweals / busybox.git / blobdiff