mirror of
https://github.com/sheumann/hush.git
synced 2024-08-17 00:29:03 +00:00
188 lines
4.3 KiB
C
188 lines
4.3 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* 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
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <getopt.h>
|
|
#include <regex.h>
|
|
#include <string.h> /* for strerror() */
|
|
#include <errno.h>
|
|
#include "busybox.h"
|
|
|
|
extern int optind; /* in unistd.h */
|
|
extern int errno; /* for use with strerror() */
|
|
|
|
/* 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 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);
|
|
|
|
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) {
|
|
if (line[strlen(line)-1] == '\n')
|
|
line[strlen(line)-1] = '\0';
|
|
linenum++;
|
|
ret = regexec(®ex, line, 0, NULL, 0);
|
|
if (ret == 0 && !invert_search) { /* match */
|
|
|
|
/* if we found a match but were told to be quiet, stop here and
|
|
* return success */
|
|
if (be_quiet) {
|
|
regfree(®ex);
|
|
exit(0);
|
|
}
|
|
|
|
nmatches++;
|
|
print_matched_line(line, linenum);
|
|
|
|
}
|
|
else if (ret == REG_NOMATCH && invert_search) {
|
|
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;
|
|
|
|
/* do normal option parsing */
|
|
while ((opt = getopt(argc, argv, "iHhnqvsc")) > 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;
|
|
case 'c':
|
|
print_count_only++;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* argv[optind] should be the regex pattern; no pattern, no worky */
|
|
if (argv[optind] == NULL)
|
|
usage(grep_usage);
|
|
|
|
/* 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;
|
|
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, 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)
|
|
error_msg("%s: %s\n", cur_file, strerror(errno));
|
|
}
|
|
else {
|
|
grep_file(file);
|
|
fclose(file);
|
|
}
|
|
}
|
|
}
|
|
|
|
regfree(®ex);
|
|
|
|
if (!matched)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|