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/* vi: set sw=4 ts=4: */
/*
* Mini grep implementation for busybox
*
*
* Copyright (C) 1999,2000 by Lineo, inc.
* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.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
*
*/
/*
18-Dec-1999 Konstantin Boldyshev <konst@voshod.com>
+ -q option (be quiet)
+ exit code depending on grep result (TRUE or FALSE)
(useful for scripts)
*/
#include "internal.h"
#include "regexp.h"
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <time.h>
#include <ctype.h>
#define BB_DECLARE_EXTERN
#define bb_need_too_few_args
#include "messages.c"
static const char grep_usage[] =
"grep [OPTIONS]... PATTERN [FILE]...\n"
#ifndef BB_FEATURE_TRIVIAL_HELP
"\nSearch for PATTERN in each FILE or standard input.\n\n"
"OPTIONS:\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\n"
#if defined BB_REGEXP
"This version of grep matches full regular expresions.\n";
#else
"This version of grep matches strings (not regular expresions).\n"
#endif
#endif
;
static int match = FALSE, beQuiet = FALSE;
static void do_grep(FILE * fp, char *needle, char *fileName, int tellName,
int ignoreCase, int tellLine, int invertSearch)
{
long line = 0;
char *haystack;
int truth = !invertSearch;
while ((haystack = cstring_lineFromFile(fp))) {
line++;
if (find_match(haystack, needle, ignoreCase) == truth) {
if (tellName == TRUE)
printf("%s:", fileName);
if (tellLine == TRUE)
printf("%ld:", line);
if (beQuiet == FALSE)
fputs(haystack, stdout);
match = TRUE;
}
free(haystack);
}
}
extern int grep_main(int argc, char **argv)
{
FILE *fp;
char *needle;
char *fileName;
int tellName = TRUE;
int ignoreCase = FALSE;
int tellLine = FALSE;
int invertSearch = FALSE;
if (argc < 1) {
usage(grep_usage);
}
argv++;
while (--argc >= 0 && *argv && (**argv == '-')) {
while (*++(*argv)) {
switch (**argv) {
case 'i':
ignoreCase = TRUE;
break;
case 'h':
tellName = FALSE;
break;
case 'n':
tellLine = TRUE;
break;
case 'q':
beQuiet = TRUE;
break;
case 'v':
invertSearch = TRUE;
break;
default:
usage(grep_usage);
}
}
argv++;
}
if (argc == 0 || *argv == NULL) {
fatalError(too_few_args, "grep");
}
needle = *argv++;
argc--;
if (argc == 0) {
do_grep(stdin, needle, "stdin", FALSE, ignoreCase, tellLine, invertSearch);
} else {
/* Never print the filename for just one file */
if (argc == 1)
tellName = FALSE;
while (argc-- > 0) {
fileName = *argv++;
fp = fopen(fileName, "r");
if (fp == NULL) {
perror(fileName);
continue;
}
do_grep(fp, needle, fileName, tellName, ignoreCase, tellLine, invertSearch);
if (ferror(fp))
perror(fileName);
fclose(fp);
}
}
exit(match);
}
/* END CODE */
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