171 lines
3.7 KiB
C
171 lines
3.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini grep implementation for busybox
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*
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*
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* Copyright (C) 1999,2000 by Lineo, inc.
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* Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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/*
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18-Dec-1999 Konstantin Boldyshev <konst@voshod.com>
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+ -q option (be quiet)
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+ exit code depending on grep result (TRUE or FALSE)
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(useful for scripts)
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*/
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#include "internal.h"
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#include "regexp.h"
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#include <stdio.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <time.h>
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#include <ctype.h>
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#define BB_DECLARE_EXTERN
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#define bb_need_too_few_args
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#include "messages.c"
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static const char grep_usage[] =
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"grep [OPTIONS]... PATTERN [FILE]...\n"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\nSearch for PATTERN in each FILE or standard input.\n\n"
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"OPTIONS:\n"
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"\t-h\tsuppress the prefixing filename on output\n"
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"\t-i\tignore case distinctions\n"
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"\t-n\tprint line number with output lines\n"
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"\t-q\tbe quiet. Returns 0 if result was found, 1 otherwise\n"
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"\t-v\tselect non-matching lines\n\n"
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#if defined BB_REGEXP
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"This version of grep matches full regular expressions.\n";
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#else
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"This version of grep matches strings (not regular expressions).\n"
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#endif
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#endif
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;
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static int match = FALSE, beQuiet = FALSE;
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static void do_grep(FILE * fp, char *needle, char *fileName, int tellName,
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int ignoreCase, int tellLine, int invertSearch)
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{
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long line = 0;
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char *haystack;
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int truth = !invertSearch;
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while ((haystack = cstring_lineFromFile(fp))) {
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line++;
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if (find_match(haystack, needle, ignoreCase) == truth) {
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if (tellName == TRUE)
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printf("%s:", fileName);
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if (tellLine == TRUE)
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printf("%ld:", line);
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if (beQuiet == FALSE)
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fputs(haystack, stdout);
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match = TRUE;
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}
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free(haystack);
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}
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}
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extern int grep_main(int argc, char **argv)
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{
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FILE *fp;
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char *needle;
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char *fileName;
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int tellName = TRUE;
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int ignoreCase = FALSE;
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int tellLine = FALSE;
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int invertSearch = FALSE;
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if (argc < 1) {
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usage(grep_usage);
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}
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argv++;
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while (--argc >= 0 && *argv && (**argv == '-')) {
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while (*++(*argv)) {
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switch (**argv) {
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case 'i':
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ignoreCase = TRUE;
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break;
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case 'h':
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tellName = FALSE;
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break;
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case 'n':
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tellLine = TRUE;
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break;
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case 'q':
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beQuiet = TRUE;
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break;
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case 'v':
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invertSearch = TRUE;
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break;
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default:
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usage(grep_usage);
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}
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}
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argv++;
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}
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if (argc == 0 || *argv == NULL) {
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fatalError(too_few_args, "grep");
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}
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needle = *argv++;
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argc--;
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if (argc == 0) {
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do_grep(stdin, needle, "stdin", FALSE, ignoreCase, tellLine, invertSearch);
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} else {
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/* Never print the filename for just one file */
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if (argc == 1)
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tellName = FALSE;
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while (argc-- > 0) {
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fileName = *argv++;
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fp = fopen(fileName, "r");
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if (fp == NULL) {
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perror(fileName);
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continue;
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}
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do_grep(fp, needle, fileName, tellName, ignoreCase, tellLine, invertSearch);
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if (ferror(fp))
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perror(fileName);
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fclose(fp);
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}
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}
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return(match);
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}
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/* END CODE */
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