159 lines
3.2 KiB
C
159 lines
3.2 KiB
C
/*
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* Mini grep implementation for busybox
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*
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* Copyright (C) 1998 by Erik Andersen <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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#include "internal.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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static const char grep_usage[] =
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"grep [-ihn]... PATTERN [FILE]...\n"
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"Search for PATTERN in each FILE or standard input.\n\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\n"
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"This version of grep matches strings (not full regexps).\n";
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/*
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* See if the specified needle is found in the specified haystack.
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*/
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static int search (const char *haystack, const char *needle, int ignoreCase)
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{
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if (ignoreCase == FALSE) {
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haystack = strstr (haystack, needle);
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if (haystack == NULL)
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return FALSE;
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return TRUE;
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} else {
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int i;
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char needle1[BUF_SIZE];
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char haystack1[BUF_SIZE];
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strncpy( haystack1, haystack, sizeof(haystack1));
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strncpy( needle1, needle, sizeof(needle1));
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for( i=0; i<sizeof(haystack1) && haystack1[i]; i++)
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haystack1[i]=tolower( haystack1[i]);
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for( i=0; i<sizeof(needle1) && needle1[i]; i++)
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needle1[i]=tolower( needle1[i]);
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haystack = strstr (haystack1, needle1);
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if (haystack == NULL)
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return FALSE;
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return TRUE;
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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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const char *needle;
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const char *name;
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const char *cp;
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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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long line;
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char buf[BUF_SIZE];
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ignoreCase = FALSE;
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tellLine = FALSE;
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argc--;
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argv++;
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if (argc < 1) {
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usage(grep_usage);
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}
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if (**argv == '-') {
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argc--;
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cp = *argv++;
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while (*++cp)
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switch (*cp) {
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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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default:
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usage(grep_usage);
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}
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}
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needle = *argv++;
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argc--;
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while (argc-- > 0) {
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name = *argv++;
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fp = fopen (name, "r");
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if (fp == NULL) {
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perror (name);
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continue;
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}
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line = 0;
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while (fgets (buf, sizeof (buf), fp)) {
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line++;
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cp = &buf[strlen (buf) - 1];
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if (*cp != '\n')
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fprintf (stderr, "%s: Line too long\n", name);
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if (search (buf, needle, ignoreCase)==TRUE) {
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if (tellName==TRUE)
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printf ("%s: ", name);
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if (tellLine==TRUE)
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printf ("%ld: ", line);
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fputs (buf, stdout);
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}
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}
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if (ferror (fp))
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perror (name);
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fclose (fp);
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}
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exit( TRUE);
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}
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/* END CODE */
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