/*
- * Copyright (c) 1999 by David I. Bell
- * Permission is granted to use, distribute, or modify this source,
- * provided that this copyright notice remains intact.
+ * Mini grep implementation for busybox
*
- * The "grep" command, taken from sash.
- * This provides basic file searching.
*
- * Permission to distribute this code under the GPL has been granted.
- * Modified for busybox by Erik Andersen <andersee@debian.org> <andersen@lineo.com>
+ * Copyright (C) 1999 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
+ *
*/
#include "internal.h"
-#ifdef BB_GREP
-
+#include "regexp.h"
#include <stdio.h>
#include <dirent.h>
#include <errno.h>
#include <time.h>
#include <ctype.h>
+static const char grep_usage[] =
+"grep [OPTIONS]... PATTERN [FILE]...\n\n"
+"Search 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\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
+
-const char grep_usage[] =
- "Search the input file(s) for lines matching the given pattern.\n"
- "\tI search stdin if no files are given.\n"
- "\tI can't grok full regular expressions.\n"
- "usage: grep [in] PATTERN [FILES]...\n"
- "\ti=ignore case, n=list line numbers\n";
+static void do_grep(FILE *fp, char* needle, char *fileName, int tellName, int ignoreCase, int tellLine)
+{
+ char *cp;
+ long line = 0;
+ char haystack[BUF_SIZE];
+ while (fgets (haystack, sizeof (haystack), fp)) {
+ line++;
+ cp = &haystack[strlen (haystack) - 1];
+ if (*cp != '\n')
+ fprintf (stderr, "%s: Line too long\n", fileName);
-static int search (const char *string, const char *word, int ignoreCase);
+ if (find_match(haystack, needle, ignoreCase) == TRUE) {
+ if (tellName==TRUE)
+ printf ("%s:", fileName);
+
+ if (tellLine==TRUE)
+ printf ("%ld:", line);
+
+ fputs (haystack, stdout);
+ }
+ }
+}
extern int grep_main (int argc, char **argv)
{
FILE *fp;
- const char *word;
- const char *name;
- const char *cp;
- int tellName;
- int ignoreCase;
- int tellLine;
- long line;
- char buf[BUF_SIZE];
+ char *cp;
+ char *needle;
+ char *fileName;
+ int tellName=FALSE;
+ int ignoreCase=FALSE;
+ int tellLine=FALSE;
+
ignoreCase = FALSE;
tellLine = FALSE;
argc--;
argv++;
if (argc < 1) {
- fprintf (stderr, "%s", grep_usage);
- return 1;
+ usage(grep_usage);
}
if (**argv == '-') {
ignoreCase = TRUE;
break;
+ case 'h':
+ tellName = TRUE;
+ break;
+
case 'n':
tellLine = TRUE;
break;
default:
- fprintf (stderr, "Unknown option\n");
- return 1;
+ usage(grep_usage);
}
}
- word = *argv++;
+ needle = *argv++;
argc--;
- tellName = (argc > 1);
-
- while (argc-- > 0) {
- name = *argv++;
-
- fp = fopen (name, "r");
-
- if (fp == NULL) {
- perror (name);
-
- continue;
- }
-
- line = 0;
+ if (argc==0) {
+ do_grep( stdin, needle, "stdin", FALSE, ignoreCase, tellLine);
+ } else {
+ while (argc-- > 0) {
+ fileName = *argv++;
- while (fgets (buf, sizeof (buf), fp)) {
- line++;
-
- cp = &buf[strlen (buf) - 1];
-
- if (*cp != '\n')
- fprintf (stderr, "%s: Line too long\n", name);
-
- if (search (buf, word, ignoreCase)) {
- if (tellName)
- printf ("%s: ", name);
-
- if (tellLine)
- printf ("%ld: ", line);
-
- fputs (buf, stdout);
+ fp = fopen (fileName, "r");
+ if (fp == NULL) {
+ perror (fileName);
+ continue;
}
- }
- if (ferror (fp))
- perror (name);
+ do_grep( fp, needle, fileName, tellName, ignoreCase, tellLine);
- fclose (fp);
- }
- return 0;
-}
-
-
-/*
- * See if the specified word is found in the specified string.
- */
-static int search (const char *string, const char *word, int ignoreCase)
-{
- const char *cp1;
- const char *cp2;
- int len;
- int lowFirst;
- int ch1;
- int ch2;
-
- len = strlen (word);
-
- if (!ignoreCase) {
- while (TRUE) {
- string = strchr (string, word[0]);
-
- if (string == NULL)
- return FALSE;
-
- if (memcmp (string, word, len) == 0)
- return TRUE;
-
- string++;
+ if (ferror (fp))
+ perror (fileName);
+ fclose (fp);
}
}
+ exit( TRUE);
+}
- /*
- * Here if we need to check case independence.
- * Do the search by lower casing both strings.
- */
- lowFirst = *word;
-
- if (isupper (lowFirst))
- lowFirst = tolower (lowFirst);
-
- while (TRUE) {
- while (*string && (*string != lowFirst) &&
- (!isupper (*string) || (tolower (*string) != lowFirst))) {
- string++;
- }
-
- if (*string == '\0')
- return FALSE;
-
- cp1 = string;
- cp2 = word;
-
- do {
- if (*cp2 == '\0')
- return TRUE;
-
- ch1 = *cp1++;
-
- if (isupper (ch1))
- ch1 = tolower (ch1);
-
- ch2 = *cp2++;
-
- if (isupper (ch2))
- ch2 = tolower (ch2);
- }
- while (ch1 == ch2);
+/* END CODE */
- string++;
- }
- return (TRUE);
-}
-#endif
-/* END CODE */
projects / oweals / busybox.git / blobdiff