/*
- * 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>
-
-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 BOOL search
- (const char * string, const char * word, BOOL ignoreCase);
+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
-extern int
-grep_main(struct FileInfo * unused, int argc, char ** argv)
+static void do_grep(FILE *fp, char* needle, char *fileName, int tellName, int ignoreCase, int tellLine)
{
- FILE * fp;
- const char * word;
- const char * name;
- const char * cp;
- BOOL tellName;
- BOOL ignoreCase;
- BOOL tellLine;
- long line;
- char buf[BUF_SIZE];
-
- ignoreCase = FALSE;
- tellLine = FALSE;
-
- argc--;
- argv++;
- if (argc < 1)
- {
- fprintf(stderr, "%s", grep_usage);
- return 1;
- }
-
- if (**argv == '-')
- {
- argc--;
- cp = *argv++;
-
- while (*++cp) switch (*cp)
- {
- case 'i':
- ignoreCase = TRUE;
- break;
-
- case 'n':
- tellLine = TRUE;
- break;
-
- default:
- fprintf(stderr, "Unknown option\n");
- return 1;
- }
- }
-
- word = *argv++;
- argc--;
-
- tellName = (argc > 1);
-
- while (argc-- > 0)
- {
- name = *argv++;
-
- fp = fopen(name, "r");
-
- if (fp == NULL)
- {
- perror(name);
-
- continue;
- }
-
- line = 0;
+ char *cp;
+ long line = 0;
+ char haystack[BUF_SIZE];
- while (fgets(buf, sizeof(buf), fp))
- {
- line++;
+ while (fgets (haystack, sizeof (haystack), fp)) {
+ line++;
+ cp = &haystack[strlen (haystack) - 1];
- cp = &buf[strlen(buf) - 1];
+ if (*cp != '\n')
+ fprintf (stderr, "%s: Line too long\n", fileName);
- if (*cp != '\n')
- fprintf(stderr, "%s: Line too long\n", name);
+ if (find_match(haystack, needle, ignoreCase) == TRUE) {
+ if (tellName==TRUE)
+ printf ("%s:", fileName);
- if (search(buf, word, ignoreCase))
- {
- if (tellName)
- printf("%s: ", name);
+ if (tellLine==TRUE)
+ printf ("%ld:", line);
- if (tellLine)
- printf("%ld: ", line);
-
- fputs(buf, stdout);
- }
- }
-
- if (ferror(fp))
- perror(name);
-
- fclose(fp);
+ fputs (haystack, stdout);
}
- return 0;
+ }
}
-/*
- * See if the specified word is found in the specified string.
- */
-static BOOL
-search(const char * string, const char * word, BOOL ignoreCase)
+extern int grep_main (int argc, char **argv)
{
- const char * cp1;
- const char * cp2;
- int len;
- int lowFirst;
- int ch1;
- int ch2;
-
- len = strlen(word);
+ FILE *fp;
+ char *cp;
+ char *needle;
+ char *fileName;
+ int tellName=FALSE;
+ int ignoreCase=FALSE;
+ int tellLine=FALSE;
- if (!ignoreCase)
- {
- while (TRUE)
- {
- string = strchr(string, word[0]);
- if (string == NULL)
- return FALSE;
+ ignoreCase = FALSE;
+ tellLine = FALSE;
- if (memcmp(string, word, len) == 0)
- return TRUE;
+ argc--;
+ argv++;
+ if (argc < 1) {
+ usage(grep_usage);
+ }
- string++;
- }
+ if (**argv == '-') {
+ argc--;
+ cp = *argv++;
+
+ while (*++cp)
+ switch (*cp) {
+ case 'i':
+ ignoreCase = TRUE;
+ break;
+
+ case 'h':
+ tellName = TRUE;
+ break;
+
+ case 'n':
+ tellLine = TRUE;
+ break;
+
+ default:
+ usage(grep_usage);
+ }
+ }
+
+ needle = *argv++;
+ argc--;
+
+ if (argc==0) {
+ do_grep( stdin, needle, "stdin", FALSE, ignoreCase, tellLine);
+ } else {
+ while (argc-- > 0) {
+ fileName = *argv++;
+
+ fp = fopen (fileName, "r");
+ if (fp == NULL) {
+ perror (fileName);
+ continue;
+ }
+
+ do_grep( fp, needle, fileName, tellName, ignoreCase, tellLine);
+
+ 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++;
- }
-}
-#endif
-/* END CODE */
projects / oweals / busybox.git / blobdiff