+/* vi: set sw=4 ts=4: */
/*
- * 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
+/*
+ 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 <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"
+ "\t-q\tbe quiet. Returns 0 if result was found, 1 otherwise\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
+
+static int match = FALSE, beQuiet = FALSE;
+
+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];
-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";
+ while (fgets(haystack, sizeof(haystack), fp)) {
+ line++;
+ cp = &haystack[strlen(haystack) - 1];
+ if (*cp != '\n')
+ fprintf(stderr, "%s: Line too long\n", fileName);
+ if (find_match(haystack, needle, ignoreCase) == TRUE) {
+ if (tellName == TRUE)
+ printf("%s:", fileName);
-static BOOL search
- (const char * string, const char * word, BOOL ignoreCase);
+ if (tellLine == TRUE)
+ printf("%ld:", line);
+
+ if (beQuiet == FALSE)
+ fputs(haystack, stdout);
+
+ match = TRUE;
+ }
+ }
+}
-extern int
-grep_main(int argc, char ** argv)
+extern int grep_main(int argc, char **argv)
{
- FILE * fp;
- const char * word;
- const char * name;
- const char * cp;
- BOOL tellName;
- BOOL ignoreCase;
- BOOL tellLine;
- long line;
- char buf[BUF_SIZE];
+ FILE *fp;
+ char *cp;
+ char *needle;
+ char *fileName;
+ int tellName = TRUE;
+ int ignoreCase = TRUE;
+ int tellLine = FALSE;
+
ignoreCase = FALSE;
tellLine = FALSE;
argc--;
argv++;
- if (argc < 1)
- {
- fprintf(stderr, "%s", grep_usage);
- return 1;
+ if (argc < 1) {
+ usage(grep_usage);
}
- if (**argv == '-')
- {
+ if (**argv == '-') {
argc--;
cp = *argv++;
- while (*++cp) switch (*cp)
- {
+ while (*++cp)
+ switch (*cp) {
case 'i':
ignoreCase = TRUE;
break;
+ case 'h':
+ tellName = FALSE;
+ break;
+
case 'n':
tellLine = TRUE;
break;
+ case 'q':
+ beQuiet = 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;
-
- 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);
+ if (argc == 0) {
+ do_grep(stdin, needle, "stdin", FALSE, ignoreCase, tellLine);
+ } 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;
}
- }
-
- if (ferror(fp))
- perror(name);
-
- fclose(fp);
- }
- return 0;
-}
-
-
-/*
- * See if the specified word is found in the specified string.
- */
-static BOOL
-search(const char * string, const char * word, BOOL 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++;
- }
- }
-
- /*
- * 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);
+ do_grep(fp, needle, fileName, tellName, ignoreCase, tellLine);
+ if (ferror(fp))
+ perror(fileName);
+ fclose(fp);
}
- while (ch1 == ch2);
-
- string++;
}
+ exit(match);
}
-#endif
+
/* END CODE */
projects / oweals / busybox.git / blobdiff