/*
- * Mini grep implementation for busybox
+ * Mini grep implementation for busybox using libc regex.
*
- *
- * Copyright (C) 1999 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
+ * Copyright (C) 1999,2000,2001 by Lineo, inc.
+ * Written by Mark Whitley <markw@lineo.com>, <markw@codepoet.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
*
*/
-#include "internal.h"
#include <stdio.h>
-#include <dirent.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <regex.h>
+#include <string.h> /* for strerror() */
#include <errno.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-#include <ctype.h>
+#include "busybox.h"
-static const char grep_usage[] =
-"grep [-ihn]... PATTERN [FILE]...\n"
-"Search for PATTERN in each FILE or standard input.\n\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"
-"This version of grep matches strings (not full regexps).\n";
+extern int optind; /* in unistd.h */
+extern int errno; /* for use with strerror() */
+extern void xregcomp(regex_t *preg, const char *regex, int cflags); /* in busybox.h */
+/* options */
+static int ignore_case = 0;
+static int print_filename = 0;
+static int print_line_num = 0;
+static int print_count_only = 0;
+static int be_quiet = 0;
+static int invert_search = 0;
+static int suppress_err_msgs = 0;
-/*
- * See if the specified needle is found in the specified haystack.
- */
-static int search (const char *haystack, const char *needle, int ignoreCase)
-{
-
- if (ignoreCase == FALSE) {
- haystack = strstr (haystack, needle);
- if (haystack == NULL)
- return FALSE;
- return TRUE;
- } else {
- int i;
- char needle1[BUF_SIZE];
- char haystack1[BUF_SIZE];
-
- strncpy( haystack1, haystack, sizeof(haystack1));
- strncpy( needle1, needle, sizeof(needle1));
- for( i=0; i<sizeof(haystack1) && haystack1[i]; i++)
- haystack1[i]=tolower( haystack1[i]);
- for( i=0; i<sizeof(needle1) && needle1[i]; i++)
- needle1[i]=tolower( needle1[i]);
- haystack = strstr (haystack1, needle1);
- if (haystack == NULL)
- return FALSE;
- return TRUE;
- }
-}
+#ifdef BB_FEATURE_GREP_CONTEXT
+extern char *optarg; /* in getopt.h */
+static int lines_before = 0;
+static int lines_after = 0;
+static char **before_buf = NULL;
+static int last_line_printed = 0;
+#endif /* BB_FEATURE_GREP_CONTEXT */
+/* globals used internally */
+static regex_t regex; /* storage space for compiled regular expression */
+static int matched; /* keeps track of whether we ever matched */
+static char *cur_file = NULL; /* the current file we are reading */
-extern int grep_main (int argc, char **argv)
+static void print_line(const char *line, int linenum, char decoration)
{
- FILE *fp;
- const char *needle;
- const char *name;
- const char *cp;
- int tellName=TRUE;
- int ignoreCase=FALSE;
- int tellLine=FALSE;
- long line;
- char buf[BUF_SIZE];
-
- ignoreCase = FALSE;
- tellLine = FALSE;
-
- argc--;
- argv++;
- if (argc < 1) {
- usage(grep_usage);
- }
-
- if (**argv == '-') {
- argc--;
- cp = *argv++;
-
- while (*++cp)
- switch (*cp) {
- case 'i':
- ignoreCase = TRUE;
- break;
-
- case 'h':
- tellName = FALSE;
- break;
-
- case 'n':
- tellLine = TRUE;
- break;
-
- default:
- usage(grep_usage);
- }
- }
-
- needle = *argv++;
- argc--;
-
- while (argc-- > 0) {
- name = *argv++;
-
- fp = fopen (name, "r");
- if (fp == NULL) {
- perror (name);
- continue;
+#ifdef BB_FEATURE_GREP_CONTEXT
+ /* possibly print the little '--' seperator */
+ if (last_line_printed && last_line_printed < linenum - 1) {
+ puts("--");
}
+ last_line_printed = linenum;
+#endif
+ if (print_filename)
+ printf("%s%c", cur_file, decoration);
+ if (print_line_num)
+ printf("%i%c", linenum, decoration);
+ puts(line);
+}
+
+static void grep_file(FILE *file)
+{
+ char *line = NULL;
+ int ret;
+ int linenum = 0;
+ int nmatches = 0;
+#ifdef BB_FEATURE_GREP_CONTEXT
+ int print_n_lines_after = 0;
+ int curpos = 0; /* track where we are in the circular 'before' buffer */
+ int idx = 0; /* used for iteration through the circular buffer */
+#endif /* BB_FEATURE_GREP_CONTEXT */
+
+ while ((line = get_line_from_file(file)) != NULL) {
+ chomp(line);
+ linenum++;
+
+ /*
+ * test for a postitive-assertion match (regexec returns success (0)
+ * and the user did not specify invert search), or a negative-assertion
+ * match (regexec returns failure (REG_NOMATCH) and the user specified
+ * invert search)
+ */
+ ret = regexec(®ex, line, 0, NULL, 0);
+ if ((ret == 0 && !invert_search) || (ret == REG_NOMATCH && invert_search)) {
+
+ /* if we found a match but were told to be quiet, stop here and
+ * return success */
+ if (be_quiet) {
+ regfree(®ex);
+ exit(0);
+ }
+
+ /* otherwise, keep track of matches and print the matched line */
+ nmatches++;
+ if (!print_count_only) {
+#ifdef BB_FEATURE_GREP_CONTEXT
+ int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
- line = 0;
+ /* if we were told to print 'before' lines and there is at least
+ * one line in the circular buffer, print them */
+ if (lines_before && before_buf[prevpos] != NULL)
+ {
+ int first_buf_entry_line_num = linenum - lines_before;
- while (fgets (buf, sizeof (buf), fp)) {
- line++;
- cp = &buf[strlen (buf) - 1];
+ /* advance to the first entry in the circular buffer, and
+ * figure out the line number is of the first line in the
+ * buffer */
+ idx = curpos;
+ while (before_buf[idx] == NULL) {
+ idx = (idx + 1) % lines_before;
+ first_buf_entry_line_num++;
+ }
- if (*cp != '\n')
- fprintf (stderr, "%s: Line too long\n", name);
+ /* now print each line in the buffer, clearing them as we go */
+ while (before_buf[idx] != NULL) {
+ print_line(before_buf[idx], first_buf_entry_line_num, '-');
+ free(before_buf[idx]);
+ before_buf[idx] = NULL;
+ idx = (idx + 1) % lines_before;
+ first_buf_entry_line_num++;
+ }
- if (search (buf, needle, ignoreCase)==TRUE) {
- if (tellName==TRUE)
- printf ("%s: ", name);
+ }
- if (tellLine==TRUE)
- printf ("%ld: ", line);
+ /* make a note that we need to print 'after' lines */
+ print_n_lines_after = lines_after;
+#endif /* BB_FEATURE_GREP_CONTEXT */
+ print_line(line, linenum, ':');
+ }
+ }
+#ifdef BB_FEATURE_GREP_CONTEXT
+ else { /* no match */
+ /* Add the line to the circular 'before' buffer */
+ if(lines_before)
+ {
+ if(before_buf[curpos])
+ free(before_buf[curpos]);
+ before_buf[curpos] = strdup(line);
+ curpos = (curpos + 1) % lines_before;
+ }
+ }
- fputs (buf, stdout);
- }
+ /* if we need to print some context lines after the last match, do so */
+ if (print_n_lines_after && (last_line_printed != linenum)) {
+ print_line(line, linenum, '-');
+ print_n_lines_after--;
+ }
+#endif /* BB_FEATURE_GREP_CONTEXT */
+ free(line);
}
- if (ferror (fp))
- perror (name);
+ /* special-case post processing */
+ if (print_count_only) {
+ if (print_filename)
+ printf("%s:", cur_file);
+ printf("%i\n", nmatches);
+ }
- fclose (fp);
- }
- exit( TRUE);
+ /* remember if we matched */
+ if (nmatches != 0)
+ matched = 1;
}
+extern int grep_main(int argc, char **argv)
+{
+ int opt;
+ int reflags;
+#ifdef BB_FEATURE_GREP_CONTEXT
+ char *junk;
+#endif
+
+ /* do normal option parsing */
+ while ((opt = getopt(argc, argv, "iHhnqvsc"
+#ifdef BB_FEATURE_GREP_CONTEXT
+"A:B:C:"
+#endif
+)) > 0) {
+ switch (opt) {
+ case 'i':
+ ignore_case++;
+ break;
+ case 'H':
+ print_filename++;
+ break;
+ case 'h':
+ print_filename--;
+ break;
+ case 'n':
+ print_line_num++;
+ break;
+ case 'q':
+ be_quiet++;
+ break;
+ case 'v':
+ invert_search++;
+ break;
+ case 's':
+ suppress_err_msgs++;
+ break;
+ case 'c':
+ print_count_only++;
+ break;
+#ifdef BB_FEATURE_GREP_CONTEXT
+ case 'A':
+ lines_after = strtoul(optarg, &junk, 10);
+ if(*junk != '\0')
+ error_msg_and_die("invalid context length argument");
+ break;
+ case 'B':
+ lines_before = strtoul(optarg, &junk, 10);
+ if(*junk != '\0')
+ error_msg_and_die("invalid context length argument");
+ before_buf = (char **)calloc(lines_before, sizeof(char *));
+ break;
+ case 'C':
+ lines_after = lines_before = strtoul(optarg, &junk, 10);
+ if(*junk != '\0')
+ error_msg_and_die("invalid context length argument");
+ before_buf = (char **)calloc(lines_before, sizeof(char *));
+ break;
+#endif /* BB_FEATURE_GREP_CONTEXT */
+ }
+ }
+
+ /* argv[optind] should be the regex pattern; no pattern, no worky */
+ if (argv[optind] == NULL)
+ show_usage();
+
+ /* sanity check */
+ if (print_count_only || be_quiet) {
+ print_line_num = 0;
+#ifdef BB_FEATURE_GREP_CONTEXT
+ lines_before = 0;
+ lines_after = 0;
+#endif
+ }
+
+ /* compile the regular expression
+ * we're not going to mess with sub-expressions, and we need to
+ * treat newlines right. */
+ reflags = REG_NOSUB;
+ if (ignore_case)
+ reflags |= REG_ICASE;
+ xregcomp(®ex, argv[optind], reflags);
+
+ /* argv[(optind+1)..(argc-1)] should be names of file to grep through. If
+ * there is more than one file to grep, we will print the filenames */
+ if ((argc-1) - (optind+1) > 0)
+ print_filename++;
-/* END CODE */
+ /* If no files were specified, or '-' was specified, take input from
+ * stdin. Otherwise, we grep through all the files specified. */
+ if (argv[optind+1] == NULL || (strcmp(argv[optind+1], "-") == 0)) {
+ grep_file(stdin);
+ }
+ else {
+ int i;
+ FILE *file;
+ for (i = optind + 1; i < argc; i++) {
+ cur_file = argv[i];
+ file = fopen(cur_file, "r");
+ if (file == NULL) {
+ if (!suppress_err_msgs)
+ perror_msg("%s", cur_file);
+ }
+ else {
+ grep_file(file);
+ fclose(file);
+ }
+ }
+ }
+ regfree(®ex);
+ return !matched; /* invert return value 0 = success, 1 = failed */
+}
projects / oweals / busybox.git / blobdiff