-/* vi: set sw=4 ts=4: */
/*
- * 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
*
*/
-/*
- 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 <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>
-
-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";
+#include "busybox.h"
+
+
+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 reflags = REG_NOSUB;
+static int print_filename = 0;
+static int print_line_num = 0;
+static int print_match_counts = 0;
+static int be_quiet = 0;
+static int invert_search = 0;
+static int suppress_err_msgs = 0;
+static int print_files_with_matches = 0;
+
+#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 *regexes = NULL; /* growable array of compiled regular expressions */
+static int nregexes = 0; /* number of elements in above arrary */
+static int matched; /* keeps track of whether we ever matched */
+static char *cur_file = NULL; /* the current file we are reading */
+
+
+static void print_line(const char *line, int linenum, char decoration)
+{
+#ifdef BB_FEATURE_GREP_CONTEXT
+ /* possibly print the little '--' seperator */
+ if ((lines_before || lines_after) && 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 int match = FALSE, beQuiet = FALSE;
-static void do_grep(FILE * fp, char *needle, char *fileName, int tellName,
- int ignoreCase, int tellLine)
+static void grep_file(FILE *file)
{
- char *cp;
- long line = 0;
- char haystack[BUF_SIZE];
+ char *line = NULL;
+ int ret;
+ int linenum = 0;
+ int nmatches = 0;
+ int i;
+#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 (fgets(haystack, sizeof(haystack), fp)) {
- line++;
- cp = &haystack[strlen(haystack) - 1];
+ while ((line = get_line_from_file(file)) != NULL) {
+ chomp(line);
+ linenum++;
- if (*cp != '\n')
- fprintf(stderr, "%s: Line too long\n", fileName);
+ for (i = 0; i < nregexes; i++) {
+ /*
+ * 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(®exes[i], line, 0, NULL, 0);
+ if ((ret == 0 && !invert_search) || (ret == REG_NOMATCH && invert_search)) {
- if (find_match(haystack, needle, ignoreCase) == TRUE) {
- if (tellName == TRUE)
- printf("%s:", fileName);
+ /* if we found a match but were told to be quiet, stop here and
+ * return success */
+ if (be_quiet)
+ exit(0);
- if (tellLine == TRUE)
- printf("%ld:", line);
+ /* keep track of matches */
+ nmatches++;
- if (beQuiet == FALSE)
- fputs(haystack, stdout);
+ /* if we're just printing filenames, we stop after the first match */
+ if (print_files_with_matches)
+ break;
- match = TRUE;
- }
+ /* print the matched line */
+ if (print_match_counts == 0) {
+#ifdef BB_FEATURE_GREP_CONTEXT
+ int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
+
+ /* 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;
+
+ /* 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++;
+ }
+
+ /* 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++;
+ }
+ }
+
+ /* 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;
+ }
+ }
+
+ /* 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 */
+ } /* for */
+ free(line);
+ }
+
+
+ /* special-case file post-processing for options where we don't print line
+ * matches, just filenames and possibly match counts */
+
+ /* grep -c: print [filename:]count, even if count is zero */
+ if (print_match_counts) {
+ if (print_filename)
+ printf("%s:", cur_file);
+ if (print_files_with_matches && nmatches > 0)
+ printf("1\n");
+ else
+ printf("%d\n", nmatches);
}
+
+ /* grep -l: print just the filename, but only if we grepped the line in the file */
+ if (print_files_with_matches && nmatches > 0) {
+ puts(cur_file);
+ }
+
+
+ /* remember if we matched */
+ if (nmatches != 0)
+ matched = 1;
}
-extern int grep_main(int argc, char **argv)
+static void add_regex(const char *restr)
+{
+ regexes = xrealloc(regexes, sizeof(regex_t) * (++nregexes));
+ xregcomp(®exes[nregexes-1], restr, reflags);
+}
+
+
+static void load_regexes_from_file(const char *filename)
{
- 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) {
- usage(grep_usage);
+ char *line;
+ FILE *f = xfopen(filename, "r");
+ while ((line = get_line_from_file(f)) != NULL) {
+ chomp(line);
+ add_regex(line);
+ free(line);
}
+}
- if (**argv == '-') {
- argc--;
- cp = *argv++;
- while (*++cp)
- switch (*cp) {
+#ifdef BB_FEATURE_CLEAN_UP
+static void destroy_regexes()
+{
+ if (regexes == NULL)
+ return;
+
+ /* destroy all the elments in the array */
+ while (--nregexes >= 0) {
+ regfree(®exes[nregexes]);
+ free(®exes[nregexes]);
+ }
+}
+#endif
+
+
+extern int grep_main(int argc, char **argv)
+{
+ int opt;
+#ifdef BB_FEATURE_GREP_CONTEXT
+ char *junk;
+#endif
+
+#ifdef BB_FEATURE_CLEAN_UP
+ /* destroy command strings on exit */
+ if (atexit(destroy_regexes) == -1)
+ perror_msg_and_die("atexit");
+#endif
+
+ /* do normal option parsing */
+ while ((opt = getopt(argc, argv, "iHhlnqvsce:f:"
+#ifdef BB_FEATURE_GREP_CONTEXT
+"A:B:C:"
+#endif
+)) > 0) {
+ switch (opt) {
case 'i':
- ignoreCase = TRUE;
+ reflags |= REG_ICASE;
+ break;
+ case 'l':
+ print_files_with_matches++;
+ break;
+ case 'H':
+ print_filename++;
break;
-
case 'h':
- tellName = FALSE;
+ print_filename--;
break;
-
case 'n':
- tellLine = TRUE;
+ print_line_num++;
break;
-
case 'q':
- beQuiet = TRUE;
+ be_quiet++;
break;
-
+ case 'v':
+ invert_search++;
+ break;
+ case 's':
+ suppress_err_msgs++;
+ break;
+ case 'c':
+ print_match_counts++;
+ break;
+ case 'e':
+ add_regex(optarg);
+ break;
+ case 'f':
+ load_regexes_from_file(optarg);
+ 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 */
default:
- usage(grep_usage);
- }
+ show_usage();
+ }
}
- needle = *argv++;
- argc--;
-
- 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 we didn't get a pattern from a -e and no command file was specified,
+ * argv[optind] should be the pattern. no pattern, no worky */
+ if (nregexes == 0) {
+ if (argv[optind] == NULL)
+ show_usage();
+ else {
+ add_regex(argv[optind]);
+ optind++;
+ }
+ }
- do_grep(fp, needle, fileName, tellName, ignoreCase, tellLine);
+ /* sanity checks */
+ if (print_match_counts || be_quiet || print_files_with_matches) {
+ print_line_num = 0;
+#ifdef BB_FEATURE_GREP_CONTEXT
+ lines_before = 0;
+ lines_after = 0;
+#endif
+ }
+
+ /* argv[(optind)..(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) > 0)
+ print_filename++;
- if (ferror(fp))
- perror(fileName);
- fclose(fp);
+ /* If no files were specified, or '-' was specified, take input from
+ * stdin. Otherwise, we grep through all the files specified. */
+ if (argv[optind] == NULL || (strcmp(argv[optind], "-") == 0)) {
+ grep_file(stdin);
+ }
+ else {
+ int i;
+ FILE *file;
+ for (i = optind; 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);
+ }
}
}
- exit(match);
-}
-
-/* END CODE */
+ return !matched; /* invert return value 0 = success, 1 = failed */
+}
projects / oweals / busybox.git / blobdiff