/*
- * 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 by Lineo, inc.
+ * Written by Mark Whitley <markw@lineo.com>, <markw@enol.com>
*
* 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 "regexp.h"
#include <stdio.h>
-#include <dirent.h>
+#include <stdlib.h>
+#include <unistd.h> /* for getopt() */
+#include <regex.h>
+#include <string.h> /* for strerror() */
#include <errno.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-#include <ctype.h>
+#include "internal.h"
+
+extern int optind; /* in unistd.h */
+extern int errno; /* for use with strerror() */
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";
+ "grep [-ihHnqvs] pattern [files...]\n"
+#ifndef BB_FEATURE_TRIVIAL_HELP
+ "\nSearch for PATTERN in each FILE or standard input.\n\n"
+ "Options:\n"
+ "\t-H\tprefix output lines with filename where match was found\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"
+ "\t-v\tselect non-matching lines\n"
+ "\t-s\tsuppress file open/read error messages\n\n"
#endif
+ ;
+
+/* options */
+static int ignore_case = 0;
+static int print_filename = 0;
+static int print_line_num = 0;
+static int be_quiet = 0;
+static int invert_search = 0;
+static int suppress_err_msgs = 0;
+/* globals */
+static regex_t regex; /* storage space for compiled regular expression */
+static int nmatches = 0; /* keeps track of the number of matches */
+static char *cur_file = NULL; /* the current file we are reading */
+
+
+static void print_matched_line(char *line, int linenum)
+{
+ if (print_filename)
+ printf("%s:", cur_file);
+ if (print_line_num)
+ printf("%i:", linenum);
+
+ printf("%s", line);
+}
-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;
- while (fgets (haystack, sizeof (haystack), fp)) {
- line++;
- cp = &haystack[strlen (haystack) - 1];
+ while ((line = get_line_from_file(file)) != NULL) {
+ linenum++;
+ ret = regexec(®ex, line, 0, NULL, 0);
+ if (ret == 0 && !invert_search) { /* match */
- if (*cp != '\n')
- fprintf (stderr, "%s: Line too long\n", fileName);
+ /* if we found a match but were told to be quiet, stop here and
+ * return success */
+ if (be_quiet) {
+ regfree(®ex);
+ exit(0);
+ }
- if (find_match(haystack, needle, ignoreCase) == TRUE) {
- if (tellName==TRUE)
- printf ("%s:", fileName);
+ nmatches++;
- if (tellLine==TRUE)
- printf ("%ld:", line);
+ print_matched_line(line, linenum);
- fputs (haystack, stdout);
+ } else if (ret == REG_NOMATCH && invert_search) {
+ print_matched_line(line, linenum);
+ }
+
+ free(line);
}
- }
}
-
-extern int grep_main (int argc, char **argv)
+extern int grep_main(int argc, char **argv)
{
- FILE *fp;
- char *cp;
- char *needle;
- char *fileName;
- int tellName=FALSE;
- int ignoreCase=FALSE;
- int tellLine=FALSE;
-
-
- 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 = TRUE;
- break;
-
- case 'n':
- tellLine = TRUE;
- break;
-
- default:
- usage(grep_usage);
- }
- }
+ int opt;
+ int reflags;
+ int ret;
- needle = *argv++;
- argc--;
-
- if (argc==0) {
- do_grep( stdin, needle, "stdin", FALSE, ignoreCase, tellLine);
- } else {
- while (argc-- > 0) {
- fileName = *argv++;
+ /* do special-case option parsing */
+ if (argv[1] && (strcmp(argv[1], "--help") == 0))
+ usage(grep_usage);
- fp = fopen (fileName, "r");
- if (fp == NULL) {
- perror (fileName);
- continue;
- }
+ /* do normal option parsing */
+ while ((opt = getopt(argc, argv, "iHhnqvs")) > 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;
+ }
+ }
- do_grep( fp, needle, fileName, tellName, ignoreCase, tellLine);
+ /* argv[optind] should be the regex pattern; no pattern, no worky */
+ if (argv[optind] == NULL)
+ usage(grep_usage);
- if (ferror (fp))
- perror (fileName);
- fclose (fp);
+ /* compile the regular expression */
+ reflags = REG_NOSUB; /* we're not going to mess with sub-expressions */
+ if (ignore_case)
+ reflags |= REG_ICASE;
+ if ((ret = regcomp(®ex, argv[optind], reflags)) != 0) {
+ int errmsgsz = regerror(ret, ®ex, NULL, 0);
+ char *errmsg = malloc(errmsgsz);
+ if (errmsg == NULL) {
+ fprintf(stderr, "grep: memory error\n");
+ regfree(®ex);
+ exit(1);
+ }
+ regerror(ret, ®ex, errmsg, errmsgsz);
+ fprintf(stderr, "grep: %s\n", errmsg);
+ free(errmsg);
+ regfree(®ex);
+ exit(1);
}
- }
- exit( TRUE);
-}
+ /* 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++;
+
+ /* 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)
+ fprintf(stderr, "grep: %s: %s\n", cur_file, strerror(errno));
+ } else {
+ grep_file(file);
+ fclose(file);
+ }
+ }
+ }
-/* END CODE */
+ regfree(®ex);
+ if (nmatches == 0)
+ return 1;
+ return 0;
+}
projects / oweals / busybox.git / blobdiff