/* vi: set sw=4 ts=4: */
/*
- * Mini uniq implementation for busybox
+ * uniq implementation for busybox
*
- *
- * Copyright (C) 1999,2000 by Lineo, inc.
- * Written by John Beppu <beppu@lineo.com>
- * Rewritten by Matt Kraai <kraai@alumni.carnegiemellon.edu>
+ * Copyright (C) 2003 Manuel Novoa III <mjn3@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 "busybox.h"
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
+
#include <stdio.h>
+#include <stdlib.h>
#include <string.h>
-#include <errno.h>
+#include <ctype.h>
+#include <unistd.h>
+#include "busybox.h"
+#include "libcoreutils/coreutils.h"
+
+static const char uniq_opts[] = "f:s:cdu\0\7\3\5\1\2\4";
int uniq_main(int argc, char **argv)
{
- FILE *in = stdin, *out = stdout;
- char *lastline = NULL, *input;
+ FILE *in, *out;
+ /* Note: Ignore the warning about dups and e0 possibly being uninitialized.
+ * They will be initialized on the fist pass of the loop (since s0 is NULL). */
+ unsigned long dups, skip_fields, skip_chars, i;
+ const char *s0, *e0, *s1, *e1, *input_filename;
+ int opt;
+ int uniq_flags = 6; /* -u */
- /* parse argv[] */
- if ((argc > 1 && **(argv + 1) == '-') || argc > 3)
- usage(uniq_usage);
+ skip_fields = skip_chars = 0;
- if (argv[1] != NULL) {
- in = xfopen(argv[1], "r");
- if (argv[2] != NULL)
- out = xfopen(argv[2], "w");
+ while ((opt = getopt(argc, argv, uniq_opts)) > 0) {
+ if (opt == 'f') {
+ skip_fields = bb_xgetularg10(optarg);
+ } else if (opt == 's') {
+ skip_chars = bb_xgetularg10(optarg);
+ } else if ((s0 = strchr(uniq_opts, opt)) != NULL) {
+ uniq_flags &= s0[4];
+ uniq_flags |= s0[7];
+ } else {
+ bb_show_usage();
+ }
}
- while ((input = get_line_from_file(in)) != NULL) {
- if (lastline == NULL || strcmp(input, lastline) != 0) {
- fputs(input, out);
- free(lastline);
- lastline = input;
+ input_filename = *(argv += optind);
+
+ in = xgetoptfile_sort_uniq(argv, "r");
+ if (*argv) {
+ ++argv;
+ }
+ out = xgetoptfile_sort_uniq(argv, "w");
+ if (*argv && argv[1]) {
+ bb_show_usage();
+ }
+
+ s0 = NULL;
+
+ /* gnu uniq ignores newlines */
+ while ((s1 = bb_get_chomped_line_from_file(in)) != NULL) {
+ e1 = s1;
+ for (i=skip_fields ; i ; i--) {
+ e1 = bb_skip_whitespace(e1);
+ while (*e1 && !isspace(*e1)) {
+ ++e1;
+ }
+ }
+ for (i = skip_chars ; *e1 && i ; i--) {
+ ++e1;
+ }
+ if (s0) {
+ if (strcmp(e0, e1) == 0) {
+ ++dups; /* Note: Testing for overflow seems excessive. */
+ continue;
+ }
+ DO_LAST:
+ if ((dups && (uniq_flags & 2)) || (!dups && (uniq_flags & 4))) {
+ bb_fprintf(out, "\0%7d\t" + (uniq_flags & 1), dups + 1);
+ bb_fprintf(out, "%s\n", s0);
+ }
+ free((void *)s0);
}
+
+ s0 = s1;
+ e0 = e1;
+ dups = 0;
+ }
+
+ if (s0) {
+ e1 = NULL;
+ goto DO_LAST;
}
- free(lastline);
- return EXIT_SUCCESS;
+ bb_xferror(in, input_filename);
+
+ bb_fflush_stdout_and_exit(EXIT_SUCCESS);
}