/*
* uniq implementation for busybox
*
- * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
+ * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
*
- * Licensed under GPL v2, see file LICENSE in this tarball for details.
+ * 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 "busybox.h"
#include "libcoreutils/coreutils.h"
-/* The extra data is flags to make -d and -u switch each other off */
-static const char uniq_opts[] = "cudf:s:\0\7\3\5\1\2\4";
-
-#define SHOW_COUNT 1
-#define SHOW_UNIQUE 2
-#define SHOW_DUPLICATE 4
+static const char uniq_opts[] = "f:s:" "cdu\0\1\2\4";
-static FILE *open_arg(char **argv, char *mode)
+static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
{
- char *n=*argv;
+ const char *n;
- return (n && *n != '-' && n[1]) ? bb_xfopen(n, mode) :
- *mode=='r' ? stdin : stdout;
+ if ((n = *argv) != NULL) {
+ if ((*n != '-') || n[1]) {
+ return bb_xfopen(n, "r\0w" + read0write2);
+ }
+ }
+ return (read0write2) ? stdout : stdin;
}
-
int uniq_main(int argc, char **argv)
{
FILE *in, *out;
- unsigned long dups, skip_fields, skip_chars, i;
- const char *oldline, *oldskipped, *line, *skipped, *input_filename;
+ unsigned long dups, skip_fields, skip_chars, i, uniq_flags;
+ const char *s0, *e0, *s1, *e1, *input_filename;
int opt;
- int uniq_flags = SHOW_UNIQUE | SHOW_DUPLICATE;
- skip_fields = skip_chars = 0;
+ uniq_flags = skip_fields = skip_chars = 0;
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);
-
- /* This bit uses the extra data at the end of uniq_opts to make
- * -d and -u switch each other off in a very small amount of space */
-
- else if ((line = strchr(uniq_opts, opt)) != NULL) {
- uniq_flags &= line[8];
- uniq_flags |= line[11];
- } else bb_show_usage();
+ if ((opt == 'f') || (opt == 's')) {
+ int t = bb_xgetularg10(optarg);
+ if (opt == 'f') {
+ skip_fields = t;
+ } else {
+ skip_chars = t;
+ }
+ } else if ((s0 = strchr(uniq_opts, opt)) != NULL) {
+ uniq_flags |= s0[4];
+ } else {
+ bb_show_usage();
+ }
}
input_filename = *(argv += optind);
- in = open_arg(argv, "r");
- if (*argv) ++argv;
- out = open_arg(argv, "w");
- if (*argv && argv[1]) bb_show_usage();
-
- line = skipped = NULL;
-
-NOT_DUPLICATE:
- oldline = line;
- oldskipped = skipped;
- dups = 0;
-
- /* gnu uniq ignores newlines */
- while ((line = bb_get_chomped_line_from_file(in)) != NULL) {
- skipped = line;
- for (i=skip_fields ; i ; i--) {
- skipped = bb_skip_whitespace(skipped);
- while (*skipped && !isspace(*skipped)) ++skipped;
- }
- for (i = skip_chars ; *skipped && i ; i--) ++skipped;
- if (oldline) {
- if (!strcmp(oldskipped, skipped)) {
- ++dups; /* Note: Testing for overflow seems excessive. */
- continue;
+ in = xgetoptfile_uniq_s(argv, 0);
+ if (*argv) {
+ ++argv;
+ }
+ out = xgetoptfile_uniq_s(argv, 2);
+ if (*argv && argv[1]) {
+ bb_show_usage();
+ }
+
+ s1 = e1 = NULL; /* prime the pump */
+
+ do {
+ s0 = s1;
+ e0 = e1;
+ dups = 0;
+
+ /* 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;
+ }
}
-DO_LAST:
- if (uniq_flags & (dups ? SHOW_DUPLICATE : SHOW_UNIQUE)) {
- bb_fprintf(out, "\0%7d " + (uniq_flags & SHOW_COUNT), dups + 1);
- bb_fprintf(out, "%s\n", oldline);
+ for (i = skip_chars ; *e1 && i ; i--) {
+ ++e1;
+ }
+
+ if (!s0 || strcmp(e0, e1)) {
+ break;
}
- free((void *)oldline);
+
+ ++dups; /* Note: Testing for overflow seems excessive. */
}
- goto NOT_DUPLICATE;
- }
- if (oldline) goto DO_LAST;
+ if (s0) {
+ if (!(uniq_flags & (2 << !!dups))) {
+ bb_fprintf(out, "\0%d " + (uniq_flags & 1), dups + 1);
+ bb_fprintf(out, "%s\n", s0);
+ }
+ free((void *)s0);
+ }
+ } while (s1);
bb_xferror(in, input_filename);
projects / oweals / busybox.git / blobdiff