/*
* uniq implementation for busybox
*
- * 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
- * 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
+ * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
*
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <unistd.h>
-#include "busybox.h"
-#include "libcoreutils/coreutils.h"
+#include "libbb.h"
-static const char uniq_opts[] = "f:s:cdu\0\7\3\5\1\2\4";
-
-static FILE *xgetoptfile_sort_uniq_s(char **argv, const char *mode)
+static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
{
const char *n;
- if ((n = *argv) != NULL) {
+ n = *argv;
+ if (n != NULL) {
if ((*n != '-') || n[1]) {
- return bb_xfopen(n, mode);
+ return xfopen(n, "r\0w" + read0write2);
}
}
- return (*mode == 'r') ? stdin : stdout;
+ return (read0write2) ? stdout : stdin;
}
-int uniq_main(int argc, char **argv)
+int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int uniq_main(int argc UNUSED_PARAM, char **argv)
{
FILE *in, *out;
- /* Note: Ignore the warning about dups and e0 being used uninitialized.
- * They will be initialized on the fist pass of the loop (since s0 is NULL). */
-#warning The dups and e0 warnings are OK, ignore them
- unsigned long dups, skip_fields, skip_chars, i;
const char *s0, *e0, *s1, *e1, *input_filename;
- int opt;
- int uniq_flags = 6; /* -u */
+ unsigned long dups;
+ unsigned skip_fields, skip_chars, max_chars;
+ unsigned opt;
+ unsigned i;
+
+ enum {
+ OPT_c = 0x1,
+ OPT_d = 0x2,
+ OPT_u = 0x4,
+ OPT_f = 0x8,
+ OPT_s = 0x10,
+ OPT_w = 0x20,
+ };
skip_fields = skip_chars = 0;
+ max_chars = -1;
- 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();
- }
- }
+ opt_complementary = "f+:s+:w+";
+ opt = getopt32(argv, "cduf:s:w:", &skip_fields, &skip_chars, &max_chars);
+ argv += optind;
- input_filename = *(argv += optind);
+ input_filename = *argv;
- in = xgetoptfile_sort_uniq_s(argv, "r");
+ in = xgetoptfile_uniq_s(argv, 0);
if (*argv) {
++argv;
}
- out = xgetoptfile_sort_uniq_s(argv, "w");
+ out = xgetoptfile_uniq_s(argv, 2);
if (*argv && argv[1]) {
bb_show_usage();
}
- s0 = NULL;
+ s1 = e1 = NULL; /* prime the pump */
- /* 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)) {
+ do {
+ s0 = s1;
+ e0 = e1;
+ dups = 0;
+
+ /* gnu uniq ignores newlines */
+ while ((s1 = xmalloc_fgetline(in)) != NULL) {
+ e1 = s1;
+ for (i = skip_fields; i; i--) {
+ e1 = skip_whitespace(e1);
+ e1 = skip_non_whitespace(e1);
+ }
+ for (i = skip_chars; *e1 && i; i--) {
++e1;
}
+
+ if (!s0 || strncmp(e0, e1, max_chars)) {
+ break;
+ }
+
+ ++dups; /* note: testing for overflow seems excessive. */
}
- 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);
+ if (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_e) */
+ fprintf(out, "\0%ld " + (opt & 1), dups + 1); /* 1 == OPT_c */
+ fprintf(out, "%s\n", s0);
}
free((void *)s0);
}
+ } while (s1);
- s0 = s1;
- e0 = e1;
- dups = 0;
- }
-
- if (s0) {
- e1 = NULL;
- goto DO_LAST;
- }
-
- bb_xferror(in, input_filename);
+ die_if_ferror(in, input_filename);
- bb_fflush_stdout_and_exit(EXIT_SUCCESS);
+ fflush_stdout_and_exit(EXIT_SUCCESS);
}
projects / oweals / busybox.git / blobdiff