/* vi: set sw=4 ts=4: */
/*
- * Mini uniq implementation for busybox
+ * uniq implementation for busybox
*
+ * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
*
- * Copyright (C) 1999,2000,2001 by Lineo, inc.
- * Written by John Beppu <beppu@lineo.com>
- * Rewritten by Matt Kraai <kraai@alumni.carnegiemellon.edu>
- *
- * 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
- *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
-#include <stdio.h>
-#include <string.h>
-#include <getopt.h>
-#include <errno.h>
-#include <stdlib.h>
-#include "busybox.h"
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */
-static int print_count;
-static int print_uniq = 1;
-static int print_duplicates = 1;
+#include "libbb.h"
-static void print_line(char *line, int count, FILE *fp)
+static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
{
- if ((print_duplicates && count > 1) || (print_uniq && count == 1)) {
- if (print_count)
- fprintf(fp, "%7d\t%s", count, line);
- else
- fputs(line, fp);
+ const char *n;
+
+ n = *argv;
+ if (n != NULL) {
+ if ((*n != '-') || n[1]) {
+ return xfopen(n, "r\0w" + read0write2);
+ }
}
+ 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 = stdin, *out = stdout;
- char *lastline = NULL, *input;
- int opt, count = 0;
-
- /* parse argv[] */
- while ((opt = getopt(argc, argv, "cdu")) > 0) {
- switch (opt) {
- case 'c':
- print_count = 1;
- break;
- case 'd':
- print_duplicates = 1;
- print_uniq = 0;
- break;
- case 'u':
- print_duplicates = 0;
- print_uniq = 1;
- break;
- }
- }
+ FILE *in, *out;
+ const char *s0, *e0, *s1, *e1, *input_filename;
+ 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 = INT_MAX;
- if (argv[optind] != NULL) {
- in = xfopen(argv[optind], "r");
- if (argv[optind+1] != NULL)
- out = xfopen(argv[optind+1], "w");
+ opt_complementary = "f+:s+:w+";
+ opt = getopt32(argv, "cduf:s:w:", &skip_fields, &skip_chars, &max_chars);
+ argv += optind;
+
+ input_filename = *argv;
+
+ in = xgetoptfile_uniq_s(argv, 0);
+ if (*argv) {
+ ++argv;
+ }
+ out = xgetoptfile_uniq_s(argv, 2);
+ if (*argv && argv[1]) {
+ bb_show_usage();
}
- while ((input = get_line_from_file(in)) != NULL) {
- if (lastline == NULL || strcmp(input, lastline) != 0) {
- print_line(lastline, count, out);
- free(lastline);
- lastline = input;
- count = 0;
+ s1 = e1 = NULL; /* prime the pump */
+
+ 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. */
}
- count++;
- }
- print_line(lastline, count, out);
- free(lastline);
- return EXIT_SUCCESS;
+ if (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);
+
+ die_if_ferror(in, input_filename);
+
+ fflush_stdout_and_exit(EXIT_SUCCESS);
}