1 /* vi: set sw=4 ts=4: */
3 * Mini uniq implementation for busybox
6 * Copyright (C) 1999,2000 by Lineo, inc.
7 * Written by John Beppu <beppu@lineo.com>
8 * Rewritten by Matt Kraai <kraai@alumni.carnegiemellon.edu>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 int uniq_main(int argc, char **argv)
33 FILE *in = stdin, *out = stdout;
34 char *lastline = NULL, *input;
37 if ((argc > 1 && **(argv + 1) == '-') || argc > 3)
40 if (argv[1] != NULL) {
41 in = xfopen(argv[1], "r");
43 out = xfopen(argv[2], "w");
46 while ((input = get_line_from_file(in)) != NULL) {
47 if (lastline == NULL || strcmp(input, lastline) != 0) {