| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini 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> |
| * |
| * 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 <stdio.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| int uniq_main(int argc, char **argv) |
| { |
| FILE *in = stdin, *out = stdout; |
| char *lastline = NULL, *input; |
| |
| /* parse argv[] */ |
| if ((argc > 1 && **(argv + 1) == '-') || argc > 3) |
| usage(uniq_usage); |
| |
| if (argv[1] != NULL) { |
| in = xfopen(argv[1], "r"); |
| if (argv[2] != NULL) |
| out = xfopen(argv[2], "w"); |
| } |
| |
| while ((input = get_line_from_file(in)) != NULL) { |
| if (lastline == NULL || strcmp(input, lastline) != 0) { |
| fputs(input, out); |
| free(lastline); |
| lastline = input; |
| } |
| } |
| free(lastline); |
| |
| return EXIT_SUCCESS; |
| } |