diff options
Diffstat (limited to 'cmp.c')
| -rw-r--r-- | cmp.c | 65 |
1 files changed, 65 insertions, 0 deletions
@@ -0,0 +1,65 @@ +/* vi: set sw=4 ts=4: */ +/* + * Mini cmp implementation for busybox + * + * + * Copyright (C) 2000 by Lineo, inc. + * Written 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 cmp_main(int argc, char **argv) +{ + FILE *fp1 = NULL, *fp2 = stdin; + char *filename1 = argv[1], *filename2 = "-"; + int c1, c2, char_pos = 1, line_pos = 1; + + /* parse argv[] */ + if (argc < 2 || 3 < argc) + usage(cmp_usage); + + fp1 = xfopen(argv[1], "r"); + if (argv[2] != NULL) { + fp2 = xfopen(argv[2], "r"); + filename2 = argv[2]; + } + + do { + c1 = fgetc(fp1); + c2 = fgetc(fp2); + if (c1 != c2) { + if (c1 == EOF) + printf("EOF on %s\n", filename1); + else if (c2 == EOF) + printf("EOF on %s\n", filename2); + else + printf("%s %s differ: char %d, line %d\n", filename1, filename2, + char_pos, line_pos); + return 1; + } + char_pos++; + if (c1 == '\n') + line_pos++; + } while (c1 != EOF); + + return EXIT_SUCCESS; +} |