/* vi: set sw=4 ts=4: *//* * Mini cmp implementation for busybox * * Copyright (C) 1999,2000,2001 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 <stdio.h>#include <string.h>#include <errno.h>#include <stdlib.h>#include <getopt.h>#include "busybox.h"int cmp_main(int argc, char **argv){	FILE *fp1 = NULL, *fp2 = stdin;	char *filename1, *filename2 = "-";	int c, c1, c2, char_pos = 1, line_pos = 1, silent = FALSE;	while ((c = getopt(argc, argv, "s")) != EOF) {		switch (c) {			case 's':				silent = TRUE;				break;			default:				show_usage();		}	}	filename1 = argv[optind];	switch (argc - optind) {		case 2:			fp2 = xfopen(filename2 = argv[optind + 1], "r");		case 1:			fp1 = xfopen(filename1, "r");			break;		default:			show_usage();	}	do {		c1 = fgetc(fp1);		c2 = fgetc(fp2);		if (c1 != c2) {			if (silent)				return EXIT_FAILURE;			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 EXIT_FAILURE;		}		char_pos++;		if (c1 == '\n')			line_pos++;	} while (c1 != EOF);	return EXIT_SUCCESS;}