1/* $NetBSD: cmp.c,v 1.17 2009/04/11 12:16:12 lukem Exp $ */ 2 3/* 4 * Copyright (c) 1987, 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32#include <sys/cdefs.h> 33#ifndef lint 34__COPYRIGHT("@(#) Copyright (c) 1987, 1990, 1993, 1994\ 35 The Regents of the University of California. All rights reserved."); 36#endif /* not lint */ 37 38#ifndef lint 39#if 0 40static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94"; 41#else 42__RCSID("$NetBSD: cmp.c,v 1.17 2009/04/11 12:16:12 lukem Exp $"); 43#endif 44#endif /* not lint */ 45 46#include <sys/types.h> 47#include <sys/stat.h> 48 49#include <err.h> 50#include <errno.h> 51#include <fcntl.h> 52#include <stdio.h> 53#include <stdlib.h> 54#include <string.h> 55#include <unistd.h> 56#include <locale.h> 57 58#include "extern.h" 59 60int lflag, sflag; 61 62__dead static void usage(void); 63 64int 65main(int argc, char *argv[]) 66{ 67 struct stat sb1, sb2; 68 off_t skip1 = 0, skip2 = 0; 69 int ch, fd1, fd2, special; 70 const char *file1, *file2; 71 72 setlocale(LC_ALL, ""); 73 74 while ((ch = getopt(argc, argv, "ls")) != -1) 75 switch (ch) { 76 case 'l': /* print all differences */ 77 lflag = 1; 78 break; 79 case 's': /* silent run */ 80 sflag = 1; 81 break; 82 case '?': 83 default: 84 usage(); 85 } 86 argv += optind; 87 argc -= optind; 88 89 if (lflag && sflag) 90 errx(ERR_EXIT, "only one of -l and -s may be specified"); 91 92 if (argc < 2 || argc > 4) 93 usage(); 94 95 /* Backward compatibility -- handle "-" meaning stdin. */ 96 special = 0; 97 if (strcmp(file1 = argv[0], "-") == 0) { 98 special = 1; 99 fd1 = 0; 100 file1 = "stdin"; 101 } 102 else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { 103 if (!sflag) 104 warn("%s", file1); 105 exit(ERR_EXIT); 106 } 107 if (strcmp(file2 = argv[1], "-") == 0) { 108 if (special) 109 errx(ERR_EXIT, 110 "standard input may only be specified once"); 111 special = 1; 112 fd2 = 0; 113 file2 = "stdin"; 114 } 115 else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { 116 if (!sflag) 117 warn("%s", file2); 118 exit(ERR_EXIT); 119 } 120 121 if (argc > 2) { 122 char *ep; 123 124 errno = 0; 125 skip1 = strtoq(argv[2], &ep, 0); 126 if (errno || ep == argv[2]) 127 usage(); 128 129 if (argc == 4) { 130 skip2 = strtoq(argv[3], &ep, 0); 131 if (errno || ep == argv[3]) 132 usage(); 133 } 134 } 135 136 if (!special) { 137 if (fstat(fd1, &sb1)) 138 err(ERR_EXIT, "%s", file1); 139 if (!S_ISREG(sb1.st_mode)) 140 special = 1; 141 else { 142 if (fstat(fd2, &sb2)) 143 err(ERR_EXIT, "%s", file2); 144 if (!S_ISREG(sb2.st_mode)) 145 special = 1; 146 } 147 } 148 149 if (special) 150 c_special(fd1, file1, skip1, fd2, file2, skip2); 151 else 152 c_regular(fd1, file1, skip1, sb1.st_size, 153 fd2, file2, skip2, sb2.st_size); 154 exit(0); 155} 156 157static void 158usage(void) 159{ 160 161 (void)fprintf(stderr, 162 "usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n"); 163 exit(ERR_EXIT); 164} 165