1 /* $OpenBSD: cmp.c,v 1.11 2003/06/10 22:20:45 deraadt Exp $ */ 2 /* $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $ */ 3 4 /* 5 * Copyright (c) 1987, 1990, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static char copyright[] = 35 "@(#) Copyright (c) 1987, 1990, 1993, 1994\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94"; 42 #else 43 static char rcsid[] = "$OpenBSD: cmp.c,v 1.11 2003/06/10 22:20:45 deraadt Exp $"; 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/types.h> 48 #include <sys/stat.h> 49 50 #include <err.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 60 int lflag, sflag; 61 62 static void usage(void); 63 64 int 65 main(int argc, char *argv[]) 66 { 67 struct stat sb1, sb2; 68 off_t skip1, skip2; 69 int ch, fd1, fd2, special; 70 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 87 argv += optind; 88 argc -= optind; 89 90 if (lflag && sflag) 91 errx(ERR_EXIT, "only one of -l and -s may be specified"); 92 93 if (argc < 2 || argc > 4) 94 usage(); 95 96 /* Backward compatibility -- handle "-" meaning stdin. */ 97 special = 0; 98 if (strcmp(file1 = argv[0], "-") == 0) { 99 special = 1; 100 fd1 = 0; 101 file1 = "stdin"; 102 } else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { 103 if (sflag) 104 exit(ERR_EXIT); 105 else 106 err(ERR_EXIT, "%s", file1); 107 } 108 if (strcmp(file2 = argv[1], "-") == 0) { 109 if (special) { 110 if (sflag) 111 exit(ERR_EXIT); 112 else 113 errx(ERR_EXIT, 114 "standard input may only be specified once"); 115 } 116 special = 1; 117 fd2 = 0; 118 file2 = "stdin"; 119 } else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { 120 if (sflag) 121 exit(ERR_EXIT); 122 else 123 err(ERR_EXIT, "%s", file2); 124 } 125 126 skip1 = argc > 2 ? strtoq(argv[2], NULL, 0) : 0; 127 skip2 = argc == 4 ? strtoq(argv[3], NULL, 0) : 0; 128 129 if (!special) { 130 if (fstat(fd1, &sb1)) { 131 if (sflag) 132 exit(ERR_EXIT); 133 else 134 err(ERR_EXIT, "%s", file1); 135 } 136 if (!S_ISREG(sb1.st_mode)) 137 special = 1; 138 else { 139 if (fstat(fd2, &sb2)) { 140 if (sflag) 141 exit(ERR_EXIT); 142 else 143 err(ERR_EXIT, "%s", file2); 144 } 145 if (!S_ISREG(sb2.st_mode)) 146 special = 1; 147 } 148 } 149 150 if (special) 151 c_special(fd1, file1, skip1, fd2, file2, skip2); 152 else 153 c_regular(fd1, file1, skip1, sb1.st_size, 154 fd2, file2, skip2, sb2.st_size); 155 return 0; 156 } 157 158 static void 159 usage(void) 160 { 161 162 (void)fprintf(stderr, 163 "usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n"); 164 exit(ERR_EXIT); 165 } 166