1 /* $OpenBSD: cmp.c,v 1.8 1999/08/03 16:02:44 mickey 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1987, 1990, 1993, 1994\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94"; 46 #else 47 static char rcsid[] = "$OpenBSD: cmp.c,v 1.8 1999/08/03 16:02:44 mickey Exp $"; 48 #endif 49 #endif /* not lint */ 50 51 #include <sys/types.h> 52 #include <sys/stat.h> 53 54 #include <err.h> 55 #include <fcntl.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 #include <locale.h> 61 62 #include "extern.h" 63 64 int lflag, sflag; 65 66 static void usage __P((void)); 67 68 int 69 main(argc, argv) 70 int argc; 71 char *argv[]; 72 { 73 struct stat sb1, sb2; 74 off_t skip1, skip2; 75 int ch, fd1, fd2, special; 76 char *file1, *file2; 77 78 setlocale(LC_ALL, ""); 79 80 while ((ch = getopt(argc, argv, "ls")) != -1) 81 switch (ch) { 82 case 'l': /* print all differences */ 83 lflag = 1; 84 break; 85 case 's': /* silent run */ 86 sflag = 1; 87 break; 88 case '?': 89 default: 90 usage(); 91 } 92 93 argv += optind; 94 argc -= optind; 95 96 if (lflag && sflag) 97 errx(ERR_EXIT, "only one of -l and -s may be specified"); 98 99 if (argc < 2 || argc > 4) 100 usage(); 101 102 /* Backward compatibility -- handle "-" meaning stdin. */ 103 special = 0; 104 if (strcmp(file1 = argv[0], "-") == 0) { 105 special = 1; 106 fd1 = 0; 107 file1 = "stdin"; 108 } 109 else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { 110 if (sflag) 111 exit(ERR_EXIT); 112 else 113 err(ERR_EXIT, "%s", file1); 114 } 115 if (strcmp(file2 = argv[1], "-") == 0) { 116 if (special) { 117 if (sflag) 118 exit(ERR_EXIT); 119 else 120 errx(ERR_EXIT, 121 "standard input may only be specified once"); 122 } 123 special = 1; 124 fd2 = 0; 125 file2 = "stdin"; 126 } 127 else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { 128 if (sflag) 129 exit(ERR_EXIT); 130 else 131 err(ERR_EXIT, "%s", file2); 132 } 133 134 skip1 = argc > 2 ? strtoq(argv[2], NULL, 0) : 0; 135 skip2 = argc == 4 ? strtoq(argv[3], NULL, 0) : 0; 136 137 if (!special) { 138 if (fstat(fd1, &sb1)) { 139 if (sflag) 140 exit(ERR_EXIT); 141 else 142 err(ERR_EXIT, "%s", file1); 143 } 144 if (!S_ISREG(sb1.st_mode)) 145 special = 1; 146 else { 147 if (fstat(fd2, &sb2)) { 148 if (sflag) 149 exit(ERR_EXIT); 150 else 151 err(ERR_EXIT, "%s", file2); 152 } 153 if (!S_ISREG(sb2.st_mode)) 154 special = 1; 155 } 156 } 157 158 if (special) 159 c_special(fd1, file1, skip1, fd2, file2, skip2); 160 else 161 c_regular(fd1, file1, skip1, sb1.st_size, 162 fd2, file2, skip2, sb2.st_size); 163 return 0; 164 } 165 166 static void 167 usage() 168 { 169 170 (void)fprintf(stderr, 171 "usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n"); 172 exit(ERR_EXIT); 173 } 174