1 /* $NetBSD: cmp.c,v 1.8 1996/02/01 03:32:41 mrg 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1987, 1990, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94"; 45 #else 46 static char rcsid[] = "$NetBSD: cmp.c,v 1.8 1996/02/01 03:32:41 mrg Exp $"; 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/types.h> 51 #include <sys/stat.h> 52 53 #include <err.h> 54 #include <fcntl.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 #include <locale.h> 60 61 #include "extern.h" 62 63 int lflag, sflag; 64 65 static void usage __P((void)); 66 67 int 68 main(argc, argv) 69 int argc; 70 char *argv[]; 71 { 72 struct stat sb1, sb2; 73 off_t skip1, skip2; 74 int ch, fd1, fd2, special; 75 char *file1, *file2; 76 77 setlocale(LC_ALL, ""); 78 79 while ((ch = getopt(argc, argv, "ls")) != EOF) 80 switch (ch) { 81 case 'l': /* print all differences */ 82 lflag = 1; 83 break; 84 case 's': /* silent run */ 85 sflag = 1; 86 break; 87 case '?': 88 default: 89 usage(); 90 } 91 endargs: 92 argv += optind; 93 argc -= optind; 94 95 if (lflag && sflag) 96 errx(ERR_EXIT, "only one of -l and -s may be specified"); 97 98 if (argc < 2 || argc > 4) 99 usage(); 100 101 /* Backward compatibility -- handle "-" meaning stdin. */ 102 special = 0; 103 if (strcmp(file1 = argv[0], "-") == 0) { 104 special = 1; 105 fd1 = 0; 106 file1 = "stdin"; 107 } 108 else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { 109 if (!sflag) 110 warn("%s", file1); 111 exit(ERR_EXIT); 112 } 113 if (strcmp(file2 = argv[1], "-") == 0) { 114 if (special) 115 errx(ERR_EXIT, 116 "standard input may only be specified once"); 117 special = 1; 118 fd2 = 0; 119 file2 = "stdin"; 120 } 121 else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { 122 if (!sflag) 123 warn("%s", file2); 124 exit(ERR_EXIT); 125 } 126 127 skip1 = argc > 2 ? strtoq(argv[2], NULL, 10) : 0; 128 skip2 = argc == 4 ? strtoq(argv[3], NULL, 10) : 0; 129 130 if (!special) { 131 if (fstat(fd1, &sb1)) 132 err(ERR_EXIT, "%s", file1); 133 if (!S_ISREG(sb1.st_mode)) 134 special = 1; 135 else { 136 if (fstat(fd2, &sb2)) 137 err(ERR_EXIT, "%s", file2); 138 if (!S_ISREG(sb2.st_mode)) 139 special = 1; 140 } 141 } 142 143 if (special) 144 c_special(fd1, file1, skip1, fd2, file2, skip2); 145 else 146 c_regular(fd1, file1, skip1, sb1.st_size, 147 fd2, file2, skip2, sb2.st_size); 148 exit(0); 149 } 150 151 static void 152 usage() 153 { 154 155 (void)fprintf(stderr, 156 "usage: cmp [-l | s] file1 file2 [skip1 [skip2]]\n"); 157 exit(ERR_EXIT); 158 } 159