1 /* $NetBSD: cmp.c,v 1.21 2021/03/20 14:27:47 cheusov 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 40 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94"; 41 #else 42 __RCSID("$NetBSD: cmp.c,v 1.21 2021/03/20 14:27:47 cheusov 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 60 int lflag, sflag; 61 62 __dead static void usage(void); 63 64 int 65 main(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 special = 0; 75 while ((ch = getopt(argc, argv, "cls")) != -1) 76 switch (ch) { 77 case 'c': 78 special = 1; /* careful! Don't use mmap() */ 79 break; 80 case 'l': /* print all differences */ 81 lflag = 1; 82 break; 83 case 's': /* silent run */ 84 sflag = 1; 85 break; 86 case '?': 87 default: 88 usage(); 89 } 90 argv += optind; 91 argc -= optind; 92 93 if (lflag && sflag) 94 errx(ERR_EXIT, "only one of -l and -s may be specified"); 95 96 if (argc < 2 || argc > 4) 97 usage(); 98 99 /* Backward compatibility -- handle "-" meaning stdin. */ 100 if (strcmp(file1 = argv[0], "-") == 0) { 101 special = 1; 102 fd1 = 0; 103 file1 = "stdin"; 104 } 105 else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { 106 if (!sflag) 107 warn("%s", file1); 108 exit(ERR_EXIT); 109 } 110 if (strcmp(file2 = argv[1], "-") == 0) { 111 if (special) 112 errx(ERR_EXIT, 113 "standard input may only be specified once"); 114 special = 1; 115 fd2 = 0; 116 file2 = "stdin"; 117 } 118 else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { 119 if (!sflag) 120 warn("%s", file2); 121 exit(ERR_EXIT); 122 } 123 124 if (argc > 2) { 125 char *ep; 126 127 errno = 0; 128 skip1 = (off_t)strtoll(argv[2], &ep, 0); 129 if (errno || ep == argv[2]) 130 usage(); 131 132 if (argc == 4) { 133 skip2 = (off_t)strtoll(argv[3], &ep, 0); 134 if (errno || ep == argv[3]) 135 usage(); 136 } 137 } 138 139 if (!special) { 140 if (fstat(fd1, &sb1)) 141 err(ERR_EXIT, "%s", file1); 142 if (!S_ISREG(sb1.st_mode)) 143 special = 1; 144 else { 145 if (fstat(fd2, &sb2)) 146 err(ERR_EXIT, "%s", file2); 147 if (!S_ISREG(sb2.st_mode)) 148 special = 1; 149 } 150 } 151 152 if (special) 153 c_special(fd1, file1, skip1, fd2, file2, skip2); 154 else 155 c_regular(fd1, file1, skip1, sb1.st_size, 156 fd2, file2, skip2, sb2.st_size); 157 exit(0); 158 } 159 160 static void 161 usage(void) 162 { 163 164 (void)fprintf(stderr, 165 "Usage: %s [-c] [-l | -s] file1 file2 [skip1 [skip2]]\n", 166 getprogname()); 167 exit(ERR_EXIT); 168 } 169