1 /* 2 * Copyright (c) 1987, 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/usr.bin/cmp/cmp.c,v 1.6.6.4 2001/11/21 10:47:54 dwmalone Exp $ 30 * $DragonFly: src/usr.bin/cmp/cmp.c,v 1.3 2003/10/02 17:42:27 hmp Exp $ 31 * 32 * @(#) Copyright (c) 1987, 1990, 1993, 1994 The Regents of the University of California. All rights reserved. 33 * @(#)cmp.c 8.3 (Berkeley) 4/2/94 34 */ 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 39 #include <err.h> 40 #include <fcntl.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 #include "extern.h" 47 48 int lflag, sflag, xflag, zflag; 49 50 static void usage (void); 51 52 int 53 main(int argc, char **argv) 54 { 55 struct stat sb1, sb2; 56 off_t skip1, skip2; 57 int ch, fd1, fd2, special; 58 const char *file1, *file2; 59 60 while ((ch = getopt(argc, argv, "-lsxz")) != -1) 61 switch (ch) { 62 case 'l': /* print all differences */ 63 lflag = 1; 64 break; 65 case 's': /* silent run */ 66 sflag = 1; 67 zflag = 1; 68 break; 69 case 'x': /* hex output */ 70 lflag = 1; 71 xflag = 1; 72 break; 73 case 'z': /* compare size first */ 74 zflag = 1; 75 break; 76 case '-': /* stdin (must be after options) */ 77 --optind; 78 goto endargs; 79 case '?': 80 default: 81 usage(); 82 } 83 endargs: 84 argv += optind; 85 argc -= optind; 86 87 if (lflag && sflag) 88 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted"); 89 90 if (argc < 2 || argc > 4) 91 usage(); 92 93 /* Backward compatibility -- handle "-" meaning stdin. */ 94 special = 0; 95 if (strcmp(file1 = argv[0], "-") == 0) { 96 special = 1; 97 fd1 = 0; 98 file1 = "stdin"; 99 } 100 else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { 101 if (!sflag) 102 err(ERR_EXIT, "%s", file1); 103 else 104 exit(1); 105 } 106 if (strcmp(file2 = argv[1], "-") == 0) { 107 if (special) 108 errx(ERR_EXIT, 109 "standard input may only be specified once"); 110 special = 1; 111 fd2 = 0; 112 file2 = "stdin"; 113 } 114 else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { 115 if (!sflag) 116 err(ERR_EXIT, "%s", file2); 117 else 118 exit(1); 119 } 120 121 skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0; 122 skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0; 123 124 if (!special) { 125 if (fstat(fd1, &sb1)) { 126 if (!sflag) 127 err(ERR_EXIT, "%s", file1); 128 else 129 exit(1); 130 } 131 if (!S_ISREG(sb1.st_mode)) 132 special = 1; 133 else { 134 if (fstat(fd2, &sb2)) { 135 if (!sflag) 136 err(ERR_EXIT, "%s", file2); 137 else 138 exit(1); 139 } 140 if (!S_ISREG(sb2.st_mode)) 141 special = 1; 142 } 143 } 144 145 if (special) 146 c_special(fd1, file1, skip1, fd2, file2, skip2); 147 else { 148 if (zflag && sb1.st_size != sb2.st_size) { 149 if (!sflag) 150 (void) printf("%s %s differ: size\n", 151 file1, file2); 152 exit(DIFF_EXIT); 153 } 154 c_regular(fd1, file1, skip1, sb1.st_size, 155 fd2, file2, skip2, sb2.st_size); 156 } 157 exit(0); 158 } 159 160 static void 161 usage(void) 162 { 163 164 (void)fprintf(stderr, 165 "usage: cmp [-l | -s | -x] [-z] file1 file2 [skip1 [skip2]]\n"); 166 exit(ERR_EXIT); 167 } 168