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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD: src/usr.bin/cmp/cmp.c,v 1.6.6.4 2001/11/21 10:47:54 dwmalone Exp $ 34 * $DragonFly: src/usr.bin/cmp/cmp.c,v 1.3 2003/10/02 17:42:27 hmp Exp $ 35 * 36 * @(#) Copyright (c) 1987, 1990, 1993, 1994 The Regents of the University of California. All rights reserved. 37 * @(#)cmp.c 8.3 (Berkeley) 4/2/94 38 */ 39 40 #include <sys/types.h> 41 #include <sys/stat.h> 42 43 #include <err.h> 44 #include <fcntl.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include "extern.h" 51 52 int lflag, sflag, xflag, zflag; 53 54 static void usage (void); 55 56 int 57 main(int argc, char **argv) 58 { 59 struct stat sb1, sb2; 60 off_t skip1, skip2; 61 int ch, fd1, fd2, special; 62 const char *file1, *file2; 63 64 while ((ch = getopt(argc, argv, "-lsxz")) != -1) 65 switch (ch) { 66 case 'l': /* print all differences */ 67 lflag = 1; 68 break; 69 case 's': /* silent run */ 70 sflag = 1; 71 zflag = 1; 72 break; 73 case 'x': /* hex output */ 74 lflag = 1; 75 xflag = 1; 76 break; 77 case 'z': /* compare size first */ 78 zflag = 1; 79 break; 80 case '-': /* stdin (must be after options) */ 81 --optind; 82 goto endargs; 83 case '?': 84 default: 85 usage(); 86 } 87 endargs: 88 argv += optind; 89 argc -= optind; 90 91 if (lflag && sflag) 92 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted"); 93 94 if (argc < 2 || argc > 4) 95 usage(); 96 97 /* Backward compatibility -- handle "-" meaning stdin. */ 98 special = 0; 99 if (strcmp(file1 = argv[0], "-") == 0) { 100 special = 1; 101 fd1 = 0; 102 file1 = "stdin"; 103 } 104 else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { 105 if (!sflag) 106 err(ERR_EXIT, "%s", file1); 107 else 108 exit(1); 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 err(ERR_EXIT, "%s", file2); 121 else 122 exit(1); 123 } 124 125 skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0; 126 skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0; 127 128 if (!special) { 129 if (fstat(fd1, &sb1)) { 130 if (!sflag) 131 err(ERR_EXIT, "%s", file1); 132 else 133 exit(1); 134 } 135 if (!S_ISREG(sb1.st_mode)) 136 special = 1; 137 else { 138 if (fstat(fd2, &sb2)) { 139 if (!sflag) 140 err(ERR_EXIT, "%s", file2); 141 else 142 exit(1); 143 } 144 if (!S_ISREG(sb2.st_mode)) 145 special = 1; 146 } 147 } 148 149 if (special) 150 c_special(fd1, file1, skip1, fd2, file2, skip2); 151 else { 152 if (zflag && sb1.st_size != sb2.st_size) { 153 if (!sflag) 154 (void) printf("%s %s differ: size\n", 155 file1, file2); 156 exit(DIFF_EXIT); 157 } 158 c_regular(fd1, file1, skip1, sb1.st_size, 159 fd2, file2, skip2, sb2.st_size); 160 } 161 exit(0); 162 } 163 164 static void 165 usage(void) 166 { 167 168 (void)fprintf(stderr, 169 "usage: cmp [-l | -s | -x] [-z] file1 file2 [skip1 [skip2]]\n"); 170 exit(ERR_EXIT); 171 } 172