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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1987, 1990, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif 39 40 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94"; 43 #endif 44 #endif 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 #include <sys/stat.h> 51 52 #include <err.h> 53 #include <fcntl.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 #include "extern.h" 60 61 int lflag, sflag, xflag, zflag; 62 63 static void usage(void); 64 65 int 66 main(argc, argv) 67 int argc; 68 char *argv[]; 69 { 70 struct stat sb1, sb2; 71 off_t skip1, skip2; 72 int ch, fd1, fd2, special; 73 const char *file1, *file2; 74 75 while ((ch = getopt(argc, argv, "-lsxz")) != -1) 76 switch (ch) { 77 case 'l': /* print all differences */ 78 lflag = 1; 79 break; 80 case 's': /* silent run */ 81 sflag = 1; 82 zflag = 1; 83 break; 84 case 'x': /* hex output */ 85 lflag = 1; 86 xflag = 1; 87 break; 88 case 'z': /* compare size first */ 89 zflag = 1; 90 break; 91 case '-': /* stdin (must be after options) */ 92 --optind; 93 goto endargs; 94 case '?': 95 default: 96 usage(); 97 } 98 endargs: 99 argv += optind; 100 argc -= optind; 101 102 if (lflag && sflag) 103 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted"); 104 105 if (argc < 2 || argc > 4) 106 usage(); 107 108 /* Backward compatibility -- handle "-" meaning stdin. */ 109 special = 0; 110 if (strcmp(file1 = argv[0], "-") == 0) { 111 special = 1; 112 fd1 = 0; 113 file1 = "stdin"; 114 } 115 else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { 116 if (!sflag) 117 err(ERR_EXIT, "%s", file1); 118 else 119 exit(1); 120 } 121 if (strcmp(file2 = argv[1], "-") == 0) { 122 if (special) 123 errx(ERR_EXIT, 124 "standard input may only be specified once"); 125 special = 1; 126 fd2 = 0; 127 file2 = "stdin"; 128 } 129 else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { 130 if (!sflag) 131 err(ERR_EXIT, "%s", file2); 132 else 133 exit(1); 134 } 135 136 skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0; 137 skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0; 138 139 if (!special) { 140 if (fstat(fd1, &sb1)) { 141 if (!sflag) 142 err(ERR_EXIT, "%s", file1); 143 else 144 exit(1); 145 } 146 if (!S_ISREG(sb1.st_mode)) 147 special = 1; 148 else { 149 if (fstat(fd2, &sb2)) { 150 if (!sflag) 151 err(ERR_EXIT, "%s", file2); 152 else 153 exit(1); 154 } 155 if (!S_ISREG(sb2.st_mode)) 156 special = 1; 157 } 158 } 159 160 if (special) 161 c_special(fd1, file1, skip1, fd2, file2, skip2); 162 else { 163 if (zflag && sb1.st_size != sb2.st_size) { 164 if (!sflag) 165 (void) printf("%s %s differ: size\n", 166 file1, file2); 167 exit(DIFF_EXIT); 168 } 169 c_regular(fd1, file1, skip1, sb1.st_size, 170 fd2, file2, skip2, sb2.st_size); 171 } 172 exit(0); 173 } 174 175 static void 176 usage() 177 { 178 179 (void)fprintf(stderr, 180 "usage: cmp [-l | -s | -x] [-z] file1 file2 [skip1 [skip2]]\n"); 181 exit(ERR_EXIT); 182 } 183