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