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