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 * 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, zflag; 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 const char *file1, *file2; 72 73 while ((ch = getopt(argc, argv, "-lsxz")) != -1) 74 switch (ch) { 75 case 'l': /* print all differences */ 76 lflag = 1; 77 break; 78 case 's': /* silent run */ 79 sflag = 1; 80 zflag = 1; 81 break; 82 case 'x': /* hex output */ 83 lflag = 1; 84 xflag = 1; 85 break; 86 case 'z': /* compare size first */ 87 zflag = 1; 88 break; 89 case '-': /* stdin (must be after options) */ 90 --optind; 91 goto endargs; 92 case '?': 93 default: 94 usage(); 95 } 96 endargs: 97 argv += optind; 98 argc -= optind; 99 100 if (lflag && sflag) 101 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted"); 102 103 if (argc < 2 || argc > 4) 104 usage(); 105 106 /* Backward compatibility -- handle "-" meaning stdin. */ 107 special = 0; 108 if (strcmp(file1 = argv[0], "-") == 0) { 109 special = 1; 110 fd1 = 0; 111 file1 = "stdin"; 112 } 113 else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) { 114 if (!sflag) 115 err(ERR_EXIT, "%s", file1); 116 else 117 exit(1); 118 } 119 if (strcmp(file2 = argv[1], "-") == 0) { 120 if (special) 121 errx(ERR_EXIT, 122 "standard input may only be specified once"); 123 special = 1; 124 fd2 = 0; 125 file2 = "stdin"; 126 } 127 else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) { 128 if (!sflag) 129 err(ERR_EXIT, "%s", file2); 130 else 131 exit(1); 132 } 133 134 skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0; 135 skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0; 136 137 if (!special) { 138 if (fstat(fd1, &sb1)) { 139 if (!sflag) 140 err(ERR_EXIT, "%s", file1); 141 else 142 exit(1); 143 } 144 if (!S_ISREG(sb1.st_mode)) 145 special = 1; 146 else { 147 if (fstat(fd2, &sb2)) { 148 if (!sflag) 149 err(ERR_EXIT, "%s", file2); 150 else 151 exit(1); 152 } 153 if (!S_ISREG(sb2.st_mode)) 154 special = 1; 155 } 156 } 157 158 if (special) 159 c_special(fd1, file1, skip1, fd2, file2, skip2); 160 else { 161 if (zflag && sb1.st_size != sb2.st_size) { 162 if (!sflag) 163 (void) printf("%s %s differ: size\n", 164 file1, file2); 165 exit(DIFF_EXIT); 166 } 167 c_regular(fd1, file1, skip1, sb1.st_size, 168 fd2, file2, skip2, sb2.st_size); 169 } 170 exit(0); 171 } 172 173 static void 174 usage() 175 { 176 177 (void)fprintf(stderr, 178 "usage: cmp [-l | -s | -x] [-z] file1 file2 [skip1 [skip2]]\n"); 179 exit(ERR_EXIT); 180 } 181