1 /* 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1987, 1990, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD: head/usr.bin/cmp/cmp.c 216370 2010-12-11 08:32:16Z joel $ 32 * 33 * @(#) Copyright (c) 1987, 1990, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)cmp.c 8.3 (Berkeley) 4/2/94 35 */ 36 37 #include <sys/types.h> 38 #include <sys/stat.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <getopt.h> 44 #include <nl_types.h> 45 #include <stdbool.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #include "extern.h" 52 53 bool lflag, sflag, xflag, zflag; 54 55 static const struct option long_opts[] = 56 { 57 {"verbose", no_argument, NULL, 'l'}, 58 {"silent", no_argument, NULL, 's'}, 59 {"quiet", no_argument, NULL, 's'}, 60 {NULL, no_argument, NULL, 0} 61 }; 62 63 static void usage(void); 64 65 int 66 main(int argc, char *argv[]) 67 { 68 struct stat sb1, sb2; 69 off_t skip1, skip2; 70 int ch, fd1, fd2, oflag; 71 bool special; 72 const char *file1, *file2; 73 74 oflag = O_RDONLY; 75 while ((ch = getopt_long(argc, argv, "+hlsxz", long_opts, NULL)) != -1) 76 switch (ch) { 77 case 'h': /* Don't follow symlinks */ 78 oflag |= O_NOFOLLOW; 79 break; 80 case 'l': /* print all differences */ 81 lflag = true; 82 break; 83 case 's': /* silent run */ 84 sflag = true; 85 break; 86 case 'x': /* hex output */ 87 lflag = true; 88 xflag = true; 89 break; 90 case 'z': /* compare size first */ 91 zflag = true; 92 break; 93 case '?': 94 default: 95 usage(); 96 } 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 = false; 108 if (strcmp(file1 = argv[0], "-") == 0) { 109 special = true; 110 fd1 = STDIN_FILENO; 111 file1 = "stdin"; 112 } else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) { 113 if (!sflag) 114 err(ERR_EXIT, "%s", file1); 115 else 116 exit(ERR_EXIT); 117 } 118 if (strcmp(file2 = argv[1], "-") == 0) { 119 if (special) 120 errx(ERR_EXIT, 121 "standard input may only be specified once"); 122 special = true; 123 fd2 = STDIN_FILENO; 124 file2 = "stdin"; 125 } else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) { 126 if (!sflag) 127 err(ERR_EXIT, "%s", file2); 128 else 129 exit(ERR_EXIT); 130 } 131 132 skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0; 133 skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0; 134 135 if (sflag && skip1 == 0 && skip2 == 0) 136 zflag = true; 137 138 if (fd1 == -1) { 139 if (fd2 == -1) { 140 c_link(file1, skip1, file2, skip2); 141 exit(0); 142 } else if (!sflag) 143 errx(ERR_EXIT, "%s: Not a symbolic link", file2); 144 else 145 exit(ERR_EXIT); 146 } else if (fd2 == -1) { 147 if (!sflag) 148 errx(ERR_EXIT, "%s: Not a symbolic link", file1); 149 else 150 exit(ERR_EXIT); 151 } 152 153 if (!special) { 154 if (fstat(fd1, &sb1)) { 155 if (!sflag) 156 err(ERR_EXIT, "%s", file1); 157 else 158 exit(ERR_EXIT); 159 } 160 if (!S_ISREG(sb1.st_mode)) 161 special = true; 162 else { 163 if (fstat(fd2, &sb2)) { 164 if (!sflag) 165 err(ERR_EXIT, "%s", file2); 166 else 167 exit(ERR_EXIT); 168 } 169 if (!S_ISREG(sb2.st_mode)) 170 special = true; 171 } 172 } 173 174 if (special) 175 c_special(fd1, file1, skip1, fd2, file2, skip2); 176 else { 177 if (zflag && sb1.st_size != sb2.st_size) { 178 if (!sflag) 179 (void) printf("%s %s differ: size\n", 180 file1, file2); 181 exit(DIFF_EXIT); 182 } 183 c_regular(fd1, file1, skip1, sb1.st_size, 184 fd2, file2, skip2, sb2.st_size); 185 } 186 exit(0); 187 } 188 189 static void 190 usage(void) 191 { 192 193 (void)fprintf(stderr, 194 "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n"); 195 exit(ERR_EXIT); 196 } 197