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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1987, 1990, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif 35 36 #if 0 37 #ifndef lint 38 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94"; 39 #endif 40 #endif 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/types.h> 46 #include <sys/stat.h> 47 48 #include <err.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 #include "extern.h" 57 58 int lflag, sflag, xflag, zflag; 59 60 static void usage(void); 61 62 int 63 main(int argc, char *argv[]) 64 { 65 struct stat sb1, sb2; 66 off_t skip1, skip2; 67 int ch, fd1, fd2, oflag, special; 68 const char *file1, *file2; 69 70 oflag = O_RDONLY; 71 while ((ch = getopt(argc, argv, "hlsxz")) != -1) 72 switch (ch) { 73 case 'h': /* Don't follow symlinks */ 74 oflag |= O_NOFOLLOW; 75 break; 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 '?': 91 default: 92 usage(); 93 } 94 argv += optind; 95 argc -= optind; 96 97 if (lflag && sflag) 98 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted"); 99 100 if (argc < 2 || argc > 4) 101 usage(); 102 103 /* Backward compatibility -- handle "-" meaning stdin. */ 104 special = 0; 105 if (strcmp(file1 = argv[0], "-") == 0) { 106 special = 1; 107 fd1 = 0; 108 file1 = "stdin"; 109 } 110 else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) { 111 if (!sflag) 112 err(ERR_EXIT, "%s", file1); 113 else 114 exit(ERR_EXIT); 115 } 116 if (strcmp(file2 = argv[1], "-") == 0) { 117 if (special) 118 errx(ERR_EXIT, 119 "standard input may only be specified once"); 120 special = 1; 121 fd2 = 0; 122 file2 = "stdin"; 123 } 124 else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) { 125 if (!sflag) 126 err(ERR_EXIT, "%s", file2); 127 else 128 exit(ERR_EXIT); 129 } 130 131 skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0; 132 skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0; 133 134 if (fd1 == -1) { 135 if (fd2 == -1) { 136 c_link(file1, skip1, file2, skip2); 137 exit(0); 138 } else if (!sflag) 139 errx(ERR_EXIT, "%s: Not a symbolic link", file2); 140 else 141 exit(ERR_EXIT); 142 } else if (fd2 == -1) { 143 if (!sflag) 144 errx(ERR_EXIT, "%s: Not a symbolic link", file1); 145 else 146 exit(ERR_EXIT); 147 } 148 149 if (!special) { 150 if (fstat(fd1, &sb1)) { 151 if (!sflag) 152 err(ERR_EXIT, "%s", file1); 153 else 154 exit(ERR_EXIT); 155 } 156 if (!S_ISREG(sb1.st_mode)) 157 special = 1; 158 else { 159 if (fstat(fd2, &sb2)) { 160 if (!sflag) 161 err(ERR_EXIT, "%s", file2); 162 else 163 exit(ERR_EXIT); 164 } 165 if (!S_ISREG(sb2.st_mode)) 166 special = 1; 167 } 168 } 169 170 if (special) 171 c_special(fd1, file1, skip1, fd2, file2, skip2); 172 else { 173 if (zflag && sb1.st_size != sb2.st_size) { 174 if (!sflag) 175 (void) printf("%s %s differ: size\n", 176 file1, file2); 177 exit(DIFF_EXIT); 178 } 179 c_regular(fd1, file1, skip1, sb1.st_size, 180 fd2, file2, skip2, sb2.st_size); 181 } 182 exit(0); 183 } 184 185 static void 186 usage(void) 187 { 188 189 (void)fprintf(stderr, 190 "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n"); 191 exit(ERR_EXIT); 192 } 193