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 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1987, 1990, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif 39 40 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94"; 43 #endif 44 #endif 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 #include <sys/stat.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include "extern.h" 61 62 int lflag, sflag, xflag, zflag; 63 64 static void usage(void); 65 66 int 67 main(int argc, char *argv[]) 68 { 69 struct stat sb1, sb2; 70 off_t skip1, skip2; 71 int ch, fd1, fd2, oflag, special; 72 const char *file1, *file2; 73 74 oflag = O_RDONLY; 75 while ((ch = getopt(argc, argv, "hlsxz")) != -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 = 1; 82 break; 83 case 's': /* silent run */ 84 sflag = 1; 85 zflag = 1; 86 break; 87 case 'x': /* hex output */ 88 lflag = 1; 89 xflag = 1; 90 break; 91 case 'z': /* compare size first */ 92 zflag = 1; 93 break; 94 case '?': 95 default: 96 usage(); 97 } 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, oflag, 0)) < 0 && errno != EMLINK) { 115 if (!sflag) 116 err(ERR_EXIT, "%s", file1); 117 else 118 exit(ERR_EXIT); 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, oflag, 0)) < 0 && errno != EMLINK) { 129 if (!sflag) 130 err(ERR_EXIT, "%s", file2); 131 else 132 exit(ERR_EXIT); 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 (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 = 1; 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 = 1; 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