2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1987, 1990, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
33 static const char copyright[] =
34 "@(#) Copyright (c) 1987, 1990, 1993, 1994\n\
35 The Regents of the University of California. All rights reserved.\n";
40 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94";
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
47 #include <sys/types.h>
50 #include <capsicum_helpers.h>
65 bool lflag, sflag, xflag, zflag;
67 static const struct option long_opts[] =
69 {"verbose", no_argument, NULL, 'l'},
70 {"bytes", required_argument, NULL, 'n'},
71 {"silent", no_argument, NULL, 's'},
72 {"quiet", no_argument, NULL, 's'},
73 {NULL, no_argument, NULL, 0}
76 static void usage(void);
79 main(int argc, char *argv[])
82 off_t skip1, skip2, limit;
83 int ch, fd1, fd2, oflag;
85 const char *file1, *file2;
89 while ((ch = getopt_long(argc, argv, "+hln:sxz", long_opts, NULL)) != -1)
91 case 'h': /* Don't follow symlinks */
94 case 'l': /* print all differences */
98 if (expand_number(optarg, &limit) < 0 || limit < 0) {
99 fprintf(stderr, "Invalid --bytes: %s\n",
104 case 's': /* silent run */
107 case 'x': /* hex output */
111 case 'z': /* compare size first */
122 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted");
124 if (argc < 2 || argc > 4)
127 /* Don't limit rights on stdin since it may be one of the inputs. */
128 if (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF))
129 err(ERR_EXIT, "unable to limit rights on stdout");
130 if (caph_limit_stream(STDERR_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF))
131 err(ERR_EXIT, "unable to limit rights on stderr");
133 /* Backward compatibility -- handle "-" meaning stdin. */
135 if (strcmp(file1 = argv[0], "-") == 0) {
139 } else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) {
141 err(ERR_EXIT, "%s", file1);
145 if (strcmp(file2 = argv[1], "-") == 0) {
148 "standard input may only be specified once");
152 } else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) {
154 err(ERR_EXIT, "%s", file2);
159 if (argc > 2 && expand_number(argv[2], &skip1) < 0) {
160 fprintf(stderr, "Invalid skip1: %s\n", argv[2]);
164 if (argc == 4 && expand_number(argv[3], &skip2) < 0) {
165 fprintf(stderr, "Invalid skip2: %s\n", argv[3]);
169 if (sflag && skip1 == 0 && skip2 == 0)
174 c_link(file1, skip1, file2, skip2, limit);
177 errx(ERR_EXIT, "%s: Not a symbolic link", file2);
180 } else if (fd2 == -1) {
182 errx(ERR_EXIT, "%s: Not a symbolic link", file1);
187 /* FD rights are limited in c_special() and c_regular(). */
188 caph_cache_catpages();
191 if (fstat(fd1, &sb1)) {
193 err(ERR_EXIT, "%s", file1);
197 if (!S_ISREG(sb1.st_mode))
200 if (fstat(fd2, &sb2)) {
202 err(ERR_EXIT, "%s", file2);
206 if (!S_ISREG(sb2.st_mode))
212 c_special(fd1, file1, skip1, fd2, file2, skip2, limit);
214 if (zflag && sb1.st_size != sb2.st_size) {
216 (void) printf("%s %s differ: size\n",
220 c_regular(fd1, file1, skip1, sb1.st_size,
221 fd2, file2, skip2, sb2.st_size, limit);
230 (void)fprintf(stderr,
231 "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n");