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>
48 #include <sys/capsicum.h>
51 #include <capsicum_helpers.h>
63 int lflag, sflag, xflag, zflag;
65 static void usage(void);
68 main(int argc, char *argv[])
72 int ch, fd1, fd2, oflag, special;
73 const char *file1, *file2;
78 while ((ch = getopt(argc, argv, "hlsxz")) != -1)
80 case 'h': /* Don't follow symlinks */
83 case 'l': /* print all differences */
86 case 's': /* silent run */
90 case 'x': /* hex output */
94 case 'z': /* compare size first */
105 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted");
107 if (argc < 2 || argc > 4)
110 /* Backward compatibility -- handle "-" meaning stdin. */
112 if (strcmp(file1 = argv[0], "-") == 0) {
117 else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) {
119 err(ERR_EXIT, "%s", file1);
123 if (strcmp(file2 = argv[1], "-") == 0) {
126 "standard input may only be specified once");
131 else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) {
133 err(ERR_EXIT, "%s", file2);
138 skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0;
139 skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0;
143 c_link(file1, skip1, file2, skip2);
146 errx(ERR_EXIT, "%s: Not a symbolic link", file2);
149 } else if (fd2 == -1) {
151 errx(ERR_EXIT, "%s: Not a symbolic link", file1);
156 cap_rights_init(&rights, CAP_FCNTL, CAP_FSTAT, CAP_MMAP_R);
157 if (cap_rights_limit(fd1, &rights) < 0 && errno != ENOSYS)
158 err(ERR_EXIT, "unable to limit rights for %s", file1);
159 if (cap_rights_limit(fd2, &rights) < 0 && errno != ENOSYS)
160 err(ERR_EXIT, "unable to limit rights for %s", file2);
162 /* Required for fdopen(3). */
163 fcntls = CAP_FCNTL_GETFL;
164 if (cap_fcntls_limit(fd1, fcntls) < 0 && errno != ENOSYS)
165 err(ERR_EXIT, "unable to limit fcntls for %s", file1);
166 if (cap_fcntls_limit(fd2, fcntls) < 0 && errno != ENOSYS)
167 err(ERR_EXIT, "unable to limit fcntls for %s", file2);
170 cap_rights_init(&rights);
171 if (cap_rights_limit(STDIN_FILENO, &rights) < 0 &&
173 err(ERR_EXIT, "unable to limit stdio");
177 if (caph_limit_stdout() == -1 || caph_limit_stderr() == -1)
178 err(ERR_EXIT, "unable to limit stdio");
180 caph_cache_catpages();
182 if (cap_enter() < 0 && errno != ENOSYS)
183 err(ERR_EXIT, "unable to enter capability mode");
186 if (fstat(fd1, &sb1)) {
188 err(ERR_EXIT, "%s", file1);
192 if (!S_ISREG(sb1.st_mode))
195 if (fstat(fd2, &sb2)) {
197 err(ERR_EXIT, "%s", file2);
201 if (!S_ISREG(sb2.st_mode))
207 c_special(fd1, file1, skip1, fd2, file2, skip2);
209 if (zflag && sb1.st_size != sb2.st_size) {
211 (void) printf("%s %s differ: size\n",
215 c_regular(fd1, file1, skip1, sb1.st_size,
216 fd2, file2, skip2, sb2.st_size);
225 (void)fprintf(stderr,
226 "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n");