2 * Copyright (c) 1987, 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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";
38 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94";
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
45 #include <sys/types.h>
46 #include <sys/capsicum.h>
61 int lflag, sflag, xflag, zflag;
63 static void usage(void);
66 main(int argc, char *argv[])
70 int ch, fd1, fd2, oflag, special;
71 const char *file1, *file2;
77 while ((ch = getopt(argc, argv, "hlsxz")) != -1)
79 case 'h': /* Don't follow symlinks */
82 case 'l': /* print all differences */
85 case 's': /* silent run */
89 case 'x': /* hex output */
93 case 'z': /* compare size first */
104 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted");
106 if (argc < 2 || argc > 4)
109 /* Backward compatibility -- handle "-" meaning stdin. */
111 if (strcmp(file1 = argv[0], "-") == 0) {
116 else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) {
118 err(ERR_EXIT, "%s", file1);
122 if (strcmp(file2 = argv[1], "-") == 0) {
125 "standard input may only be specified once");
130 else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) {
132 err(ERR_EXIT, "%s", file2);
137 skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0;
138 skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0;
142 c_link(file1, skip1, file2, skip2);
145 errx(ERR_EXIT, "%s: Not a symbolic link", file2);
148 } else if (fd2 == -1) {
150 errx(ERR_EXIT, "%s: Not a symbolic link", file1);
155 cap_rights_init(&rights, CAP_FCNTL, CAP_FSTAT, CAP_MMAP_R);
156 if (cap_rights_limit(fd1, &rights) < 0 && errno != ENOSYS)
157 err(ERR_EXIT, "unable to limit rights for %s", file1);
158 if (cap_rights_limit(fd2, &rights) < 0 && errno != ENOSYS)
159 err(ERR_EXIT, "unable to limit rights for %s", file2);
161 /* Required for fdopen(3). */
162 fcntls = CAP_FCNTL_GETFL;
163 if (cap_fcntls_limit(fd1, fcntls) < 0 && errno != ENOSYS)
164 err(ERR_EXIT, "unable to limit fcntls for %s", file1);
165 if (cap_fcntls_limit(fd2, fcntls) < 0 && errno != ENOSYS)
166 err(ERR_EXIT, "unable to limit fcntls for %s", file2);
168 cap_rights_init(&rights, CAP_FSTAT, CAP_WRITE, CAP_IOCTL);
169 if (cap_rights_limit(STDOUT_FILENO, &rights) < 0 && errno != ENOSYS)
170 err(ERR_EXIT, "unable to limit rights for stdout");
172 /* Required for printf(3) via isatty(3). */
174 if (cap_ioctls_limit(STDOUT_FILENO, &cmd, 1) < 0 && errno != ENOSYS)
175 err(ERR_EXIT, "unable to limit ioctls for stdout");
178 * Cache NLS data, for strerror, for err(3), before entering capability
181 (void)catopen("libc", NL_CAT_LOCALE);
183 if (cap_enter() < 0 && errno != ENOSYS)
184 err(ERR_EXIT, "unable to enter capability mode");
187 if (fstat(fd1, &sb1)) {
189 err(ERR_EXIT, "%s", file1);
193 if (!S_ISREG(sb1.st_mode))
196 if (fstat(fd2, &sb2)) {
198 err(ERR_EXIT, "%s", file2);
202 if (!S_ISREG(sb2.st_mode))
208 c_special(fd1, file1, skip1, fd2, file2, skip2);
210 if (zflag && sb1.st_size != sb2.st_size) {
212 (void) printf("%s %s differ: size\n",
216 c_regular(fd1, file1, skip1, sb1.st_size,
217 fd2, file2, skip2, sb2.st_size);
226 (void)fprintf(stderr,
227 "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n");