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 * 3. 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
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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
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29 * $FreeBSD: head/usr.bin/cmp/cmp.c 216370 2010-12-11 08:32:16Z joel $
31 * @(#) Copyright (c) 1987, 1990, 1993, 1994 The Regents of the University of California. All rights reserved.
32 * @(#)cmp.c 8.3 (Berkeley) 4/2/94
35 #include <sys/types.h>
48 int lflag
, sflag
, xflag
, zflag
;
50 static void usage (void);
53 main(int argc
, char **argv
)
57 int ch
, fd1
, fd2
, oflag
, special
;
58 const char *file1
, *file2
;
61 while ((ch
= getopt(argc
, argv
, "hlsxz")) != -1)
63 case 'h': /* Don't follow symlinks */
66 case 'l': /* print all differences */
69 case 's': /* silent run */
73 case 'x': /* hex output */
77 case 'z': /* compare size first */
88 errx(ERR_EXIT
, "specifying -s with -l or -x is not permitted");
90 if (argc
< 2 || argc
> 4)
93 /* Backward compatibility -- handle "-" meaning stdin. */
95 if (strcmp(file1
= argv
[0], "-") == 0) {
100 else if ((fd1
= open(file1
, oflag
, 0)) < 0 && errno
!= EMLINK
) {
102 err(ERR_EXIT
, "%s", file1
);
106 if (strcmp(file2
= argv
[1], "-") == 0) {
109 "standard input may only be specified once");
114 else if ((fd2
= open(file2
, oflag
, 0)) < 0 && errno
!= EMLINK
) {
116 err(ERR_EXIT
, "%s", file2
);
121 skip1
= argc
> 2 ? strtol(argv
[2], NULL
, 0) : 0;
122 skip2
= argc
== 4 ? strtol(argv
[3], NULL
, 0) : 0;
126 c_link(file1
, skip1
, file2
, skip2
);
129 errx(ERR_EXIT
, "%s: Not a symbolic link", file2
);
132 } else if (fd2
== -1) {
134 errx(ERR_EXIT
, "%s: Not a symbolic link", file1
);
140 if (fstat(fd1
, &sb1
)) {
142 err(ERR_EXIT
, "%s", file1
);
146 if (!S_ISREG(sb1
.st_mode
))
149 if (fstat(fd2
, &sb2
)) {
151 err(ERR_EXIT
, "%s", file2
);
155 if (!S_ISREG(sb2
.st_mode
))
161 c_special(fd1
, file1
, skip1
, fd2
, file2
, skip2
);
163 if (zflag
&& sb1
.st_size
!= sb2
.st_size
) {
165 (void) printf("%s %s differ: size\n",
169 c_regular(fd1
, file1
, skip1
, sb1
.st_size
,
170 fd2
, file2
, skip2
, sb2
.st_size
);
179 (void)fprintf(stderr
,
180 "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n");