2 * Copyright (c) 1987, 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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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
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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");