1 /*
2 * Copyright (c) 1987, 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
16 *
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
27 * SUCH DAMAGE.
28 */
29
30 #ifndef lint
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";
34 #endif
35
36 #if 0
37 #ifndef lint
38 static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94";
39 #endif
40 #endif
41
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
44
45 #include <sys/types.h>
46 #include <sys/stat.h>
47
48 #include <err.h>
49 #include <errno.h>
50 #include <fcntl.h>
51 #include <getopt.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <unistd.h>
56
57 #include "extern.h"
58
59 int lflag, sflag, xflag, zflag;
60
61 static const struct option long_opts[] =
62 {
63 {"verbose", no_argument, NULL, 'l'},
64 {"silent", no_argument, NULL, 's'},
65 {"quiet", no_argument, NULL, 's'},
66 {NULL, no_argument, NULL, 0}
67 };
68
69 static void usage(void);
70
71 int
main(int argc,char * argv[])72 main(int argc, char *argv[])
73 {
74 struct stat sb1, sb2;
75 off_t skip1, skip2;
76 int ch, fd1, fd2, oflag, special;
77 const char *file1, *file2;
78
79 oflag = O_RDONLY;
80 while ((ch = getopt_long(argc, argv, "+hlsxz", long_opts, NULL)) != -1)
81 switch (ch) {
82 case 'h': /* Don't follow symlinks */
83 oflag |= O_NOFOLLOW;
84 break;
85 case 'l': /* print all differences */
86 lflag = 1;
87 break;
88 case 's': /* silent run */
89 sflag = 1;
90 zflag = 1;
91 break;
92 case 'x': /* hex output */
93 lflag = 1;
94 xflag = 1;
95 break;
96 case 'z': /* compare size first */
97 zflag = 1;
98 break;
99 case '?':
100 default:
101 usage();
102 }
103 argv += optind;
104 argc -= optind;
105
106 if (lflag && sflag)
107 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted");
108
109 if (argc < 2 || argc > 4)
110 usage();
111
112 /* Backward compatibility -- handle "-" meaning stdin. */
113 special = 0;
114 if (strcmp(file1 = argv[0], "-") == 0) {
115 special = 1;
116 fd1 = 0;
117 file1 = "stdin";
118 }
119 else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) {
120 if (!sflag)
121 err(ERR_EXIT, "%s", file1);
122 else
123 exit(ERR_EXIT);
124 }
125 if (strcmp(file2 = argv[1], "-") == 0) {
126 if (special)
127 errx(ERR_EXIT,
128 "standard input may only be specified once");
129 special = 1;
130 fd2 = 0;
131 file2 = "stdin";
132 }
133 else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) {
134 if (!sflag)
135 err(ERR_EXIT, "%s", file2);
136 else
137 exit(ERR_EXIT);
138 }
139
140 skip1 = argc > 2 ? strtol(argv[2], NULL, 0) : 0;
141 skip2 = argc == 4 ? strtol(argv[3], NULL, 0) : 0;
142
143 if (fd1 == -1) {
144 if (fd2 == -1) {
145 c_link(file1, skip1, file2, skip2);
146 exit(0);
147 } else if (!sflag)
148 errx(ERR_EXIT, "%s: Not a symbolic link", file2);
149 else
150 exit(ERR_EXIT);
151 } else if (fd2 == -1) {
152 if (!sflag)
153 errx(ERR_EXIT, "%s: Not a symbolic link", file1);
154 else
155 exit(ERR_EXIT);
156 }
157
158 if (!special) {
159 if (fstat(fd1, &sb1)) {
160 if (!sflag)
161 err(ERR_EXIT, "%s", file1);
162 else
163 exit(ERR_EXIT);
164 }
165 if (!S_ISREG(sb1.st_mode))
166 special = 1;
167 else {
168 if (fstat(fd2, &sb2)) {
169 if (!sflag)
170 err(ERR_EXIT, "%s", file2);
171 else
172 exit(ERR_EXIT);
173 }
174 if (!S_ISREG(sb2.st_mode))
175 special = 1;
176 }
177 }
178
179 if (special)
180 c_special(fd1, file1, skip1, fd2, file2, skip2);
181 else {
182 if (zflag && sb1.st_size != sb2.st_size) {
183 if (!sflag)
184 (void) printf("%s %s differ: size\n",
185 file1, file2);
186 exit(DIFF_EXIT);
187 }
188 c_regular(fd1, file1, skip1, sb1.st_size,
189 fd2, file2, skip2, sb2.st_size);
190 }
191 exit(0);
192 }
193
194 static void
usage(void)195 usage(void)
196 {
197
198 (void)fprintf(stderr,
199 "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n");
200 exit(ERR_EXIT);
201 }
202