1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/* $OpenBSD: cmp.c,v 1.16 2016/10/28 07:22:59 schwarze Exp $ */
/* $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $ */
/*
* Copyright (c) 1987, 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
int lflag, sflag;
static void __dead usage(void);
int
main(int argc, char *argv[])
{
struct stat sb1, sb2;
off_t skip1, skip2;
int ch, fd1, fd2, special;
char *file1, *file2;
if (pledge("stdio rpath", NULL) == -1)
err(ERR_EXIT, "pledge");
while ((ch = getopt(argc, argv, "ls")) != -1)
switch (ch) {
case 'l': /* print all differences */
lflag = 1;
break;
case 's': /* silent run */
sflag = 1;
break;
default:
usage();
}
argv += optind;
argc -= optind;
if (lflag && sflag)
errx(ERR_EXIT, "only one of -l and -s may be specified");
if (argc < 2 || argc > 4)
usage();
/* Backward compatibility -- handle "-" meaning stdin. */
special = 0;
if (strcmp(file1 = argv[0], "-") == 0) {
special = 1;
fd1 = 0;
file1 = "stdin";
} else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) {
if (sflag)
return ERR_EXIT;
else
err(ERR_EXIT, "%s", file1);
}
if (strcmp(file2 = argv[1], "-") == 0) {
if (special) {
if (sflag)
return ERR_EXIT;
else
errx(ERR_EXIT,
"standard input may only be specified once");
}
special = 1;
fd2 = 0;
file2 = "stdin";
} else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) {
if (sflag)
return ERR_EXIT;
else
err(ERR_EXIT, "%s", file2);
}
if (pledge("stdio", NULL) == -1)
err(ERR_EXIT, "pledge");
skip1 = argc > 2 ? strtoll(argv[2], NULL, 0) : 0;
skip2 = argc == 4 ? strtoll(argv[3], NULL, 0) : 0;
if (!special) {
if (fstat(fd1, &sb1)) {
if (sflag)
return ERR_EXIT;
else
err(ERR_EXIT, "%s", file1);
}
if (!S_ISREG(sb1.st_mode))
special = 1;
else {
if (fstat(fd2, &sb2)) {
if (sflag)
return ERR_EXIT;
else
err(ERR_EXIT, "%s", file2);
}
if (!S_ISREG(sb2.st_mode))
special = 1;
}
}
if (special)
c_special(fd1, file1, skip1, fd2, file2, skip2);
else
c_regular(fd1, file1, skip1, sb1.st_size,
fd2, file2, skip2, sb2.st_size);
return 0;
}
static void __dead
usage(void)
{
(void)fprintf(stderr,
"usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n");
exit(ERR_EXIT);
}
|
