Annotation of src/usr.bin/cmp/cmp.c, Revision 1.13
1.13 ! doug 1: /* $OpenBSD: cmp.c,v 1.12 2009/10/27 23:59:36 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $ */
3:
4: /*
5: * Copyright (c) 1987, 1990, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.10 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #include <sys/types.h>
34: #include <sys/stat.h>
35:
36: #include <err.h>
37: #include <fcntl.h>
38: #include <stdio.h>
39: #include <stdlib.h>
40: #include <string.h>
41: #include <unistd.h>
42: #include <locale.h>
43:
44: #include "extern.h"
45:
46: int lflag, sflag;
47:
1.9 millert 48: static void usage(void);
1.1 deraadt 49:
50: int
1.11 deraadt 51: main(int argc, char *argv[])
1.1 deraadt 52: {
53: struct stat sb1, sb2;
54: off_t skip1, skip2;
55: int ch, fd1, fd2, special;
56: char *file1, *file2;
57:
58: setlocale(LC_ALL, "");
59:
1.13 ! doug 60: if (pledge("stdio rpath", NULL) == -1)
! 61: err(1, "pledge");
! 62:
1.5 millert 63: while ((ch = getopt(argc, argv, "ls")) != -1)
1.1 deraadt 64: switch (ch) {
65: case 'l': /* print all differences */
66: lflag = 1;
67: break;
68: case 's': /* silent run */
69: sflag = 1;
70: break;
71: case '?':
72: default:
73: usage();
74: }
1.8 mickey 75:
1.1 deraadt 76: argv += optind;
77: argc -= optind;
78:
79: if (lflag && sflag)
80: errx(ERR_EXIT, "only one of -l and -s may be specified");
81:
82: if (argc < 2 || argc > 4)
83: usage();
84:
85: /* Backward compatibility -- handle "-" meaning stdin. */
86: special = 0;
87: if (strcmp(file1 = argv[0], "-") == 0) {
88: special = 1;
89: fd1 = 0;
90: file1 = "stdin";
1.11 deraadt 91: } else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) {
1.3 michaels 92: if (sflag)
93: exit(ERR_EXIT);
94: else
95: err(ERR_EXIT, "%s", file1);
96: }
1.1 deraadt 97: if (strcmp(file2 = argv[1], "-") == 0) {
1.8 mickey 98: if (special) {
1.4 michaels 99: if (sflag)
100: exit(ERR_EXIT);
101: else
102: errx(ERR_EXIT,
103: "standard input may only be specified once");
1.8 mickey 104: }
1.1 deraadt 105: special = 1;
106: fd2 = 0;
107: file2 = "stdin";
1.11 deraadt 108: } else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) {
1.4 michaels 109: if (sflag)
110: exit(ERR_EXIT);
111: else
112: err(ERR_EXIT, "%s", file2);
1.8 mickey 113: }
1.13 ! doug 114:
! 115: if (pledge("stdio", NULL) == -1)
! 116: err(1, "pledge");
1.1 deraadt 117:
1.6 deraadt 118: skip1 = argc > 2 ? strtoq(argv[2], NULL, 0) : 0;
119: skip2 = argc == 4 ? strtoq(argv[3], NULL, 0) : 0;
1.1 deraadt 120:
121: if (!special) {
1.8 mickey 122: if (fstat(fd1, &sb1)) {
1.4 michaels 123: if (sflag)
124: exit(ERR_EXIT);
125: else
126: err(ERR_EXIT, "%s", file1);
1.8 mickey 127: }
1.1 deraadt 128: if (!S_ISREG(sb1.st_mode))
129: special = 1;
130: else {
1.8 mickey 131: if (fstat(fd2, &sb2)) {
1.4 michaels 132: if (sflag)
133: exit(ERR_EXIT);
134: else
135: err(ERR_EXIT, "%s", file2);
1.8 mickey 136: }
1.1 deraadt 137: if (!S_ISREG(sb2.st_mode))
138: special = 1;
139: }
140: }
141:
142: if (special)
143: c_special(fd1, file1, skip1, fd2, file2, skip2);
144: else
145: c_regular(fd1, file1, skip1, sb1.st_size,
146: fd2, file2, skip2, sb2.st_size);
1.3 michaels 147: return 0;
1.1 deraadt 148: }
149:
150: static void
1.11 deraadt 151: usage(void)
1.1 deraadt 152: {
153:
154: (void)fprintf(stderr,
1.7 deraadt 155: "usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n");
1.1 deraadt 156: exit(ERR_EXIT);
157: }
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