Annotation of src/usr.bin/cmp/cmp.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $ */
2:
3: /*
4: * Copyright (c) 1987, 1990, 1993, 1994
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: static char copyright[] =
38: "@(#) Copyright (c) 1987, 1990, 1993, 1994\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #endif /* not lint */
41:
42: #ifndef lint
43: #if 0
44: static char sccsid[] = "@(#)cmp.c 8.3 (Berkeley) 4/2/94";
45: #else
46: static char rcsid[] = "$NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $";
47: #endif
48: #endif /* not lint */
49:
50: #include <sys/types.h>
51: #include <sys/stat.h>
52:
53: #include <err.h>
54: #include <fcntl.h>
55: #include <stdio.h>
56: #include <stdlib.h>
57: #include <string.h>
58: #include <unistd.h>
59: #include <locale.h>
60:
61: #include "extern.h"
62:
63: int lflag, sflag;
64:
65: static void usage __P((void));
66:
67: int
68: main(argc, argv)
69: int argc;
70: char *argv[];
71: {
72: struct stat sb1, sb2;
73: off_t skip1, skip2;
74: int ch, fd1, fd2, special;
75: char *file1, *file2;
76:
77: setlocale(LC_ALL, "");
78:
79: while ((ch = getopt(argc, argv, "ls")) != EOF)
80: switch (ch) {
81: case 'l': /* print all differences */
82: lflag = 1;
83: break;
84: case 's': /* silent run */
85: sflag = 1;
86: break;
87: case '?':
88: default:
89: usage();
90: }
91: endargs:
92: argv += optind;
93: argc -= optind;
94:
95: if (lflag && sflag)
96: errx(ERR_EXIT, "only one of -l and -s may be specified");
97:
98: if (argc < 2 || argc > 4)
99: usage();
100:
101: /* Backward compatibility -- handle "-" meaning stdin. */
102: special = 0;
103: if (strcmp(file1 = argv[0], "-") == 0) {
104: special = 1;
105: fd1 = 0;
106: file1 = "stdin";
107: }
108: else if ((fd1 = open(file1, O_RDONLY, 0)) < 0)
109: err(ERR_EXIT, "%s", file1);
110: if (strcmp(file2 = argv[1], "-") == 0) {
111: if (special)
112: errx(ERR_EXIT,
113: "standard input may only be specified once");
114: special = 1;
115: fd2 = 0;
116: file2 = "stdin";
117: }
118: else if ((fd2 = open(file2, O_RDONLY, 0)) < 0)
119: err(ERR_EXIT, "%s", file2);
120:
121: skip1 = argc > 2 ? strtoq(argv[2], NULL, 10) : 0;
122: skip2 = argc == 4 ? strtoq(argv[3], NULL, 10) : 0;
123:
124: if (!special) {
125: if (fstat(fd1, &sb1))
126: err(ERR_EXIT, "%s", file1);
127: if (!S_ISREG(sb1.st_mode))
128: special = 1;
129: else {
130: if (fstat(fd2, &sb2))
131: err(ERR_EXIT, "%s", file2);
132: if (!S_ISREG(sb2.st_mode))
133: special = 1;
134: }
135: }
136:
137: if (special)
138: c_special(fd1, file1, skip1, fd2, file2, skip2);
139: else
140: c_regular(fd1, file1, skip1, sb1.st_size,
141: fd2, file2, skip2, sb2.st_size);
142: exit(0);
143: }
144:
145: static void
146: usage()
147: {
148:
149: (void)fprintf(stderr,
150: "usage: cmp [-l | s] file1 file2 [skip1 [skip2]]\n");
151: exit(ERR_EXIT);
152: }
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