Remove not needed void casts.
[dragonfly.git] / bin / pwd / pwd.c
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1/*
2 * Copyright (c) 1991, 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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#) Copyright (c) 1991, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)pwd.c 8.3 (Berkeley) 4/1/94
35 * $FreeBSD: src/bin/pwd/pwd.c,v 1.9.2.3 2002/06/17 11:04:22 tjr Exp $
57fed2af 36 * $DragonFly: src/bin/pwd/pwd.c,v 1.4 2004/11/07 20:54:51 eirikn Exp $
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37 */
38
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39#include <sys/types.h>
40#include <sys/stat.h>
41
42#include <err.h>
43#include <errno.h>
44#include <limits.h>
45#include <stdio.h>
46#include <stdlib.h>
f75716ef 47#include <string.h>
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48#include <unistd.h>
49#include <sys/param.h>
50
51static char *getcwd_logical(void);
52void usage(void);
53
54int
55main(int argc, char *argv[])
56{
57 int physical;
58 int ch;
59 char *p;
60 char buf[PATH_MAX];
61
62 if (strcmp(getprogname(), "realpath") == 0) {
63 if (argc != 2)
64 usage();
65 if ((p = realpath(argv[1], buf)) == NULL)
66 err(1, "%s", argv[1]);
57fed2af 67 printf("%s\n", p);
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68 exit(0);
69 }
70
71 physical = 1;
72 while ((ch = getopt(argc, argv, "LP")) != -1)
73 switch (ch) {
74 case 'L':
75 physical = 0;
76 break;
77 case 'P':
78 physical = 1;
79 break;
80 case '?':
81 default:
82 usage();
83 }
84 argc -= optind;
85 argv += optind;
86
87 if (argc != 0)
88 usage();
89
90 /*
91 * If we're trying to find the logical current directory and that
92 * fails, behave as if -P was specified.
93 */
94 if ((!physical && (p = getcwd_logical()) != NULL) ||
95 (p = getcwd(NULL, 0)) != NULL)
96 printf("%s\n", p);
97 else
98 err(1, ".");
99
100 exit(0);
101}
102
103void
104usage(void)
105{
106
107 if (strcmp(getprogname(), "realpath") == 0)
57fed2af 108 fprintf(stderr, "usage: realpath [path]\n");
984263bc 109 else
57fed2af 110 fprintf(stderr, "usage: pwd [-LP]\n");
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111 exit(1);
112}
113
114static char *
115getcwd_logical(void)
116{
f75716ef 117 struct stat logic, phy;
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118 char *pwd;
119
120 /*
121 * Check that $PWD is an absolute logical pathname referring to
122 * the current working directory.
123 */
124 if ((pwd = getenv("PWD")) != NULL && *pwd == '/') {
f75716ef 125 if (stat(pwd, &logic) == -1 || stat(".", &phy) == -1)
984263bc 126 return (NULL);
f75716ef 127 if (logic.st_dev == phy.st_dev && logic.st_ino == phy.st_ino)
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128 return (pwd);
129 }
130
131 errno = ENOENT;
132 return (NULL);
133}