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 * 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#if 0
31#ifndef lint
32static char const copyright[] =
33"@(#) Copyright (c) 1991, 1993, 1994\n\
34	The Regents of the University of California.  All rights reserved.\n";
35#endif /* not lint */
36
37#ifndef lint
38static char sccsid[] = "@(#)pwd.c	8.3 (Berkeley) 4/1/94";
39#endif /* not lint */
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: src/bin/pwd/pwd.c,v 1.25 2005/02/09 17:37:38 ru Exp $");
43
44#include <sys/param.h>
45#include <sys/stat.h>
46#include <sys/types.h>
47
48#include <err.h>
49#include <errno.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <unistd.h>
53
54static char *getcwd_logical(void);
55void usage(void);
56
57int
58main(int argc, char *argv[])
59{
60	int physical;
61	int ch;
62	char *p;
63
64	// 4207130
65	physical = 0;
66	while ((ch = getopt(argc, argv, "LP")) != -1)
67		switch (ch) {
68		case 'L':
69			physical = 0;
70			break;
71		case 'P':
72			physical = 1;
73			break;
74		case '?':
75		default:
76			usage();
77		}
78	argc -= optind;
79	argv += optind;
80
81	if (argc != 0)
82		usage();
83
84	/*
85	 * If we're trying to find the logical current directory and that
86	 * fails, behave as if -P was specified.
87	 *
88	 * 4701537: Only fall back if $PWD was actually wrong. We want to
89	 * fail if the path is too long (errno == ENAMETOOLONG).
90	 */
91	if ((!physical && (p = getcwd_logical()) != NULL) ||
92	    ((physical || errno == ENOENT) && (p = getcwd(NULL, 0)) != NULL))
93		printf("%s\n", p);
94	else
95		err(1, ".");
96
97	exit(0);
98}
99
100void
101usage(void)
102{
103
104	(void)fprintf(stderr, "usage: pwd [-L | -P]\n");
105  	exit(1);
106}
107
108static char *
109getcwd_logical(void)
110{
111	struct stat lg, phy;
112	char *pwd;
113
114	/*
115	 * Check that $PWD is an absolute logical pathname referring to
116	 * the current working directory.
117	 */
118	if ((pwd = getenv("PWD")) != NULL && *pwd == '/') {
119		if (stat(pwd, &lg) == -1 || stat(".", &phy) == -1)
120			return (NULL);
121		if (lg.st_dev == phy.st_dev && lg.st_ino == phy.st_ino)
122			return (pwd);
123	}
124
125	errno = ENOENT;
126	return (NULL);
127}
128