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
32 static 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
38 static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94";
39 #endif /* not lint */
40 #endif
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD: stable/10/bin/pwd/pwd.c 141578 2005-02-09 17:37:39Z ru $");
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
54 static char *getcwd_logical(void);
55 void usage(void);
56
57 int
main(int argc,char * argv[])58 main(int argc, char *argv[])
59 {
60 int physical;
61 int ch;
62 char *p;
63
64 physical = 1;
65 while ((ch = getopt(argc, argv, "LP")) != -1)
66 switch (ch) {
67 case 'L':
68 physical = 0;
69 break;
70 case 'P':
71 physical = 1;
72 break;
73 case '?':
74 default:
75 usage();
76 }
77 argc -= optind;
78 argv += optind;
79
80 if (argc != 0)
81 usage();
82
83 /*
84 * If we're trying to find the logical current directory and that
85 * fails, behave as if -P was specified.
86 */
87 if ((!physical && (p = getcwd_logical()) != NULL) ||
88 (p = getcwd(NULL, 0)) != NULL)
89 printf("%s\n", p);
90 else
91 err(1, ".");
92
93 exit(0);
94 }
95
96 void
usage(void)97 usage(void)
98 {
99
100 (void)fprintf(stderr, "usage: pwd [-L | -P]\n");
101 exit(1);
102 }
103
104 static char *
getcwd_logical(void)105 getcwd_logical(void)
106 {
107 struct stat lg, phy;
108 char *pwd;
109
110 /*
111 * Check that $PWD is an absolute logical pathname referring to
112 * the current working directory.
113 */
114 if ((pwd = getenv("PWD")) != NULL && *pwd == '/') {
115 if (stat(pwd, &lg) == -1 || stat(".", &phy) == -1)
116 return (NULL);
117 if (lg.st_dev == phy.st_dev && lg.st_ino == phy.st_ino)
118 return (pwd);
119 }
120
121 errno = ENOENT;
122 return (NULL);
123 }
124