1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1991, 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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #if 0
33 #ifndef lint
34 static char const copyright[] =
35 "@(#) Copyright (c) 1991, 1993, 1994\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94";
41 #endif /* not lint */
42 #endif
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD: stable/12/bin/pwd/pwd.c 335278 2018-06-17 05:14:50Z eadler $");
45
46 #include <sys/param.h>
47 #include <sys/stat.h>
48 #include <sys/types.h>
49
50 #include <err.h>
51 #include <errno.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <unistd.h>
55
56 static char *getcwd_logical(void);
57 void usage(void);
58
59 int
main(int argc,char * argv[])60 main(int argc, char *argv[])
61 {
62 int physical;
63 int ch;
64 char *p;
65
66 physical = 1;
67 while ((ch = getopt(argc, argv, "LP")) != -1)
68 switch (ch) {
69 case 'L':
70 physical = 0;
71 break;
72 case 'P':
73 physical = 1;
74 break;
75 case '?':
76 default:
77 usage();
78 }
79 argc -= optind;
80 argv += optind;
81
82 if (argc != 0)
83 usage();
84
85 /*
86 * If we're trying to find the logical current directory and that
87 * fails, behave as if -P was specified.
88 */
89 if ((!physical && (p = getcwd_logical()) != NULL) ||
90 (p = getcwd(NULL, 0)) != NULL)
91 printf("%s\n", p);
92 else
93 err(1, ".");
94
95 exit(0);
96 }
97
98 void __dead2
usage(void)99 usage(void)
100 {
101
102 (void)fprintf(stderr, "usage: pwd [-L | -P]\n");
103 exit(1);
104 }
105
106 static char *
getcwd_logical(void)107 getcwd_logical(void)
108 {
109 struct stat lg, phy;
110 char *pwd;
111
112 /*
113 * Check that $PWD is an absolute logical pathname referring to
114 * the current working directory.
115 */
116 if ((pwd = getenv("PWD")) != NULL && *pwd == '/') {
117 if (stat(pwd, &lg) == -1 || stat(".", &phy) == -1)
118 return (NULL);
119 if (lg.st_dev == phy.st_dev && lg.st_ino == phy.st_ino)
120 return (pwd);
121 }
122
123 errno = ENOENT;
124 return (NULL);
125 }
126