xref: /freebsd/bin/pwd/pwd.c (revision 380a989b3223d455375b4fae70fd0b9bdd43bafb)
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.
32  */
33 
34 #ifndef lint
35 static char const copyright[] =
36 "@(#) Copyright (c) 1991, 1993, 1994\n\
37 	The Regents of the University of California.  All rights reserved.\n";
38 #endif /* not lint */
39 
40 #ifndef lint
41 #if 0
42 static char sccsid[] = "@(#)pwd.c	8.3 (Berkeley) 4/1/94";
43 #endif
44 static const char rcsid[] =
45 	"$Id: pwd.c,v 1.7 1998/05/15 06:30:58 charnier Exp $";
46 #endif /* not lint */
47 
48 #include <err.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <unistd.h>
52 
53 void usage __P((void));
54 
55 int
56 main(argc, argv)
57 	int argc;
58 	char *argv[];
59 {
60 	int ch;
61 	char *p;
62 
63 	/*
64 	 * Flags for pwd are a bit strange.  The POSIX 1003.2B/D9 document
65 	 * has an optional -P flag for physical, which is what this program
66 	 * will produce by default.  The logical flag, -L, should fail, as
67 	 * there's no way to display a logical path after forking.  We don't
68 	 * document either flag, only adding -P for future portability.
69 	 */
70 	while ((ch = getopt(argc, argv, "P")) != -1)
71 		switch (ch) {
72 		case 'P':
73 			break;
74 		case '?':
75 		default:
76 			usage();
77 		}
78 	argc -= optind;
79 	argv += optind;
80 
81 	if (argc != 0)
82 		usage();
83 
84 	if ((p = getcwd(NULL, 0)) == NULL)
85 		err(1, ".");
86 	(void)printf("%s\n", p);
87 	exit(0);
88 }
89 
90 void
91 usage()
92 {
93 
94 	(void)fprintf(stderr, "usage: pwd\n");
95 	exit(1);
96 }
97