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pwd.c revision 1.7 
      1 /*	$NetBSD: pwd.c,v 1.7 1995/03/21 09:08:18 cgd Exp $	*/
      2 
      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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 static char copyright[] =
     38 "@(#) Copyright (c) 1991, 1993, 1994\n\
     39 	The Regents of the University of California.  All rights reserved.\n";
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)pwd.c	8.3 (Berkeley) 4/1/94";
     45 #else
     46 static char rcsid[] = "$NetBSD: pwd.c,v 1.7 1995/03/21 09:08:18 cgd Exp $";
     47 #endif
     48 #endif /* not lint */
     49 
     50 #include <err.h>
     51 #include <stdio.h>
     52 #include <stdlib.h>
     53 #include <unistd.h>
     54 
     55 void usage __P((void));
     56 
     57 int
     58 main(argc, argv)
     59 	int argc;
     60 	char *argv[];
     61 {
     62 	int ch;
     63 	char *p;
     64 
     65 	/*
     66 	 * Flags for pwd are a bit strange.  The POSIX 1003.2B/D9 document
     67 	 * has an optional -P flag for physical, which is what this program
     68 	 * will produce by default.  The logical flag, -L, should fail, as
     69 	 * there's no way to display a logical path after forking.  We don't
     70 	 * document either flag, only adding -P for future portability.
     71 	 */
     72 	while ((ch = getopt(argc, argv, "P")) != EOF)
     73 		switch (ch) {
     74 		case 'P':
     75 			break;
     76 		case '?':
     77 		default:
     78 			usage();
     79 		}
     80 	argc -= optind;
     81 	argv += optind;
     82 
     83 	if (argc != 0)
     84 		usage();
     85 
     86 	if ((p = getcwd(NULL, 0)) == NULL)
     87 		err(1, NULL);
     88 	(void)printf("%s\n", p);
     89 	exit(0);
     90 }
     91 
     92 void
     93 usage()
     94 {
     95 
     96 	(void)fprintf(stderr, "usage: pwd\n");
     97 	exit(1);
     98 }
     99