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pwd.c revision 1.8 
      1 /*	$NetBSD: pwd.c,v 1.8 1997/07/20 20:39:45 christos 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 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) 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 __RCSID("$NetBSD: pwd.c,v 1.8 1997/07/20 20:39:45 christos 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 int  main __P((int, char *[]));
     57 
     58 int
     59 main(argc, argv)
     60 	int argc;
     61 	char *argv[];
     62 {
     63 	int ch;
     64 	char *p;
     65 
     66 	/*
     67 	 * Flags for pwd are a bit strange.  The POSIX 1003.2B/D9 document
     68 	 * has an optional -P flag for physical, which is what this program
     69 	 * will produce by default.  The logical flag, -L, should fail, as
     70 	 * there's no way to display a logical path after forking.  We don't
     71 	 * document either flag, only adding -P for future portability.
     72 	 */
     73 	while ((ch = getopt(argc, argv, "P")) != EOF)
     74 		switch (ch) {
     75 		case 'P':
     76 			break;
     77 		case '?':
     78 		default:
     79 			usage();
     80 		}
     81 	argc -= optind;
     82 	argv += optind;
     83 
     84 	if (argc != 0)
     85 		usage();
     86 
     87 	if ((p = getcwd(NULL, 0)) == NULL)
     88 		err(1, "%s", "");
     89 	(void)printf("%s\n", p);
     90 	exit(0);
     91 }
     92 
     93 void
     94 usage()
     95 {
     96 
     97 	(void)fprintf(stderr, "usage: pwd\n");
     98 	exit(1);
     99 }
    100