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pwd.c revision 1.6 
      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 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 /*static char sccsid[] = "from: @(#)pwd.c	8.3 (Berkeley) 4/1/94";*/
     42 static char *rcsid = "$Id: pwd.c,v 1.6 1994/09/22 09:25:50 mycroft Exp $";
     43 #endif /* not lint */
     44 
     45 #include <err.h>
     46 #include <stdio.h>
     47 #include <stdlib.h>
     48 #include <unistd.h>
     49 
     50 void usage __P((void));
     51 
     52 int
     53 main(argc, argv)
     54 	int argc;
     55 	char *argv[];
     56 {
     57 	int ch;
     58 	char *p;
     59 
     60 	/*
     61 	 * Flags for pwd are a bit strange.  The POSIX 1003.2B/D9 document
     62 	 * has an optional -P flag for physical, which is what this program
     63 	 * will produce by default.  The logical flag, -L, should fail, as
     64 	 * there's no way to display a logical path after forking.  We don't
     65 	 * document either flag, only adding -P for future portability.
     66 	 */
     67 	while ((ch = getopt(argc, argv, "P")) != EOF)
     68 		switch (ch) {
     69 		case 'P':
     70 			break;
     71 		case '?':
     72 		default:
     73 			usage();
     74 		}
     75 	argc -= optind;
     76 	argv += optind;
     77 
     78 	if (argc != 0)
     79 		usage();
     80 
     81 	if ((p = getcwd(NULL, 0)) == NULL)
     82 		err(1, NULL);
     83 	(void)printf("%s\n", p);
     84 	exit(0);
     85 }
     86 
     87 void
     88 usage()
     89 {
     90 
     91 	(void)fprintf(stderr, "usage: pwd\n");
     92 	exit(1);
     93 }
     94