[unix-history] / usr / src / bin / pwd / pwd.c

/*
* Copyright (c) 1991, 1993, 1994
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1991, 1993, 1994\n\
       The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)pwd.c       8.2 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void usage __P((void));

int
main(argc, argv)
       int argc;
       char *argv[];
{
       int ch;
       char *p;

       /*
        * Flags for pwd are a bit strange.  The POSIX 1003.2B/D9 document
        * has an optional -P flag for physical, which is what this program
        * will produce by default.  The logical flag, -L, should fail, as
        * there's no way to display a logical path after forking.  We don't
        * document either flag, only adding -P for future portability.
        */
       while ((ch = getopt(argc, argv, "P")) != EOF)
               switch (ch) {
               case 'P':
                       break;
               case '?':
               default:
                       usage();
               }
       argc -= optind;
       argv += optind;

       if (argc != 0)
               usage();

       if ((p = getcwd(NULL, 0)) == NULL)
               err(1, NULL);
       (void)printf("%s\n", p);
       exit(0);
}

void
usage()
{
       (void)fprintf(stderr, "usage: pwd\n");
       exit(1);
}