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/*
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char const copyright[] =
"@(#) Copyright (c) 1991, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static char *getcwd_logical(void);
void usage(void);
int
main(int argc, char *argv[])
{
int physical;
int ch;
char *p;
physical = 1;
while ((ch = getopt(argc, argv, "LP")) != -1)
switch (ch) {
case 'L':
physical = 0;
break;
case 'P':
physical = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 0)
usage();
/*
* If we're trying to find the logical current directory and that
* fails, behave as if -P was specified.
*/
if ((!physical && (p = getcwd_logical()) != NULL) ||
(p = getcwd(NULL, 0)) != NULL)
printf("%s\n", p);
else
err(1, ".");
exit(0);
}
void
usage(void)
{
(void)fprintf(stderr, "usage: pwd [-LP]\n");
exit(1);
}
static char *
getcwd_logical(void)
{
struct stat log, phy;
char *pwd;
/*
* Check that $PWD is an absolute logical pathname referring to
* the current working directory.
*/
if ((pwd = getenv("PWD")) != NULL && *pwd == '/') {
if (stat(pwd, &log) == -1 || stat(".", &phy) == -1)
return (NULL);
if (log.st_dev == phy.st_dev && log.st_ino == phy.st_ino)
return (pwd);
}
errno = ENOENT;
return (NULL);
}
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