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