NetBSD/bin/pwd/pwd.c

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/* $NetBSD: pwd.c,v 1.13 1999/11/09 15:06:32 drochner Exp $ */
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/*
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* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* 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.
*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1991, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
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#if 0
static char sccsid[] = "@(#)pwd.c 8.3 (Berkeley) 4/1/94";
#else
__RCSID("$NetBSD: pwd.c,v 1.13 1999/11/09 15:06:32 drochner Exp $");
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#endif
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#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
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#include <err.h>
#include <errno.h>
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#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include <unistd.h>
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static char * getcwd_logical __P((char *, size_t));
static void usage __P((void));
int main __P((int, char *[]));
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int
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main(argc, argv)
int argc;
char *argv[];
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{
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int ch;
int lFlag = 0;
const char *p;
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while ((ch = getopt(argc, argv, "LP")) != -1)
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switch (ch) {
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case 'L':
lFlag=1;
break;
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case 'P':
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lFlag=0;
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break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 0)
usage();
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if (lFlag)
p = getcwd_logical(NULL, 0);
else
p = getcwd(NULL, 0);
if (p == NULL)
err(EXIT_FAILURE, NULL);
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(void)printf("%s\n", p);
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exit(EXIT_SUCCESS);
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/* NOTREACHED */
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}
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static char *
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getcwd_logical(pt, size)
char *pt;
size_t size;
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{
char *pwd;
size_t pwdlen;
dev_t dev;
ino_t ino;
struct stat s;
/* Check $PWD -- if it's right, it's fast. */
if ((pwd = getenv("PWD")) != NULL && pwd[0] == '/') {
if (stat(pwd, &s) != -1) {
dev = s.st_dev;
ino = s.st_ino;
if (stat(".", &s) != -1 && dev == s.st_dev &&
ino == s.st_ino) {
pwdlen = strlen(pwd);
if (pt) {
if (!size) {
errno = EINVAL;
return (NULL);
}
if (pwdlen + 1 > size) {
errno = ERANGE;
return (NULL);
}
} else if ((pt = malloc(pwdlen + 1)) == NULL)
return (NULL);
(void)memmove(pt, pwd, pwdlen);
pt[pwdlen] = '\0';
return (pt);
}
}
} else
errno = ENOENT;
return (NULL);
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}
static void
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usage()
{
(void)fprintf(stderr, "usage: pwd [-LP]\n");
exit(EXIT_FAILURE);
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/* NOTREACHED */
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}