NetBSD/bin/pwd/pwd.c

152 lines
3.7 KiB
C

/* $NetBSD: pwd.c,v 1.18 2003/09/14 19:20:23 jschauma Exp $ */
/*
* 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__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";
#else
__RCSID("$NetBSD: pwd.c,v 1.18 2003/09/14 19:20:23 jschauma Exp $");
#endif
#endif /* not lint */
#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 <string.h>
#include <unistd.h>
#include <vis.h>
int stdout_ok; /* stdout connected to a terminal */
static char *getcwd_logical(char *, size_t);
static void usage(void);
int main(int, char *[]);
int
main(int argc, char *argv[])
{
int ch, lFlag;
const char *p;
setprogname(argv[0]);
lFlag = 0;
while ((ch = getopt(argc, argv, "LP")) != -1)
switch (ch) {
case 'L':
lFlag = 1;
break;
case 'P':
lFlag = 0;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 0)
usage();
if (lFlag)
p = getcwd_logical(NULL, 0);
else
p = getcwd(NULL, 0);
if (p == NULL)
err(EXIT_FAILURE, NULL);
stdout_ok = isatty(STDOUT_FILENO);
(void)printf("%s\n", p);
exit(EXIT_SUCCESS);
/* NOTREACHED */
}
static char *
getcwd_logical(char *pt, size_t size)
{
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);
}
static void
usage(void)
{
(void)fprintf(stderr, "usage: %s [-LP]\n", getprogname());
exit(EXIT_FAILURE);
/* NOTREACHED */
}