121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/* $OpenBSD: pwd.c,v 1.14 2015/10/09 01:37:06 deraadt Exp $ */
|
|
/* $NetBSD: pwd.c,v 1.22 2011/08/29 14:51:19 joerg 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/stat.h>
|
|
|
|
#include <err.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
extern char *__progname;
|
|
static char *getcwd_logical(void);
|
|
__dead static void usage(void);
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int ch, lFlag = 0;
|
|
const char *p;
|
|
|
|
if (pledge("stdio rpath", NULL) == -1)
|
|
err(1, "pledge");
|
|
|
|
while ((ch = getopt(argc, argv, "LP")) != -1) {
|
|
switch (ch) {
|
|
case 'L':
|
|
lFlag = 1;
|
|
break;
|
|
case 'P':
|
|
lFlag = 0;
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc != 0)
|
|
usage();
|
|
|
|
if (lFlag)
|
|
p = getcwd_logical();
|
|
else
|
|
p = NULL;
|
|
if (p == NULL)
|
|
p = getcwd(NULL, 0);
|
|
|
|
if (p == NULL)
|
|
err(EXIT_FAILURE, NULL);
|
|
|
|
puts(p);
|
|
|
|
exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
static char *
|
|
getcwd_logical(void)
|
|
{
|
|
char *pwd, *p;
|
|
struct stat s_pwd, s_dot;
|
|
|
|
/* Check $PWD -- if it's right, it's fast. */
|
|
pwd = getenv("PWD");
|
|
if (pwd == NULL)
|
|
return NULL;
|
|
if (pwd[0] != '/')
|
|
return NULL;
|
|
|
|
/* check for . or .. components, including trailing ones */
|
|
for (p = pwd; *p != '\0'; p++)
|
|
if (p[0] == '/' && p[1] == '.') {
|
|
if (p[2] == '.')
|
|
p++;
|
|
if (p[2] == '\0' || p[2] == '/')
|
|
return NULL;
|
|
}
|
|
|
|
if (stat(pwd, &s_pwd) == -1 || stat(".", &s_dot) == -1)
|
|
return NULL;
|
|
if (s_pwd.st_dev != s_dot.st_dev || s_pwd.st_ino != s_dot.st_ino)
|
|
return NULL;
|
|
return pwd;
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
fprintf(stderr, "usage: %s [-LP]\n", __progname);
|
|
exit(EXIT_FAILURE);
|
|
}
|