Import BSDDB 4.7.25 (as of svn r89086)
This commit is contained in:
Zachary Ware
261
clib/getcwd.c
Normal file
261
clib/getcwd.c
Normal file
@@ -0,0 +1,261 @@
|
||||
/*-
|
||||
* See the file LICENSE for redistribution information.
|
||||
*
|
||||
* Copyright (c) 1996,2008 Oracle. All rights reserved.
|
||||
*/
|
||||
/*
|
||||
* Copyright (c) 1989, 1991, 1993
|
||||
* 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.
|
||||
*
|
||||
* $Id: getcwd.c 63573 2008-05-23 21:43:21Z trent.nelson $
|
||||
*/
|
||||
|
||||
#include "db_config.h"
|
||||
|
||||
#include "db_int.h"
|
||||
|
||||
#ifdef HAVE_SYSTEM_INCLUDE_FILES
|
||||
#if HAVE_DIRENT_H
|
||||
# include <dirent.h>
|
||||
# define NAMLEN(dirent) strlen((dirent)->d_name)
|
||||
#else
|
||||
# define dirent direct
|
||||
# define NAMLEN(dirent) (dirent)->d_namlen
|
||||
# if HAVE_SYS_NDIR_H
|
||||
# include <sys/ndir.h>
|
||||
# endif
|
||||
# if HAVE_SYS_DIR_H
|
||||
# include <sys/dir.h>
|
||||
# endif
|
||||
# if HAVE_NDIR_H
|
||||
# include <ndir.h>
|
||||
# endif
|
||||
#endif
|
||||
#endif
|
||||
|
||||
#define ISDOT(dp) \
|
||||
(dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
|
||||
(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
|
||||
|
||||
#ifndef dirfd
|
||||
#define dirfd(dirp) ((dirp)->dd_fd)
|
||||
#endif
|
||||
|
||||
/*
|
||||
* getcwd --
|
||||
* Get the current working directory.
|
||||
*
|
||||
* PUBLIC: #ifndef HAVE_GETCWD
|
||||
* PUBLIC: char *getcwd __P((char *, size_t));
|
||||
* PUBLIC: #endif
|
||||
*/
|
||||
char *
|
||||
getcwd(pt, size)
|
||||
char *pt;
|
||||
size_t size;
|
||||
{
|
||||
register struct dirent *dp;
|
||||
register DIR *dir;
|
||||
register dev_t dev;
|
||||
register ino_t ino;
|
||||
register int first;
|
||||
register char *bpt, *bup;
|
||||
struct stat s;
|
||||
dev_t root_dev;
|
||||
ino_t root_ino;
|
||||
size_t ptsize, upsize;
|
||||
int ret, save_errno;
|
||||
char *ept, *eup, *up;
|
||||
|
||||
/*
|
||||
* If no buffer specified by the user, allocate one as necessary.
|
||||
* If a buffer is specified, the size has to be non-zero. The path
|
||||
* is built from the end of the buffer backwards.
|
||||
*/
|
||||
if (pt) {
|
||||
ptsize = 0;
|
||||
if (!size) {
|
||||
__os_set_errno(EINVAL);
|
||||
return (NULL);
|
||||
}
|
||||
if (size == 1) {
|
||||
__os_set_errno(ERANGE);
|
||||
return (NULL);
|
||||
}
|
||||
ept = pt + size;
|
||||
} else {
|
||||
if ((ret =
|
||||
__os_malloc(NULL, ptsize = 1024 - 4, &pt)) != 0) {
|
||||
__os_set_errno(ret);
|
||||
return (NULL);
|
||||
}
|
||||
ept = pt + ptsize;
|
||||
}
|
||||
bpt = ept - 1;
|
||||
*bpt = '\0';
|
||||
|
||||
/*
|
||||
* Allocate bytes (1024 - malloc space) for the string of "../"'s.
|
||||
* Should always be enough (it's 340 levels). If it's not, allocate
|
||||
* as necessary. Special case the first stat, it's ".", not "..".
|
||||
*/
|
||||
if ((ret = __os_malloc(NULL, upsize = 1024 - 4, &up)) != 0)
|
||||
goto err;
|
||||
eup = up + 1024;
|
||||
bup = up;
|
||||
up[0] = '.';
|
||||
up[1] = '\0';
|
||||
|
||||
/* Save root values, so know when to stop. */
|
||||
if (stat("/", &s))
|
||||
goto err;
|
||||
root_dev = s.st_dev;
|
||||
root_ino = s.st_ino;
|
||||
|
||||
__os_set_errno(0); /* XXX readdir has no error return. */
|
||||
|
||||
for (first = 1;; first = 0) {
|
||||
/* Stat the current level. */
|
||||
if (lstat(up, &s))
|
||||
goto err;
|
||||
|
||||
/* Save current node values. */
|
||||
ino = s.st_ino;
|
||||
dev = s.st_dev;
|
||||
|
||||
/* Check for reaching root. */
|
||||
if (root_dev == dev && root_ino == ino) {
|
||||
*--bpt = PATH_SEPARATOR[0];
|
||||
/*
|
||||
* It's unclear that it's a requirement to copy the
|
||||
* path to the beginning of the buffer, but it's always
|
||||
* been that way and stuff would probably break.
|
||||
*/
|
||||
bcopy(bpt, pt, ept - bpt);
|
||||
__os_free(NULL, up);
|
||||
return (pt);
|
||||
}
|
||||
|
||||
/*
|
||||
* Build pointer to the parent directory, allocating memory
|
||||
* as necessary. Max length is 3 for "../", the largest
|
||||
* possible component name, plus a trailing NULL.
|
||||
*/
|
||||
if (bup + 3 + MAXNAMLEN + 1 >= eup) {
|
||||
if (__os_realloc(NULL, upsize *= 2, &up) != 0)
|
||||
goto err;
|
||||
bup = up;
|
||||
eup = up + upsize;
|
||||
}
|
||||
*bup++ = '.';
|
||||
*bup++ = '.';
|
||||
*bup = '\0';
|
||||
|
||||
/* Open and stat parent directory. */
|
||||
if (!(dir = opendir(up)) || fstat(dirfd(dir), &s))
|
||||
goto err;
|
||||
|
||||
/* Add trailing slash for next directory. */
|
||||
*bup++ = PATH_SEPARATOR[0];
|
||||
|
||||
/*
|
||||
* If it's a mount point, have to stat each element because
|
||||
* the inode number in the directory is for the entry in the
|
||||
* parent directory, not the inode number of the mounted file.
|
||||
*/
|
||||
save_errno = 0;
|
||||
if (s.st_dev == dev) {
|
||||
for (;;) {
|
||||
if (!(dp = readdir(dir)))
|
||||
goto notfound;
|
||||
if (dp->d_fileno == ino)
|
||||
break;
|
||||
}
|
||||
} else
|
||||
for (;;) {
|
||||
if (!(dp = readdir(dir)))
|
||||
goto notfound;
|
||||
if (ISDOT(dp))
|
||||
continue;
|
||||
bcopy(dp->d_name, bup, dp->d_namlen + 1);
|
||||
|
||||
/* Save the first error for later. */
|
||||
if (lstat(up, &s)) {
|
||||
if (save_errno == 0)
|
||||
save_errno = __os_get_errno();
|
||||
__os_set_errno(0);
|
||||
continue;
|
||||
}
|
||||
if (s.st_dev == dev && s.st_ino == ino)
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* Check for length of the current name, preceding slash,
|
||||
* leading slash.
|
||||
*/
|
||||
if (bpt - pt < dp->d_namlen + (first ? 1 : 2)) {
|
||||
size_t len, off;
|
||||
|
||||
if (!ptsize) {
|
||||
__os_set_errno(ERANGE);
|
||||
goto err;
|
||||
}
|
||||
off = bpt - pt;
|
||||
len = ept - bpt;
|
||||
if (__os_realloc(NULL, ptsize *= 2, &pt) != 0)
|
||||
goto err;
|
||||
bpt = pt + off;
|
||||
ept = pt + ptsize;
|
||||
bcopy(bpt, ept - len, len);
|
||||
bpt = ept - len;
|
||||
}
|
||||
if (!first)
|
||||
*--bpt = PATH_SEPARATOR[0];
|
||||
bpt -= dp->d_namlen;
|
||||
bcopy(dp->d_name, bpt, dp->d_namlen);
|
||||
(void)closedir(dir);
|
||||
|
||||
/* Truncate any file name. */
|
||||
*bup = '\0';
|
||||
}
|
||||
|
||||
notfound:
|
||||
/*
|
||||
* If readdir set errno, use it, not any saved error; otherwise,
|
||||
* didn't find the current directory in its parent directory, set
|
||||
* errno to ENOENT.
|
||||
*/
|
||||
if (__os_get_errno_ret_zero() == 0)
|
||||
__os_set_errno(save_errno == 0 ? ENOENT : save_errno);
|
||||
/* FALLTHROUGH */
|
||||
err:
|
||||
if (ptsize)
|
||||
__os_free(NULL, pt);
|
||||
__os_free(NULL, up);
|
||||
return (NULL);
|
||||
}
|
||||
Reference in New Issue
Block a user