147 lines
3.9 KiB
C
147 lines
3.9 KiB
C
/* $NetBSD: readdir.c,v 1.18 2003/08/07 16:42:55 agc Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1983, 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)readdir.c 8.3 (Berkeley) 9/29/94";
|
|
#else
|
|
__RCSID("$NetBSD: readdir.c,v 1.18 2003/08/07 16:42:55 agc Exp $");
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include "namespace.h"
|
|
#include "reentrant.h"
|
|
#include <sys/param.h>
|
|
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#ifdef __weak_alias
|
|
__weak_alias(readdir,_readdir)
|
|
__weak_alias(readdir_r,_readdir_r)
|
|
#endif
|
|
|
|
/*
|
|
* get next entry in a directory.
|
|
*/
|
|
static struct dirent *
|
|
_readdir_unlocked(DIR *dirp)
|
|
{
|
|
struct dirent *dp;
|
|
|
|
|
|
for (;;) {
|
|
if (dirp->dd_loc >= dirp->dd_size) {
|
|
if (dirp->dd_flags & __DTF_READALL)
|
|
return (NULL);
|
|
dirp->dd_loc = 0;
|
|
}
|
|
if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
|
|
dirp->dd_seek = lseek(dirp->dd_fd, (off_t)0, SEEK_CUR);
|
|
dirp->dd_size = getdents(dirp->dd_fd,
|
|
dirp->dd_buf, (size_t)dirp->dd_len);
|
|
if (dirp->dd_size <= 0)
|
|
return (NULL);
|
|
}
|
|
dp = (struct dirent *)
|
|
(void *)(dirp->dd_buf + (size_t)dirp->dd_loc);
|
|
if ((long)dp & 03) /* bogus pointer check */
|
|
return (NULL);
|
|
/* d_reclen is unsigned; no need to compare it <= 0 */
|
|
if (dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
|
|
return (NULL);
|
|
dirp->dd_loc += dp->d_reclen;
|
|
if (dp->d_ino == 0)
|
|
continue;
|
|
if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
|
|
continue;
|
|
return (dp);
|
|
}
|
|
}
|
|
|
|
struct dirent *
|
|
readdir(dirp)
|
|
DIR *dirp;
|
|
{
|
|
struct dirent *dp;
|
|
|
|
#ifdef _REENTRANT
|
|
if (__isthreaded) {
|
|
mutex_lock((mutex_t *)dirp->dd_lock);
|
|
dp = _readdir_unlocked(dirp);
|
|
mutex_unlock((mutex_t *)dirp->dd_lock);
|
|
}
|
|
else
|
|
#endif
|
|
dp = _readdir_unlocked(dirp);
|
|
return (dp);
|
|
}
|
|
|
|
int
|
|
readdir_r(dirp, entry, result)
|
|
DIR *dirp;
|
|
struct dirent *entry;
|
|
struct dirent **result;
|
|
{
|
|
struct dirent *dp;
|
|
int saved_errno;
|
|
|
|
saved_errno = errno;
|
|
errno = 0;
|
|
#ifdef _REENTRANT
|
|
if (__isthreaded) {
|
|
mutex_lock((mutex_t *)dirp->dd_lock);
|
|
if ((dp = _readdir_unlocked(dirp)) != NULL)
|
|
memcpy(entry, dp, DIRENT_SIZE(dp));
|
|
mutex_unlock((mutex_t *)dirp->dd_lock);
|
|
}
|
|
else
|
|
#endif
|
|
if ((dp = _readdir_unlocked(dirp)) != NULL)
|
|
memcpy(entry, dp, DIRENT_SIZE(dp));
|
|
|
|
if (errno != 0) {
|
|
if (dp == NULL)
|
|
return (errno);
|
|
} else
|
|
errno = saved_errno;
|
|
|
|
if (dp != NULL)
|
|
*result = entry;
|
|
else
|
|
*result = NULL;
|
|
|
|
return (0);
|
|
}
|