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/* $OpenBSD: readdir.c,v 1.18 2013/08/13 05:52:12 guenther 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 <dirent.h>
#include <errno.h>
#include "telldir.h"
#include "thread_private.h"
/*
* get next entry in a directory.
*/
int
_readdir_unlocked(DIR *dirp, struct dirent **result, int skipdeleted)
{
struct dirent *dp;
*result = NULL;
for (;;) {
if (dirp->dd_loc >= dirp->dd_size)
dirp->dd_loc = 0;
if (dirp->dd_loc == 0) {
dirp->dd_size = getdents(dirp->dd_fd,
(void *)dirp->dd_buf, dirp->dd_len);
if (dirp->dd_size == 0)
return (0);
if (dirp->dd_size < 0)
return (-1);
}
dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
if ((long)dp & 03 || /* bogus pointer check */
dp->d_reclen <= 0 ||
dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) {
errno = EINVAL;
return (-1);
}
dirp->dd_loc += dp->d_reclen;
/*
* When called from seekdir(), we let it decide on
* the end condition to avoid overshooting: the next
* readdir call should produce the next non-deleted entry,
* and we already advanced dd_loc.
*/
if (dp->d_ino == 0 && skipdeleted)
continue;
dirp->dd_curpos = dp->d_off;
*result = dp;
return (0);
}
}
struct dirent *
readdir(DIR *dirp)
{
struct dirent *dp;
_MUTEX_LOCK(&dirp->dd_lock);
_readdir_unlocked(dirp, &dp, 1);
_MUTEX_UNLOCK(&dirp->dd_lock);
return (dp);
}
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