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/* Read a directory in reentrant mode. Linux no-LFS version.
Copyright (C) 2018-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <dirent.h>
#if !_DIRENT_MATCHES_DIRENT64
/* Read a directory entry from DIRP. */
int
__readdir_r (DIR *dirp, struct dirent *entry, struct dirent **result)
{
struct dirent *dp;
size_t reclen;
__libc_lock_lock (dirp->lock);
while (1)
{
dp = __readdir_unlocked (dirp);
if (dp == NULL)
break;
reclen = dp->d_reclen;
if (reclen <= offsetof (struct dirent, d_name) + NAME_MAX + 1)
break;
/* The record is very long. It could still fit into the caller-supplied
buffer if we can skip padding at the end. */
size_t namelen = _D_EXACT_NAMLEN (dp);
if (namelen <= NAME_MAX)
{
reclen = offsetof (struct dirent, d_name) + namelen + 1;
break;
}
/* The name is too long. Ignore this file. */
dirp->errcode = ENAMETOOLONG;
}
if (dp != NULL)
{
*result = memcpy (entry, dp, reclen);
entry->d_reclen = reclen;
}
else
*result = NULL;
__libc_lock_unlock (dirp->lock);
return dp != NULL ? 0 : dirp->errcode;
}
weak_alias (__readdir_r, readdir_r)
#endif /* _DIRENT_MATCHES_DIRENT64 */
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