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/* Copyright (C) 1991-2020 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 <errno.h>
#include <stddef.h>
#include <dirent.h>
#include <unistd.h>
#include <dirstream.h>
/* Seek to position POS in DIRP. */
void
seekdir (DIR *dirp, long int pos)
{
off64_t filepos;
__libc_lock_lock (dirp->lock);
#ifndef __LP64__
union dirstream_packed dsp;
dsp.l = pos;
if (dsp.p.is_packed == 1)
filepos = dsp.p.info;
else
{
size_t index = dsp.p.info;
if (index >= dirstream_loc_size (&dirp->locs))
return;
struct dirstream_loc *loc = dirstream_loc_at (&dirp->locs, index);
filepos = loc->filepos;
}
#else
filepos = pos;
#endif
if (dirp->filepos != filepos)
{
__lseek64 (dirp->fd, filepos, SEEK_SET);
dirp->filepos = filepos;
dirp->offset = 0;
dirp->size = 0;
}
__libc_lock_unlock (dirp->lock);
}
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