/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License, Version 1.0 only

 * (the "License").  You may not use this file except in compliance

 * with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*	Copyright (c) 1988 AT&T	*/

/*	  All Rights Reserved  	*/

/*

 * telldir -- C library extension routine

 */

#include <sys/isa_defs.h>

#if !defined(_LP64)

#pragma weak telldir64 = _telldir64

#endif

#pragma weak telldir = _telldir

#include "synonyms.h"

#include <mtlib.h>

#include <sys/types.h>

#include <dirent.h>

#include <thread.h>

#include <errno.h>

#include <limits.h>

#include <synch.h>

#include <fcntl.h>

#include <stdio.h>

#include <unistd.h>

#include <inttypes.h>

extern mutex_t	_dirent_lock;

#ifdef _LP64

long

telldir(DIR *dirp)

{

	struct dirent	*dp;

	off_t off = 0;

	lmutex_lock(&_dirent_lock);

	/* if at beginning of dir, return 0 */

	if (lseek(dirp->dd_fd, 0, SEEK_CUR) != 0) {

		dp = (struct dirent *)(uintptr_t)(&dirp->dd_buf[dirp->dd_loc]);

		off = dp->d_off;

	}

	lmutex_unlock(&_dirent_lock);

	return (off);

}

#else

static off64_t

telldir64(DIR *dirp)

{

	struct dirent64	*dp64;

	off64_t		off = 0;

	lmutex_lock(&_dirent_lock);

	/* if at beginning of dir, return 0 */

	if (lseek64(dirp->dd_fd, 0, SEEK_CUR) != 0) {

		dp64 = (struct dirent64 *)

			(uintptr_t)(&dirp->dd_buf[dirp->dd_loc]);

		/* was converted by readdir and needs to be reversed */

		if (dp64->d_ino == (ino64_t)-1) {

			struct dirent	*dp32;

			dp32 = (struct dirent *)

			    ((uintptr_t)dp64 + sizeof (ino64_t));

			dp64->d_ino = (ino64_t)dp32->d_ino;

			dp64->d_off = (off64_t)dp32->d_off;

			dp64->d_reclen = (unsigned short)(dp32->d_reclen +

				((char *)&dp64->d_off - (char *)dp64));

		}

		off = dp64->d_off;

	}

	lmutex_unlock(&_dirent_lock);

	return (off);

}

long

telldir(DIR *dirp)

{

	off64_t off;

	off = telldir64(dirp);

	/*

	 * Make sure that the offset fits in 32 bits.

	 */

	if ((long)off != off &&

		(uint64_t)off > (uint64_t)UINT32_MAX) {

		errno = EOVERFLOW;

		return (-1);

	}

	return ((long)off);

}

#endif	/* _LP64 */