/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (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 (c) 1988, 2011, Oracle and/or its affiliates. All rights reserved.
*/
/* 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 "lint.h"
#include "libc.h"
#include <mtlib.h>
#include <dirent.h>
#include <errno.h>
#include <limits.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef _LP64
long
telldir(DIR *dirp)
{
private_DIR *pdirp = (private_DIR *)dirp;
dirent_t *dp;
off_t off = 0;
lmutex_lock(&pdirp->d_lock);
/* if at beginning of dir, return 0 */
if (lseek(dirp->d_fd, 0, SEEK_CUR) != 0) {
dp = (dirent_t *)(uintptr_t)(&dirp->d_buf[dirp->d_loc]);
off = dp->d_off;
}
lmutex_unlock(&pdirp->d_lock);
return (off);
}
#else
/*
* Note: Instead of making this function static, we reduce it to local
* scope in the mapfile. That allows the linker to prevent it from
* appearing in the .SUNW_dynsymsort section.
*/
off64_t
telldir64(DIR *dirp)
{
private_DIR *pdirp = (private_DIR *)(uintptr_t)dirp;
dirent64_t *dp64;
off64_t off = 0;
lmutex_lock(&pdirp->d_lock);
/* if at beginning of dir, return 0 */
if (lseek64(dirp->d_fd, 0, SEEK_CUR) != 0) {
dp64 = (dirent64_t *)(uintptr_t)(&dirp->d_buf[dirp->d_loc]);
/* was converted by readdir and needs to be reversed */
if (dp64->d_ino == (ino64_t)-1) {
dirent_t *dp32;
dp32 = (dirent_t *)((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(&pdirp->d_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 */