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/*
* 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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Return file offset.
* Coordinates with buffering.
*/
#pragma weak _ftell = ftell
#include "lint.h"
#include "file64.h"
#include "mtlib.h"
#include <fcntl.h>
#include <stdio.h>
#include <thread.h>
#include <synch.h>
#include <errno.h>
#include <unistd.h>
#include <stddef.h>
#include <limits.h>
#include <sys/types.h>
#include "stdiom.h"
long
ftell(FILE *iop)
{
ptrdiff_t adjust;
off64_t tres;
rmutex_t *lk;
FLOCKFILE(lk, iop);
if (iop->_cnt < 0)
iop->_cnt = 0;
if (iop->_flag & _IOREAD)
adjust = (ptrdiff_t)-iop->_cnt;
else if (iop->_flag & (_IOWRT | _IORW)) {
adjust = 0;
if (((iop->_flag & (_IOWRT | _IONBF)) == _IOWRT) &&
(iop->_base != 0))
adjust = iop->_ptr - iop->_base;
else if ((iop->_flag & _IORW) && (iop->_base != 0))
adjust = (ptrdiff_t)-iop->_cnt;
} else {
errno = EBADF; /* file descriptor refers to no open file */
FUNLOCKFILE(lk);
return (EOF);
}
tres = lseek64(FILENO(iop), 0, SEEK_CUR);
if (tres >= 0)
tres += adjust;
if (tres > LONG_MAX) {
errno = EOVERFLOW;
FUNLOCKFILE(lk);
return (EOF);
}
FUNLOCKFILE(lk);
return ((long)tres);
}
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