17c478bdstevel@tonic-gate/*
27c478bdstevel@tonic-gate * CDDL HEADER START
37c478bdstevel@tonic-gate *
47c478bdstevel@tonic-gate * The contents of this file are subject to the terms of the
57257d1braf * Common Development and Distribution License (the "License").
67257d1braf * You may not use this file except in compliance with the License.
77c478bdstevel@tonic-gate *
87c478bdstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bdstevel@tonic-gate * or http://www.opensolaris.org/os/licensing.
107c478bdstevel@tonic-gate * See the License for the specific language governing permissions
117c478bdstevel@tonic-gate * and limitations under the License.
127c478bdstevel@tonic-gate *
137c478bdstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each
147c478bdstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bdstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the
167c478bdstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying
177c478bdstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bdstevel@tonic-gate *
197c478bdstevel@tonic-gate * CDDL HEADER END
207c478bdstevel@tonic-gate */
217257d1braf
227c478bdstevel@tonic-gate/*
237257d1braf * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
247c478bdstevel@tonic-gate * Use is subject to license terms.
257c478bdstevel@tonic-gate */
267c478bdstevel@tonic-gate
277c478bdstevel@tonic-gate/*	Copyright (c) 1988 AT&T	*/
287c478bdstevel@tonic-gate/*	  All Rights Reserved  	*/
297c478bdstevel@tonic-gate
307257d1braf#pragma ident	"%Z%%M%	%I%	%E% SMI"
317c478bdstevel@tonic-gate
327257d1braf#include "lint.h"
337c478bdstevel@tonic-gate#include "file64.h"
347c478bdstevel@tonic-gate#include <stdio.h>
357c478bdstevel@tonic-gate#include <errno.h>
367c478bdstevel@tonic-gate#include <sys/types.h>
377c478bdstevel@tonic-gate#include "stdiom.h"
387c478bdstevel@tonic-gate
397c478bdstevel@tonic-gate#undef _wrtchk
407c478bdstevel@tonic-gate
417c478bdstevel@tonic-gate/* check permissions, correct for read & write changes */
427c478bdstevel@tonic-gateint
437c478bdstevel@tonic-gate_wrtchk(FILE *iop)
447c478bdstevel@tonic-gate{
457c478bdstevel@tonic-gate	if ((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) {
467c478bdstevel@tonic-gate		if (!(iop->_flag & (_IOWRT | _IORW))) {
477c478bdstevel@tonic-gate			iop->_flag |= _IOERR;
487c478bdstevel@tonic-gate			errno = EBADF;
497c478bdstevel@tonic-gate			return (EOF); /* stream is not writeable */
507c478bdstevel@tonic-gate		}
517c478bdstevel@tonic-gate		iop->_flag = (iop->_flag & ~_IOEOF) | _IOWRT;
527c478bdstevel@tonic-gate	}
537c478bdstevel@tonic-gate
547c478bdstevel@tonic-gate	/* if first I/O to the stream get a buffer */
557c478bdstevel@tonic-gate	if (iop->_base == NULL && _findbuf(iop) == NULL)
567c478bdstevel@tonic-gate		return (EOF);
577c478bdstevel@tonic-gate	else if ((iop->_ptr == iop->_base) &&
587c478bdstevel@tonic-gate	    !(iop->_flag & (_IOLBF | _IONBF))) {
597c478bdstevel@tonic-gate		iop->_cnt = _bufend(iop) - iop->_ptr;
607c478bdstevel@tonic-gate	}
617c478bdstevel@tonic-gate	return (0);
627c478bdstevel@tonic-gate}
63