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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #include "lint.h"
     33 #include "file64.h"
     34 #include <stdio.h>
     35 #include <errno.h>
     36 #include <sys/types.h>
     37 #include "stdiom.h"
     38 
     39 #undef _wrtchk
     40 
     41 /* check permissions, correct for read & write changes */
     42 int
     43 _wrtchk(FILE *iop)
     44 {
     45 	if ((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) {
     46 		if (!(iop->_flag & (_IOWRT | _IORW))) {
     47 			iop->_flag |= _IOERR;
     48 			errno = EBADF;
     49 			return (EOF); /* stream is not writeable */
     50 		}
     51 		iop->_flag = (iop->_flag & ~_IOEOF) | _IOWRT;
     52 	}
     53 
     54 	/* if first I/O to the stream get a buffer */
     55 	if (iop->_base == NULL && _findbuf(iop) == NULL)
     56 		return (EOF);
     57 	else if ((iop->_ptr == iop->_base) &&
     58 	    !(iop->_flag & (_IOLBF | _IONBF))) {
     59 		iop->_cnt = _bufend(iop) - iop->_ptr;
     60 	}
     61 	return (0);
     62 }
     63