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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 #include "synonyms.h" 34 #include "file64.h" 35 #include <stdio.h> 36 #include <errno.h> 37 #include <sys/types.h> 38 #include "stdiom.h" 39 40 #undef _wrtchk 41 42 /* check permissions, correct for read & write changes */ 43 int 44 _wrtchk(FILE *iop) 45 { 46 if ((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) { 47 if (!(iop->_flag & (_IOWRT | _IORW))) { 48 iop->_flag |= _IOERR; 49 errno = EBADF; 50 return (EOF); /* stream is not writeable */ 51 } 52 iop->_flag = (iop->_flag & ~_IOEOF) | _IOWRT; 53 } 54 55 /* if first I/O to the stream get a buffer */ 56 if (iop->_base == NULL && _findbuf(iop) == NULL) 57 return (EOF); 58 else if ((iop->_ptr == iop->_base) && 59 !(iop->_flag & (_IOLBF | _IONBF))) { 60 iop->_cnt = _bufend(iop) - iop->_ptr; 61 } 62 return (0); 63 } 64