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 #include "lint.h" 31 #include "file64.h" 32 #include <stdio.h> 33 #include <errno.h> 34 #include <sys/types.h> 35 #include "stdiom.h" 36 37 #undef _wrtchk 38 39 /* check permissions, correct for read & write changes */ 40 int _wrtchk(FILE * iop)41_wrtchk(FILE *iop) 42 { 43 if ((iop->_flag & (_IOWRT | _IOEOF)) != _IOWRT) { 44 if (!(iop->_flag & (_IOWRT | _IORW))) { 45 iop->_flag |= _IOERR; 46 errno = EBADF; 47 return (EOF); /* stream is not writeable */ 48 } 49 iop->_flag = (iop->_flag & ~_IOEOF) | _IOWRT; 50 } 51 52 /* if first I/O to the stream get a buffer */ 53 if (iop->_base == NULL && _findbuf(iop) == NULL) 54 return (EOF); 55 else if ((iop->_ptr == iop->_base) && 56 !(iop->_flag & (_IOLBF | _IONBF))) { 57 iop->_cnt = _bufend(iop) - iop->_ptr; 58 } 59 return (0); 60 } 61