11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed to Berkeley by 61573Srgrimes * Chris Torek. 71573Srgrimes * 81573Srgrimes * Redistribution and use in source and binary forms, with or without 91573Srgrimes * modification, are permitted provided that the following conditions 101573Srgrimes * are met: 111573Srgrimes * 1. Redistributions of source code must retain the above copyright 121573Srgrimes * notice, this list of conditions and the following disclaimer. 131573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer in the 151573Srgrimes * documentation and/or other materials provided with the distribution. 16249808Semaste * 3. Neither the name of the University nor the names of its contributors 171573Srgrimes * may be used to endorse or promote products derived from this software 181573Srgrimes * without specific prior written permission. 191573Srgrimes * 201573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301573Srgrimes * SUCH DAMAGE. 311573Srgrimes */ 321573Srgrimes 331573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 341573Srgrimesstatic char sccsid[] = "@(#)wsetup.c 8.1 (Berkeley) 6/4/93"; 351573Srgrimes#endif /* LIBC_SCCS and not lint */ 3692986Sobrien#include <sys/cdefs.h> 3792986Sobrien__FBSDID("$FreeBSD$"); 381573Srgrimes 39130230Sdas#include <errno.h> 401573Srgrimes#include <stdio.h> 411573Srgrimes#include <stdlib.h> 421573Srgrimes#include "local.h" 431573Srgrimes 441573Srgrimes/* 451573Srgrimes * Various output routines call wsetup to be sure it is safe to write, 461573Srgrimes * because either _flags does not include __SWR, or _buf is NULL. 47130230Sdas * _wsetup returns 0 if OK to write; otherwise, it returns EOF and sets errno. 481573Srgrimes */ 4916586Sjraynardint 50249810Semaste__swsetup(FILE *fp) 511573Srgrimes{ 521573Srgrimes /* make sure stdio is set up */ 531573Srgrimes if (!__sdidinit) 541573Srgrimes __sinit(); 551573Srgrimes 561573Srgrimes /* 571573Srgrimes * If we are not writing, we had better be reading and writing. 581573Srgrimes */ 591573Srgrimes if ((fp->_flags & __SWR) == 0) { 60130230Sdas if ((fp->_flags & __SRW) == 0) { 61130230Sdas errno = EBADF; 62186887Sdas fp->_flags |= __SERR; 631573Srgrimes return (EOF); 64130230Sdas } 651573Srgrimes if (fp->_flags & __SRD) { 661573Srgrimes /* clobber any ungetc data */ 671573Srgrimes if (HASUB(fp)) 681573Srgrimes FREEUB(fp); 691573Srgrimes fp->_flags &= ~(__SRD|__SEOF); 701573Srgrimes fp->_r = 0; 711573Srgrimes fp->_p = fp->_bf._base; 721573Srgrimes } 731573Srgrimes fp->_flags |= __SWR; 741573Srgrimes } 751573Srgrimes 761573Srgrimes /* 771573Srgrimes * Make a buffer if necessary, then set _w. 781573Srgrimes */ 791573Srgrimes if (fp->_bf._base == NULL) 801573Srgrimes __smakebuf(fp); 811573Srgrimes if (fp->_flags & __SLBF) { 821573Srgrimes /* 831573Srgrimes * It is line buffered, so make _lbfsize be -_bufsize 841573Srgrimes * for the putc() macro. We will change _lbfsize back 851573Srgrimes * to 0 whenever we turn off __SWR. 861573Srgrimes */ 871573Srgrimes fp->_w = 0; 881573Srgrimes fp->_lbfsize = -fp->_bf._size; 891573Srgrimes } else 901573Srgrimes fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size; 911573Srgrimes return (0); 921573Srgrimes} 93