xref: /illumos-gate/usr/src/lib/libc/port/stdio/getw.c (revision cd62a92d)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
57257d1b4Sraf  * Common Development and Distribution License (the "License").
67257d1b4Sraf  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
217257d1b4Sraf 
227c478bd9Sstevel@tonic-gate /*
237257d1b4Sraf  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
247c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
257c478bd9Sstevel@tonic-gate  */
267c478bd9Sstevel@tonic-gate 
277c478bd9Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
28*cd62a92dSRobert Mustacchi /*	  All Rights Reserved	*/
297c478bd9Sstevel@tonic-gate 
307c478bd9Sstevel@tonic-gate /*
317c478bd9Sstevel@tonic-gate  * The intent here is to provide a means to make the order of
327c478bd9Sstevel@tonic-gate  * bytes in an io-stream correspond to the order of the bytes
337c478bd9Sstevel@tonic-gate  * in the memory while doing the io a `word' at a time.
347c478bd9Sstevel@tonic-gate  */
357c478bd9Sstevel@tonic-gate 
367257d1b4Sraf #pragma weak _getw = getw
377c478bd9Sstevel@tonic-gate 
387257d1b4Sraf #include "lint.h"
397c478bd9Sstevel@tonic-gate #include "file64.h"
407c478bd9Sstevel@tonic-gate #include "mtlib.h"
417c478bd9Sstevel@tonic-gate #include <stdio.h>
427c478bd9Sstevel@tonic-gate #include <thread.h>
437c478bd9Sstevel@tonic-gate #include <synch.h>
447c478bd9Sstevel@tonic-gate #include "stdiom.h"
457c478bd9Sstevel@tonic-gate 
467c478bd9Sstevel@tonic-gate /* Read sizeof(int) characters from stream and return these in an int */
477c478bd9Sstevel@tonic-gate int
getw(FILE * stream)487c478bd9Sstevel@tonic-gate getw(FILE *stream)
497c478bd9Sstevel@tonic-gate {
507c478bd9Sstevel@tonic-gate 	int w;
517c478bd9Sstevel@tonic-gate 	char *s = (char *)&w;
527c478bd9Sstevel@tonic-gate 	int i = sizeof (int);
537c478bd9Sstevel@tonic-gate 	int ret;
547c478bd9Sstevel@tonic-gate 	rmutex_t *lk;
557c478bd9Sstevel@tonic-gate 
567c478bd9Sstevel@tonic-gate 	FLOCKFILE(lk, stream);
577c478bd9Sstevel@tonic-gate 	while (--i >= 0 && !(stream->_flag & (_IOERR | _IOEOF)))
58d7269947SRobert Mustacchi 		*s++ = getc_unlocked(stream);
597c478bd9Sstevel@tonic-gate 	ret = ((stream->_flag & (_IOERR | _IOEOF)) ? EOF : w);
607c478bd9Sstevel@tonic-gate 	FUNLOCKFILE(lk);
617c478bd9Sstevel@tonic-gate 	return (ret);
627c478bd9Sstevel@tonic-gate }
63