xref: /onnv-gate/usr/src/lib/libc/port/stdio/getw.c (revision 0:68f95e015346)
1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate  * CDDL HEADER START
3*0Sstevel@tonic-gate  *
4*0Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*0Sstevel@tonic-gate  * with the License.
8*0Sstevel@tonic-gate  *
9*0Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate  * and limitations under the License.
13*0Sstevel@tonic-gate  *
14*0Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate  *
20*0Sstevel@tonic-gate  * CDDL HEADER END
21*0Sstevel@tonic-gate  */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
24*0Sstevel@tonic-gate  * Use is subject to license terms.
25*0Sstevel@tonic-gate  */
26*0Sstevel@tonic-gate 
27*0Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
28*0Sstevel@tonic-gate 
29*0Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
30*0Sstevel@tonic-gate /*	  All Rights Reserved  	*/
31*0Sstevel@tonic-gate 
32*0Sstevel@tonic-gate 
33*0Sstevel@tonic-gate /*
34*0Sstevel@tonic-gate  * The intent here is to provide a means to make the order of
35*0Sstevel@tonic-gate  * bytes in an io-stream correspond to the order of the bytes
36*0Sstevel@tonic-gate  * in the memory while doing the io a `word' at a time.
37*0Sstevel@tonic-gate  */
38*0Sstevel@tonic-gate 
39*0Sstevel@tonic-gate #pragma weak getw = _getw
40*0Sstevel@tonic-gate 
41*0Sstevel@tonic-gate #include "synonyms.h"
42*0Sstevel@tonic-gate #include "file64.h"
43*0Sstevel@tonic-gate #include "mtlib.h"
44*0Sstevel@tonic-gate #include <stdio.h>
45*0Sstevel@tonic-gate #include <thread.h>
46*0Sstevel@tonic-gate #include <synch.h>
47*0Sstevel@tonic-gate #include "stdiom.h"
48*0Sstevel@tonic-gate 
49*0Sstevel@tonic-gate /* Read sizeof(int) characters from stream and return these in an int */
50*0Sstevel@tonic-gate int
51*0Sstevel@tonic-gate getw(FILE *stream)
52*0Sstevel@tonic-gate {
53*0Sstevel@tonic-gate 	int w;
54*0Sstevel@tonic-gate 	char *s = (char *)&w;
55*0Sstevel@tonic-gate 	int i = sizeof (int);
56*0Sstevel@tonic-gate 	int ret;
57*0Sstevel@tonic-gate 	rmutex_t *lk;
58*0Sstevel@tonic-gate 
59*0Sstevel@tonic-gate 	FLOCKFILE(lk, stream);
60*0Sstevel@tonic-gate 	while (--i >= 0 && !(stream->_flag & (_IOERR | _IOEOF)))
61*0Sstevel@tonic-gate 		*s++ = GETC(stream);
62*0Sstevel@tonic-gate 	ret = ((stream->_flag & (_IOERR | _IOEOF)) ? EOF : w);
63*0Sstevel@tonic-gate 	FUNLOCKFILE(lk);
64*0Sstevel@tonic-gate 	return (ret);
65*0Sstevel@tonic-gate }
66