xref: /titanic_51/usr/src/lib/libc/port/stdio/getw.c (revision b8a9e29c67ce838c791f49c3fd888b702b45c2fb)
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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 /*
33  * The intent here is to provide a means to make the order of
34  * bytes in an io-stream correspond to the order of the bytes
35  * in the memory while doing the io a `word' at a time.
36  */
37 
38 #pragma weak _getw = getw
39 
40 #include "lint.h"
41 #include "file64.h"
42 #include "mtlib.h"
43 #include <stdio.h>
44 #include <thread.h>
45 #include <synch.h>
46 #include "stdiom.h"
47 
48 /* Read sizeof(int) characters from stream and return these in an int */
49 int
50 getw(FILE *stream)
51 {
52 	int w;
53 	char *s = (char *)&w;
54 	int i = sizeof (int);
55 	int ret;
56 	rmutex_t *lk;
57 
58 	FLOCKFILE(lk, stream);
59 	while (--i >= 0 && !(stream->_flag & (_IOERR | _IOEOF)))
60 		*s++ = GETC(stream);
61 	ret = ((stream->_flag & (_IOERR | _IOEOF)) ? EOF : w);
62 	FUNLOCKFILE(lk);
63 	return (ret);
64 }
65