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, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984 AT&T */
28 /* All Rights Reserved */
29
30 #pragma ident "%Z%%M% %I% %E% SMI"
31
32 /*LINTLIBRARY*/
33 #include <stdio.h>
34 #include <stdarg.h>
35
36 extern int _doprnt();
37
38 int
vprintf(char * format,va_list ap)39 vprintf(char *format, va_list ap)
40 {
41 if (!(stdout->_flag & _IOWRT)) {
42 /* if no write flag */
43 if (stdout->_flag & _IORW) {
44 /* if ok, cause read-write */
45 stdout->_flag |= _IOWRT;
46 } else {
47 /* else error */
48 return (EOF);
49 }
50 }
51 return (_doprnt(format, ap, stdout));
52 }
53