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 /*
31 * Portions of this source code were derived from Berkeley 4.3 BSD
32 * under license from the Regents of the University of California.
33 */
34
35 #pragma ident "%Z%%M% %I% %E% SMI"
36
37 /*LINTLIBRARY*/
38 #include <stdio.h>
39 #include <stdarg.h>
40
41 extern int _doprnt();
42
43 int
vprintf(char * format,va_list ap)44 vprintf(char *format, va_list ap)
45 {
46 int count;
47
48 if (!(stdout->_flag & _IOWRT)) {
49 /* if no write flag */
50 if (stdout->_flag & _IORW) {
51 /* if ok, cause read-write */
52 stdout->_flag |= _IOWRT;
53 } else {
54 /* else error */
55 return (EOF);
56 }
57 }
58 count = _doprnt(format, ap, stdout);
59 return (ferror(stdout)? EOF: count);
60 }
61