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) 1986 AT&T	*/
28/*	  All Rights Reserved  	*/
29
30#pragma ident	"%Z%%M%	%I%	%E% SMI"
31
32#include  "lint.h"
33#include "file64.h"
34#include <stdio.h>
35#include <stdarg.h>
36#include <stdlib.h>
37#include <widec.h>
38#include <string.h>
39#include "libc.h"
40#include "stdiom.h"
41
42/*
43 * 	wsscanf -- this function will read wchar_t characters from
44 *		    wchar_t string according to the conversion format.
45 *		    Note that the performance degrades if the intermediate
46 *		    result of conversion exceeds 1024 bytes due to the
47 *		    use of malloc() on each call.
48 *		    We should implement wchar_t version of doscan()
49 *		    for better performance.
50 */
51#define	MAXINSTR	1024
52
53int
54wsscanf(wchar_t *string, const char *format, ...)
55{
56	va_list		ap;
57	size_t		i;
58	char		stackbuf[MAXINSTR];
59	char		*tempstring = stackbuf;
60	size_t		malloced = 0;
61	int		j;
62
63	i = wcstombs(tempstring, string, MAXINSTR);
64	if (i == (size_t)-1)
65		return (-1);
66
67	if (i == MAXINSTR) { /* The buffer was too small.  Malloc it. */
68		tempstring = malloc(malloced = MB_CUR_MAX*wcslen(string)+1);
69		if (tempstring == 0)
70			return (-1);
71		i = wcstombs(tempstring, string, malloced); /* Try again. */
72		if (i == (size_t)-1) {
73			free(tempstring);
74			return (-1);
75		}
76	}
77
78	va_start(ap, format);
79	j = vsscanf(tempstring, format, ap);
80	va_end(ap);
81	if (malloced) free(tempstring);
82	return (j);
83}
84