/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1986 AT&T */
/*        All Rights Reserved   */

#include  "lint.h"
#include "file64.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <widec.h>
#include <string.h>
#include "libc.h"
#include "stdiom.h"

/*
 *      wsscanf -- this function will read wchar_t characters from
 *                  wchar_t string according to the conversion format.
 *                  Note that the performance degrades if the intermediate
 *                  result of conversion exceeds 1024 bytes due to the
 *                  use of malloc() on each call.
 *                  We should implement wchar_t version of doscan()
 *                  for better performance.
 */
#define MAXINSTR        1024

int
wsscanf(wchar_t *string, const char *format, ...)
{
        va_list         ap;
        size_t          i;
        char            stackbuf[MAXINSTR];
        char            *tempstring = stackbuf;
        size_t          malloced = 0;
        int             j;

        i = wcstombs(tempstring, string, MAXINSTR);
        if (i == (size_t)-1)
                return (-1);

        if (i == MAXINSTR) { /* The buffer was too small.  Malloc it. */
                tempstring = malloc(malloced = MB_CUR_MAX*wcslen(string)+1);
                if (tempstring == 0)
                        return (-1);
                i = wcstombs(tempstring, string, malloced); /* Try again. */
                if (i == (size_t)-1) {
                        free(tempstring);
                        return (-1);
                }
        }

        va_start(ap, format);
        j = vsscanf(tempstring, format, ap);
        va_end(ap);
        if (malloced) free(tempstring);
        return (j);
}