/*
 * $Id$
 *
 * Copyright (C) 2003  Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Original Author: Adrian Havill <havill@redhat.com>
 *
 * Contributors:
 */

#include "wlite_config.h"   // wchar_t, NULL, size_t

#include "wlite_wchar.h"    // prototypes
#include "wlite_wctype.h"
#include "wlite_stdlib.h"

size_t
wlite_mbstowcs(wchar_t *wcs, const char *s, size_t n) {
    wlite_mbstate_t internal = { 0 };  // always begin in initial state
    size_t stored = 0;

    while (n != 0) {
        size_t length;

#if WLITE_GENERATE_SURROGATES || !WLITE_XBMP_CHAR
        if (n > 1) {
            internal.flags_ |= WLITE_MBSTATE_SURROGATE_;
        }
        else internal.flags_ &= ~WLITE_MBSTATE_SURROGATE_;
#endif
        length = wlite_mbrtowc(wcs, s, n, &internal);
        wcs += (size_t) internal.wcout_;
        n -= (size_t) internal.wcout_;
        if (length == (size_t) -1 || length == (size_t) -2) return (size_t) -1;
        else if (length == 0) break;
        else {
            stored += length;
            s += length;
        }
    }
    return stored;
}