/* Software License Agreement
 * 
 *     Copyright(C) 1994-2021 David Lindauer, (LADSoft)
 * 
 *     This file is part of the Orange C Compiler package.
 * 
 *     The Orange C Compiler package is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * 
 *     The Orange C Compiler package 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 General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License
 *     along with Orange C.  If not, see <http://www.gnu.org/licenses/>.
 * 
 *     As a special exception, if other files instantiate templates or
 *     use macros or inline functions from this file, or you compile
 *     this file and link it with other works to produce a work based
 *     on this file, this file does not by itself cause the resulting
 *     work to be covered by the GNU General Public License. However
 *     the source code for this file must still be made available in
 *     accordance with section (3) of the GNU General Public License.
 *     
 *     This exception does not invalidate any other reasons why a work
 *     based on this file might be covered by the GNU General Public
 *     License.
 * 
 *     contact information:
 *         email: TouchStone222@runbox.com <David Lindauer>
 * 
 */

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <time.h>
#include <wchar.h>
#include <locale.h>
#include "libp.h"

wchar_t* _RTL_FUNC fgetws(wchar_t* restrict buf, int num, FILE* restrict stream)
{
    flockfile(stream);
    int rv = fgetws_unlocked(buf, num, stream);
    funlockfile(stream);
    return rv;
}

wchar_t* _RTL_FUNC fgetws_unlocked(wchar_t* restrict buf, int num, FILE* restrict stream)
{
    int i = 0, rv;
    if (stream->token != FILTOK)
    {
        errno = _dos_errno = ENOENT;
        return 0;
    }
    if (stream->extended->orient == __or_narrow)
    {
        errno = EINVAL;
        return 0;
    }
    stream->extended->orient = __or_wide;
    stream->flags &= ~_F_VBUF;
    if (!(stream->flags & _F_READ))
    {
        stream->flags |= _F_ERR;
        errno = EFAULT;
        return 0;
    }
    if (stream == stdin)
        fflush(stdout);
    if (!(stream->flags & _F_IN))
    {
        if (stream->flags & _F_OUT)
        {
            if (fflush(stream))
                return 0;
        }
        if (stream->flags & _F_BUFFEREDSTRING)
        {
            if (stream->flags & _F_OUT)
                stream->level = -stream->level;
        }
        else
        {
            stream->level = stream->bsize;
        }
        stream->flags &= ~_F_OUT;
        stream->flags |= _F_IN;
    }
    if (stream->flags & _F_EOF)
        return 0;
    if (num == 0)
        return 0;
    if (stream->hold)
    {
        buf[i++] = stream->hold;
        stream->hold = 0;
    }
    for (; i < num;)
    {
        rv = __wgetc(stream);
        if (rv == WEOF)
            break;
        buf[i++] = rv;
        if (rv == '\n')
        {
            break;
        }
    }
    if (rv == WEOF && i == 0)
        return 0;
    buf[i] = 0;
    return buf;
}