/***************************************************************************
 *   Copyright (C) 2020, 2021 by Silvano Seva IU2KWO                       *
 *                                                                         *
 *   This program 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.                                   *
 *                                                                         *
 *   This program 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 this program; if not, see <http://www.gnu.org/licenses/>   *
 ***************************************************************************/

#include <stdio.h>
#include <reent.h>
#include "../drivers/usb_vcom.h"
#include "filesystem/file_access.h"

using namespace std;

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \internal
 * _write_r, write to a file
 */
int _write_r(struct _reent *ptr, int fd, const void *buf, size_t cnt)
{
    if(fd == STDOUT_FILENO || fd == STDERR_FILENO)
    {
        vcom_writeBlock(buf, cnt);
        return cnt;
    }

    /* If fd is not stdout or stderr */
    ptr->_errno = EBADF;
    return -1;
}

/**
 * \internal
 * _read_r, read from a file.
 */
int _read_r(struct _reent *ptr, int fd, void *buf, size_t cnt)
{
    if(fd == STDIN_FILENO)
    {
        for(;;)
        {
            ssize_t r = vcom_readBlock(buf, cnt);
            if((r < 0) || (r == (ssize_t)(cnt))) return r;
        }
    }

    /* If fd is not stdin */
    ptr->_errno = EBADF;
    return -1;
}

#ifdef __cplusplus
}
#endif