/*  
 *      This is free software: you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License version 2, as 
 *      published by the Free Software Foundation.
 *
 *      this software 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 software.  If not, see <http://www.gnu.org/licenses/>.
 *
 *      Author: Daniele Lacamera
 *      
 *
 */  
#include <stdlib.h>
#include <stdint.h>
extern unsigned int _start_heap;

void * _sbrk_r(unsigned int incr)
{
    static unsigned char *heap = NULL;
    void *old_heap = heap;
    if (((incr >> 2) << 2) != incr)
        incr = ((incr >> 2) + 1) << 2;

    if (old_heap == NULL)
		old_heap = heap = (unsigned char *)&_start_heap;
    heap += incr;
    return old_heap;
}

int _close(int fd)
{
    return -1;
}

int _fstat(int fd)
{
    return -1;
}

int _lseek(int fd, int whence, int off)
{
    return -1;
}

int _read(uint8_t *buf, int len)
{
    return -1;
}

int _isatty(int fd)
{
    return 1;
}