/****************************************************************************
*  Copyright (c) 2009 by Michael Fischer. All rights reserved.
*
*  Redistribution and use in source and binary forms, with or without 
*  modification, are permitted provided that the following conditions 
*  are met:
*  
*  1. Redistributions of source code must retain the above copyright 
*     notice, this list of conditions and the following disclaimer.
*  2. Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the 
*     documentation and/or other materials provided with the distribution.
*  3. Neither the name of the author nor the names of its contributors may 
*     be used to endorse or promote products derived from this software 
*     without specific prior written permission.
*
*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
*  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
*  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
*  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
*  THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
*  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
*  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 
*  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 
*  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
*  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
*  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
*  SUCH DAMAGE.
*
****************************************************************************
*  History:
*
*  28.03.09  mifi   First Version, based on the original syscall.c from
*                   newlib version 1.17.0
****************************************************************************/

#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "uart.h"

/* Le dados de um arquivo */
int _read_r (struct _reent *r, int file, char * ptr, int len)
{
int n;
n = -1;
if(file < 3) n = U0gets(ptr, len);
return n;
}

/* Posiciona o ponteiro de leitura/escrita em um arquivo */
int _lseek_r (struct _reent *r, int file, int ptr, int dir)
{
r = r;
file = file;
ptr = ptr;
dir = dir;
return 0;
}

/* Escreve dados */
int _write_r (struct _reent *r, int file, char * ptr, int len)
{
int i;
if(file < 3){
	for(i=0; i < len; i++) {
		U0putchar(ptr[i]);
		}
	}
return len;
}

/* Fecha um arquivo */
int _close_r (struct _reent *r, int file)
{
return 0;
}

char * heap_end;

/* _sbrk_r fornaece um endereco usado para alocacao dinamica de memoria */
caddr_t _sbrk_r (struct _reent *r, int incr)
{
char *        prev_heap_end;
prev_heap_end = heap_end;
heap_end += incr;
return (caddr_t) prev_heap_end;
}

/* Pega informacoes sobre um arquivo preenche a estrutura st */
int _fstat_r (struct _reent *r, int file, struct stat * st)
{
r = r; 
file = file;
memset (st, 0, sizeof (* st));	/* Zera todos os campos*/
st->st_mode = S_IFCHR;		/* Dispositivo CHAR */
return 0;
}

/* Testa se o canal e' um terminal */
int _isatty_r(struct _reent *r, int fd)
{
r = r;
fd = fd;
return (fd < 3);
}
