/*
  Copyright (c) 2014 Arduino.  All right reserved.

  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

/**
  * Implementation of newlib syscall.
  *
  */

#include <errno.h>

#include "syscalls.h"
#include "sam.h"

#ifdef __cplusplus
extern "C" {
#endif

#undef errno
extern int errno ;
extern int __end__ ;
extern int __ram_end__ ;

extern caddr_t _sbrk( int incr )
{
  static unsigned char *heap = NULL ;
  unsigned char *prev_heap ;
  int ramend = (int)&__ram_end__ ;

  if ( heap == NULL )
  {
    heap = (unsigned char *)&__end__ ;
  }
  prev_heap = heap ;

  if ( ((int)prev_heap + incr) > ramend )
  {
    return (caddr_t) -1 ;
  }

  heap += incr ;

  return (caddr_t) prev_heap ;
}

extern int link( char *cOld, char *cNew )
{
    return -1 ;
}

extern int _close( int file )
{
    return -1 ;
}

extern int _fstat( int file, struct stat *st )
{
    st->st_mode = S_IFCHR ;

    return 0 ;
}

extern int _isatty( int file )
{
    return 1 ;
}

extern int _lseek( int file, int ptr, int dir )
{
    return 0 ;
}

extern int _read(int file, char *ptr, int len)
{
    return 0 ;
}

extern int _write( int file, char *ptr, int len )
{
  int iIndex=0 ;

  switch ( file )
  {
    case 1 /*STDOUT_FILENO*/:
      for ( ; len >= 0 ; len--, ptr++, iIndex++ )
      {
        // Check if the transmitter is ready
        // while ((UART->UART_SR & UART_SR_TXRDY) != UART_SR_TXRDY)
        {
        }

        // Send character
        // UART->UART_THR = *ptr;
      }
    break;

    default:
      errno = EBADF ;
      iIndex = -1 ;
    break;
  }

  return iIndex ;
}

extern void _exit( int status )
{
    printf( "Exiting with status %d.\n", status ) ;

    for ( ; ; ) ;
}

extern void _kill( int pid, int sig )
{
    return ;
}

extern int _getpid ( void )
{
    return -1 ;
}

#ifdef __cplusplus
}
#endif