/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support
 * ----------------------------------------------------------------------------
 * Copyright (c) 2009, Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
 * ----------------------------------------------------------------------------
 */

/**
  * \file syscalls.c
  *
  * Implementation of newlib syscall.
  *
  */

/*----------------------------------------------------------------------------
 *        Headers
 *----------------------------------------------------------------------------*/


#include "board.h"

#include <stdio.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>

/*----------------------------------------------------------------------------
 *        Exported variables
 *----------------------------------------------------------------------------*/

#undef errno
extern int errno ;
extern int  _end ;

/*----------------------------------------------------------------------------
 *        Exported functions
 *----------------------------------------------------------------------------*/
extern void _exit( int status ) ;
extern void _kill( int pid, int sig ) ;
extern int _getpid ( void ) ;

extern caddr_t _sbrk ( int incr )
{
    static unsigned char *heap = NULL ;
    unsigned char *prev_heap ;

    if ( heap == NULL )
    {
        heap = (unsigned char *)&_end ;
    }
    prev_heap = heap;

    heap += incr ;

    return (caddr_t) prev_heap ;
}

extern int link( char *old, char *new )
{
    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 ;
    
    for ( iIndex=0 ; iIndex < len ; iIndex++, ptr++ )
    {
        UART_PutChar( *ptr ) ;
    }
    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 ;
}