/* ----------------------------------------------------------------------------
 *         SAM Software Package License 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2011, 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 <errno.h>
#include <sys/types.h>
#include <sys/stat.h>

/*----------------------------------------------------------------------------
 *        Exported variables
 *----------------------------------------------------------------------------*/

#undef errno
extern int errno;
extern int  _sheap;

/*----------------------------------------------------------------------------
 *        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_sheap;

	if ( heap == NULL ) {
		heap = (unsigned char *)&_sheap;
	}
	prev_sheap = heap;

	heap += incr;

	return (caddr_t) prev_sheap;
}

extern int link( char *old, char *new )
{
	( void ) old;
	( void ) new;
	return -1;
}

extern int _close( int file )
{
	( void ) file;
	return -1;
}

extern int _fstat( int file, struct stat *st )
{
	( void ) file;
	st->st_mode = S_IFCHR;

	return 0;
}

extern int _isatty( int file )
{
	( void ) file;
	return 1;
}

extern int _lseek( int file, int ptr, int dir )
{
	( void ) file;
	( void ) ptr;
	( void ) dir;
	return 0;
}

extern int _read(int file, char *ptr, int len)
{
	( void ) file;
	( void ) ptr;
	( void ) len;
	return 0;
}

extern int _write( int file, char *ptr, int len )
{
	int iIndex;

	( void ) file;

	//    for (; *ptr != 0; ptr++ )
	for ( iIndex=0; iIndex < len; iIndex++, ptr++ ) {
		DBG_PutChar( *ptr );
	}

	return iIndex;
}

extern void _exit( int status )
{
	printf( "Exiting with status %d.\n", status );
	for (;;);
}

extern void _kill( int pid, int sig )
{
	( void ) pid;
	( void ) sig;
	return;
}

extern int _getpid ( void )
{
	return -1;
}