text: /**
   * \file
   *
   * \brief Syscalls for SAM0 (GCC).
   *
   * Copyright (C) 2012-2015 Atmel Corporation. All rights reserved.
   *
   * \asf_license_start
   *
   * \page License
   *
   * 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. The name of Atmel may not be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * 4. This software may only be redistributed and used in connection with an
   *    Atmel microcontroller product.
   *
   * 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
   * EXPRESSLY AND SPECIFICALLY 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.
   *
   * \asf_license_stop
   *
   */
  /*
   * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
   */
  
  #include <stdio.h>
  #include <stdarg.h>
  #include <sys/types.h>
  #include <sys/stat.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  #undef errno
  extern int errno;
  extern int _end;
  
  extern caddr_t _sbrk(int incr);
  extern int link(char *old, char *new);
  extern int _close(int file);
  extern int _fstat(int file, struct stat *st);
  extern int _isatty(int file);
  extern int _lseek(int file, int ptr, int dir);
  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 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
  