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/* pseudo system calls for M68HC11 & M68HC12.

 * Copyright (C) 1999, 2000, 2001, 2002 Stephane Carrez (stcarrez@nerim.fr)

 *

 * The authors hereby grant permission to use, copy, modify, distribute,

 * and license this software and its documentation for any purpose, provided

 * that existing copyright notices are retained in all copies and that this

 * notice is included verbatim in any distributions. No written agreement,

 * license, or royalty fee is required for any of the authorized uses.

 * Modifications to this software may be copyrighted by their authors

 * and need not follow the licensing terms described here, provided that

 * the new terms are clearly indicated on the first page of each file where

 * they apply.

 */

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

extern void outbyte(char c);

extern char inbyte(void);

int

read(int file, void *p, size_t nbytes)

{

  int i = 0;

  char* buf = (char*) p;

  for (i = 0; i < nbytes; i++) {

    *(buf + i) = inbyte();

    if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {

      i++;

      break;

    }

  }

  return (i);

}

int

write(int file, const void *p, size_t len)

{

  const char *ptr = (const char*) p;

  int todo;

  for (todo = len; todo; --todo)

    {

      outbyte (*ptr++);

    }

  return(len);

}

void *

sbrk(ptrdiff_t incr)

{

  extern char _end;             /* Defined by the linker */

  static char *heap_end;

  char *prev_heap_end;

  register char *stack_ptr asm ("sp");

  if (heap_end == 0)

    {

      heap_end = &_end;

    }

  prev_heap_end = heap_end;

  if (heap_end + incr > stack_ptr)

    {

      write (1, "Heap and stack collision\n", 25);

      abort ();

    }

  heap_end += incr;

  return ((void*) prev_heap_end);

}

/* end of syscalls.c */