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#include <_ansi.h>

#include <sys/types.h>

#include <sys/stat.h>

register char *stack_ptr asm ("sp");

caddr_t

  _sbrk(incr)

     int incr;

{

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

  static char *heap_end;

  char *prev_heap_end;

  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 (caddr_t)prev_heap_end;

}