Subversion Repositories openrisc_2011-10-31

#include <_ansi.h>

#include <errno.h>

#include <sys/types.h>

#include <sys/stat.h>

#include "trap.h"

caddr_t

_sbrk (size_t incr)

{

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

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

  static char *heap_end;

  char *prev_heap_end;

  char *sp = (char *)&sp;

  if (heap_end == 0)

    {

      heap_end = &_end;

    }

  prev_heap_end = heap_end;

  heap_end += incr;

  if (heap_end > sp)

    {

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

      errno = ENOMEM;

      return (caddr_t)-1;

    }

  return (caddr_t) prev_heap_end;

}