NULL
#undef NULL /* in case <stdio.h> has defined it. */
#define NULL __null
#define NULL ((void *)0)
#define NULL (__null)
#define NULL (0)
# define NULL (0)
#define NULL 0
#define NULL (0)
#define NULL (void *) 0
#undef NULL
#define NULL 0
#define NULL 0
#undef NULL
# define NULL (__null)
# define NULL ((void*)0)
# define NULL (0)
# define NULL (__null)
# define NULL ((void*)0)
# define NULL (0)
#define NULL ((void *) 0)
# define NULL 0