1164Seric /*
2164Seric **  USEFUL.H -- Some useful stuff.
3402Seric **
4*2975Seric **	@(#)useful.h	3.1	03/07/81
5164Seric */
6164Seric 
71388Seric # define bool	char
8164Seric # define TRUE	1
9164Seric # define FALSE	0
10164Seric 
11164Seric # ifndef NULL
12164Seric # define NULL	0
13164Seric # endif NULL
14*2975Seric 
15*2975Seric # define setbit(bit, word)	(word |= bit)
16*2975Seric # define clrbit(bit, word)	(word &= ~bit)
17*2975Seric # define bitset(bit, word)	((word) & (bit))
18