isset
#define isset(a,i) \
#define isset(arr, val) (((u_char *)(arr))[(val)/NBBY] & (1<<((val)%NBBY)))
#define isset(a, i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
#define isset(a, i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
#define isset(a, i) ((a)[(i)/NBBY] & (1 << ((i)%NBBY)))
#define isset(a, i) ((a)[(i)/NBBY] & (1 << ((i)%NBBY)))
#define isset(a, i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))