27 #define Sbitset__nbytes(NBITS) \  argument
28   (((NBITS) + CHAR_BIT - 1) / CHAR_BIT)
33 #define Sbitset__last_byte_mask(NBITS) \  argument
34   (UCHAR_MAX << (CHAR_BIT - 1 - ((NBITS) - 1) % CHAR_BIT))
62 #define Sbitset__zero(SELF, NBITS)                                            \  argument
64   memset (SELF, 0, Sbitset__nbytes (NBITS));                                  \
68 #define Sbitset__ones(SELF, NBITS)                                            \  argument
70   memset (SELF, UCHAR_MAX, Sbitset__nbytes (NBITS));                          \
74 #define Sbitset__or(SELF, OTHER1, OTHER2, NBITS)                              \  argument
79   Sbitset end_self = ptr_self + Sbitset__nbytes (NBITS);                      \
84 #define SBITSET__FOR_EACH(SELF, NBITS, ITER, INDEX)                           \  argument
85   for ((ITER) = (SELF); (ITER) < (SELF) + Sbitset__nbytes (NBITS); ++(ITER))  \
88            (INDEX) < (NBITS) && (SELF)+(INDEX)/CHAR_BIT < (ITER)+1;           \