-/* Nonzero if bit Y starting at address X is set. */
-#define TEST_BIT(X, Y) \
- (((unsigned char *) X)[(Y) / CHAR_BIT] & (1 << ((Y) % CHAR_BIT)))
+static const unsigned long int *
+bitvector_unit (const unsigned long int *vec, size_t idx)
+{
+ return &vec[idx / BITS_PER_ULONG];
+}
+
+static unsigned long int *
+bitvector_unit_rw (unsigned long int *vec, size_t idx)
+{
+ return &vec[idx / BITS_PER_ULONG];
+}
+
+static inline void
+bitvector_set1 (unsigned long int *vec, size_t idx)
+{
+ *bitvector_unit_rw (vec, idx) |= bitvector_mask (idx);
+}
+
+static inline void
+bitvector_set0 (unsigned long int *vec, size_t idx)
+{
+ *bitvector_unit_rw (vec, idx) &= ~bitvector_mask (idx);
+}
+
+static inline bool
+bitvector_is_set (const unsigned long int *vec, size_t idx)
+{
+ return (*bitvector_unit (vec, idx) & bitvector_mask (idx)) != 0;
+}