14 #define longsperbits(n) howmany(n, bitsperlong)  argument
23 struct bitmask *bitmask_alloc(unsigned int n)  in bitmask_alloc()  argument
30 	bmp->size = n;  in bitmask_alloc()
31 	bmp->maskp = calloc(longsperbits(n), sizeof(unsigned long));  in bitmask_alloc()
61 static unsigned int _getbit(const struct bitmask *bmp, unsigned int n)  in _getbit()  argument
63 	if (n < bmp->size)  in _getbit()
64 		return (bmp->maskp[n/bitsperlong] >> (n % bitsperlong)) & 1;  in _getbit()
70 static void _setbit(struct bitmask *bmp, unsigned int n, unsigned int v)  in _setbit()  argument
72 	if (n < bmp->size) {  in _setbit()
74 			bmp->maskp[n/bitsperlong] |= 1UL << (n % bitsperlong);  in _setbit()
76 			bmp->maskp[n/bitsperlong] &=  in _setbit()
77 				~(1UL << (n % bitsperlong));  in _setbit()
174 	unsigned int n;  in bitmask_next()  local
175 	for (n = i; n < bmp->size; n++)  in bitmask_next()
176 		if (_getbit(bmp, n))  in bitmask_next()
178 	return n;  in bitmask_next()