1 /* Licensed under LGPLv2+ - see LICENSE file for details */
9 #define BITS_PER_LONG (sizeof(unsigned long) * 8)
11 #define BYTE(_bm, _n) (((unsigned char *)(_bm))[(_n) / 8])
12 #define LONG(_bm, _n) (((unsigned long *)(_bm))[(_n) / BITS_PER_LONG])
13 #define BIT(_n) (0x80 >> ((_n) % 8))
15 #define BYTES(_nbits) ((_nbits) / 8)
16 #define BITS(_nbits) ((~(0xff >> ((_nbits) % 8))) & 0xff)
18 static inline void bitmap_set_bit(void *bitmap, int n)
20 BYTE(bitmap, n) |= BIT(n);
23 static inline void bitmap_clear_bit(void *bitmap, int n)
25 BYTE(bitmap, n) &= ~BIT(n);
28 static inline void bitmap_change_bit(void *bitmap, int n)
30 BYTE(bitmap, n) ^= BIT(n);
33 static inline bool bitmap_test_bit(void *bitmap, int n)
35 return !!(BYTE(bitmap, n) & BIT(n));
39 static inline void bitmap_zero(void *bitmap, int nbits)
41 memset(bitmap, 0, BYTES(nbits));
43 BYTE(bitmap, nbits) &= ~BITS(nbits);
46 static inline void bitmap_fill(void *bitmap, int nbits)
48 memset(bitmap, 0xff, BYTES(nbits));
50 BYTE(bitmap, nbits) |= BITS(nbits);
53 static inline void bitmap_copy(void *dst, void *src, int nbits)
55 memcpy(dst, src, BYTES(nbits));
57 BYTE(dst, nbits) &= ~BITS(nbits);
58 BYTE(dst, nbits) |= BYTE(src, nbits) & BITS(nbits);
62 #define DEF_BINOP(_name, _op) \
63 static inline void bitmap_##_name(void *dst, void *src1, void *src2, \
67 while ((nbits - n) >= BITS_PER_LONG) { \
68 LONG(dst, n) = LONG(src1, n) _op LONG(src2, n); \
71 while ((nbits - n) >= 8) { \
72 BYTE(dst, n) = BYTE(src1, n) _op BYTE(src2, n); \
76 BYTE(dst, nbits) &= ~BITS(nbits); \
77 BYTE(dst, nbits) |= (BYTE(src1, nbits) _op BYTE(src2, nbits)) \
85 DEF_BINOP(andnot, & ~)
89 static inline void bitmap_complement(void *dst, void *src, int nbits)
93 while ((nbits - n) >= BITS_PER_LONG) {
94 LONG(dst, n) = ~LONG(src, n);
97 while ((nbits - n) >= 8) {
98 BYTE(dst, n) = ~BYTE(src, n);
102 BYTE(dst, nbits) &= ~BITS(nbits);
103 BYTE(dst, nbits) |= ~BYTE(src, nbits) & BITS(nbits);
107 static inline bool bitmap_equal(void *src1, void *src2, int nbits)
109 if (memcmp(src1, src2, BYTES(nbits)) != 0)
111 if ((BYTE(src1, nbits) & BITS(nbits))
112 != (BYTE(src2, nbits) & BITS(nbits)))
117 static inline bool bitmap_intersects(void *src1, void *src2, int nbits)
121 while ((nbits - n) >= BITS_PER_LONG) {
122 if (LONG(src1, n) & LONG(src2, n))
126 while ((nbits - n) >= 8) {
127 if (BYTE(src1, n) & BYTE(src2, n))
131 if (BITS(nbits) & BYTE(src1, nbits) & BYTE(src2, nbits)) {
137 static inline bool bitmap_subset(void *src1, void *src2, int nbits)
141 while ((nbits - n) >= BITS_PER_LONG) {
142 if (LONG(src1, n) & ~LONG(src2, n))
146 while ((nbits - n) >= 8) {
147 if (BYTE(src1, n) & ~BYTE(src2, n))
151 if (BITS(nbits) & (BYTE(src1, nbits) & ~BYTE(src2, nbits))) {
157 static inline bool bitmap_full(void *bitmap, int nbits)
161 while ((nbits - n) >= BITS_PER_LONG) {
162 if (LONG(bitmap, n) != -1UL)
166 while ((nbits - n) >= 8) {
167 if (BYTE(bitmap, n) != 0xff)
172 && ((BITS(nbits) & BYTE(bitmap, nbits)) != BITS(nbits))) {
178 static inline bool bitmap_empty(void *bitmap, int nbits)
182 while ((nbits - n) >= BITS_PER_LONG) {
187 while ((nbits - n) >= 8) {
192 if (BITS(nbits) && ((BITS(nbits) & BYTE(bitmap, nbits)))) {
199 static inline void *bitmap_alloc(int nbits)
201 return malloc((nbits + 7) / 8);
210 #endif /* CCAN_BITMAP_H_ */