23 typedef unsigned char bitstr_t;
27 #define _bit_byte(bit) \
31 #define _bit_mask(bit) \
36 #define bitstr_size(nbits) \
37 ((((nbits) - 1) >> 3) + 1)
40 #define bit_alloc(nbits) \
41 (bitstr_t *)malloc(1, \
42 (unsigned int)bitstr_size(nbits) * sizeof(bitstr_t))
45 #define bit_decl(name, nbits) \
46 (name)[bitstr_size(nbits)]
49 #define bit_test(name, bit) \
50 ((name)[_bit_byte(bit)] & _bit_mask(bit))
53 #define bit_set(name, bit) \
54 (name)[_bit_byte(bit)] |= _bit_mask(bit)
57 #define bit_clear(name, bit) \
58 (name)[_bit_byte(bit)] &= ~_bit_mask(bit)
61 #define bit_nclear(name, start, stop) { \
62 register bitstr_t *_name = name; \
63 register int _start = start, _stop = stop; \
64 register int _startbyte = _bit_byte(_start); \
65 register int _stopbyte = _bit_byte(_stop); \
66 if (_startbyte == _stopbyte) { \
67 _name[_startbyte] &= ((0xff >> (8 - (_start&0x7))) | \
68 (0xff << ((_stop&0x7) + 1))); \
70 _name[_startbyte] &= 0xff >> (8 - (_start&0x7)); \
71 while (++_startbyte < _stopbyte) \
72 _name[_startbyte] = 0; \
73 _name[_stopbyte] &= 0xff << ((_stop&0x7) + 1); \
78 #define bit_nset(name, start, stop) { \
79 register bitstr_t *_name = name; \
80 register int _start = start, _stop = stop; \
81 register int _startbyte = _bit_byte(_start); \
82 register int _stopbyte = _bit_byte(_stop); \
83 if (_startbyte == _stopbyte) { \
84 _name[_startbyte] |= ((0xff << (_start&0x7)) & \
85 (0xff >> (7 - (_stop&0x7)))); \
87 _name[_startbyte] |= 0xff << ((_start)&0x7); \
88 while (++_startbyte < _stopbyte) \
89 _name[_startbyte] = 0xff; \
90 _name[_stopbyte] |= 0xff >> (7 - (_stop&0x7)); \
95 #define bit_ffc(name, nbits, value) { \
96 register bitstr_t *_name = name; \
97 register int _byte, _nbits = nbits; \
98 register int _stopbyte = _bit_byte(_nbits), _value = -1; \
99 for (_byte = 0; _byte <= _stopbyte; ++_byte) \
100 if (_name[_byte] != 0xff) { \
101 _value = _byte << 3; \
102 for (_stopbyte = _name[_byte]; (_stopbyte&0x1); \
103 ++_value, _stopbyte >>= 1); \
110 #define bit_ffs(name, nbits, value) { \
111 register bitstr_t *_name = name; \
112 register int _byte, _nbits = nbits; \
113 register int _stopbyte = _bit_byte(_nbits), _value = -1; \
114 for (_byte = 0; _byte <= _stopbyte; ++_byte) \
115 if (_name[_byte]) { \
116 _value = _byte << 3; \
117 for (_stopbyte = _name[_byte]; !(_stopbyte&0x1); \
118 ++_value, _stopbyte >>= 1); \