4 * (c) 2003 Martin Mares <mj@ucw.cz>
6 * This software may be freely distributed and used according to the terms
7 * of the GNU Lesser General Public License.
12 typedef u32 *bitarray_t;
13 #define BIT_ARRAY_WORDS(n) (((n)+31)/32)
14 #define BIT_ARRAY(name,size) u32 name[BIT_ARRAY_WORDS(size)]
17 bit_array_zero(bitarray_t a, uns n)
19 bzero(a, 4*BIT_ARRAY_WORDS(n));
23 bit_array_set(bitarray_t a, uns i)
25 a[i/32] |= (1 << (i%32));
29 bit_array_clear(bitarray_t a, uns i)
31 a[i/32] &= ~(1 << (i%32));
35 bit_array_isset(bitarray_t a, uns i)
37 return a[i/32] & (1 << (i%32));
41 bit_array_get(bitarray_t a, uns i)
43 return !! bit_array_isset(a, i);
47 bit_array_test_and_set(bitarray_t a, uns i)
49 uns t = bit_array_isset(a, i);
55 bit_array_test_and_clear(bitarray_t a, uns i)
57 uns t = bit_array_isset(a, i);
58 bit_array_clear(a, i);
62 /* Iterate over all set bits, possibly destructively */
63 #define BIT_ARRAY_FISH_BITS_BEGIN(var,ary,size) \
64 for (uns var##_hi=0; var##_hi < BIT_ARRAY_WORDS(size); var##_hi++) \
65 for (uns var##_lo=0; ary[var##_hi]; var##_lo++) \
66 if (ary[var##_hi] & (1 << var##_lo)) \
68 uns var = 32*var##_hi + var##_lo; \
69 ary[var##_hi] &= ~(1 << var##_lo); \
72 #define BIT_ARRAY_FISH_BITS_END \