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60 lines
1.2 KiB
60 lines
1.2 KiB
3 months ago
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/*
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* UCW Library -- Support routines for bitarray
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*
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* (c) 2012 Pavel Charvat <pchar@ucw.cz>
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* (c) 2013 Martin Mares <mj@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/bitops.h>
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#include <ucw/bitarray.h>
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uint bit_array_count_bits(bitarray_t a, uint n)
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{
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uint m = 0;
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n = BIT_ARRAY_WORDS(n);
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while (n--)
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m += bit_count(*a++);
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return m;
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}
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bitarray_t bit_array_xrealloc(bitarray_t a, uint old_n, uint new_n)
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{
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uint old_bytes = BIT_ARRAY_BYTES(old_n);
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uint new_bytes = BIT_ARRAY_BYTES(new_n);
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if (old_bytes == new_bytes)
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return a;
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a = xrealloc(a, new_bytes);
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if (old_bytes < new_bytes)
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bzero(a + old_bytes, new_bytes - old_bytes);
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return a;
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}
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#ifdef TEST
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#include <stdio.h>
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#include <alloca.h>
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int main(void)
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{
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char buf[1024];
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bitarray_t a = alloca(BIT_ARRAY_BYTES(sizeof(buf)));
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while (1)
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{
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if (!fgets(buf, sizeof(buf), stdin))
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return 0;
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uint n;
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for (n = 0; buf[n] == '0' || buf[n] == '1'; n++);
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bit_array_zero(a, n);
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for (uint i = 0; i < n; i++)
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if (buf[i] == '1')
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bit_array_set(a, i);
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printf("%u\n", bit_array_count_bits(a, n));
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}
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}
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#endif
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