/* Copy bits from bitset SRC to bitset DST. */
static inline void
tbitset_copy_ (bitset dst, bitset src)
{
if (src == dst)
return;
tbitset_zero (dst);
if (BITSET_NBITS_ (dst) != BITSET_NBITS_ (src))
tbitset_resize (dst, BITSET_NBITS_ (src));
tbitset_elts *selts = EBITSET_ELTS (src);
tbitset_elts *delts = EBITSET_ELTS (dst);
for (bitset_windex j = 0; j < EBITSET_SIZE (src); j++)
{
tbitset_elt *selt = selts[j];
if (selt)
{
tbitset_elt *tmp = tbitset_elt_alloc ();
delts[j] = tmp;
memcpy (EBITSET_WORDS (tmp), EBITSET_WORDS (selt),
sizeof (EBITSET_WORDS (selt)));
}
}
EBITSET_NONZERO_SET (dst);
}
static bitset_bindex
vbitset_resize (bitset src, bitset_bindex n_bits)
{
bitset_windex oldsize;
bitset_windex newsize;
if (n_bits == BITSET_NBITS_ (src))
return n_bits;
oldsize = VBITSET_SIZE (src);
newsize = VBITSET_N_WORDS (n_bits);
if (oldsize < newsize)
{
bitset_windex size;
/* The bitset needs to grow. If we already have enough memory
allocated, then just zero what we need. */
if (newsize > VBITSET_ASIZE (src))
{
/* We need to allocate more memory. When oldsize is
non-zero this means that we are changing the size, so
grow the bitset 25% larger than requested to reduce
number of reallocations. */
if (oldsize == 0)
size = newsize;
else
size = newsize + newsize / 4;
VBITSET_WORDS (src)
= realloc (VBITSET_WORDS (src), size * sizeof (bitset_word));
VBITSET_ASIZE (src) = size;
}
memset (VBITSET_WORDS (src) + oldsize, 0,
(newsize - oldsize) * sizeof (bitset_word));
VBITSET_SIZE (src) = newsize;
}
else
{
/* The bitset needs to shrink. There's no point deallocating
the memory unless it is shrinking by a reasonable amount. */
if ((oldsize - newsize) >= oldsize / 2)
{
VBITSET_WORDS (src)
= realloc (VBITSET_WORDS (src), newsize * sizeof (bitset_word));
VBITSET_ASIZE (src) = newsize;
}
/* Need to prune any excess bits. FIXME. */
VBITSET_SIZE (src) = newsize;
}
BITSET_NBITS_ (src) = n_bits;
return n_bits;
}
static bitset_bindex
lbitset_resize (bitset src, bitset_bindex size)
{
BITSET_NBITS_ (src) = size;
/* Need to prune any excess bits. FIXME. */
return size;
}