bytes = size * sizeof (SBITMAP_ELT_TYPE);
amt = (sizeof (struct simple_bitmap_def)
+ bytes - sizeof (SBITMAP_ELT_TYPE));
- bmap = (sbitmap) xmalloc (amt);
+ bmap = xmalloc (amt);
bmap->n_bits = n_elms;
bmap->size = size;
bmap->bytes = bytes;
{
amt = (sizeof (struct simple_bitmap_def)
+ bytes - sizeof (SBITMAP_ELT_TYPE));
- bmap = (sbitmap) xrealloc (bmap, amt);
+ bmap = xrealloc (bmap, amt);
}
if (n_elms > bmap->n_bits)
return bmap;
}
+/* Re-allocate a simple bitmap of N_ELMS bits. New storage is uninitialized. */
+
+sbitmap
+sbitmap_realloc (sbitmap src, unsigned int n_elms)
+{
+ unsigned int bytes, size, amt;
+ sbitmap bmap;
+
+ size = SBITMAP_SET_SIZE (n_elms);
+ bytes = size * sizeof (SBITMAP_ELT_TYPE);
+ amt = (sizeof (struct simple_bitmap_def)
+ + bytes - sizeof (SBITMAP_ELT_TYPE));
+
+ if (src->bytes >= bytes)
+ {
+ src->n_bits = n_elms;
+ return src;
+ }
+
+ bmap = (sbitmap) xrealloc (src, amt);
+ bmap->n_bits = n_elms;
+ bmap->size = size;
+ bmap->bytes = bytes;
+ return bmap;
+}
+
/* Allocate a vector of N_VECS bitmaps of N_ELMS bits. */
sbitmap *
}
amt = vector_bytes + (n_vecs * elm_bytes);
- bitmap_vector = (sbitmap *) xmalloc (amt);
+ bitmap_vector = xmalloc (amt);
for (i = 0, offset = vector_bytes; i < n_vecs; i++, offset += elm_bytes)
{
unsigned int i, n = dst->size;
sbitmap_ptr dstp = dst->elms;
sbitmap_ptr srcp = src->elms;
+ unsigned int last_bit;
for (i = 0; i < n; i++)
*dstp++ = ~*srcp++;
+
+ /* Zero all bits past n_bits, by ANDing dst with sbitmap_ones. */
+ last_bit = src->n_bits % SBITMAP_ELT_BITS;
+ if (last_bit)
+ dst->elms[n-1] = dst->elms[n-1]
+ & ((SBITMAP_ELT_TYPE)-1 >> (SBITMAP_ELT_BITS - last_bit));
}
/* Set the bits in DST to be the difference between the bits
for (i = 0; i < n; i++)
{
SBITMAP_ELT_TYPE tmp = *ap++ & *bp++;
- changed = *dstp ^ tmp;
+ changed |= *dstp ^ tmp;
*dstp++ = tmp;
}
for (i = 0; i < n; i++)
{
SBITMAP_ELT_TYPE tmp = *ap++ ^ *bp++;
- changed = *dstp ^ tmp;
+ changed |= *dstp ^ tmp;
*dstp++ = tmp;
}
for (i = 0; i < n; i++)
{
SBITMAP_ELT_TYPE tmp = *ap++ | *bp++;
- changed = *dstp ^ tmp;
+ changed |= *dstp ^ tmp;
*dstp++ = tmp;
}