static void
sf_flush (SCM port)
{
scm_t_port *pt = SCM_PTAB_ENTRY (port);
SCM stream = SCM_PACK (pt->stream);
SCM f = SCM_SIMPLE_VECTOR_REF (stream, 2);
if (scm_is_true (f))
scm_call_0 (f);
}
static int
sf_input_waiting (SCM port)
{
SCM p = SCM_PACK (SCM_STREAM (port));
if (SCM_SIMPLE_VECTOR_LENGTH (p) >= 6)
{
SCM f = SCM_SIMPLE_VECTOR_REF (p, 5);
if (scm_is_true (f))
return scm_to_int (scm_call_0 (f));
}
/* Default is such that char-ready? for soft ports returns #t, as it
did before this extension was implemented. */
return 1;
}
void
scm_i_rehash (SCM table,
scm_t_hash_fn hash_fn,
void *closure,
const char* func_name)
{
SCM buckets, new_buckets;
int i;
unsigned long old_size;
unsigned long new_size;
if (SCM_HASHTABLE_N_ITEMS (table) < SCM_HASHTABLE_LOWER (table))
{
/* rehashing is not triggered when i <= min_size */
i = SCM_HASHTABLE (table)->size_index;
do
--i;
while (i > SCM_HASHTABLE (table)->min_size_index
&& SCM_HASHTABLE_N_ITEMS (table) < hashtable_size[i] / 4);
}
else
{
i = SCM_HASHTABLE (table)->size_index + 1;
if (i >= HASHTABLE_SIZE_N)
/* don't rehash */
return;
}
SCM_HASHTABLE (table)->size_index = i;
new_size = hashtable_size[i];
if (i <= SCM_HASHTABLE (table)->min_size_index)
SCM_HASHTABLE (table)->lower = 0;
else
SCM_HASHTABLE (table)->lower = new_size / 4;
SCM_HASHTABLE (table)->upper = 9 * new_size / 10;
buckets = SCM_HASHTABLE_VECTOR (table);
new_buckets = scm_c_make_vector (new_size, SCM_EOL);
SCM_SET_HASHTABLE_VECTOR (table, new_buckets);
SCM_SET_HASHTABLE_N_ITEMS (table, 0);
old_size = SCM_SIMPLE_VECTOR_LENGTH (buckets);
for (i = 0; i < old_size; ++i)
{
SCM ls, cell, handle;
ls = SCM_SIMPLE_VECTOR_REF (buckets, i);
SCM_SIMPLE_VECTOR_SET (buckets, i, SCM_EOL);
while (scm_is_pair (ls))
{
unsigned long h;
cell = ls;
handle = SCM_CAR (cell);
ls = SCM_CDR (ls);
h = hash_fn (SCM_CAR (handle), new_size, closure);
if (h >= new_size)
scm_out_of_range (func_name, scm_from_ulong (h));
SCM_SETCDR (cell, SCM_SIMPLE_VECTOR_REF (new_buckets, h));
SCM_SIMPLE_VECTOR_SET (new_buckets, h, cell);
SCM_HASHTABLE_INCREMENT (table);
}
}
}