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/* Sequential list data type implemented by a hash table with a binary tree.
Copyright (C) 2006 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2006.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* Common code of gl_avltreehash_list.c and gl_rbtreehash_list.c. */
static gl_list_node_t
gl_tree_search_from_to (gl_list_t list, size_t start_index, size_t end_index,
const void *elt)
{
if (!(start_index <= end_index
&& end_index <= (list->root != NULL ? list->root->branch_size : 0)))
/* Invalid arguments. */
abort ();
{
size_t hashcode =
(list->base.hashcode_fn != NULL
? list->base.hashcode_fn (elt)
: (size_t)(uintptr_t) elt);
size_t index = hashcode % list->table_size;
gl_listelement_equals_fn equals = list->base.equals_fn;
gl_hash_entry_t entry;
if (list->base.allow_duplicates)
{
for (entry = list->table[index]; entry != NULL; entry = entry->hash_next)
if (entry->hashcode == hashcode)
{
if (((struct gl_multiple_nodes *) entry)->magic == MULTIPLE_NODES_MAGIC)
{
/* An entry representing multiple nodes. */
gl_oset_t nodes = ((struct gl_multiple_nodes *) entry)->nodes;
/* The first node is interesting. */
gl_list_node_t node = gl_oset_first (nodes);
if (equals != NULL ? equals (elt, node->value) : elt == node->value)
{
/* All nodes in the entry are equal to the given ELT. */
if (start_index == 0)
{
/* We have to return only the one at the minimal
position, and this is the first one in the ordered
set. */
if (end_index == list->root->branch_size
|| node_position (node) < end_index)
return node;
}
else
{
/* We have to return only the one at the minimal
position >= start_index. */
const void *elt;
if (gl_oset_search_atleast (nodes,
compare_position_threshold,
(void *)(uintptr_t)start_index,
&elt))
{
node = (gl_list_node_t) elt;
if (end_index == list->root->branch_size
|| node_position (node) < end_index)
return node;
}
}
break;
}
}
else
{
/* An entry representing a single node. */
gl_list_node_t node = (struct gl_list_node_impl *) entry;
if (equals != NULL ? equals (elt, node->value) : elt == node->value)
{
bool position_in_bounds;
if (start_index == 0 && end_index == list->root->branch_size)
position_in_bounds = true;
else
{
size_t position = node_position (node);
position_in_bounds =
(position >= start_index && position < end_index);
}
if (position_in_bounds)
return node;
break;
}
}
}
}
else
{
/* If no duplicates are allowed, multiple nodes are not needed. */
for (entry = list->table[index]; entry != NULL; entry = entry->hash_next)
if (entry->hashcode == hashcode)
{
gl_list_node_t node = (struct gl_list_node_impl *) entry;
if (equals != NULL ? equals (elt, node->value) : elt == node->value)
{
bool position_in_bounds;
if (start_index == 0 && end_index == list->root->branch_size)
position_in_bounds = true;
else
{
size_t position = node_position (node);
position_in_bounds =
(position >= start_index && position < end_index);
}
if (position_in_bounds)
return node;
break;
}
}
}
return NULL;
}
}
static size_t
gl_tree_indexof_from_to (gl_list_t list, size_t start_index, size_t end_index,
const void *elt)
{
gl_list_node_t node =
gl_tree_search_from_to (list, start_index, end_index, elt);
if (node != NULL)
return node_position (node);
else
return (size_t)(-1);
}
static void
gl_tree_list_free (gl_list_t list)
{
if (list->base.allow_duplicates)
{
/* Free the ordered sets in the hash buckets. */
size_t i;
for (i = list->table_size; i > 0; )
{
gl_hash_entry_t entry = list->table[--i];
while (entry != NULL)
{
gl_hash_entry_t next = entry->hash_next;
if (((struct gl_multiple_nodes *) entry)->magic == MULTIPLE_NODES_MAGIC)
{
gl_oset_t nodes = ((struct gl_multiple_nodes *) entry)->nodes;
gl_oset_free (nodes);
free (entry);
}
entry = next;
}
}
}
/* Iterate across all elements in post-order. */
{
gl_list_node_t node = list->root;
iterstack_t stack;
iterstack_item_t *stack_ptr = &stack[0];
for (;;)
{
/* Descend on left branch. */
for (;;)
{
if (node == NULL)
break;
stack_ptr->node = node;
stack_ptr->rightp = false;
node = node->left;
stack_ptr++;
}
/* Climb up again. */
for (;;)
{
if (stack_ptr == &stack[0])
goto done_iterate;
stack_ptr--;
node = stack_ptr->node;
if (!stack_ptr->rightp)
break;
/* Free the current node. */
free (node);
}
/* Descend on right branch. */
stack_ptr->rightp = true;
node = node->right;
stack_ptr++;
}
}
done_iterate:
free (list->table);
free (list);
}
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