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/*
SSSD
Service monitor
Copyright (C) Stephen Gallagher 2008
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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
*/
#include "talloc.h"
#include "util/btreemap.h"
#include "util/util.h"
struct btreemap
{
/* NULL keys are not allowed */
const void *key;
/* NULL values are permitted */
void *value;
struct btreemap *left;
struct btreemap *right;
/* comparator must return -1, 0 or 1
* and should only be set for the root node
* other nodes will be ignored.
*/
btreemap_comparison_fn comparator;
};
/* btreemap_search_key
* Searches a btreemap for an entry with a specific key
* If found, it will return BTREEMAP_FOUND and node will
* be set to the appropriate node.
* If not found, it will set the following:
* BTREEMAP_EMPTY: The map was empty, create a new map when adding keys
* BTREEMAP_CREATE_LEFT: A new node created should use node->left
* BTREEMAP_CREATE_RIGHT: A new node created should use node->right
*/
int btreemap_search_key(struct btreemap *map, const void *key, struct btreemap **node)
{
struct btreemap *tempnode;
int result;
int found = BTREEMAP_EMPTY;
if (!map)
{
*node = NULL;
return BTREEMAP_EMPTY;
}
tempnode = map;
while (found == BTREEMAP_EMPTY) {
result = tempnode->comparator(tempnode->key, key);
if (result > 0)
{
if (tempnode->right)
tempnode=tempnode->right;
else
{
found = BTREEMAP_CREATE_RIGHT;
}
} else if (result < 0)
{
if (tempnode->left)
tempnode=tempnode->left;
else
{
found = BTREEMAP_CREATE_LEFT;
}
} else
{
/* This entry matched */
found = BTREEMAP_FOUND;
}
}
*node = tempnode;
return found;
}
void *btreemap_get_value(struct btreemap *map, const void *key)
{
struct btreemap *node;
int found;
if (!map || !key)
{
return NULL;
}
/* Search for the key */
found = btreemap_search_key(map, key, &node);
if (found == 0)
{
return node->value;
}
/* If the key was not found, return NULL */
return NULL;
}
/* Keys and values must be talloc contexts
* comparator must return -1, 0 or 1
*/
int btreemap_set_value(TALLOC_CTX *mem_ctx,
struct btreemap **map, const void *key, void *value,
btreemap_comparison_fn comparator)
{
struct btreemap *node;
struct btreemap *new_node;
int found;
if (!key)
{
return EINVAL;
}
/* Search for the key */
found = btreemap_search_key(*map, key, &node);
if (found == BTREEMAP_FOUND)
{
/* Update existing value */
node->value = value;
return EOK;
}
/* Need to add a value to the tree */
new_node = talloc_zero(mem_ctx, struct btreemap);
if (!new_node)
{
return ENOMEM;
}
new_node->key = talloc_steal(new_node, key);
new_node->value = talloc_steal(new_node, value);
new_node->comparator = comparator;
if (found == BTREEMAP_EMPTY)
{
*map = new_node;
}
if (found == BTREEMAP_CREATE_LEFT)
{
node->left = new_node;
} else if (found == BTREEMAP_CREATE_RIGHT)
{
node->right = new_node;
}
return EOK;
}
/* Return an array of keys in sort order
* count should be initialized to zero before calling this function.
*/
void btreemap_get_keys(TALLOC_CTX *mem_ctx, struct btreemap *map, const void ***array, int *count)
{
if (map == NULL) return;
/* Left Node */
btreemap_get_keys(mem_ctx, map->left, array, count);
/* Current Node */
(*count)++;
*array = talloc_realloc(mem_ctx, *array, const void *, *count);
(*array)[(*count)-1] = map->key;
/* Right Node */
btreemap_get_keys(mem_ctx, map->right, array, count);
}
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