void *avl_search(t_avl *const avl, void *val) {
if (!avl->hook_cmp) {
fprintf(stderr, "%s: Warning: no cmp hook defined. Using default comparators.\n", __FUNCTION__);
avl->hook_cmp = __default_hook_cmp;
}
return __search(avl, (t_node *)avl->root, val);
}
/* searching */
static void *__search(t_avl *const avl, t_node *const root, void *val) {
if (root == nil)
return NULL;
else if (!avl->hook_cmp(root->val, val))
return root->val;
else
return __search(avl, root->node[avl->hook_cmp(root->val, val) > 0], val);
}
static uint8_t
__search(BTree *tree, offset_t rootOffset, const uint8_t *key, int (*keyCompare)(const uint8_t *, const uint8_t *), offset_t *filePos)
{
uint8_t i;
BTreeNode *rootNode;
uint8_t result;
rootNode = btreeReadNode(tree, rootOffset);
if(NULL == rootNode)
{
sys_log(LOGSTDOUT, "error:__search: read node failed at offset %d\n", rootOffset);
return 0;
}
for (i = 0;
i < rootNode->keyCount && keyCompare(rootNode->keys[i], key) < 0;
i++)
;
if (BTREE_IS_LEAF(rootNode))
{
if (i < rootNode->keyCount && keyCompare(rootNode->keys[i], key) == 0)
{
*filePos = rootNode->children[i];
btreeDestroyNode(rootNode);
return 1;
}
sys_log(LOGSTDOUT, "error:__search: on leaf i = %d, keyCount %d\n", i, rootNode->keyCount);
btreeDestroyNode(rootNode);
return 0;
}
result = __search(tree, rootNode->children[i], key, keyCompare, filePos);
btreeDestroyNode(rootNode);
return result;
}
offset_t
btreeSearch(BTree *tree, const uint8_t *key, int (*keyCompare)(const uint8_t *, const uint8_t *))
{
offset_t filePos;
uint8_t found;
if (tree == NULL)
{
sys_log(LOGSTDOUT, "error:btreeSearch: tree is null\n");
return 0;
}
if (key == NULL)
{
sys_log(LOGSTDOUT, "error:btreeSearch: key is null\n");
return 0;
}
filePos = 0;
found = 0;
#if 0
/* Read in the tree data. */
tree->root = btreeGetRootNode(tree);
tree->leftLeaf = btreeGetLeftLeaf(tree);
#endif
sys_log(LOGSTDNULL, "[DEBUG] btreeSearch: tree %lx, root offset %d, left leaf offset %d\n", tree, tree->root, tree->leftLeaf);
if (btreeIsEmpty(tree) == 1)
{
sys_log(LOGSTDOUT, "error:btreeSearch: btree is empty\n");
return 0;
}
found = __search(tree, tree->root, key, keyCompare, &filePos);
if (found != 0)
{
return filePos;
}
sys_log(LOGSTDOUT, "error:btreeSearch: searched nothing\n");
return 0;
}
