1 /*
2  * Copyright (C) 2012 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <search.h>
18 #include <stdlib.h>
19 
20 struct node_t {
21   char* key;
22   struct node* llink;
23   struct node* rlink;
24 };
25 
26 // Destroy a tree and free all allocated resources.
27 // This is a GNU extension, not available from BSD.
tdestroy(void * root,void (* destroy_func)(void *))28 void tdestroy(void* root, void (*destroy_func)(void*)) {
29   node_t* root_node = reinterpret_cast<node_t*>(root);
30   if (root_node == nullptr) {
31     return;
32   }
33   if (root_node->llink) {
34     tdestroy(root_node->llink, destroy_func);
35   }
36   if (root_node->rlink) {
37     tdestroy(root_node->rlink, destroy_func);
38   }
39   (*destroy_func)(root_node->key);
40   free(root);
41 }
42