xref: /curl/lib/splay.h (revision dcb51baf)
1 #ifndef HEADER_CURL_SPLAY_H
2 #define HEADER_CURL_SPLAY_H
3 /***************************************************************************
4  *                                  _   _ ____  _
5  *  Project                     ___| | | |  _ \| |
6  *                             / __| | | | |_) | |
7  *                            | (__| |_| |  _ <| |___
8  *                             \___|\___/|_| \_\_____|
9  *
10  * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
11  *
12  * This software is licensed as described in the file COPYING, which
13  * you should have received as part of this distribution. The terms
14  * are also available at https://curl.se/docs/copyright.html.
15  *
16  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17  * copies of the Software, and permit persons to whom the Software is
18  * furnished to do so, under the terms of the COPYING file.
19  *
20  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21  * KIND, either express or implied.
22  *
23  * SPDX-License-Identifier: curl
24  *
25  ***************************************************************************/
26 #include "curl_setup.h"
27 #include "timeval.h"
28 
29 /* only use function calls to access this struct */
30 struct Curl_tree {
31   struct Curl_tree *smaller; /* smaller node */
32   struct Curl_tree *larger;  /* larger node */
33   struct Curl_tree *samen;   /* points to the next node with identical key */
34   struct Curl_tree *samep;   /* points to the prev node with identical key */
35   struct curltime key;       /* this node's "sort" key */
36   void *ptr;                 /* data the splay code does not care about */
37 };
38 
39 struct Curl_tree *Curl_splay(struct curltime i,
40                              struct Curl_tree *t);
41 
42 struct Curl_tree *Curl_splayinsert(struct curltime key,
43                                    struct Curl_tree *t,
44                                    struct Curl_tree *newnode);
45 
46 struct Curl_tree *Curl_splaygetbest(struct curltime key,
47                                     struct Curl_tree *t,
48                                     struct Curl_tree **removed);
49 
50 int Curl_splayremove(struct Curl_tree *t,
51                      struct Curl_tree *removenode,
52                      struct Curl_tree **newroot);
53 
54 /* set and get the custom payload for this tree node */
55 void Curl_splayset(struct Curl_tree *node, void *payload);
56 void *Curl_splayget(struct Curl_tree *node);
57 
58 #endif /* HEADER_CURL_SPLAY_H */
59