1/* ternary.h - Ternary Search Trees
2   Copyright 2001 Free Software Foundation, Inc.
3
4   Contributed by Daniel Berlin (dan@cgsoftware.com)
5
6
7   This program is free software; you can redistribute it and/or modify it
8   under the terms of the GNU General Public License as published by the
9   Free Software Foundation; either version 2, or (at your option) any
10   later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program; if not, write to the Free Software
19   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
20   USA.  */
21#ifndef TERNARY_H_
22#define TERNARY_H_
23/* Ternary search trees */
24
25typedef struct ternary_node_def *ternary_tree;
26
27typedef struct ternary_node_def
28{
29  char splitchar;
30  ternary_tree lokid;
31  ternary_tree eqkid;
32  ternary_tree hikid;
33}
34ternary_node;
35
36/* Insert string S into tree P, associating it with DATA.
37   Return the data in the tree associated with the string if it's
38   already there, and replace is 0.
39   Otherwise, replaces if it it exists, inserts if it doesn't, and
40   returns the data you passed in. */
41void *ternary_insert (ternary_tree *p, const char *s,
42		      void *data, int replace);
43
44/* Delete the ternary search tree rooted at P.
45   Does NOT delete the data you associated with the strings. */
46void ternary_cleanup (ternary_tree p);
47
48/* Search the ternary tree for string S, returning the data associated
49   with it if found. */
50void *ternary_search (const ternary_node *p, const char *s);
51#endif
52