| 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| 20 | USA. */ |
| 21 | #ifndef TERNARY_H_ |
| 22 | #define TERNARY_H_ |
| 23 | /* Ternary search trees */ |
| 24 | |
| 25 | typedef struct ternary_node_def *ternary_tree; |
| 26 | |
| 27 | typedef struct ternary_node_def |
| 28 | { |
| 29 | char splitchar; |
| 30 | ternary_tree lokid; |
| 31 | ternary_tree eqkid; |
| 32 | ternary_tree hikid; |
| 33 | } |
| 34 | ternary_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. */ |
| 41 | PTR ternary_insert PARAMS ((ternary_tree *p, const char *s, |
| 42 | PTR data, int replace)); |
| 43 | |
| 44 | /* Delete the ternary search tree rooted at P. |
| 45 | Does NOT delete the data you associated with the strings. */ |
| 46 | void ternary_cleanup PARAMS ((ternary_tree p)); |
| 47 | |
| 48 | /* Search the ternary tree for string S, returning the data associated |
| 49 | with it if found. */ |
| 50 | PTR ternary_search PARAMS ((const ternary_node *p, const char *s)); |
| 51 | #endif |