projects / mirror_frr.git / blame
| Commit | Line | Data |
|---|---|---|
| 718e3744 | 1 | /* Hash routine. |
| 896014f4 DL |
2 | * Copyright (C) 1998 Kunihiro Ishiguro |
| 3 | * | |
| 4 | * This file is part of GNU Zebra. | |
| 5 | * | |
| 6 | * GNU Zebra is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License as published | |
| 8 | * by the Free Software Foundation; either version 2, or (at your | |
| 9 | * option) any later version. | |
| 10 | * | |
| 11 | * GNU Zebra is distributed in the hope that it will be useful, but | |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | * General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU General Public License along | |
| 17 | * with this program; see the file COPYING; if not, write to the Free Software | |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
| 19 | */ | |
| 718e3744 | 20 | |
| 21 | #ifndef _ZEBRA_HASH_H | |
| 22 | #define _ZEBRA_HASH_H | |
| 23 | ||
| 4a1ab8e4 DL |
24 | #include "memory.h" |
| 25 | ||
| 26 | DECLARE_MTYPE(HASH) | |
| 27 | DECLARE_MTYPE(HASH_BACKET) | |
| 28 | ||
| 718e3744 | 29 | /* Default hash table size. */ |
| 97c84db0 SH |
30 | #define HASH_INITIAL_SIZE 256 /* initial number of backets. */ |
| 31 | #define HASH_THRESHOLD 10 /* expand when backet. */ | |
| 718e3744 | 32 | |
| 3f9c7369 DS |
33 | #define HASHWALK_CONTINUE 0 |
| 34 | #define HASHWALK_ABORT -1 | |
| 35 | ||
| 718e3744 | 36 | struct hash_backet |
| 37 | { | |
| 38 | /* Linked list. */ | |
| 39 | struct hash_backet *next; | |
| 40 | ||
| 41 | /* Hash key. */ | |
| 42 | unsigned int key; | |
| 43 | ||
| 44 | /* Data. */ | |
| 45 | void *data; | |
| 46 | }; | |
| 47 | ||
| 48 | struct hash | |
| 49 | { | |
| 50 | /* Hash backet. */ | |
| 51 | struct hash_backet **index; | |
| 52 | ||
| 90645f55 | 53 | /* Hash table size. Must be power of 2 */ |
| 718e3744 | 54 | unsigned int size; |
| 55 | ||
| 97c84db0 SH |
56 | /* If expansion failed. */ |
| 57 | int no_expand; | |
| 58 | ||
| 718e3744 | 59 | /* Key make function. */ |
| 8cc4198f | 60 | unsigned int (*hash_key) (void *); |
| 718e3744 | 61 | |
| 62 | /* Data compare function. */ | |
| ffe11cfb | 63 | int (*hash_cmp) (const void *, const void *); |
| 718e3744 | 64 | |
| 65 | /* Backet alloc. */ | |
| 66 | unsigned long count; | |
| 67 | }; | |
| 68 | ||
| 8cc4198f | 69 | extern struct hash *hash_create (unsigned int (*) (void *), |
| ffe11cfb | 70 | int (*) (const void *, const void *)); |
| 8cc4198f | 71 | extern struct hash *hash_create_size (unsigned int, unsigned int (*) (void *), |
| 24873f0c | 72 | int (*) (const void *, const void *)); |
| 718e3744 | 73 | |
| 8cc4198f | 74 | extern void *hash_get (struct hash *, void *, void * (*) (void *)); |
| 75 | extern void *hash_alloc_intern (void *); | |
| 76 | extern void *hash_lookup (struct hash *, void *); | |
| 77 | extern void *hash_release (struct hash *, void *); | |
| 718e3744 | 78 | |
| 8cc4198f | 79 | extern void hash_iterate (struct hash *, |
| 718e3744 | 80 | void (*) (struct hash_backet *, void *), void *); |
| 81 | ||
| 3f9c7369 DS |
82 | extern void hash_walk (struct hash *, |
| 83 | int (*) (struct hash_backet *, void *), void *); | |
| 84 | ||
| 8cc4198f | 85 | extern void hash_clean (struct hash *, void (*) (void *)); |
| 86 | extern void hash_free (struct hash *); | |
| 718e3744 | 87 | |
| 6392aa83 SH |
88 | extern unsigned int string_hash_make (const char *); |
| 89 | ||
| 718e3744 | 90 | #endif /* _ZEBRA_HASH_H */ |