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