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
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
static char rcsid[]="$Id$";
/*
* Copyright (C) 1996-8 Michael R. Elkins <me@cs.hmc.edu>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "mutt.h"
int hash_string (const unsigned char *s, int n)
{
int h = 0;
while (*s)
h += *s++;
return (h % n);
}
HASH *hash_create (int nelem)
{
HASH *table = safe_malloc (sizeof (HASH));
table->nelem = nelem;
table->table = safe_calloc (nelem, sizeof (struct hash_elem *));
return table;
}
/* table hash table to update
key key to hash on
data data to associate with `key'
allow_dup if nonzero, duplicate keys are allowed in the table */
int hash_insert (HASH * table, const char *key, void *data, int allow_dup)
{
struct hash_elem *ptr;
int h;
ptr = (struct hash_elem *) safe_malloc (sizeof (struct hash_elem));
h = hash_string ((unsigned char *) key, table->nelem);
ptr->key = key;
ptr->data = data;
if (allow_dup)
{
ptr->next = table->table[h];
table->table[h] = ptr;
}
else
{
struct hash_elem *tmp, *last;
int r;
for (tmp = table->table[h], last = NULL; tmp; last = tmp, tmp = tmp->next)
{
r = strcmp (tmp->key, key);
if (r == 0)
{
FREE (&ptr);
return (-1);
}
if (r > 0)
break;
}
if (last)
last->next = ptr;
else
table->table[h] = ptr;
ptr->next = tmp;
}
return h;
}
void *hash_find_hash (const HASH * table, int hash, const char *key)
{
struct hash_elem *ptr = table->table[hash];
for (; ptr; ptr = ptr->next)
{
if (strcmp (key, ptr->key) == 0)
return (ptr->data);
}
return NULL;
}
void hash_delete_hash (HASH * table, int hash, const char *key, const void *data,
void (*destroy) (void *))
{
struct hash_elem *ptr = table->table[hash];
struct hash_elem *last = NULL;
for (; ptr; last = ptr, ptr = ptr->next)
{
/* if `data' is given, look for a matching ->data member. this is
required for the case where we have multiple entries with the same
key */
if (data == ptr->data || (!data && strcmp (ptr->key, key) == 0))
{
if (last)
last->next = ptr->next;
else
table->table[hash] = ptr->next;
if (destroy)
destroy (ptr->data);
FREE (&ptr);
return;
}
}
}
/* ptr pointer to the hash table to be freed
destroy() function to call to free the ->data member (optional) */
void hash_destroy (HASH **ptr, void (*destroy) (void *))
{
int i;
HASH *pptr = *ptr;
struct hash_elem *elem, *tmp;
for (i = 0 ; i < pptr->nelem; i++)
{
for (elem = pptr->table[i]; elem; )
{
tmp = elem;
elem = elem->next;
if (destroy)
destroy (tmp->data);
safe_free ((void **) &tmp);
}
}
safe_free ((void **) &pptr->table);
safe_free ((void **) ptr);
}
|
