2 * Implementation of the hash table type.
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
6 #include <linux/kernel.h>
7 #include <linux/slab.h>
8 #include <linux/errno.h>
11 struct hashtab *hashtab_create(u32 (*hash_value)(struct hashtab *h, void *key),
12 int (*keycmp)(struct hashtab *h, void *key1, void *key2),
18 p = kmalloc(sizeof(*p), GFP_KERNEL);
22 memset(p, 0, sizeof(*p));
25 p->hash_value = hash_value;
27 p->htable = kmalloc(sizeof(*(p->htable)) * size, GFP_KERNEL);
28 if (p->htable == NULL) {
33 for (i = 0; i < size; i++)
39 int hashtab_insert(struct hashtab *h, void *key, void *datum)
42 struct hashtab_node *prev, *cur, *newnode;
44 if (!h || h->nel == HASHTAB_MAX_NODES)
47 hvalue = h->hash_value(h, key);
49 cur = h->htable[hvalue];
50 while (cur && h->keycmp(h, key, cur->key) > 0) {
55 if (cur && (h->keycmp(h, key, cur->key) == 0))
58 newnode = kmalloc(sizeof(*newnode), GFP_KERNEL);
61 memset(newnode, 0, sizeof(*newnode));
63 newnode->datum = datum;
65 newnode->next = prev->next;
68 newnode->next = h->htable[hvalue];
69 h->htable[hvalue] = newnode;
76 void *hashtab_search(struct hashtab *h, void *key)
79 struct hashtab_node *cur;
84 hvalue = h->hash_value(h, key);
85 cur = h->htable[hvalue];
86 while (cur != NULL && h->keycmp(h, key, cur->key) > 0)
89 if (cur == NULL || (h->keycmp(h, key, cur->key) != 0))
95 void hashtab_destroy(struct hashtab *h)
98 struct hashtab_node *cur, *temp;
103 for (i = 0; i < h->size; i++) {
105 while (cur != NULL) {
119 int hashtab_map(struct hashtab *h,
120 int (*apply)(void *k, void *d, void *args),
125 struct hashtab_node *cur;
130 for (i = 0; i < h->size; i++) {
132 while (cur != NULL) {
133 ret = apply(cur->key, cur->datum, args);
143 void hashtab_stat(struct hashtab *h, struct hashtab_info *info)
145 u32 i, chain_len, slots_used, max_chain_len;
146 struct hashtab_node *cur;
150 for (slots_used = max_chain_len = i = 0; i < h->size; i++) {
160 if (chain_len > max_chain_len)
161 max_chain_len = chain_len;
165 info->slots_used = slots_used;
166 info->max_chain_len = max_chain_len;