forked from luck/tmp_suning_uos_patched
719a2f8e5f
This patch changes hashtab.c to fix whitespace and syntax issues. Things that are fixed may include (does not not have to include) whitespace at end of lines spaces followed by tabs spaces used instead of tabs spacing around parenthesis locateion of { around struct and else clauses location of * in pointer declarations removal of initialization of static data to keep it in the right section useless {} in if statemetns useless checking for NULL before kfree fixing of the indentation depth of switch statements and any number of other things I forgot to mention Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
166 lines
2.9 KiB
C
166 lines
2.9 KiB
C
/*
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* Implementation of the hash table type.
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*
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* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include "hashtab.h"
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struct hashtab *hashtab_create(u32 (*hash_value)(struct hashtab *h, const void *key),
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int (*keycmp)(struct hashtab *h, const void *key1, const void *key2),
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u32 size)
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{
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struct hashtab *p;
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u32 i;
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (p == NULL)
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return p;
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p->size = size;
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p->nel = 0;
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p->hash_value = hash_value;
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p->keycmp = keycmp;
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p->htable = kmalloc(sizeof(*(p->htable)) * size, GFP_KERNEL);
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if (p->htable == NULL) {
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kfree(p);
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return NULL;
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}
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for (i = 0; i < size; i++)
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p->htable[i] = NULL;
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return p;
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}
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int hashtab_insert(struct hashtab *h, void *key, void *datum)
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{
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u32 hvalue;
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struct hashtab_node *prev, *cur, *newnode;
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if (!h || h->nel == HASHTAB_MAX_NODES)
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return -EINVAL;
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hvalue = h->hash_value(h, key);
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prev = NULL;
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cur = h->htable[hvalue];
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while (cur && h->keycmp(h, key, cur->key) > 0) {
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prev = cur;
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cur = cur->next;
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}
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if (cur && (h->keycmp(h, key, cur->key) == 0))
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return -EEXIST;
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newnode = kzalloc(sizeof(*newnode), GFP_KERNEL);
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if (newnode == NULL)
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return -ENOMEM;
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newnode->key = key;
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newnode->datum = datum;
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if (prev) {
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newnode->next = prev->next;
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prev->next = newnode;
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} else {
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newnode->next = h->htable[hvalue];
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h->htable[hvalue] = newnode;
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}
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h->nel++;
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return 0;
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}
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void *hashtab_search(struct hashtab *h, const void *key)
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{
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u32 hvalue;
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struct hashtab_node *cur;
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if (!h)
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return NULL;
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hvalue = h->hash_value(h, key);
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cur = h->htable[hvalue];
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while (cur != NULL && h->keycmp(h, key, cur->key) > 0)
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cur = cur->next;
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if (cur == NULL || (h->keycmp(h, key, cur->key) != 0))
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return NULL;
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return cur->datum;
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}
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void hashtab_destroy(struct hashtab *h)
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{
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u32 i;
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struct hashtab_node *cur, *temp;
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if (!h)
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return;
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for (i = 0; i < h->size; i++) {
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cur = h->htable[i];
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while (cur != NULL) {
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temp = cur;
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cur = cur->next;
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kfree(temp);
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}
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h->htable[i] = NULL;
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}
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kfree(h->htable);
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h->htable = NULL;
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kfree(h);
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}
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int hashtab_map(struct hashtab *h,
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int (*apply)(void *k, void *d, void *args),
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void *args)
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{
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u32 i;
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int ret;
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struct hashtab_node *cur;
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if (!h)
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return 0;
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for (i = 0; i < h->size; i++) {
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cur = h->htable[i];
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while (cur != NULL) {
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ret = apply(cur->key, cur->datum, args);
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if (ret)
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return ret;
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cur = cur->next;
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}
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}
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return 0;
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}
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void hashtab_stat(struct hashtab *h, struct hashtab_info *info)
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{
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u32 i, chain_len, slots_used, max_chain_len;
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struct hashtab_node *cur;
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slots_used = 0;
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max_chain_len = 0;
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for (slots_used = max_chain_len = i = 0; i < h->size; i++) {
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cur = h->htable[i];
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if (cur) {
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slots_used++;
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chain_len = 0;
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while (cur) {
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chain_len++;
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cur = cur->next;
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}
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if (chain_len > max_chain_len)
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max_chain_len = chain_len;
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}
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}
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info->slots_used = slots_used;
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info->max_chain_len = max_chain_len;
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}
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