CoSQL/cosql_kv.c at master · Akash91/CoSQL · GitHub

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#include<string.h>
#include<stdlib.h>
#include "cosql_kv.h"

hash_table* init()
{
hash_table* tab;

tab = (hash_table*)malloc(sizeof(hash_table));
int i;
for(i = 0; i < TABLE_SIZE; i++)
tab->nodes[i] = NULL;
return tab;
}

void destroy(hash_table *tab)
{
int i; for(i = 0; i < TABLE_SIZE; i++)
{
if(tab->nodes[i])
{
free(tab->nodes[i]->key);
free(tab->nodes[i]);
}
}
free(tab);
tab = NULL;
}

int add(hash_table* tab,char* k, int v)
{
int hash = hash_func(k);

if(tab->nodes[hash] == NULL)
tab->nodes[hash] = malloc(sizeof(node));
else return 1;
tab->nodes[hash]->key = (char*)malloc(sizeof(char) * (strlen(k) + 1));
strcpy(tab->nodes[hash]->key,k);
tab->nodes[hash]->value = v;
return 0;
}

int find(hash_table* tab,char* key)
{
int hash = hash_func(key);
if(tab->nodes[hash] != NULL)
return tab->nodes[hash]->value;
else return -1;
}


unsigned int hash_func(char* k)
{
        unsigned int hash = 1;
        char* c;
	for(c = k; *c; c++)
        hash = *c+hash*31;

        return hash % TABLE_SIZE;
}