int hash(unsigned long key); 
 

1. key : 해쉬를 적용할 값
   
2. 리턴값 : key에 대한 해쉬값
   
   

#include <sys/socket.h> 
#include <netinet/in.h> 
#include <arpa/inet.h> 
#include "hash.h" 
 
int main() 
{ 
    printf("%d\n", hash(inet_addr("127.0.0.1"))); 
    printf("%d\n", hash(inet_addr("248.251.2.1"))); 
} 
 

 
#define HASH_SIZE   1024 
int hash(unsigned long key) 
{ 
    key += ~(key << 15); 
    key ^=  (key >> 10); 
    key +=  (key << 3); 
    key ^=  (key >> 6); 
    key += ~(key << 11); 
    key ^=  (key >> 16); 
    return key%HASH_SIZE; 
}