位操作哈希 rotate_hash

#include<stdio.h>
#include<string.h>
#include <stdlib.h>
#include <stdint.h>

uint32_t rotate_hash(char *key, uint32_t len, uint32_t mask)
{
uint32_t hash, i;
for (hash=0, i=0; i<len; ++i)
hash = (hash<<5)^(hash>>27)^key[i];
return hash = (hash ^ (hash>>10) ^ (hash>>20)) & mask; // replace (hash % prime);
}

int main(int argc, char **argv)
{
char name[1024];
int init =0;
if(argc == 2) {
init = atoi(argv[1]);
}
while(gets(name)>0){
int len = strlen(name);
printf("%u\n",rotate_hash(name, len, 0xffffffff));
}
return 0;
}