test-hashes.c

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

unsigned fnv_hash(const char * str)
{
    unsigned hash = 2166136261u;
    unsigned i;
    for (i = 0u; str[i]; ++i)
        hash = (hash * 16777619u) ^ str[i];
    
    return hash;
}

unsigned gd_hash(const char * str)
{
    unsigned hash = 0u;
    unsigned i;
    for (i = 0u; str[i]; ++i)
      hash += (str[i] << ((i & 1) * 8));
    
    return hash;
}

char word[1024];

int main(int argc, char ** argv)
{
    if(argc == 1)
    {
        while(1)
        {
            fgets(word, sizeof(word), stdin);
            if(feof(stdin))
                break;
            
            if(strlen(word))
            {
                word[strlen(word) - 1] = '\0';
                printf("%u\n", gd_hash(word));
            }
        }
    }
    else
    {
         while(1)
        {
            fgets(word, sizeof(word), stdin);
            if(feof(stdin))
                break;
            
            if(strlen(word))
            {
                word[strlen(word) - 1] = '\0';
                printf("%u\n", fnv_hash(word));
            }
        }
    }
    return 0;
}