ngx_hash.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

typedef uintptr_t   ngx_uint_t;

#define ngx_tolower(c)      (u_char) ((c >= 'A' && c <= 'Z') ? (c | 0x20) : c)
#define ngx_hash(key, c)    ((ngx_uint_t) key * 31 + c)

/* hash-function from nginx as is */
ngx_uint_t
ngx_hash_key_lc(u_char *data, size_t len)
{
    ngx_uint_t  i, key;

    key = 0;

    for (i = 0; i < len; i++) {
        key = ngx_hash(key, ngx_tolower(data[i]));
    }

    return key;
}

int main(int argc, char *argv[]) {
    uint key = 0;

    if (argc > 1) {
        key = (uint) ngx_hash_key_lc((u_char *) argv[1], strlen(argv[1]));
    }

    if (argc == 2) { // Return hash key
        printf("%u\n", key);

        return 0;
    }

    if (argc == 3) { // Return remainder
        printf("%u\n", key % atoi(argv[2]));

        return 0;
    }

    printf("Error: %s should have one or two arguments.\n\n", argv[0]);
    printf("Usage: %s <string> [divisor]\n\n", argv[0]);
    return 1;
}

ngx_hash.json

{
  "": 0,
  " ": 32,
  "o": 111,
  "o": 111,
  "8R": 1850,
  "RzQX": 3517039,
  "qAdPI3Fq": 2527113169,
  "00q8lYVWBOOugKmK": 2698177386,
  "EtexacF7jIc2GS73JDdgeMAmUqt84BJg": 4120059431,
  "EtexacF7jIc2GS73JDdgeMAmUqt84BJg": 4120059431,
  "Y1ydzz9QIWpUaIK4KvavJ4I5IBE6bWlP5JzywR6CkfNwLwiDt4yj8S3x3HHn9dNB": 2873098985,
  "WYYi8T0j4WgdnX43iFvSVGF2jjIFBJrY7TqqhKB3aovbPsuflT20FgMIETmFkaROgRf1wopLwthanGIjKDDWohe4oE4GyNSn5LyiQibUQlafyHCX07Eao3hxWkZhmunO": 698697744,
  "mUIoM7Aj6cYtA8JiBKPqlkASX9apzhu9beXHYvtQ5N2S8GLD03B24UDn1Uqj8neKyloV72tE7esaJJv1OuuhvoWLz1a02VZnyA6frFevQ5JGjnER9czkd72lD3vL02gGA8E0lUyR08pJaly3wEsFrDJIUd0IPROOCTa2PPD5W118hMBwICIEEtiqJKBqZe6w1taUGgsXSIPHvn2BaoZ0lgMpNFF1jezdfz0flN336tEr4O4Am6TxNWtk7yI4GhIi4y8ymmVwinqhpg4D": 2016586975,
  "0": 48,
  "2": 50,
  "2": 50,
  "41": 1661,
  "7312": 1689085,
  "089110": 1427663167,
  "26281363": 3406414569,
  "7835407648": 3955229922,
  "687504006167": 3977578720,
  "40459490929208": 4022016297,
  "0351006781232188": 2348588185,
  "190135620096532713": 1781501865,
  "1901356200965327131": 3686950312,
  "19013562009653271311": 2626310025,
  "3187359476680349621918278854529790319177": 4164541658,
  "953737784211811509779320943881345589292943205013887462319416": 3753440891,
  "50533748625943387371182828580323161439313733678329198330229997677262253695289743": 431502339,
  "31454302632311981083034899088763577388746655861705256870440658994643773100576593885749937143160990077114828197716765516190522438228450471188232187560636686872030557541262182078314687012911564703597807906040941973299671703363754942713882026192417344257674409648534079795905": 1037621883
}