various hash algorithms in c

djb2.c

#include <stdint.h>

uint32_t hash_djb2(unsigned char *str) {
    uint32_t hash = 5381;
    uint32_t c;

    while ((c = *str++))
        hash = ((hash << 5) + hash) + c; /* hash * 33 + c */

    return hash;
}

djb2_xor.c

#include <stdint.h>

uint32_t hash_djb2_xor(unsigned char *str) {
    uint32_t hash = 5381;
    uint32_t c;

    while ((c = *str++))
        hash = ((hash << 5) + hash) ^ c; /* (hash * 33) ^ c */

    return hash;
}