distributed_database/utils.c at main · Alexh1972/distributed_database · GitHub

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/*
 * Copyright (c) 2024, <>
 */

#include "utils.h"

unsigned int hash_uint(void *key)
{
    unsigned int uint_key = *((unsigned int *)key);

    uint_key = ((uint_key >> 16u) ^ uint_key) * 0x45d9f3b;
    uint_key = ((uint_key >> 16u) ^ uint_key) * 0x45d9f3b;
    uint_key = (uint_key >> 16u) ^ uint_key;

    return uint_key;
}

unsigned int hash_string(void *key)
{
    unsigned char *key_string = (unsigned char *)key;
    unsigned int hash = 5381;
    int c;

    while ((c = *key_string++))
        hash = ((hash << 5u) + hash) + c;

    return hash;
}

char *get_request_type_str(request_type req_type)
{
    switch (req_type)
    {
    case ADD_SERVER:
        return ADD_SERVER_REQUEST;
    case REMOVE_SERVER:
        return REMOVE_SERVER_REQUEST;
    case EDIT_DOCUMENT:
        return EDIT_REQUEST;
    case GET_DOCUMENT:
        return GET_REQUEST;
    }

    return NULL;
}

request_type get_request_type(char *request_type_str)
{
    request_type type;

    if (!strncmp(request_type_str,
                 ADD_SERVER_REQUEST, strlen(ADD_SERVER_REQUEST)))
        type = ADD_SERVER;
    else if (!strncmp(request_type_str,
                      REMOVE_SERVER_REQUEST, strlen(REMOVE_SERVER_REQUEST)))
        type = REMOVE_SERVER;
    else if (!strncmp(request_type_str,
                      EDIT_REQUEST, strlen(EDIT_REQUEST)))
        type = EDIT_DOCUMENT;
    else if (!strncmp(request_type_str,
                      GET_REQUEST, strlen(GET_REQUEST)))
        type = GET_DOCUMENT;
    else
        DIE(1, "unknown request type");

    return type;
}

int compare_strings(void *st1, void *st2)
{
    return strcmp(st1, st2);
}

char *strdup(const char *src)
{
    char *dst = malloc(strlen(src) + 1);
    if (dst == NULL)
        return NULL;
    strcpy(dst, src);
    return dst;
}

unsigned int number_digits(unsigned int number)
{
    unsigned int c = 0;
    while (number)
    {
        c++;
        number /= 10;
    }
    return c;
}