#define WIN32_LEAN_AND_MEAN 1
#define _CRT_SECURE_NO_WARNINGS 1

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

#define LIMIT 999999U

static void test1(void)
{
    FILE *file = fopen("C:\\Temp\\test1.out", "wb");
    if (!file)
    {
        abort();
    }

    for (size_t i = 0; i < LIMIT; ++i)
    {
        uint8_t buffer = i % 256U;
        if (fwrite(&buffer, sizeof(uint8_t), 1U, file) != 1U)
        {
            abort();
        }
    }

    fclose(file);
}

static void test2(void)
{
    HANDLE h = CreateFileA("C:\\Temp\\test2.out", GENERIC_WRITE, 0U, NULL, CREATE_ALWAYS, 0U, NULL);
    if (h == INVALID_HANDLE_VALUE)
    {
        abort();
    }

    for (size_t i = 0; i < LIMIT; ++i)
    {
        uint8_t buffer = i % 256U;
        DWORD written;
        if (!WriteFile(h, &buffer, 1U, &written, NULL))
        {
            abort();
        }
        if (written != 1U)
        {
            abort();
        }
    }

    CloseHandle(h);
}

int main()
{
    for (int i = 0; i < 3; ++i)
    {
        const clock_t a = clock();
        test1();
        const clock_t b = clock();
        test2();
        const clock_t c = clock();

        printf("stdio: %lu\n", b - a);
        printf("win32: %lu (x%.f)\n", c - b, (c - b) / ((double)(b - a)));
        puts("");
    }
}