mouse smasher 1

#include <stdio.h>
#include <windows.h>
#define BUF_SIZE 256

#define MAX_SEP 50

LARGE_INTEGER freq, start;

double l = -1000, r = -2000; //time of last left or right presses

double t() //time in ms
{
    LARGE_INTEGER cur;
    QueryPerformanceCounter(&cur);
    double d = (double)(cur.QuadPart - start.QuadPart) / freq.QuadPart;
    //start = cur;
    return 1000 * d;
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch (msg) {
    case WM_CLOSE:
        PostQuitMessage(0);
        break;
    case WM_INPUT: {
        double tt = t();
        UINT dwSize;
        BYTE lpb[BUF_SIZE]; //too lazy to do properly (malloc/free)
        GetRawInputData((HRAWINPUT)lParam, RID_INPUT, NULL,
                &dwSize, sizeof(RAWINPUTHEADER));
        if (dwSize > BUF_SIZE) {
            printf("uh oh raw input data too large %d", dwSize);
            exit(1);
        }
        GetRawInputData((HRAWINPUT)lParam, RID_INPUT, lpb,
                &dwSize, sizeof(RAWINPUTHEADER));
        RAWINPUT* raw = (RAWINPUT*)lpb;
        if (raw->header.dwType == RIM_TYPEMOUSE) {
            int pressed = 0;
            if (raw->data.mouse.usButtonFlags &
                    RI_MOUSE_LEFT_BUTTON_DOWN) {
                l = tt;
                pressed = 1;
            }
            if (raw->data.mouse.usButtonFlags &
                    RI_MOUSE_RIGHT_BUTTON_DOWN) {
                r = tt;
                pressed = 1;
            }
            if (pressed && -MAX_SEP < l - r && l - r < MAX_SEP) {
                printf("%f\n", l - r);
                fflush(stdout);
            }
            /*
            printf("id:%X\tx:%d\ty:%d\tbtn:%04X\ttime:%f\n",
                    raw->header.hDevice,
                    raw->data.mouse.lLastX,
                    raw->data.mouse.lLastY,
                    raw->data.mouse.usButtonFlags,
                    t());fflush(stdout);
            */
        }
        break;
    }
    default:
        return DefWindowProc(hWnd, msg, wParam, lParam);
    }
    return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
            LPSTR lpCmdLine, int nCmdShow){
    MSG msg = {0};
    WNDCLASS wc = {0};
    wc.lpfnWndProc = WndProc;
    wc.hInstance = hInstance;
    wc.lpszClassName = "idkwhattonamethis";
    RegisterClass(&wc);
    HWND hWnd = CreateWindow(wc.lpszClassName, NULL, 0, 0, 0, 0, 0,
                    HWND_MESSAGE, NULL, hInstance, NULL);

    RAWINPUTDEVICE rid;
    rid.usUsagePage = 0x01;
    rid.usUsage = 0x02;
    rid.dwFlags = RIDEV_NOLEGACY | RIDEV_INPUTSINK;
    rid.hwndTarget = hWnd;
    RegisterRawInputDevices(&rid, 1, sizeof(rid));

    QueryPerformanceFrequency(&freq);
    //printf("timing precision: %f us", 1e6 / (double)freq.QuadPart);
    QueryPerformanceCounter(&start);

    while (GetMessage(&msg, NULL, 0, 0))
        DispatchMessage(&msg);

    return msg.wParam;
}