Qt to X11 keysym

#include "keysym.h" // from libvncserver

static const uint misc_keys[] =
{
    XK_Escape,
    XK_Tab,
    XK_Tab, //XK_ISO_Left_Tab
    XK_BackSpace,
    XK_Return,
    XK_KP_Enter,
    XK_Insert,
    XK_Delete,
    XK_Pause,
    XK_Print,
    XK_Sys_Req,
    XK_Clear,

    0, 0, 0, 0, // padding

    XK_Home,
    XK_End,
    XK_Left,
    XK_Up,
    XK_Right,
    XK_Down,
    XK_Page_Up,
    XK_Page_Down,

    0, 0, 0, 0, 0, 0, 0, 0, // padding

    XK_Shift_L,
    XK_Control_L,
    XK_Super_L,
    XK_Alt_L,
    XK_Caps_Lock,
    XK_Num_Lock,
    XK_Scroll_Lock,

    0, 0, 0, 0, 0, 0, 0, 0, 0, // padding

    XK_F1,
    XK_F2,
    XK_F3,
    XK_F4,
    XK_F5,
    XK_F6,
    XK_F7,
    XK_F8,
    XK_F9,
    XK_F10,
    XK_F11,
    XK_F12,
    XK_F13,
    XK_F14,
    XK_F15,
    XK_F16,
    XK_F17,
    XK_F18,
    XK_F19,
    XK_F20,
    XK_F21,
    XK_F22,
    XK_F23,
    XK_F24,
    XK_F25,

    0
};

static bool capslock_active = false;

unsigned int map_qt_to_x11(QKeyEvent *e)
{
    int k = e->key();
    Qt::KeyboardModifiers mod = e->modifiers();

    // check if LATIN-1
    if (k >= XK_space && k <= XK_ydiaeresis)
    {
        #define XOR(a, b) (!(a && b) && (a || b))

        // check if lowercase ascii
        if ((k >= XK_A && k <= XK_Z
        ||   k >= XK_Agrave && k <= XK_Thorn)
        && !(XOR(mod & Qt::ShiftModifier, capslock_active)))
            return k + 0x20;

        #undef XOR

        return k;
    }


    // check if misc key
    if (k >= 0x01000000 && k <= 0x01000048)
        return misc_keys[k - 0x01000000];

    return 0;
}