// Match what curses returns.
    enum function_keys
    {
        F1 = 265,
        F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12, F13, F14, F15
    };

    case SDLK_F1:
        return F1;
    case SDLK_F2:
        return F2;
    case SDLK_F3:
        return F3;
    case SDLK_F4:
        return F4;
    case SDLK_F5:
        return F5;
    case SDLK_F6:
        return F6;
    case SDLK_F7:
        return F7;
    case SDLK_F8:
        return F8;
    case SDLK_F9:
        return F9;
    case SDLK_F10:
        return F10;
    case SDLK_F11:
        return F11;
    case SDLK_F12:
        return F12;
    case SDLK_F13:
        return F13;
    case SDLK_F14:
        return F14;
    case SDLK_F15:
        return F15;