gptokeyb with kill mode

kill_mode.cpp

    bool kill_mode = // ...
    bool back_pressed = false;
    bool start_pressed = false;

    SDL_Event event;
    bool running = true;
    while (running) {
        if (!SDL_WaitEvent(&event)) {
            printf("SDL_WaitEvent() failed: %s\n", SDL_GetError());
            return -1;
        }

        switch (event.type) {
            case SDL_CONTROLLERBUTTONDOWN:
            case SDL_CONTROLLERBUTTONUP:
                {
                    const bool is_pressed =
                        event.type == SDL_CONTROLLERBUTTONDOWN;

                    if (kill_mode) {
                        switch (event.cbutton.button) {
                            case SDL_CONTROLLER_BUTTON_BACK: // aka select
                                back_pressed = is_pressed;
                                break;

                            case SDL_CONTROLLER_BUTTON_START:
                                start_pressed = is_pressed;
                                break;
                        }

                        if (start_pressed && back_pressed) {
                            printf("Killing: %s\n", AppToKill);
                            system( (" killall  '"+std::string(AppToKill)+"' ").c_str() );
                            exit(0);
                        }
                    } else {
                        switch (event.cbutton.button) {
                            case SDL_CONTROLLER_BUTTON_DPAD_LEFT:
                                emitKey(KEY_LEFT, is_pressed);
                                break;

                            case SDL_CONTROLLER_BUTTON_DPAD_UP:
                                emitKey(KEY_UP, is_pressed);
                                break;

                            case SDL_CONTROLLER_BUTTON_DPAD_RIGHT:
                                emitKey(KEY_RIGHT, is_pressed);
                                break;

                            case SDL_CONTROLLER_BUTTON_DPAD_DOWN:
                                emitKey(KEY_DOWN, is_pressed);
                                break;

                            case SDL_CONTROLLER_BUTTON_A:
                                emitKey(KEY_ENTER, is_pressed);
                                break;

                            case SDL_CONTROLLER_BUTTON_B:
                                emitKey(KEY_ESC, is_pressed);
                                break;

                            case SDL_CONTROLLER_BUTTON_BACK: // aka select
                                emitKey(KEY_PLAYPAUSE, is_pressed);
                                break;

                            case SDL_CONTROLLER_BUTTON_START:
                                emitKey(KEY_ENTER, is_pressed);
                                break;
                        }
                    }
                }
                break;

            case SDL_CONTROLLERDEVICEADDED:
                SDL_GameControllerOpen(event.cdevice.which);
                break;

            case SDL_CONTROLLERDEVICEREMOVED:
                if (SDL_GameController* controller = SDL_GameControllerFromInstanceID(event.cdevice.which))
                {
                    SDL_GameControllerClose(controller);
                }
                break;

            case SDL_QUIT:
                running = false;
                break;
        }
    }