Someone

enum {
    ACTION_UNUSED = -1,
    ACTION_NONE = 0,
    /* directions */
    ACTION_UP,
    ACTION_DOWN,
    ACTION_LEFT,
    ACTION_RIGHT,
    ACTION_PGUP,
    ACTION_PGDOWN,
    ACTION_PGLEFT,
    ACTION_PGRIGHT,
    /* actions */
    ACTION_SELECT,
    ACTION_MENU,
    ACTION_BACK,
    ACTION_CONTEXT,
    ACTION_EXIT,
    /* special stuff */
    ACTION_HOLDTOGGLE,
    ACTION_HOLD,
    ACTION_SPECIAL1,
    ACTION_SPECIAL2,
    ACTION_SPECIAL3,
    
};