screen_set_cursor_style
screen_set_cursor_style(n, &s->cstyle, &s->mode);
screen_set_cursor_style(c, &s->default_cstyle, &s->default_mode);
screen_set_cursor_style(n, &sl->active->default_cstyle,
void screen_set_cursor_style(u_int, enum screen_cursor_style *, int *);