void text_screen_clear(struct text_screen *screen);
void text_screen_append_line(struct text_screen *screen,
const char *fmt, ...) __attribute__((format(printf, 2, 3)));
void text_screen_clear(struct text_screen *screen);
void text_screen_append_line(struct text_screen *screen,
const char *fmt, ...) __attribute__((format(printf, 2, 3)));