int read_one_char(FILE *f, char *ret, usec_t timeout, bool *need_nl);
int ask_char(char *ret, const char *replies, const char *text, ...) _printf_(3, 4);
-int ask_string(char **ret, const char *text, ...) _printf_(2, 3);
+// UNNEEDED int ask_string(char **ret, const char *text, ...) _printf_(2, 3);
int vt_disallocate(const char *name);
unsigned columns(void);
int fd_lines(int fd);
unsigned lines(void);
-void columns_lines_cache_reset(int _unused_ signum);
+// UNNEEDED void columns_lines_cache_reset(int _unused_ signum);
bool on_tty(void);