void ds_put_format(struct ds *, const char *, ...) PRINTF_FORMAT(2, 3);
void ds_put_format_valist(struct ds *, const char *, va_list)
PRINTF_FORMAT(2, 0);
+void ds_put_printable(struct ds *, const char *, size_t);
void ds_put_hex_dump(struct ds *ds, const void *buf_, size_t size,
uintptr_t ofs, bool ascii);
char *ds_cstr(struct ds *);