char *ds_put_uninit(struct ds *, size_t n);
void ds_put_char(struct ds *, char);
void ds_put_char_multiple(struct ds *, char, size_t n);
+void ds_put_buffer(struct ds *, const char *, size_t n);
void ds_put_cstr(struct ds *, const char *);
void ds_put_format(struct ds *, const char *, ...) PRINTF_FORMAT(2, 3);
void ds_put_format_valist(struct ds *, const char *, va_list)