+char *mp_strjoin(struct mempool *p, char **a, uns n, uns sep) LIKE_MALLOC;
+
+/* mempool-fmt.c */
+
+char *mp_printf(struct mempool *p, char *fmt, ...) FORMAT_CHECK(printf,2,3) LIKE_MALLOC;
+char *mp_vprintf(struct mempool *p, char *fmt, va_list args) LIKE_MALLOC;