-WRBUF wrbuf_alloc(void);
-void wrbuf_free(WRBUF b, int free_buf);
-void wrbuf_rewind(WRBUF b);
-int wrbuf_grow(WRBUF b, int minsize);
-int wrbuf_write(WRBUF b, char *buf, int size);
+YAZ_EXPORT WRBUF wrbuf_alloc(void);
+YAZ_EXPORT void wrbuf_free(WRBUF b, int free_buf);
+YAZ_EXPORT void wrbuf_rewind(WRBUF b);
+YAZ_EXPORT int wrbuf_grow(WRBUF b, int minsize);
+YAZ_EXPORT int wrbuf_write(WRBUF b, char *buf, int size);
+
+#define wrbuf_len(b) ((b)->pos)
+#define wrbuf_buf(b) ((b)->buf)