Clearing stack allocated memory

diff --git a/glib/glib.lisp b/glib/glib.lisp
index be287eb24f4062d412b9413d8e0aaa0a5e484258..8bbda64bf2090c7703f0bd8077813b42c6623203 100644 (file)
--- a/glib/glib.lisp
+++ b/glib/glib.lisp
@@ -20,7 +20,7 @@
 ;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 ;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-;; $Id: glib.lisp,v 1.34 2006/02/15 09:53:42 espen Exp $
+;; $Id: glib.lisp,v 1.35 2006/02/19 22:34:28 espen Exp $
 
 
 (in-package "GLIB")
@@ -47,11 +47,17 @@ (defun copy-memory (from length &optional (to (allocate-memory length)))
   #+sbcl(system-area-ub8-copy from 0 to 0 length)
   to)
 
+(defun clear-memory (from length)
+  #+cmu(system-area-fill 0 0 from 0 (* 8 length))
+  #+sbcl(system-area-ub8-fill 0 from 0 length))
+
 (defmacro with-allocated-memory ((var size) &body body)
   (if (constantp size)
-      (let ((alien (make-symbol "ALIEN")))
-       `(with-alien ((,alien (array #+sbcl(sb-alien:unsigned 8) #+cmu(alien:unsigned 8) ,(eval size))))
+      (let ((alien (make-symbol "ALIEN"))
+           (size (eval size)))
+       `(with-alien ((,alien (array #+sbcl(sb-alien:unsigned 8) #+cmu(alien:unsigned 8) ,size)))
           (let ((,var (alien-sap ,alien)))
+            (clear-memory ,var ,size)
             ,@body)))
     `(let ((,var (allocate-memory ,size)))
        (unwind-protect