X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/clg/blobdiff_plain/688630ccd8a9218592995112f29311a4c62d63e2..7af3f90b04993dbb4bf7c28ecbf3777d9d09b55e:/glib/glib.lisp

diff --git a/glib/glib.lisp b/glib/glib.lisp
index 01bd66f..8bbda64 100644
--- 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 1.31 2005/04/24 13:27:20 espen Exp $
+;; $Id: glib.lisp,v 1.35 2006/02/19 22:34:28 espen Exp $
 
 
 (in-package "GLIB")
@@ -47,6 +47,23 @@ (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"))
+	    (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
+	   (progn ,@body)
+	 (deallocate-memory ,var)))))
+
 
 ;;;; User data mechanism
 
@@ -230,7 +247,8 @@ (defmethod writer-function ((type (eql 'glist)) &rest args)
 (defmethod reader-function ((type (eql 'glist)) &rest args)
   (declare (ignore type))
   (destructuring-bind (element-type) args
-    #'(lambda (location &optional (offset 0))
+    #'(lambda (location &optional (offset 0) weak-p)
+	(declare (ignore weak-p))
 	(unless (null-pointer-p (sap-ref-sap location offset))
 	  (map-glist 'list #'identity (sap-ref-sap location offset) element-type)))))
 
@@ -339,7 +357,8 @@ (defmethod writer-function ((type (eql 'gslist)) &rest args)
 (defmethod reader-function ((type (eql 'gslist)) &rest args)
   (declare (ignore type))
   (destructuring-bind (element-type) args
-    #'(lambda (location &optional (offset 0))
+    #'(lambda (location &optional (offset 0) weak-p)
+	(declare (ignore weak-p))
 	(unless (null-pointer-p (sap-ref-sap location offset))
 	  (map-glist 'list #'identity (sap-ref-sap location offset) element-type)))))
 
@@ -486,7 +505,8 @@ (defmethod reader-function ((type (eql 'vector)) &rest args)
   (destructuring-bind (element-type &optional (length '*)) args
     (if (eq length '*)
 	(error "Can't create reader function for vector of variable size")
-      #'(lambda (location &optional (offset 0))
+      #'(lambda (location &optional (offset 0) weak-p)
+	  (declare (ignore weak-p))
 	  (unless (null-pointer-p (sap-ref-sap location offset))
 	    (map-c-vector 'vector #'identity (sap-ref-sap location offset) 
 	     element-type length))))))
@@ -607,7 +627,8 @@ (defmethod reader-function ((type (eql 'null-terminated-vector)) &rest args)
   (destructuring-bind (element-type) args
     (unless (eq (alien-type element-type) (alien-type 'pointer))
       (error "Elements in null-terminated vectors need to be of pointer types"))
-    #'(lambda (location &optional (offset 0))
+    #'(lambda (location &optional (offset 0) weak-p)
+	(declare (ignore weak-p))
 	(unless (null-pointer-p (sap-ref-sap location offset))
 	  (map-0-vector 'vector #'identity (sap-ref-sap location offset) 
 	   element-type)))))
@@ -704,7 +725,8 @@ (defmethod writer-function ((type (eql 'counted-vector)) &rest args)
 (defmethod reader-function ((type (eql 'counted-vector)) &rest args)
   (declare (ignore type))
   (destructuring-bind (element-type) args
-    #'(lambda (location &optional (offset 0))
+    #'(lambda (location &optional (offset 0) weak-p)
+	(declare (ignore weak-p))
 	(unless (null-pointer-p (sap-ref-sap location offset))
 	  (map-counted-vector 'vector #'identity 
 	   (sap-ref-sap location offset) element-type)))))