[DDRAW] DD_STRUCT_COPY_BYSIZE: Do not clear more that struct size

[Christian Costa]

Hi,

Apps should initialize correctly the dwSize member of ddraw structures.
However some of them do not do this and Windows seems to handle that 
case without crashing.
Here is a patch that prevents clearing more that the struct size.
This fixes the bug 2070.

Bye.

Changelog :
DD_STRUCT_COPY_BYSIZE: Do not clear more that struct size

Christian Costa   titan.costa at wanadoo.fr
-------------- next part --------------
Index: ddraw_private.h
===================================================================
RCS file: /home/wine/wine/dlls/ddraw/ddraw_private.h,v
retrieving revision 1.40
diff -u -r1.40 ddraw_private.h
--- ddraw_private.h	15 Sep 2003 20:00:03 -0000	1.40
+++ ddraw_private.h	15 Mar 2004 17:49:02 -0000
@@ -45,7 +45,10 @@
 	do {						\
 	    	DWORD __size = (to)->dwSize;		\
 	    	DWORD __copysize = __size;		\
-                memset(to,0,__size);                    \
+	    	DWORD __resetsize = __size;		\
+	        if (__resetsize > sizeof(*to))		\
+		    __resetsize = sizeof(*to);		\
+	    	memset(to,0,__resetsize);               \
 	        if ((from)->dwSize < __size) 		\
 		    __copysize = (from)->dwSize;	\
 		memcpy(to,from,__copysize);		\