[Cocci] Help with SMPL

[lars@metafoo.de (Lars-Peter Clausen)]

On 09/26/2012 04:36 PM, Peter Senna Tschudin wrote:
> Dear List,
> 
> I'm trying to make a semantic patch for the case described on the patch:
> http://www.mail-archive.com/linux-media at vger.kernel.org/msg52660.html
> 
> Some relevant code snippets:
> 
> http://lxr.free-electrons.com/source/drivers/media/video/em28xx/em28xx.h#L482
> -- // --
> struct em28xx {
> ...
> int model;              /* index in the device_data struct */
> ...
> struct em28xx_board board;
> ...
> }
> -- // --
> 
> http://lxr.free-electrons.com/source/drivers/media/video/em28xx/em28xx.h#L690
> -- // --
> ...
> extern struct em28xx_board em28xx_boards[];
> ...
> -- // --
> 
> I'm trying the semantic patch:
> @@
> type T;
> expression to,from,flag;
> @@
> - memcpy((T)&to,(T)&from,flag);
> + to = from;
> 
> But it is not working. How can I specify "to" and "from" for match
> cases like this?

Do you want the types of "to" and "from" to match? Then you could do
something like:

@@
type T;
T to;
T from;
expression size;
@@
-memcpy(&to, &from, size);
+to = from;

- Lars