[Cocci] How can i rename a specific structure field?

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

On 10/02/2014 10:12 PM, jmiguel hernandez wrote:
> if i have this
>
> typedef struct type1 {
>    char8 a;
>    char8 b;
>    char8 c;
> }
>
> typedef struct _interface {
>    type1 field1;
> }interface;
>
> and want to change to
>
> typedef struct type1 {
>    char8 d;
>    char8 b;
>    char8 c;
> }
>
> typedef struct _protocol {
>    type1 *field1;
> }interface;
>
> interface *p
>
> -p->field->a
> +p->field->d
>
> I have tried just changing field1 to field2. This gives parsing errors.
>
> @@
> typedef interface;
> interface *p;
> typedef type1;
> type1 field1;
> @@
> <...
> -p->field1
> +p->fieldnew
> ...>

If you want to change the field from being embedded in the parent struct to 
a pointer and rename the field at the same time the way to go is

@@
typedef interface;
interface *p;
@@
p->field1
-.a
+->b

That replaces the ".a" with a "->b"

- Lars