On Tue, 12 Oct 2010, Aaen, Andreas.Bach wrote:
> I have a number of old C programs which store binary data based on a struct.
> Newer versions of the same program uses an updated struct.
> Now I need to create a tool to update stored binary data to the new format.
>
> So if you have a struct
>
> typdef struct custom {
> int a;
> dword b;
> byte c;
> }
>
> Then it would be nice if you could create a Cocinelle expression that parses
> this struct and prints out "a b c".
> This could then easily be changed to offsetof(custom,a); offsetof(custom,b);
> offsetoff(custom,c); and finally create a new C-program that provide you with
> all the offsets of the structured data as defined by the pragma settings and
> the compiler.
>
> if you look at the metadecl possibilities that Coccinelle support, then how
> does it parse a struct?
>
> a Coccinelle spatch like this:
> ---------------------
> @r@
> identifier v;
> type t;
> @@
> typedef struct custom {
> ...
> t v;
> ...
> }
Typedef needs a name and a ; after it (typedef struct x { ... } y;)
But maybe you don't need the typedef? The following parses as well:
@r@
identifier v;
type t;
@@
struct custom {
...
t v;
...
}
@ script:python @
t << r.t;
v << r.v;
@@
print "type" . t . "name" . v;
julia
> @ script:python @
> t << r.t;
> v << r.v;
> @@
> print "type" . t . "name" . v;
> ---------------------
>
> obviously doesn't work, as it can't parse, but it should give an idea about
> what I am trying to obtain.
>
> Regards
> Andreas Bach Aaen
>
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