[Cocci] struct replacement

[Max <msuraev@sysmocom.de>]

Hi.

I have been trying to use spatch to update c struct but haven't found a 
way to do so yet.

For example, we have

struct old_thing {

uint8_t a;

uint16_t b[5];

};

which I'd like to replace with

struct new_thing {

uint8_t x1;

uint32_t x2;

uint8_t x3[11];

};

So pretty much replace every function parameter:

f1(... struct old_thing *t...) => f1(... struct new_thing *t...)

Replace the field access and variable definitions:

...

struct old_thing t1; => struct new_thing t1;

struct old_thing *t2; => struct new_thing *t2;

...

t1.a => t1.x1

t2->b => t2->x3

...

The thing which escapes me is how to make coccinelle treat it like a type?

Do I need to use @@typedef struct old_thing@@? Do I use it as 
@@identifier old_stuff@@ or @@identifier struct old_stuff@@?

Doesn't seem to work for me.

Any links to .spatch examples playing around with structs would be 
greatly appreciated.

-- 
- Max Suraev <msuraev@sysmocom.de>       http://www.sysmocom.de/
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