[plt-scheme] Make uninitialized cstruct

On Jun 17, Chihiro Kuraya wrote:
> I want to make large cstruct by not initializing its fields.
> define-cstruct syntax provides make-TYPE function, but it is always
> required to specify initial values of all fields.
> 
> This is very cumbersome in the case structure is used only for
> retrieving information by forign function (for eaxample,
> GetStartupInfo Windows API).
> 
> Are there any way to make uninitialized cstruct or
> zero-initialized cstruct ?

Yes, but you'll need to work a bit under the struct hood.  You can use
(malloc _your-struct) and then use set-cpointer-tag! and
your-struct-tag with the result.

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