[plt-scheme] two tricky types

Hello,
I am writting some FFIs on PTL Scheme 299.400 and I encountered two tricky 
types on MySQL:

One is:
	typedef char my_bool;
which is similar to foreing's bool, but it uses char instead of bool (it seems 
the mysql guys want to save memory), so, I implemented it this way:
  (define _my_bool (make-ctype _byte
                              (lambda (x)
                                (if x 1 0))
                              (lambda (x)
                                (if (= x 0) #f #t))))
Is it all-rigth?

And the other one is a bit more tricky:

#if defined(NO_CLIENT_LONG_LONG)
typedef unsigned long my_ulonglong;
#elif defined (__WIN__)
typedef unsigned __int64 my_ulonglong;
#else
typedef unsigned long long my_ulonglong;
#endif

I do not care about Windows but I am not sure where NO_CLIENT_LONG_LONG comes 
from, so I did:
(define _my_ulongulong (make-ctype _ulong #f #f))
any ideas if that is ok ?
Thank you.
-- 
Pupeno <pupeno at pupeno.com> (http://pupeno.com)
Vendo: Gabinete tower: http://pupeno.com/spa/vendo/#Gabinete
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