FFI: 'C structure' assignment/copying

Is there a 'preferred' idiom for assigning (copying) instances of a C 
structure defined with DEFCSTRUCT and allocated on the foreign heap?

That is, if I have e.g. a 4x4 matrix structure:

(ct:defcstruct matrix ((mat ((:single-float 4) 4))))

I can't say:

(defmacro deref-cpointer (ptr &optional (type '(:void *)))
   `(ct:cref (,type *) ,ptr 0))

(let ((m1 (ct:malloc (ct:sizeof 'matrix)))
       (m2 (ct:malloc (ct:sizeof 'matrix))))
   (setf (deref-cpointer m1 matrix) (deref-cpointer m2 matrix)))

to be the equivalent of:

struct matrix { float mat[4][4]; } m1, m2; m1=m2;

I don't need member-wise assignment, just a straight memcpy. ;) So if 
there's some nice little embedded assembler function somewhere in 
sys/*.lisp that I could use, that would be great.

Cheers,

John :^P

--
John Pallister
[email protected] 


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