On Wed, 17 Nov 2004, Rafael Martinez Torres wrote:
>
> I have no problems to interface such a function in C with the next
> prototype:
>
> int foo(int a, int b);
>
> Problemas arise when dealing with variable-arguments prototypes like :
>
> int foo( int a, ...);
>
> How to solve it ?
>
This what I have found : it may be usefull for ffi readers:
This is not very precise, but usually you may find sligth variations on a
variadic function such as:
int foo(int a, char b,int count,...);
int fooA(int a, char b, (void *) args);
int fooV(int a, char b, va_list args);
Each one implements an specific calling convention we should follow.
For Haskell wrappers, should not be difficult tryin to wrap the second:
foo :: CInt -> CChar -> [Arg] -> IO(CInt)
foo i c args = do
ptr <- allocArgs args -- Following the particular calling convention
b <- fooA i c ptr --Note the fooA
return b
fooA :: CInt -> CChar -> Ptr a -> IO(CInt)
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