Marshalling Haskell String <-> UTF-8

[Bayley, Alistair]

I want to call a foreign C function that takes a UTF-8 encoded string as one
of its arguments (and there's also a version of the function that receives
UTF-16). Can someone point me to documentation or examples of how this would
be done? AFAICT (reading the FFI spec) marshalling a String to a CString is
locale-dependent, whereas I know that I want UTF-8/16.

Also, if a C function returns a UTF-8 (or UTF-16) encoded string, how do I
marshall this reliably into a Haskell String?

Can I use the UTF-16 functions directly with CWStrings? (I'm not sure
exactly what wchar_t is, as it's apparently dependent on the locale at
compile-time, and could be 8, 16, or 32 bits).

Thanks,
Alistair.

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