C-FFI, results, conditions

Hello all (and especially housel),

When wrapping an API with C-FFI (either directly or via melange generating
C-FFI), I often run into a situation where I have a function that returns 0
or an error code.

I'd like to be able to have the C-FFI know how to pass the result to a
mapping function which would check for non-zero and then signal a condition
as appropriate.  This function would probably be inline-only in many cases,
but that's probably immaterial.

The alternative is that I effectively do:

    define c-function %bar
      ...
      c-name: "bar";
    end;

    define inline-only function bar (...)
      libfoo-raise-or-return(%bar(...))
    end;

And that's pretty verbose and annoying, when I could instead do something
like:

    define c-function bar
      result-handler: libfoo-raise-or-return;
    end;

I'm not sure how to actually implement this entirely yet
in sources/dfmc/c-ffi/c-function-macro.dylan ...

Looking at C-FFI and UFFI for Common Lisp as well as SWIG, none of them
appear to support this.

Thoughts? Worthwhile or not?

 - Bruce

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