Sorry to ask this here, though I'm sure you'll point me to the information.

Is there some definitive reference on UDF functions somewhere ?
I mean something _complete_ that documents it.

Kind of information I would like to double-check :
a) kind of parameter passing method : cdecl, stdcall, what else ?
b) table of type mappings : wanting to write a UDF supposed to take one
dialect 3 DATE argument, what type is the C function supposed to receive ?
An ISC_DATE* ? something else ?

The documentation seems extremely sparse about UDFs.
But a lot of people have, of course, successfully built UDF libraries.
(I am not saying I've got problems. Not tried. I just want to read the
specification before even trying.)

I surely have missed one piece of documentation. But which one ?

Thanks for pointers,

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