ANSI C, X/Open C, and Sun C

[Alan Steiner x45347]

Three questions:

1) Does the X/Open standard for C endorse ANSI C fully, or does
   X/Open's standard differ?

2) Does Sun C vers. 4.1 comply with the X/Open standard?

3) Does Sun C vers. 4.1 comply with ANSI C?  (It doesn't support
   function protyping, or the new style of function defintion, which
   I thought were part of ANSI C.)

Thanks very much...

Alan
alan at cave.arc.nasa.gov