does cvs use iso 8859 or unicode?

[Ronald Petty]

I am working on a parser for cvs files like somefile,v.  However I read
the man page for rcs file "man rcsfile" and it says they mainly use iso
8859/1 for what they consider visible characters and whitespace.  I was
wondering if this is true or not.

Basically when I write this parser, in order to 

       sym       ::=  {digit}* idchar {idchar | digit}*

       idchar    ::=  any visible graphic character except special

       special   ::=  $ | , | . | : | ; | @

I need to be sure what "any visible graphic character" is.  If cvs only
uses ascii this would be easy, but I doubt that is the case.

Thanks again.
Ron