How to convert char from Emacs-20 internal to UTF-8?

[Adrian Robert]

Hi all,

I apologize for the "retro" question, but I was wondering if there was 
an easy way to convert a character in the Emacs-20 internal 19-bit 
encoding (from FAST_GLYPH_CHAR(glyph)) to UTF-8 (preferable) or 
straight Unicode.  I'd like to do it fully within C if possible, and it 
needs to be efficient.  I've looked into CCL a little bit and also 
found http://tclab.kaist.ac.kr/~otfried/Mule/ , but it's a bit tough 
getting started with this stuff and since I just want a single special 
case I was wondering if anyone knew a handy invocation, or an 
alternative to CCL.

thanks,
Adrian