(question) File import/export for Gnumeric -- where to look?

[William Park <opengeometry yahoo ca>]

Hi,

I would like to add a file import/export to Gnumeric code, and see how
it goes.  The file format is sort of 3-column CSV.  I've finally managed
to compile Gnumeric-1.11.6 on Slackware-14 (had to upgrade goffice and
libgsf).

So, can someone point me directory/file to look at?  According to grep
and comments,
    src/stf*
may be relevant.  Is that true?
-- 
William