g.filename

[Xin Zhuang]

g.manual says it prints a GRASS database file name.
This is the syntax:

	g.filename element=dig_map mapsep=/usr/grass/data/spearfish/workspace \
				file=roads

Everyone knows that dig_map doesn't exits. But g.filename generated
dig_map under workspace.
^^^^^^^

BY checking the src, this is what I found:

	G__make_mapset_element(element);
	G__file_name(path, element, name, mapset);

I don't have any document showing the usage of
these "G__" functions. But I think the 1st one
is to create instead of to check.


BTW, I would appreciate anyone can tell me
where I can find documentation about
functions like these G__.


--Xin
zhuang at access.digex.com