Quick Newbie Question About Conformance Tests

[RedAces]

I'm interested in helping Wine write some conformance tests. The problem is I don't understand any of the code such as:

trace("testing GlobalAddAtomA\n");
trace("foo=%d\n",foo);

ATOM atom = GlobalAddAtomA( "foobar" );
ok( GlobalFindAtomA( "foobar" ) == atom, "could not find atom foobar\n" );
ok( GlobalFindAtomA( "FOOBAR" ) == atom, "could not find atom FOOBAR\n" );

I have no idea which language this is.
I'm not expecting this to be easy. What are some prerequisites that I have to learn before I start?

P.S. I have previous experience in Java, Scheme and C#