Converting a function in C

Hi

Can any one please help me write the following triger
in C, your help would be much appreciated

/* Archive function */
DROP FUNCTION fn_archive();
CREATE FUNCTION fn_archive() RETURNS OPAQUE AS '
BEGIN
/* TG_OP is the function (UPDATE, DELETE,
SELECT) */
INSERT INTO adres_archive
VALUES
(OLD.name,OLD.adres,OLD.tel,current_user,now(),TG_OP);

IF TG_OP = ''UPDATE''
THEN
NEW.modtime := ''now'';
RETURN NEW;
END IF;

RETURN OLD;
END;
' LANGUAGE 'plpgsql';

Tks
Mike

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