There is no need to change the the_author() function itself. A simple conditional tag will do the trick. Example:
<?php
/*** on your functions.php file ***/
function ifRegistered() {
if(is_user_logged_in()) {
the_author();
} else {
echo get_the_post_meta($post->ID, 'your_post_meta_key', true);
// or anything else, of course
}
}
/*** on the template you want to use the function **/
// your HTML markup ...
ifRegistered();
// more possible HTML ...
?>
Hope that helps!
EDIT: Updated the function.
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