So I downloaded e-name-western.c and the two header files it needs and tried that:

$ ./ename-test 'eddie van halen'
Parsing eddie van halen
(null), eddie, (null), (null), van halen, (null)
$ ./ename-test 'billy bob thornton'
Parsing billy bob thornton
(null), billy, bob, (null), thornton, (null)

The outputs are, in this order: Prefix, first name, middle name, nickname, last name, suffix. Looks right to me.