char is signed on some platforms. ensure that isupper() & isdigit() are called with positive ints.
char is signed on some platforms. ensure that isupper() & isdigit() are
called with positive ints.

each/bind9-collab,each/bind9-collab,each/bind9-collab,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,each/bind9-collab,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,pecharmin/bind9,each/bind9-collab