This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
Fixed the gets() changes. The buffer contents is indeterminate when
fgets() returns NULL... Now when you type EOT at one of the prompts,
the program usually spins reading the sticky EOF instead of dumping
core. Even GUIs could do better.
Added $Id$.
Obtained from: partly from 4.4BSD-Lite2
