Idea found on the Circle Mailing List.
Callback functions - Parsing Single Line/Menu Input through STATE()'s
Callback v.1.0 -- 6/10/01

Idea by Jim Persson (jim@LINUX.NU) - he's a sort of newbie :-)
Mailer code by Mike Breuer (mbreuer@new.rr.com)
Adjustments and modifications by Akuma -- me (doomer18@hotmail.com)

Well, after hearing a little bit about this on the mailing list,
I decided to implement the mailer code provided by Mike Breuer.
Needless to say, it did require a little bit of fiddling to get 
it to work, but I did make it happen.

Ok, here's the scoop on this setup.  Have you ever wanted to ask
a person a question, or two, and keep their input for refernce
to other functions?  Like having a guildmaster ask someone if they
REALLY want to use those extra practice points for a good skill?
Or maybe just ask them a simple yes or no question?  Well, if you
ever did that before, you know how much of a pain in the but it
was to add an extra CON state for every single question you wanted
to ask.  Now, you only need one! :-)

To ask the question you simply want to call the function like so:
line_input(ch->desc, "Here's a question (A, B, C) : ", parse_callback, NULL);
parse_callback is a function that parses the choices.  You can even have
complete menus if you want (just like Oasis OLC :-).  The NULL at the end
is used in case you want to chain multiple questions within each other.
That requires a bit more understanding of how it's done, though.

Well, all that's needed is modifications to a few files.  See 'callback.txt'
for full details.

Akuma the Raging Coder