Reading a keystroke w/o echo

[Randy Azarian]

I am trying to write some C code that will be able to be portable to a number
of platforms (Unix, MVS, DOS, MPE) without modification of any kind.  I/O will
be nothing fancy, using printf's and the like.  

I need to accept a user password (that won't echo to the screen).  So what I 
am looking for is an ANSI-C routine that will accept a keystroke without 
echoing it to the screen.

Does anyone know of such a function or a way to fool stdin/stdout to 
accomplish the same thing?