use of _s[io]buf in stdio library

[Henry Spencer]

> I have thought about using them in my own programs, maybe that's
> even what they are for!?

Don't!!  They are a detail of the implementation of stdio, and are *not*
guaranteed to be present in all implementations.  The intent was to make
sure that buffers for stdin and stdout were always available if they were
needed, whence the names.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry