Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!eecae!tank!mimsy!chris
From: chris@mimsy.UUCP (Chris Torek)
Newsgroups: comp.lang.c
Subject: Re: WANTED: do while no key pressed (in portable code)
Message-ID: <16535@mimsy.UUCP>
Date: 26 Mar 89 04:47:49 GMT
References: <22064@agate.BERKELEY.EDU>
Distribution: usa
Organization: U of Maryland, Dept. of Computer Science, Coll. Pk., MD 20742
Lines: 23

In article <22064@agate.BERKELEY.EDU> air@anableps.berkeley.edu writes:
>title says it all.

Titles get truncated, so here it is again:

>WANTED: do while no key pressed (in portable code)

Step 1: define, portably, `key pressed'.

I can think of a number of different definitions:

	- there is input available (has nothing to do with `keys' pe se)
	- terminal input is available, character-at-a-time
	- a non-modifier (not SHIFT, etc.) key on a computer keyboard
	  is in the `down' position
	- any key (including SHIFT) is in the down position

The only one that can even make a pretense at portability is the
first, and on a closer look, one discovers that there is no portable
way to do that either.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris@mimsy.umd.edu	Path:	uunet!mimsy!chris