Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!haven!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: Atomic #defines (was Re: Password checking program)
Message-ID: <10783@smoke.BRL.MIL>
Date: 19 Aug 89 05:22:45 GMT
References: <15257@duke.cs.duke.edu> <652@lakart.UUCP> <13569@bloom-beacon.MIT.EDU> <10765@smoke.BRL.MIL> <3019@solo1.cs.vu.nl>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 13

In article <3019@solo1.cs.vu.nl> maart@cs.vu.nl (Maarten Litmaath) writes:
>What should he use instead?
>	#define	ERROR	(-2)
>... might not work either!

I already answered that:  He should not attempt to add his own extensions
onto the getc() extended range (characters + EOF), but should define his
own special values.  For example:
	int my_getch() {
		int	c = getchar();
		return c != EOF ? c : ferror(stdin) ? MY_ERR : MY_EOF;
	}
where MY_ERR and MY_EOF are any two distinct negative ints.