From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=0.2 required=5.0 tests=BAYES_00,INVALID_MSGID,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,6bf9d4ba0cfd8cb6
X-Google-Attributes: gid103376,public
From: Florian Weimer <fw@deneb.cygnus.argh.org>
Subject: [OT] C and in-band signalling (was: Re: Announce: OpenToken 2.0
 released)
Date: 2000/03/05
Message-ID: <873dq5ntj5.fsf_-_@deneb.cygnus.argh.org>#1/1
X-Deja-AN: 593506552
References: <3890C62B.18309585@telepath.com>
 <t7n1plq56s.fsf@calumny.jyacc.com> <876unj$jcs$1@nnrp1.deja.com>
 <t790146b69.fsf@calumny.jyacc.com> <87d7qck6pm.fsf@deneb.cygnus.argh.org>
 <t71z6pf46c.fsf@calumny.jyacc.com> <wcc4sbimred.fsf@world.std.com>
 <t7bt5qrsgj.fsf@calumny.jyacc.com> <wccg0urgayx.fsf@world.std.com>
 <t7wvo3bu2h.fsf@calumny.jyacc.com> <88iuk2$s6d3@ftp.kvaerner.com>
Mail-Copies-To: never
Supersedes: <877lfhntn1.fsf_-_@deneb.cygnus.argh.org>
Content-Type: text/plain; charset=us-ascii
X-Complaints-To: abuse@cygnus.argh.org
X-Trace: deneb.cygnus.argh.org 952282046 21167 192.168.1.2 (5 Mar 2000
 18:47:26 GMT)
Organization: Penguin on board
Mime-Version: 1.0
User-Agent: Gnus/5.0804 (Gnus v5.8.4) Emacs/20.4
Reply-To: Florian Weimer <fw-usenet@deneb.cygnus.argh.org>
NNTP-Posting-Date: 5 Mar 2000 18:47:26 GMT
Newsgroups: comp.lang.ada
Date: 2000-03-05T18:47:26+00:00
List-Id: <comp.lang.ada>

"Tarjei T. Jensen" <tarjei.jensen@kvaerner.com> writes:

> Hyman Rosen wrote
> >(I know that
> >the number of platforms where sizeof(int) == sizeof(char) is non-zero,
> >but do those platforms have 32-bit input from external sources?)
> 
> Is that a problem on any plattform? EOF is not a fixed value. 

Yes, it is a preprocessor macro "which expands to an integer constant
expression, with type int and a negative value".

> It is traditionally -1. If, on a platform where sizeof(int) ==
> sizeof(char) there is a convention that characters are positive
> (assuming the sizeof(int) > 8) then a convention which use negative
> numbers for signalling would still work.

No, for binary files, a conforming implementation has to be able to store
and retrieve all possible char type values, including the negative ones.