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From: guy@auspex.UUCP (Guy Harris)
Newsgroups: comp.lang.c
Subject: Re: getch() and getche() in MSC 4.0
Keywords: *##%@^!&ing functions!
Message-ID: <315@auspex.UUCP>
Date: 27 Oct 88 17:13:52 GMT
References: <10508@dartvax.Dartmouth.EDU> <10523@dartvax.Dartmouth.EDU> <236@shockeye.UUCP>
Reply-To: guy@auspex.UUCP (Guy Harris)
Organization: Auspex Systems, Santa Clara
Lines: 31

>Okay, I'm confused. We've got a System V Release 1<n<2 system here, and
>conv(3c) says that toupper is a function and _toupper is the macro.
>We've got a Genix (4.1BSD) system that says toupper is a macro (and notes
>that it is the same as SysV _toupper.) Turbo C agrees with SysV.
>
>How many systems have it which way? (I know. It is unwise to depend on
>"toupper" in portable programs...)

UNIX V7 had "toupper" a macro, with no "_toupper".  I think they renamed
that macro "_toupper" and added the function "toupper" - which, unlike
the macro, is supposed to leave characters that aren't lower-case
letters alone, rather than performing unnatural acts on them - in S5 (it
may have been S3).

4.xBSD didn't pick up the S5 stuff; it stuck with the V7 version. 
Systems based on V7 or 4.xBSD (and maybe S3) that haven't made
themselves S5-compatible will probably have "toupper" as a macro;
systems that have made themselves S5-compatible will have it as a
function, at least in their S5-compatbile environment - if they also
offer a BSD-compatible environment, it will probably be a macro in that
environment.

I suspect most of the microcomputer systems will work in S5 fashion. 
VAX C probably does it in BSD fashion.

K&R Second Edition, based on some ANSI C draft, specifies that "toupper"
must work in the S5 fashion (leaving characters that aren't lower-case
letters alone), although (not having a draft handy) I don't know whether
ANSI C allows this to be done with a macro or not.   It doesn't say
anything about "_toupper", so I assume it's not guaranteed to exist in
an ANSI C implementation.