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Groups > comp.lang.c > #3348

Re: Return value for error

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On Thu, 05 May 2011 15:13:14 +0100, Ben Bacarisse wrote:

>>>   (7.26.2 reserves "macros that begin with E and a digit or E and an 
>>> uppercase letter".)
>>
>> Yeah, but that's just the standard being greedy. No common implementation
>> has error macros which include an underscore.
> 
> I'll take your word for that, but every conforming implementation does
> have macros that start with a E and which do include an underscore
> (EXIT_SUCCESS and EXIT_FAILURE).

Right. But those *will* exist if <stdlib.h> is included.

[So does this mean that the standard conflicts with itself? A literal
reading of 7.26.3 suggests that <errno.h> is allowed to define those
macros; does this mean that including both <errno.h> and <stdlib.h>
invokes UB?]

But avoiding any (purely upper-case) macro starting with the most
common letter in the English language simply because the standard says
that it *might* be used by an implementation is overkill.

It *could* happen, although in terms of probability, I'd be more concerned
about being struck by lightning, hit by a meteorite, mauled by an escaped
tiger, etc.

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Return value for error pozz <pozzugno@gmail.com> - 2011-05-03 01:31 -0700
  Re: Return value for error jacob navia <jacob@spamsink.net> - 2011-05-03 10:46 +0200
  Re: Return value for error Ike Naar <ike@otaku.freeshell.org> - 2011-05-03 09:04 +0000
    Re: Return value for error Ian Collins <ian-news@hotmail.com> - 2011-05-03 21:19 +1200
  Re: Return value for error James Kuyper <jameskuyper@verizon.net> - 2011-05-03 06:26 -0400
    Re: Return value for error Keith Thompson <kst-u@mib.org> - 2011-05-03 12:03 -0700
      Re: Return value for error "Kleuskes & Moos" <kleuske@xs4all.nl> - 2011-05-04 05:15 -0700
        Re: Return value for error Keith Thompson <kst-u@mib.org> - 2011-05-04 08:26 -0700
          Re: Return value for error "Kleuskes & Moos" <kleuske@xs4all.nl> - 2011-05-04 17:08 -0700
            Re: Return value for error Keith Thompson <kst-u@mib.org> - 2011-05-04 17:54 -0700
              Re: Return value for error "Kleuskes & Moos" <kleuske@xs4all.nl> - 2011-05-05 12:03 -0700
  Re: Return value for error James Dow Allen <jdallen2000@yahoo.com> - 2011-05-03 03:45 -0700
    Re: Return value for error Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-05-03 20:50 +0000
  Re: Return value for error pete <pfiland@mindspring.com> - 2011-05-03 07:50 -0400
    Re: Return value for error Keith Thompson <kst-u@mib.org> - 2011-05-03 12:04 -0700
  Re: Return value for error Martin Ambuhl <mambuhl@earthlink.net> - 2011-05-03 07:59 -0400
  Re: Return value for error Mark Storkamp <mstorkamp@yahoo.com> - 2011-05-03 08:46 -0500
  Re: Return value for error Stephen Sprunk <stephen@sprunk.org> - 2011-05-03 10:13 -0500
    Re: Return value for error William Ahern <william@wilbur.25thandClement.com> - 2011-05-03 13:08 -0700
  Re: Return value for error Kenneth Brody <kenbrody@spamcop.net> - 2011-05-03 13:23 -0400
    Re: Return value for error Peter Nilsson <airia@acay.com.au> - 2011-05-03 16:01 -0700
    Re: Return value for error Nobody <nobody@nowhere.com> - 2011-05-05 07:21 +0100
      Re: Return value for error Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-05-05 15:13 +0100
        Re: Return value for error Nobody <nobody@nowhere.com> - 2011-05-06 03:51 +0100
          Re: Return value for error James Kuyper <jameskuyper@verizon.net> - 2011-05-05 23:38 -0400
      Re: Return value for error Keith Thompson <kst-u@mib.org> - 2011-05-05 08:44 -0700
        Re: Return value for error Seebs <usenet-nospam@seebs.net> - 2011-05-05 20:49 +0000
          Re: Return value for error Keith Thompson <kst-u@mib.org> - 2011-05-05 14:10 -0700
            Re: Return value for error Seebs <usenet-nospam@seebs.net> - 2011-05-06 00:26 +0000
  Re: Return value for error Keith Thompson <kst-u@mib.org> - 2011-05-03 12:09 -0700

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