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Re: bug in ctype.h
- To: cygwin at sourceware dot cygnus dot com
- Subject: Re: bug in ctype.h
- From: "J. J. Farrell" <jjf at bcs dot org dot uk>
- Date: Mon, 13 Mar 2000 17:19:28 -0800 (PST)
> From: Chris Faylor <cgf@cygnus.com>
>
> On Mon, Mar 13, 2000 at 06:07:43PM +0100, Levente Farkas wrote:
> >
> >I thing it's a real bug in ctype.h in cygwin:
> >-------------
> >#define _U 01
> >#define _L 02
> >#define _N 04
> >#define _S 010
> >#define _P 020
> >#define _C 040
> >#define _X 0100
> >#define _B 0200
> >--------------
> >and there is no undef pair of these defines. ok you can use every
> >name with starts with _, but it's a real nightmare (the _X is the
> >worst).
>
> Um, how would you undef these? They're used in macros.
>
> It was my understanding that symbols that begin with "_" were supposed
> to be the province of a system library and are not supposed to be
> used by user programs. Or was it "__". I can never remember.
Identifiers beginning "_" followed by another "_" or an upper-case
letter are reserved in all situations. Any "ordinary" program which
uses such identifiers is incorrect. This is not a bug.
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