From owner-cvs-all  Thu Dec 27  9:36:15 2001
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Date: Fri, 28 Dec 2001 04:35:43 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: "Andrey A. Chernov" <ache@nagual.pp.ru>
Cc: Bill Fenner <fenner@research.att.com>,
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Subject: Re: cvs commit: src/lib/libc/stdlib atof.c atoi.c atol.3 atol.c
 atoll.c
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On Thu, 27 Dec 2001, Andrey A. Chernov wrote:

> On Wed, Dec 26, 2001 at 17:41:16 -0800, Bill Fenner wrote:
> >
> > >   "The  functions  atof,  atoi,  atol, and atoll need not
> > >   affect the value of  the  integer  expression  errno  on  an
> > >   error.   If  the  value of the result cannot be represented,
> >
> > I would have read "need not" as "are not required to", i.e. they are
> > permitted to.  Since they're also permitted not to, this change is
> > also conformant.

Yes, the change just a pessimization.  I complained about it.

>
> I additionally check POSIX and SUSv2 in that area, both have
>
> ERRORS
> 	No errors defined
>
> section which means that no any errno producing allowed.

No, this means the same as the C standard: errors have no defined effect
on errno.  It is just poorly worded.  At least in the C standard, even
non-errors may affect errno for any function unless the documentation of
the function explicitly says otherwise.  POSIX does say otherwise in some
cases where it wants to require more than the C standard (e.g., for
strerror()), so I assume that it follows this rule.

> As I believe,
> initially, when ato*() was not implemented via strto*() but use their own
> way, there was no errno changes in them.

Yes.  The V7 manual has atof() but not strtod(), and doesn't mention any
error numbers for atof().

Bruce


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