Inline function definitions for isdigit and isxdigit?
Florian Weimer
fweimer@redhat.com
Fri Sep 16 15:23:00 GMT 2016
On 09/16/2016 04:58 PM, Paul Eggert wrote:
> On 09/16/2016 05:06 AM, Florian Weimer wrote:
>> For isxdigit, C99 and C11 make a final determination that only '0' â¦
>> '9', 'a' ⦠'f' and 'A' ⦠'F' are hexadecimal digits.
>
> In that case, POSIX cannot override this and say that there are other
> hexadecimal digits. The POSIX spec for isxdigit says "Any conflict
> between the requirements described here and the ISO C standard is
> unintentional. This volume of POSIX.1-2008 defers to the ISO C
> standard."
POSIX says this even if there are intentional differences â¦
I suspect it's just something you have to say. Like in the old days,
when a scholar praised and affirmed the current doctrine right at the
start, but then proceeded to obliterate it in his writing.
> So even if another part of POSIX allows more symbolic names
> in the xdigit character class and this would seem to contradict C99,
> this contradiction is unintentional and the xdigit character class must
> be as specified by C99.
Yes, particularly since C99 and C11 make exceptions for locales
affecting other character classes. I think the intent on the C side is
that isxdigit is not locale-dependent at all.
Florian
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