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Date: Mon, 24 Mar 2025 18:12:30 +0100
To: cygwin AT cygwin DOT com
Subject: Re: two bugs in getlocalename_l
Message-ID: <Z-GSfgjYaICmrYQY@calimero.vinschen.de>
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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On Mar 24 14:12, Bruno Haible via Cygwin wrote:
> Hi,
> 
> It's good to see the addition of getlocalename_l from POSIX [1] in Cygwin 3.6.0.
> 
> [1] https://pubs.opengroup.org/onlinepubs/9799919799/functions/getlocalename_l.html
> 
> However, there are two bugs:
> 
> 
>   - "If
>      the value is LC_ALL or is not a supported locale category value (see
>      <<setlocale>>), <<getlocalename_l>> shall fail."
>     No, that's now how it is specified.
>     <https://www.austingroupbugs.net/view.php?id=1220> specified it this
>     way, but <https://www.austingroupbugs.net/view.php?id=1741> added the
>     LC_ALL support.

Drat.  I implemented this prior to id=1741.  This is unfortunate.

Without LC_ALL, only a single per-thread buffer of size ENCODING_LEN+1
was required to allow LC_GLOBAL_LOCALE.

With LC_ALL and with the extra requirement that only a call to
getlocalename_l(LC_GLOBAL_LOCALE) overwrites the per-thread
LC_GLOBAL_LOCALE string buffer, we now need 2 per-thread buffers 
of size _LC_LAST * (ENCODING_LEN+1).

>   - "<<getlocalename_l>> is POSIX-1.2008 since Base Specification Issue 8"
>     No, it was introduced in POSIX-1.2024.

Yeah, that was temporary because the nameof the new standard wasn't
known at the time I added this.


Thanks,
Corinna

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