Re: check_strxfrm_bug()

On 10.07.23 04:51, Thomas Munro wrote:
> On Sun, Jul 9, 2023 at 6:35 PM Thomas Munro <thomas(dot)munro(at)gmail(dot)com> wrote:
>> On Sun, Jul 9, 2023 at 6:20 PM Peter Eisentraut <peter(at)eisentraut(dot)org> wrote:
>>> So I don't think this code is correct. AFAICT, there is nothing right
>>> now that can possibly define HAVE_MBSTOWCS_L on Windows/MSVC. Was that
>>> the intention?
>>
>> Yes, that was my intention. Windows actually doesn't have them.
>
> Thinking about that some more... Its _XXX implementations don't deal
> with UTF-8 the way Unix-based developers would expect, and are
> therefore just portability hazards, aren't they? What would we gain
> by restoring the advertisement that they are available? Perhaps we
> should go the other way completely and remove the relevant #defines
> from win32_port.h, and fully confine knowledge of them to pg_locale.c?
> It knows how to deal with that. Here is a patch trying this idea
> out, with as slightly longer explanation.

This looks sensible to me.

If we ever need mbstowcs_l() etc. outside of pg_locale.c, then the
proper way would be to make a mbstowcs_l.c file in src/port/.

But I like your approach for now because it moves us more firmly into
the direction of having it contained in pg_locale.c, instead of having
some knowledge global and some local.