[Bug locale/25744] mbrtowc with Big5-HKSCS returns 2 instead of 1 when consuming the second byte of certain double byte characters

["carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25744

Carlos O'Donell <carlos at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW
                 CC|                            |carlos at redhat dot com
   Last reconfirmed|                            |2020-03-29

--- Comment #1 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Tom Honermann from comment #0)
> 2nd mbrtowc call:
>   result: 2 (1 expected, glibc returns 2)
>   wc: 0x00CA (0x00CA expected)

> As noted in the code comments and process output, the return value for the
> second call to mbrtowc() is unexpected.

My opinion is that this is an implementation defect in the converter which has
absolute control over how those return values are computed.

My worry though is that changing this now might break existing code that is out
there that is using BIG5HKSCS.

If that's actually the case then we could create a distinct gconv module with
the old behaviour and release that.

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