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Message-ID: <b533e91d-5e91-4fd3-8ea1-c1ac0b257485@towo.net>
Date: Tue, 30 Sep 2025 08:44:49 +0200
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Subject: Re: cygwin 3.6.4 breaks mbrtowc
To: cygwin AT cygwin DOT com
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Precedence: list
From: Thomas Wolff via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Thomas Wolff <towo AT towo DOT net>
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Errors-To: cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com
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Am 30.09.2025 um 00:52 schrieb Mark Geisert via Cygwin:
> Hello Thomas,
> Apologies for the late response to your report.
Thanks, I actually had feedback on the issue. From Corinna in another 
thread I guess.
>
> On 7/21/2025 8:25 PM, Thomas Wolff via Cygwin wrote:
>> mbrtowc is broken in 3.6.4 which breaks non-BMP display in mintty.
>> Test case below.
>> Thomas
>>
>> #include <locale.h>
>> #include <wchar.h>
>> #include <stdio.h>
>>
>> void mb(unsigned char c)
>> {
>>    wchar_t wc;
>>    int ret = mbrtowc(&wc, &c, 1, 0);
>>    printf("%02X -> %04X : %d\n", c, wc, ret);
>> }
>>
>> void main ()
>> {
>>    setlocale (LC_CTYPE, "");
>>
>>    mb(0xF0);
>>    mb(0x9F);
>>    mb(0x98);
>>    mb(0x8E);
>> }
>
> Running your testcase gives different output between 3.6.4 and 
> 3.7.0-dev-139 but I'm unsure the latter is correct.  Can you comment 
> please?
The issue was fixed soon already and it works in 3.7.0 test releases.
Furthermore, mintty 3.8.1 has a workaround for it so it works also in 
3.6.4, but only for UTF-8 encoding, not for CJK multibyte encodings 
where the issue also hits.

>
> On 3.6.4:
> ~ ./a
> F0 -> 0000 : -2
> 9F -> 0000 : -2
> 98 -> 0000 : -2
> 8E -> D83D : 3
>
> On 3.7.0-dev-139:
> ~ ./a
> F0 -> 0000 : -2
> 9F -> 0000 : -2
> 98 -> D83D : 1
> 8E -> DE0E : 1
>
> Thanks much,
>
> ..mark
>


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