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From:	Thomas Wolff via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Thomas Wolff <towo AT towo DOT net>
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Am 24.07.2025 um 17:35 schrieb Corinna Vinschen:
> Thomas,
>
> On Jul 23 05:44, Thomas Wolff via Cygwin wrote:
>>>> Am 22.07.2025 um 15:05 schrieb Corinna Vinschen:
>>>>> mbrtowc() is inherently a bad idea when it comes to UTF-16. It's a
>>>>> function which only works really correctly for the unicode base plane,
>>>>> or if wchar_t is big enough.
>>>>>
>>>>> It's the reason we don't use mbrtowc() if possible.  It's better
>>>>> to call
>>>>> mbstowcs() or friends and allow at least 3 chars in the wchar_t buffer.
>>>>> You can't change that in mintty by any chance?
>>> [...]
>> OK, suppose I'd consider to switch to mbs[[n]r]towcs, collecting bytes until
>> the function gives me a result.
>> This would work fine as long as I receive only valid sequences. But look at
>> input string test case
>> char nonbmp[] = {0xF8, 0x88, 0x8A, 0xAF, 0x2D, 0}; // an invalid sequence
>> followed by a valid char
>> The functions only return -1 and (in the case of mbsnrtowcs) do not advance
>> the input pointer.
>> So how am I supposed to recognize that the invalid sequence has ended and a
>> valid character has arrived?
> Apart from that, you probably still have a problem in mintty: GB18030.
>
> The problem with GB18030 is, that you need all four bytes to generate
> the high surrogate.
>
> Consider the following GB18030 string: 0x90 0x30 0x81 0x30
>
> This string translates into a UTF-16 surrogate pair: 0xd800 0xdc00.
>
> If you run a tweaked version of your test applicaton from
> https://cygwin.com/pipermail/cygwin/2025-July/258513.html:
>
>    setlocale (LC_CTYPE, "zh_CN.gb18030");
>    mb (0x90);
>    mb (0x30);
>    mb (0x81);
>    mb (0x30);
>
> Then the output is:
>
>    90 -> 0000 : -2
>    30 -> 0000 : -2
>    81 -> 0000 : -2
>    30 -> D800 : 0
>
> However, if you notice this situation...
>
>    if (ret_from_mbrtowc == 0 && codeset == gb18030
>        && (pwc & 0xfc00) == 0xd800)
>
> ...you can just add a fake NUL byte:
>
>      mbrtowc (&wc, '\0', 1, &mbstate);
>
> If you do that, the above sequence becomes:
>
>    90 -> 0000 : -2
>    30 -> 0000 : -2
>    81 -> 0000 : -2
>    30 -> D800 : 0
>    00 -> DC00 : 1
>
> I hope this helps, if you didn't already handle GB18030 differently
> in mintty.
Oooff. No, I didn't. So that is already before 3.6.4 (and again 3.6.5), 
right?
Thanks for the notice, I'll check and test your workaround.
Thomas

> Corinna


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