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From: Thomas Wolff via Cygwin <cygwin AT cygwin DOT com>
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Am 23.07.2025 um 09:53 schrieb Corinna Vinschen via Cygwin:
> On Jul 23 05:44, Thomas Wolff via Cygwin wrote:
>> 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?
> Yeah, I see the problem.  One of the slightly puzzeling behaviours
> of mbsnrtowcs is the fact that the src pointer stays at the start of
> the invalid sequence.  I think the idea is to skip the invalid sequence
> byte-wise until wcsnrtombs reports a valid sequence again.
But an incomplete sequence could still be completed to become a valid 
sequence...
So I could check a maximum length of bytes, say, with high bit set. Not 
sure whether that works for other multibyte encodings, certainly not for 
GB18030.

> What bugs me is that we have the choice between a broken mbrtowc on
> one side and a chance to generate broken filenames on the other side.
I did not look into those details, but while characters to be handled by 
a terminal come sequentially as a stream, filenames can be handled as a 
compound string, isn't that easier to check?

> I think we should actually revert fa272e05bbd0 ("wcstombs: also call
> __WCTOMB on terminating NUL if output buffer is NULL") and see if we can
> fix the filename issue in the Cygwin functions for filename conversion
> alone.
>
> Any ideas appreciated.
>
>
> Corinna
>


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