在 2025-6-7 18:40, Kirill Makurin 写道:
Thank you for details.There is msvcp60.def which exports wctob and btowc, I am not sure if I should touch it.If we don't take POSIX behavior for btowc with "C" locale for input in range [128,255], and since we replace them both for all CRTs, I think we could limit range of valid input to [0,127] to be consistent with existing implementations like glibc.Initially, the idea to allow values in range [0,255] in "C" locale was to match CRTs behavior. What do you think?
Looks like that the behavior of `btowc()` is defined as:
```
wint_t
btowc(int c)
{
if(c == EOF)
return WEOF;
wchar_t wc;
char ch = (char) c;
mbstate_t st = { 0 };
if(mbrtowc(&wc, &ch, 1, &st) != 1)
return WEOF;
return wc;
}
```
The UCRT `mbrtowc()` function doesn't fail for characters in [128,255].
--
Best regards,
LIU Hao
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