在 2025-6-3 19:11, Kirill Makurin 写道:
Oh, my bad. I was thinking I was calling MSVCRT's `btowc`, not the replacement.I tried calling real `btowc` and its behavior matches UCRT. I also tried loading msvcr100.dll, it has the same behavior.So, I think we could check return value of `___lc_codepage_func()` and for "C" locale, return values in range [0,255] as is and return WEOF if value is outside this range.Should we change behavior so that replacement is used only when there is no real `btowc`? I do not fully understand how this mechanism works.Btw, glibc's `btowc` returns WEOF for characters in range [128,255] with "C" locale. The behavior of btowc not returning WEOF for values in range [128,255] seems to be new. Existing manpages do not mention it.
This? https://man7.org/linux/man-pages/man3/btowc.3p.html#RETURN_VALUE If you can find the rationale about the glibc change, I think it's fine to adopt the POSIX behavior. -- Best regards, LIU Hao
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