在 2025-6-7 00:07, Kirill Makurin 写道:
I just tested return values of UCRT's wctob in "C" locale for input in range [128,255] and it seems to do the same thing as btowc.For other locales it does best-fit conversion (when it can't convert losslessly), this why I come up with using 20127, so we would perform best-fit conversion in "C" locale. I was wrong.We could you either 28591 or range check just like in btowc. Which one would you prefer?
I think latter makes more sense; we should not do lossy conversion for the "C" locale.However I just notice that the UCRT `wbtoc()` function seems to sign-extend the result. Therefore the character `ÿ` (U+00FF) is converted to -1 which equals EOF. According to the C standard it should be zero-extended (7.29.6.1.2 The wctob function, N1570). We might want to replace this function for UCRT. bceadc54d8f32b3f14c69074892e2718eac08e3b is a good reference.
-- Best regards, LIU Hao
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