Stepan Kasal:
+ /* only called from console_thread, so a static buffer will do */ + static wchar_t wbuf[2 * BUFFER_SIZE + 1];
Wouldn't BUFFER_SIZE + 1 (or even BUFFER_SIZE) do here? If you convert from up to BUFFER_SIZE octets of UTF-8 input, you should never get back more than BUFFER_SIZE code units of UTF-16 output. Worst case would be ASCII, which is one UTF-16 code unit per UTF-8 octet, everything else is less (non-BMP is four UTF-8 octets mapping to two UTF-16 code units).
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