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This is a preparation for P2093R14 Formatted output When the output of print is to the terminal it needs to use the native API. This means transcoding UTF-8 to UTF-16 on Windows. The encoder's interface is modeled after P2728 Unicode in the Library, Part 1: UTF Transcoding But only the required part for P2093R14 is implemented. On Windows wchar_t is 16 bits, in order to test on platforms where wchar_t is 32 bits the transcoder has support for char16_t. It also adds and UTF-8 to UTF-32 encoder which is useful for other tests. Note it is possible to use <codecvt> for transcoding, but that header is deprecated. So rather write new code that is not deprecated; the hard part, decoding, has already been done. The <codecvt> header also requires locale support while the new code works without including <locale>. Note the current transcoder implementation can be optimized since it basically does UTF-8 -> UTF-32 -> UTF-16. The first goal is to have a working implementation. Since it's not part of the ABI it's possible to do the optimization later. Depends on D149672 Reviewed By: ldionne, tahonermann, #libc Differential Revision: https://reviews.llvm.org/D150031
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