https://docs.microsoft.com/zh-cn/cpp/c-runtime-library/c-run-time-library-reference
http://pubs.opengroup.org/onlinepubs/009695399/basedefs/wchar.h.html
http://www.jb51.net/books/434960.html
https://docs.microsoft.com/zh-cn/cpp/c-runtime-library/c-run-time-library-reference
http://pubs.opengroup.org/onlinepubs/009695399/basedefs/wchar.h.html
http://www.jb51.net/books/434960.html