C programming: How to program for Unicode?

Question

What prerequisites are needed to do strict Unicode programming?

Does this imply that my code should not use char types anywhere and that functions need

Answer 1

To do strict Unicode programming:

• Only use string APIs that are Unicode aware (NOT strlen, strcpy, ... but their widestring counterparts wstrlen, wsstrcpy, ...)
• When dealing with a block of text, use an encoding that allows storing Unicode chars (utf-7, utf-8, utf-16, ucs-2, ...) without loss.
• Check that your OS default character set is Unicode compatible (ex: utf-8)
• Use fonts that are Unicode compatible (e.g. arial_unicode)

Multi-byte character sequences is an encoding that pre-dates the UTF-16 encoding (the one used normally with wchar_t) and it seems to me it is rather Windows-only.

I've never heard of wint_t.