wcwidth9

platform independent, header only, wcwidth with full unicode 9 support

This code is primarily derived from the neovim project. The tables were produced from parsing the official unicode files EastAsianWidth.txt and emoji-data.txt using genunicodetables.lua.

Simply include wcwidth9.h in your project and use the wcwidth9 function. It works just like wcwidth.

int wcwidth9(int c);

The input value c is expected to be a unicode code point value. The widths returned are according to unicode version 9.0.0.

Return values:

• 1 or 2: the width of the character
• -1: non-printable, combining or unassigned character
• -2: ambiguous width character
• -3: private-use character

Ambiguous width characters should almost always be considered width 1 except in the context of some East Asian languages as described here.

As private-use characters may not necessarily need to vary depending on East Asian context, but are still considered ambiguous, a separate return value is provided to distinguish them.