How do I make a case insensitive compare between two Unicode characters or strings under Windows in C/C++?

Question

I'm looking for a way of doing a insensitive compare of two Unicode characters (char32) under Windows (C/C++, not .NET).

I am aware that the solution is supposed to be locale aware.

I would like a solution that would not require additional third-party libraries.

Answer 1

My first thought is that you should lookup CompareStringEx with its parameters LOCALE_INVARIANT and NORM_IGNORECASE.

Answer 2

Whoops, you want to compare char32s. Ignore my post.

My original answer

For posterity:

You can use

_wcsicmp(const wchar_t *string1, const wchar_t *string2) or

_mbsicmp(const unsigned char_t *string1, const unsigned char *string2)

the former compares wide characters (usually UTF-16) and the latter compares multi-byte characters (usually UTF-8). You need to set the code page using

_setmbcp(int codepage)