[Ilusion9]

Does someone knows how to validate only UTF-8 strings? I want to allow only characters available on console, panels and hud messages. It seems that csgo doesn't support non utf8 characters there.

PHP Code:

bool IsMBCharValid(const char[] mbchar,int numbytes)
{
    /*
    * A blacklist of unicode characters.
    * Mostly a variation of zero-width and spaces.
    */
    int wchar = UTF8ToWChar(mbchar, numbytes);

    if (wchar == -1)
    {
        return false;
    }
}

int UTF8ToWChar(const char[] mbchar,int numbytes)
{
    static const int mask[] = { 0, 0x7F, 0x1F, 0x0F, 0x07, 0x03, 0x01 };

    if (numbytes > 6)
    {
        return -1;
    }

    // First byte minus length tag
    int wchar = (mbchar[0] & mask[numbytes]);

    for (int i = 1; i < numbytes; i++)
    {
        // Subsequent bytes must start with 10
        if ((mbchar[i] & 0xC0) != 0x80)
        {
            return -1;
        }

        wchar <<= 6; // 6 bits of data in each subsequent byte
        wchar |= (mbchar[i] & 0x3F);
    }

    return wchar;
} 


This is from smac_client and it doesn't do what I want. From what I know UTF-8 chars have max 4 bytes.

[Dragokas]

Those characters you are talking about, are also UTF-8.

You can separate ANSI / Multibyte character by calling GetCharBytes function.

Personally, I'm filtering nickname characters by removing all UTF-8 (that's possibly not correct).
+ remove all chars with code < 32.

If you look in Client Name Fixer by @CrazyHackGUT, he uses a technique of removing all characters that have a char byte length > 2. And, that's possibly a correct way, you are asking about.

For reference, here is a plugin I'm using (that's for L4D).