Function EncodeUtf8Codepoint

engine/Poseidon/Foundation/Strings/Mbcs.cpp:300–345

}

int EncodeUtf8Codepoint(uint32_t codepoint, char* out, size_t outSize)
{
    if (!out || outSize == 0)
        return 0;

    if (codepoint <= 0x7F)
    {
        if (outSize < 2)
            return 0;
        out[0] = static_cast<char>(codepoint);
        out[1] = 0;
        return 1;
    }
    if (codepoint <= 0x7FF)
    {
        if (outSize < 3)
            return 0;
        out[0] = static_cast<char>(0xC0 | (codepoint >> 6));
        out[1] = static_cast<char>(0x80 | (codepoint & 0x3F));
        out[2] = 0;
        return 2;
    }
    if (codepoint <= 0xFFFF)
    {
        if (outSize < 4)
            return 0;
        out[0] = static_cast<char>(0xE0 | (codepoint >> 12));
        out[1] = static_cast<char>(0x80 | ((codepoint >> 6) & 0x3F));
        out[2] = static_cast<char>(0x80 | (codepoint & 0x3F));
        out[3] = 0;
        return 3;
    }
    if (codepoint <= 0x10FFFF)
    {
        if (outSize < 5)
            return 0;
        out[0] = static_cast<char>(0xF0 | (codepoint >> 18));
        out[1] = static_cast<char>(0x80 | ((codepoint >> 12) & 0x3F));
        out[2] = static_cast<char>(0x80 | ((codepoint >> 6) & 0x3F));
        out[3] = static_cast<char>(0x80 | (codepoint & 0x3F));
        out[4] = 0;
        return 4;
    }

    return EncodeUtf8Codepoint(0xFFFD, out, outSize);
}

} // namespace Poseidon::Foundation