Function getUTF8ByteOffset

core/base/UTF8.cpp:432–450

}

size_t getUTF8ByteOffset(std::string_view utf8, size_t utf8CharOffset)
{
    if (utf8CharOffset >= utf8.length())
        return std::string_view::npos;

    const UTF8* source = (const UTF8*)utf8.data();
    const UTF8* sourceEnd = source + utf8.length();
    for (size_t i = 0; i < utf8CharOffset; ++i)
    {
        auto size = getUTF8SequenceSize(source, sourceEnd);
        if (size == 0)
        {
            // Invalid UTF-8 sequence found
            return std::string_view::npos;
        }
        source += size;
    }
    return static_cast<unsigned int>(source - (const UTF8*)utf8.data());
}

size_t eraseUTF8CharAt(std::string& str, size_t utf8CharOffset)
{