c
SSIZE_T ConvertUtf8NToWChar(const char* str, size_t len, WCHAR* wstr, size_t wlen)
{
    if (str == NULL)
    {
        // Handle NULL pointer, e.g., return an error code or a default value
        return 0; // or some other default value
    }
    size_t ilen = strnlen(str, len);
    // ... rest of the function remains the same ...
}
