The strncasecmp function is case-insensitive. The returned
    lexicographic difference reflects a conversion to lowercase.
    The strncasecmp function is similar to the strcasecmp function,
    but also compares size. If the size specified by n is read before
    a NULL, the comparison stops.

    The strcasecmp function works for 7-bit ASCII compares only. Do
    not use this function for internationalized applications.