int
Tcl_UniCharNcmp(
    const Tcl_UniChar *ucs,	/* Unicode string to compare to uct. */
    const Tcl_UniChar *uct,	/* Unicode string ucs is compared to. */
    unsigned long numChars)	/* Number of unichars to compare. */
{
#if defined(WORDS_BIGENDIAN) && (TCL_UTF_MAX != 4)
    /*
     * We are definitely on a big-endian machine; memcmp() is safe
     */

    return memcmp(ucs, uct, numChars*sizeof(Tcl_UniChar));

#else /* !WORDS_BIGENDIAN */
    /*
     * We can't simply call memcmp() because that is not lexically correct.
     */

    for ( ; numChars != 0; ucs++, uct++, numChars--) {
	if (*ucs != *uct) {
#if TCL_UTF_MAX == 4
	    /* special case for handling upper surrogates */
	    if (((*ucs & 0xFC00) == 0xD800) && ((*uct & 0xFC00) != 0xD800)) {
		return 1;
	    } else if (((*uct & 0xFC00) == 0xD800)) {
		return -1;
	    }
#endif
	    return (*ucs - *uct);
	}
    }
    return 0;
#endif /* WORDS_BIGENDIAN */
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_UniCharNcasecmp --
 *

{
    for ( ; numChars != 0; numChars--, ucs++, uct++) {
	if (*ucs != *uct) {
	    Tcl_UniChar lcs = Tcl_UniCharToLower(*ucs);
	    Tcl_UniChar lct = Tcl_UniCharToLower(*uct);

	    if (lcs != lct) {
#if TCL_UTF_MAX == 4
	    /* special case for handling upper surrogates */
	    if (((lcs & 0xFC00) == 0xD800) && ((lct & 0xFC00) != 0xD800)) {
		return 1;
	    } else if (((lct & 0xFC00) == 0xD800)) {
		return -1;
	    }
#endif
		return (lcs - lct);
	    }
	}
    }
    return 0;
}