wString = (int *) (Tcl_DStringValue(dsPtr) + oldLength);

    w = wString;
    p = src;
    endPtr = src + length;
    optPtr = endPtr - 4;
    while (p <= optPtr) {
	p += Tcl_UtfToUniChar(p, &ch);
	*w++ = ch;
    }
    while ((p < endPtr) && Tcl_UtfCharComplete(p, endPtr-p)) {
	p += Tcl_UtfToUniChar(p, &ch);
	*w++ = ch;
    }
    while (p < endPtr) {
	*w++ = UCHAR(*p++);
    }
    *w = '\0';
    Tcl_DStringSetLength(dsPtr,

const char *
Tcl_UtfFindFirst(
    const char *src,		/* The UTF-8 string to be searched. */
    int ch)			/* The Unicode character to search for. */
{
    while (1) {
	int find, len = Tcl_UtfToUniChar(src, &find);

	if (find == ch) {
	    return src;
	}
	if (*src == '\0') {
	    return NULL;
	}

Tcl_UtfFindLast(
    const char *src,		/* The UTF-8 string to be searched. */
    int ch)			/* The Unicode character to search for. */
{
    const char *last = NULL;

    while (1) {
	int find, len = Tcl_UtfToUniChar(src, &find);

	if (find == ch) {
	    last = src;
	}
	if (*src == '\0') {
	    break;
	}

    if (index < 0) {
	return -1;
    }
    while (index--) {
	i = TclUtfToUniChar(src, &ch);
	src += i;
    }
    Tcl_UtfToUniChar(src, &i);
    return i;
}

/*
 *---------------------------------------------------------------------------
 *
 * Tcl_UtfAtIndex --

Tcl_UtfAtIndex(
    const char *src,	/* The UTF-8 string. */
    Tcl_Size index)	/* The position of the desired character. */
{
    Tcl_UniChar ch = 0;

    while (index-- > 0) {
	src += Tcl_UtfToUniChar(src, &ch);
    }
    return src;
}

const char *
TclUtfAtIndex(
    const char *src,	/* The UTF-8 string. */

    /*
     * Iterate over the string until we hit the terminating null.
     */

    src = dst = str;
    while (*src) {
	len = Tcl_UtfToUniChar(src, &ch);
	upChar = Tcl_UniCharToUpper(ch);

	/*
	 * To keep badly formed Utf strings from getting inflated by the
	 * conversion (thereby causing a segfault), only copy the upper case
	 * char to dst if its size is <= the original char.
	 */

    /*
     * Iterate over the string until we hit the terminating null.
     */

    src = dst = str;
    while (*src) {
	len = Tcl_UtfToUniChar(src, &ch);
	lowChar = Tcl_UniCharToLower(ch);

	/*
	 * To keep badly formed Utf strings from getting inflated by the
	 * conversion (thereby causing a segfault), only copy the lower case
	 * char to dst if its size is <= the original char.
	 */

     * Capitalize the first character and then lowercase the rest of the
     * characters until we get to a null.
     */

    src = dst = str;

    if (*src) {
	len = Tcl_UtfToUniChar(src, &ch);
	titleChar = Tcl_UniCharToTitle(ch);

	if (len < TclUtfCount(titleChar)) {
	    memmove(dst, src, len);
	    dst += len;
	} else {
	    dst += Tcl_UniCharToUtf(titleChar, dst);
	}
	src += len;
    }
    while (*src) {
	len = Tcl_UtfToUniChar(src, &ch);
	lowChar = ch;
	/* Special exception for Georgian Asomtavruli chars, no titlecase. */
	if ((unsigned)(lowChar - 0x1C90) >= 0x30) {
	    lowChar = Tcl_UniCharToLower(lowChar);
	}

	if (len < TclUtfCount(lowChar)) {