int
Tcl_NumUtfChars(
    register const char *src,	/* The UTF-8 string to measure. */
    int length)			/* The length of the string in bytes, or -1
				 * for strlen(string). */
{
    Tcl_UniChar ch;

    register int i;

    /*
     * The separate implementations are faster.
     *
     * Since this is a time-sensitive function, we also do the check for the
     * single-byte char case specially.
     */

    i = 0;
    if (length < 0) {
	while (*src != '\0') {
	    src += TclUtfToUniChar(src, &ch);
	    i++;
	}
	if (i < 0) i = INT_MAX; /* Bug [2738427] */
    } else {
	register const char *endPtr = src + length - TCL_UTF_MAX;

	while (src < endPtr) {




	    src += TclUtfToUniChar(src, &ch);

	    i++;
	}
	endPtr += TCL_UTF_MAX;
	while ((src < endPtr) && Tcl_UtfCharComplete(src, endPtr - src)) {
	    src += TclUtfToUniChar(src, &ch);
	    i++;
	}
	if (src < endPtr) {
	    i += endPtr - src;
	}
    }
    return i;
}

/*
 *---------------------------------------------------------------------------