if (k_check && d < 1. && ilim > 0) {
	if (ilim1 < 0) {
	    return NULL;
	}
	ilim = ilim1;
	--k;
	d = d * 10.0;
	++ieps;
    }

    /*
     * Compute estimated roundoff error.
     */

    eps.d = ieps * d + 7.;
    eps.w.word0 -= (FP_PRECISION-1) << EXP_SHIFT;

    /*
     * Handle the peculiar case where the result has no significant digits.
     */

    retval = (char *)Tcl_Alloc(len + 1);
    if (ilim == 0) {
	d = d - 5.;
	if (d > eps.d) {
	    *retval = '1';
	    *decpt = k;
	    return retval;
	} else if (d < -eps.d) {
	    *decpt = k;
	    return retval;