CharString *Formattable::internalGetCharString(UErrorCode &status) {
    if(fDecimalStr == NULL) {
      if (fDecimalQuantity == NULL) {
        // No decimal number for the formattable yet.  Which means the value was
        // set directly by the user as an int, int64 or double.  If the value came
        // from parsing, or from the user setting a decimal number, fDecimalNum
        // would already be set.
        //
        LocalPointer<DecimalQuantity> dq(new DecimalQuantity(), status);
        if (U_FAILURE(status)) { return nullptr; }
        populateDecimalQuantity(*dq, status);
        if (U_FAILURE(status)) { return nullptr; }
        fDecimalQuantity = dq.orphan();
      }

      fDecimalStr = new CharString();
      if (fDecimalStr == NULL) {
        status = U_MEMORY_ALLOCATION_ERROR;
        return NULL;
      }
      // Older ICUs called uprv_decNumberToString here, which is not exactly the same as
      // DecimalQuantity::toScientificString(). The biggest difference is that uprv_decNumberToString does
      // not print scientific notation for magnitudes greater than -5 and smaller than some amount (+5?).
      if (fDecimalQuantity->isZero()) {
        fDecimalStr->append("0", -1, status);
      } else if (fDecimalQuantity->getMagnitude() != INT32_MIN && std::abs(fDecimalQuantity->getMagnitude()) < 5) {
        fDecimalStr->appendInvariantChars(fDecimalQuantity->toPlainString(), status);
      } else {
        fDecimalStr->appendInvariantChars(fDecimalQuantity->toScientificString(), status);
      }
    }
    return fDecimalStr;
}
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.