- if (datum_len + *len_ptr < datum_len /* checks for overflow */
- || !(ptr = new_array(char, datum_len + *len_ptr)))
+ if (!datum_len && !extra_len)
+ extra_len = 1; /* request non-zero amount of memory */
+ if (datum_len + extra_len < datum_len /* checks for overflow */
+ || !(ptr = new_array(char, datum_len + extra_len)))