-/* Upper bound on the string length of an integer converted to string.
- 302 / 1000 is ceil (log10 (2.0)). Subtract 1 for the sign bit;
- add 1 for integer division truncation; add 1 more for a minus sign. */
-#define INT_STRLEN_BOUND(t) ((sizeof (t) * CHAR_BIT - 1) * 302 / 1000 + 2)