[bug-gnulib] Re: length of dec. representation of a number

[Paul Jarc]

Paul Eggert <address@hidden> wrote:
> /* Bound on length of the string representing an integer value or type T.
>    Subtract 1 for the sign bit if t is signed; log10 (2.0) < 146/485;
>    add 1 for integer division truncation; add 1 more for a minus sign
>    if needed.  */
> #define INT_STRLEN_BOUND(t) \
>   ((sizeof (t) * CHAR_BIT - 1) * 146 / 485 + 2)

I guess that should be:
#define INT_STRLEN_BOUND(t) \
  ((sizeof (t) * CHAR_BIT - TYPE_SIGNED(t)) * 146 / 485 + TYPE_SIGNED(t) + 1)


paul