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

[Aharon Robbins]

> Date: Thu, 24 Feb 2005 14:54:09 +0100
> From: Stepan Kasal <address@hidden>
> Subject: [bug-grep] length of dec. representation of a number
> To: address@hidden
>
>
> Hello,
>   I'm going to check in the following small patch.
> Stepan
>
> -  char buf[sizeof pos * CHAR_BIT];
> +  char buf[(sizeof pos + 1) / 2 * 5 + 1];  /* log_10(2^16) < 5 */

Ahem.  Try something like this, please?

        #define MAX_DEC_DIGITS_FOR(VAR)  ((sizeof VAR + 1) / 2 * 5 + 1) /* 
log_10(2^16) << 5 */

(I assume that in the comment you meant `<< 5' and not `< 5' which is
a boolean test.)  Then:

        char buf[MAX_DEC_DIGITS_FOR(pos)];

and

        char buf[MAX_DEC_DIGITS_FOR(uintmax_t)];

Really, you should know better.

Arnold