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


From: Jim Meyering
Subject: Re: [bug-grep] Re: length of dec. representation of a number
Date: Thu, 10 Mar 2005 09:53:22 +0100

address@hidden (Paul Jarc) wrote:
> 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)

Technically, yes, but that would prohibit applying that macro
to variables, which is useful.  Currently there are uses like
that in the coreutils.




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