from atof(2):

     BUGS
          Atoi, atol, and atoll accept octal and hexadecimal numbers
          in the style of C, contrary to the ANSI specification.


On Mon, Mar 11, 2013 at 3:09 PM, Bakul Shah <bakul@bitblocks.com> wrote:

> The atol() manpage says:
>
>           Atoi and atol recognize an optional string of tabs and
>           spaces, then an optional sign, then a string of decimal dig-
>           its.
>
> And yet atol(x) acts exactly like strol(x, nil, 0). This makes
> it unnecessarily incompatible with the unix version.  Ditto
> for atoll(). My preference would be to fix the code and not
> the man page.
>
>