Re: strtonum(3) from OpenBSD?

[Roy Marples <roy%marples.name@localhost>]

David Laight wrote:
> On Mon, Jun 29, 2009 at 11:41:04PM -0400, James K. Lowden wrote:
> > I fail to see how sscanf(3) is more error prone than strtonum().  No
> > matter what, you have to specify -- via the name or the format string --
> > the format of the input and of the receiving buffer.  At least with
> > sscanf(3) that's *all* you have to do.
>
> Correct use of sscanf() for a single integer is something like:
>
>         count = sscanf(inbuf, "%i%n", &int_val, &byte_count);
>         if (count != 2 || inbuf[byte_count] != 0)
>                 /* Conversion error */
>
> I'm not sure that it is possible to detect numeric overflow.

Using the standard, it's not.
GNU libc sets ERANGE if the conversion overflows, I see no reason why we 
could not do similar.

Thanks

Roy