Re: easy-to-fix bug in /dev/null driver

[Abramo Bagnara <abramo.bagnara@libero.it>]

Michal Jaegermann wrote:
> 
> On Tue, Nov 21, 2000 at 12:53:04AM +1030, Alan Kennington wrote:
> >
> > I still think that write_null() should be rewritten as:
> >
> > ===================================================
> > static ssize_t write_null(struct file * file, const char * buf,
> >                           size_t count, loff_t *ppos)
> > {
> >         return (count <= 2147483647) ? count : 2147483647;
> > }
> > ===================================================
> >
> > This would fix the problem without introducing any new errors.
> > (Unless someone change the definitions of ssize_t and size_t!!)
> 
> Someone already did.  Or, more precisely, there are platforms where
> values used in 'return' above are bogus.
> 
> Shifting 1 up by sizeof(ssize_t) * 8 - 1 and subtracting one from
> the result, in order to derive the maximal allowable value, might work.
> I do not think that we have anything with non-8 bit bytes yet.
> 

I think it's time to provide SIZE_MAX and SSIZE_MAX along with
size_t/ssize_t typedefs.

-- 
Abramo Bagnara                       mailto:abramo@alsa-project.org

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It sounds good!
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