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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Sat, 29 May 2021 10:52:44 +0300
Message-ID: <CAHp75Vf2ZO-5XEQtzdN2ABLLC3KLDmQxGps2uD1z06Rs7L2z=w@mail.gmail.com>
Subject: Re: [PATCH] iio: si1133: fix format string warnings
To:     Joe Perches <joe@perches.com>
Cc:     Jonathan Cameron <jic23@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Arnd Bergmann <arnd@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        =?UTF-8?Q?Maxime_Roussin=2DB=C3=A9langer?= 
        <maxime.roussinbelanger@gmail.com>,
        Jean-Francois Dagenais <jeff.dagenais@gmail.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Alexandru Ardelean <alexandru.ardelean@analog.com>,
        "linux-iio@vger.kernel.org" <linux-iio@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "clang-built-linux@googlegroups.com" 
        <clang-built-linux@googlegroups.com>
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On Sat, May 29, 2021 at 12:35 AM Joe Perches <joe@perches.com> wrote:
> On Sat, 2021-05-29 at 00:16 +0300, Andy Shevchenko wrote:
> > On Saturday, May 29, 2021, Joe Perches <joe@perches.com> wrote:

...

> > > > > Likely these should be 0x%02x
> > > >
> > > > What=E2=80=99s the difference (except printing 0)?
> > >
> > > (assuming the argument is unsigned char/u8)
> > >
> > > %#02x will always emit more than the specified length (3 or 4 chars)
> > > values < 16 are 0x<hexdigit>, values >=3D 16 are 0x<hexdigit><hexdigi=
t>
> >
> > 0 will be 0, btw.
>
> Hey Andy.  Right.
>
> > > 0x%02x will always emit 4 chars
> >
> > *Minimum* or at least 4 characters. There is an upper limit of sizeof(i=
nt)
> > * 2 + 2.
>
> I did write assuming the argument is unsigned char/u8.
> For the general unsigned int arg case, you are of course correct.

Signed char also.  Basically for all signed types and unsigned int cases.

--=20
With Best Regards,
Andy Shevchenko