linux-kernel - Re: [PATCH v3 0/4] Make sscanf() stricter

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Message-ID: <ZId/IA41c2sJyvE0@itl-email>
Date:   Mon, 12 Jun 2023 16:25:01 -0400
From:   Demi Marie Obenour <demi@...isiblethingslab.com>
To:     Alexey Dobriyan <adobriyan@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Hans de Goede <hdegoede@...hat.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Lee Jones <lee@...nel.org>, Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v3 0/4] Make sscanf() stricter

On Mon, Jun 12, 2023 at 02:59:38PM +0300, Alexey Dobriyan wrote:
> > +	bool _placeholder;
> > +	return simple_strntoull(cp, INT_MAX, endp, base, &_placeholder);
> 
> This can be done without introducing dummy variables:
> 
> 	void f(bool *b)
> 	{
> 	}
> 
> 	f((bool[1]){});

This is more consise, but (at least to me) significantly less readable.

> > > lib/vsprintf.c:3727:26: error: unknown conversion type character ‘!’ in format [-Werror=format=]
> > So NAK.
> 
> Yeah, ! should go after format specifier like it does for %p.

I hadn't considered that.  Is the typical approach in Linux to use e.g.
%d%[!] if one wants a literal '!'?
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab

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