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From: Cyril Hrubis <chrubis@suse.cz>
To: Petr Vorel <pvorel@suse.cz>
Cc: ltp@lists.linux.it, linux-nfs@vger.kernel.org,
	Andrea Cervesato <andrea.cervesato@suse.com>
Subject: Re: [PATCH 1/1] aiodio: Fix format string for 32bit
Date: Fri, 5 Aug 2022 11:34:31 +0200	[thread overview]
Message-ID: <YuzkJ8cwOVEEkAVT@yuki> (raw)
In-Reply-To: <20220803173211.14292-1-pvorel@suse.cz>

Hi!
> On 32bit char pointer is int and size_t is unsigned int,
> Cast to long / unsigned long.

Actually char pointer is char pointer, that is not an integer type at
all. If you do a pointer difference you end up with an signed integer
value of ptrdiff_t type, because unlike the result of sizeof(foo)
pointer difference can be negative as well. In C99 ptrdiff_t can be
printed as %td see the "Length modifier" part of man 3 printf.

-- 
Cyril Hrubis
chrubis@suse.cz

WARNING: multiple messages have this Message-ID (diff)
From: Cyril Hrubis <chrubis@suse.cz>
To: Petr Vorel <pvorel@suse.cz>
Cc: linux-nfs@vger.kernel.org, ltp@lists.linux.it
Subject: Re: [LTP] [PATCH 1/1] aiodio: Fix format string for 32bit
Date: Fri, 5 Aug 2022 11:34:31 +0200	[thread overview]
Message-ID: <YuzkJ8cwOVEEkAVT@yuki> (raw)
In-Reply-To: <20220803173211.14292-1-pvorel@suse.cz>

Hi!
> On 32bit char pointer is int and size_t is unsigned int,
> Cast to long / unsigned long.

Actually char pointer is char pointer, that is not an integer type at
all. If you do a pointer difference you end up with an signed integer
value of ptrdiff_t type, because unlike the result of sizeof(foo)
pointer difference can be negative as well. In C99 ptrdiff_t can be
printed as %td see the "Length modifier" part of man 3 printf.

-- 
Cyril Hrubis
chrubis@suse.cz

-- 
Mailing list info: https://lists.linux.it/listinfo/ltp

  reply	other threads:[~2022-08-05  9:32 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-03 17:32 [PATCH 1/1] aiodio: Fix format string for 32bit Petr Vorel
2022-08-03 17:32 ` [LTP] " Petr Vorel
2022-08-05  9:34 ` Cyril Hrubis [this message]
2022-08-05  9:34   ` Cyril Hrubis

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