From: Pavel Vasilyev <pavel@pavlinux.ru>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Pavel Machek <pavel@ucw.cz>, Len Brown <lenb@kernel.org>,
linux-acpi@vger.kernel.org, linux-pm@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, Len Brown <len.brown@intel.com>
Subject: Re: [linux-pm] [PATCH] ACPI: replace strlen("string") with sizeof("string") -1
Date: Tue, 07 Aug 2012 05:07:06 +0400 [thread overview]
Message-ID: <50206A3A.8020706@pavlinux.ru> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1208061556010.1649-100000@iolanthe.rowland.org>
06.08.2012 23:59, Alan Stern пишет:
> On Mon, 6 Aug 2012, Pavel Vasilyev wrote:
>
>>>> http://www.gossamer-threads.com/lists/engine?do=post_attachment;postatt_id=41157;list=linux
>>>
>>> Interestingly, many (all?) of the changes in that patch are wrong
>>> because they don't try to match the terminating '\0'. As a result,
>>> they will match against extensions of the target string as well as the
>>> target string itself.
>>>
>>
>> strNcmp compare N bytes - http://lxr.linux.no/#linux+v3.5/lib/string.c#L270
>> memcmp compare N bytes - http://lxr.linux.no/#linux+v3.5/lib/string.c#L651
>
> Yes. So if s contains "abcde" then
>
> memcmp(s, "abc", 3) and strncmp(s, "abc", 3) will both return 0, and
> memcmp(s, "abc", 4) and strncmp(s, "abc", 4) will both return 1.
No matter what is contained in *s, "abcde" or "abcxxx",
are important first N bytes. The second example, you see,
a little bit stupid, and devoid of logic. :)
--
Pavel.
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WARNING: multiple messages have this Message-ID (diff)
From: Pavel Vasilyev <pavel@pavlinux.ru>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Pavel Machek <pavel@ucw.cz>, Len Brown <lenb@kernel.org>,
linux-acpi@vger.kernel.org, linux-pm@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, Len Brown <len.brown@intel.com>
Subject: Re: [linux-pm] [PATCH] ACPI: replace strlen("string") with sizeof("string") -1
Date: Tue, 07 Aug 2012 05:07:06 +0400 [thread overview]
Message-ID: <50206A3A.8020706@pavlinux.ru> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1208061556010.1649-100000@iolanthe.rowland.org>
06.08.2012 23:59, Alan Stern пишет:
> On Mon, 6 Aug 2012, Pavel Vasilyev wrote:
>
>>>> http://www.gossamer-threads.com/lists/engine?do=post_attachment;postatt_id=41157;list=linux
>>>
>>> Interestingly, many (all?) of the changes in that patch are wrong
>>> because they don't try to match the terminating '\0'. As a result,
>>> they will match against extensions of the target string as well as the
>>> target string itself.
>>>
>>
>> strNcmp compare N bytes - http://lxr.linux.no/#linux+v3.5/lib/string.c#L270
>> memcmp compare N bytes - http://lxr.linux.no/#linux+v3.5/lib/string.c#L651
>
> Yes. So if s contains "abcde" then
>
> memcmp(s, "abc", 3) and strncmp(s, "abc", 3) will both return 0, and
> memcmp(s, "abc", 4) and strncmp(s, "abc", 4) will both return 1.
No matter what is contained in *s, "abcde" or "abcxxx",
are important first N bytes. The second example, you see,
a little bit stupid, and devoid of logic. :)
--
Pavel.
next prev parent reply other threads:[~2012-08-07 1:07 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-30 5:07 ACPI & Power Management Patches for Linux 3.5-rc4 Len Brown
2012-06-30 5:07 ` [PATCH 1/8] ACPI sysfs.c strlen fix Len Brown
2012-06-30 5:07 ` [PATCH 2/8] ACPI, x86: fix Dell M6600 ACPI reboot regression via DMI Len Brown
2012-06-30 5:07 ` Len Brown
2012-07-06 11:09 ` Ingo Molnar
2012-06-30 5:07 ` [PATCH 3/8] ACPI: Make acpi_skip_timer_override cover all source_irq==0 cases Len Brown
2012-06-30 5:07 ` Len Brown
2012-06-30 5:07 ` [PATCH 4/8] ACPI: Remove one board specific WARN when ignoring timer overriding Len Brown
2012-06-30 5:07 ` Len Brown
2012-06-30 5:07 ` [PATCH 5/8] ACPI: Add a quirk for "AMILO PRO V2030" to ignore the " Len Brown
2012-06-30 5:07 ` Len Brown
2012-06-30 5:07 ` [PATCH 6/8] ACPI, APEI, Avoid too much error reporting in runtime Len Brown
2012-06-30 5:07 ` Len Brown
2012-06-30 5:07 ` [PATCH 7/8] ACPI video: Still use ACPI backlight control if _DOS doesn't exist Len Brown
2012-06-30 5:07 ` [PATCH 8/8] acpi_pad: fix power_saving thread deadlock Len Brown
2012-06-30 5:07 ` Len Brown
2012-06-30 14:25 ` [PATCH 1/8] ACPI sysfs.c strlen fix Alan Stern
2012-06-30 14:25 ` [linux-pm] " Alan Stern
2012-07-27 1:39 ` [PATCH] ACPI: replace strlen("string") with sizeof("string") -1 Len Brown
2012-07-27 1:39 ` Len Brown
2012-07-30 14:26 ` Ian Campbell
2012-07-30 14:41 ` richard -rw- weinberger
2012-08-06 10:21 ` [linux-pm] " Pavel Machek
2012-08-06 14:36 ` Alan Stern
2012-08-06 14:36 ` [linux-pm] " Alan Stern
2012-08-06 16:00 ` Pavel Vasilyev
2012-08-06 16:28 ` Alan Stern
2012-08-06 16:28 ` [linux-pm] " Alan Stern
2012-08-06 18:47 ` Pavel Vasilyev
2012-08-06 19:59 ` Alan Stern
2012-08-06 19:59 ` [linux-pm] " Alan Stern
2012-08-06 22:57 ` Daniel Taylor
2012-08-07 13:19 ` Bernd Petrovitsch
2012-08-07 13:19 ` [linux-pm] " Bernd Petrovitsch
2012-08-08 0:59 ` Daniel Taylor
2012-08-07 1:07 ` Pavel Vasilyev [this message]
2012-08-07 1:07 ` Pavel Vasilyev
2012-08-07 17:24 ` Alan Stern
2012-08-07 17:24 ` [linux-pm] " Alan Stern
2012-08-07 23:23 ` Pavel Vasilyev
2012-08-08 1:27 ` Alan Stern
2012-08-08 1:27 ` Alan Stern
2012-08-06 10:26 ` Andreas Schwab
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