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From: Junio C Hamano <gitster@pobox.com>
To: Beat Bolli <dev+git@drbeat.li>
Cc: Johannes Schindelin <Johannes.Schindelin@gmx.de>, git@vger.kernel.org
Subject: Re: [RFC PATCH 6/6] utf8.c: avoid char overflow
Date: Mon, 09 Jul 2018 09:33:18 -0700	[thread overview]
Message-ID: <xmqqd0vwfjxt.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <0ceeb342fec1d0868b81cd64941df53c@drbeat.li> (Beat Bolli's message of "Mon, 09 Jul 2018 16:48:28 +0200")

Beat Bolli <dev+git@drbeat.li> writes:

>>> -static const char utf16_be_bom[] = {0xFE, 0xFF};
>>> -static const char utf16_le_bom[] = {0xFF, 0xFE};
>>> -static const char utf32_be_bom[] = {0x00, 0x00, 0xFE, 0xFF};
>>> -static const char utf32_le_bom[] = {0xFF, 0xFE, 0x00, 0x00};
>>> +static const unsigned char utf16_be_bom[] = {0xFE, 0xFF};
>>> +static const unsigned char utf16_le_bom[] = {0xFF, 0xFE};
>>> +static const unsigned char utf32_be_bom[] = {0x00, 0x00, 0xFE, 0xFF};
>>> +static const unsigned char utf32_le_bom[] = {0xFF, 0xFE, 0x00, 0x00};
>>
>> An alternative approach that might be easier to read (and avoids the
>> confusion arising from our use of (signed) chars for strings pretty
>> much
>> everywhere):
>>
>> #define FE ((char)0xfe)
>> #define FF ((char)0xff)
>>
>> ...
>
> I have tried this first (without the macros, though), and thought
> it looked really ugly. That's why I chose this solution. The usage
> is pretty local and close to function has_bom_prefix().

I found that what you posted was already OK, as has_bom_prefix()
appears only locally in this file and that is the only thing that
cares about these foo_bom[] constants.  Casting the elements in
these arrays to (char) type is also fine and not all that ugly,
I think, and between the two (but without the macro) I have no
strong preference.  I wonder if writing them as '\376' and '\377'
as old timers would helps the compiler, though.


  parent reply	other threads:[~2018-07-09 16:33 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-08 14:43 [RFC PATCH 0/6] Compile cleanly in pedantic mode Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 1/6] connect.h: avoid forward declaration of an enum Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 2/6] refs/refs-internal.h: " Beat Bolli
2018-07-09 18:46   ` Jeff King
2018-07-09 19:30     ` Beat Bolli
2018-07-10  2:15       ` Jeff King
2018-07-08 14:43 ` [RFC PATCH 3/6] convert.c: replace "\e" escapes with "\033" Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 4/6] sequencer.c: avoid empty statements at top level Beat Bolli
2018-07-08 20:54   ` Eric Sunshine
2018-07-08 21:17     ` Philip Oakley
2018-07-09  9:37       ` ig
2018-07-09 21:34   ` Junio C Hamano
2018-07-09 21:37     ` Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 5/6] string-list.c: avoid conversion from void * to function pointer Beat Bolli
2018-07-08 14:43 ` [RFC PATCH 6/6] utf8.c: avoid char overflow Beat Bolli
2018-07-09 13:14   ` Johannes Schindelin
2018-07-09 14:48     ` Beat Bolli
2018-07-09 15:45       ` Beat Bolli
2018-07-09 16:33       ` Junio C Hamano [this message]
2018-07-09 17:56         ` Beat Bolli
2018-07-09 18:18         ` Junio C Hamano
2018-07-09 20:04       ` Johannes Schindelin
2018-07-09 13:40 ` [RFC PATCH 0/6] Compile cleanly in pedantic mode Johannes Schindelin
2018-07-09 16:25 ` Junio C Hamano
2018-07-09 19:25 ` [PATCH " Beat Bolli
2018-07-09 20:25   ` Beat Bolli
2018-07-09 21:45   ` Junio C Hamano
2018-07-09 21:47     ` Beat Bolli
2018-07-10  7:34     ` Beat Bolli
2018-07-11 15:42       ` Junio C Hamano
2018-07-12 13:25         ` Johannes Schindelin
2018-07-12 15:40           ` Junio C Hamano
2018-07-09 19:25 ` [PATCH 1/6] connect.h: avoid forward declaration of an enum Beat Bolli
2018-07-09 19:25 ` [PATCH 2/6] refs/refs-internal.h: " Beat Bolli
2018-07-09 19:25 ` [PATCH 3/6] convert.c: replace "\e" escapes with "\033" Beat Bolli
2018-07-09 19:25 ` [PATCH 4/6] sequencer.c: avoid empty statements at top level Beat Bolli
2018-07-09 21:37   ` Junio C Hamano
2018-07-09 19:25 ` [PATCH 5/6] string-list.c: avoid conversion from void * to function pointer Beat Bolli
2018-07-09 19:25 ` [PATCH 6/6] utf8.c: avoid char overflow Beat Bolli

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