From: Danh Doan <congdanhqx@gmail.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org
Subject: Re: [PATCH v2 2/3] configure.ac: define ICONV_OMITS_BOM if necessary
Date: Sat, 2 Nov 2019 07:43:42 +0700 [thread overview]
Message-ID: <20191102004342.GA17624@danh.dev> (raw)
In-Reply-To: <20191101165657.GC26219@sigill.intra.peff.net>
On 2019-11-01 12:56:57 -0400, Jeff King wrote:
> On Fri, Nov 01, 2019 at 03:25:10PM +0700, Doan Tran Cong Danh wrote:
> > + v = (unsigned char)(out[0]) + (unsigned char)(out[1]);
> > + return v != 0xfe + 0xff;
>
> I wondered at first why not just:
>
> return v[0] != 0xfe || v[1] != 0xff;
>
> but the answer is that you are catching BOMs of either endianness. We
> might at some point need to distinguish the two,
Yes, it's about catching BOM of either endianess. To distinguish
between LE and BE, it'll be better to use AC_C_BIGENDIAN instead (it's
friendlier for cross-compiling).
Anyway, we couldn't compare out[0] and out[1] with 0xf{e,f} directly
because char could be either signed (-2 and -1) or unsigned (0xfe, 0xff).
We must cast it to unsigned char (required to be 8 bits by POSIX),
then let the integer promotion promote it to int (at least 16 bits).
--
Danh
next prev parent reply other threads:[~2019-11-02 0:43 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-31 9:26 [PATCH 0/3] Linux with musl libc improvement Doan Tran Cong Danh
2019-10-31 9:26 ` [PATCH 1/3] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-10-31 17:41 ` Jeff King
2019-11-01 1:33 ` Danh Doan
2019-10-31 19:50 ` brian m. carlson
2019-10-31 9:26 ` [PATCH 2/3] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-10-31 18:11 ` Jeff King
2019-10-31 20:02 ` brian m. carlson
2019-11-01 1:40 ` Danh Doan
2019-10-31 9:26 ` [PATCH 3/3] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-10-31 10:38 ` Johannes Schindelin
2019-10-31 19:26 ` Jeff King
2019-11-01 4:49 ` Danh Doan
2019-11-01 8:25 ` [PATCH v2 0/3] Linux with musl libc improvement Doan Tran Cong Danh
2019-11-01 8:25 ` [PATCH v2 1/3] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-01 16:54 ` Jeff King
2019-11-01 8:25 ` [PATCH v2 2/3] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-01 16:56 ` Jeff King
2019-11-02 0:43 ` Danh Doan [this message]
2019-11-01 8:25 ` [PATCH v2 3/3] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-01 16:59 ` Jeff King
2019-11-02 1:02 ` Danh Doan
2019-11-02 12:20 ` Danh Doan
2019-11-05 8:00 ` Jeff King
2019-11-06 1:30 ` Junio C Hamano
2019-11-06 4:03 ` Jeff King
2019-11-06 10:03 ` Danh Doan
2019-11-07 5:56 ` Jeff King
2019-11-06 9:19 ` [PATCH v3 0/8] Correct internal working and output encoding Doan Tran Cong Danh
2019-11-06 9:19 ` [PATCH v3 1/8] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-06 9:20 ` [PATCH v3 2/8] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-06 9:20 ` [PATCH v3 3/8] t3900: demonstrate git-rebase problem with multi encoding Doan Tran Cong Danh
2019-11-06 9:20 ` [PATCH v3 4/8] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-06 9:20 ` [PATCH v3 5/8] sequencer: reencode revert/cherry-pick's " Doan Tran Cong Danh
2019-11-06 9:20 ` [PATCH v3 6/8] sequencer: reencode squashing commit's message Doan Tran Cong Danh
2019-11-06 9:20 ` [PATCH v3 7/8] sequencer: reencode old merge-commit message Doan Tran Cong Danh
2019-11-06 15:39 ` Eric Sunshine
2019-11-06 9:20 ` [PATCH v3 8/8] sequencer: reencode commit message for am/rebase --show-current-patch Doan Tran Cong Danh
2019-11-07 2:56 ` [PATCH v4 0/8] Correct internal working and output encoding Doan Tran Cong Danh
2019-11-07 2:56 ` [PATCH v4 1/8] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-07 2:56 ` [PATCH v4 2/8] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-07 6:18 ` Junio C Hamano
2019-11-07 2:56 ` [PATCH v4 3/8] t3900: demonstrate git-rebase problem with multi encoding Doan Tran Cong Danh
2019-11-07 6:02 ` Jeff King
2019-11-07 6:48 ` Danh Doan
2019-11-07 8:02 ` Jeff King
2019-11-07 10:51 ` Danh Doan
2019-11-11 8:22 ` Jeff King
2019-11-07 2:56 ` [PATCH v4 4/8] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-07 6:04 ` Jeff King
2019-11-07 2:56 ` [PATCH v4 5/8] sequencer: reencode revert/cherry-pick's " Doan Tran Cong Danh
2019-11-07 6:06 ` Jeff King
2019-11-07 2:56 ` [PATCH v4 6/8] sequencer: reencode squashing commit's message Doan Tran Cong Danh
2019-11-07 6:15 ` Jeff King
2019-11-07 2:56 ` [PATCH v4 7/8] sequencer: reencode old merge-commit message Doan Tran Cong Danh
2019-11-07 2:56 ` [PATCH v4 8/8] sequencer: reencode commit message for am/rebase --show-current-patch Doan Tran Cong Danh
2019-11-07 6:32 ` Jeff King
2019-11-07 7:48 ` Danh Doan
2019-11-07 8:03 ` Jeff King
2019-11-07 16:32 ` Danh Doan
2019-11-08 9:43 ` [PATCH v5 0/9] Improve odd encoding integration Doan Tran Cong Danh
2019-11-08 9:43 ` [PATCH v5 1/9] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-08 9:43 ` [PATCH v5 2/9] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-08 9:43 ` [PATCH v5 3/9] t3900: demonstrate git-rebase problem with multi encoding Doan Tran Cong Danh
2019-11-08 9:43 ` [PATCH v5 4/9] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-08 9:43 ` [PATCH v5 5/9] sequencer: reencode revert/cherry-pick's " Doan Tran Cong Danh
2019-11-08 9:43 ` [PATCH v5 6/9] sequencer: reencode squashing commit's message Doan Tran Cong Danh
2019-11-08 9:43 ` [PATCH v5 7/9] sequencer: reencode old merge-commit message Doan Tran Cong Danh
2019-11-08 9:43 ` [PATCH v5 8/9] sequencer: reencode commit message for am/rebase --show-current-patch Doan Tran Cong Danh
2019-11-08 9:43 ` [PATCH v5 9/9] sequencer: fallback to sane label in making rebase todo list Doan Tran Cong Danh
2019-11-11 1:22 ` [PATCH v5 0/9] Improve odd encoding integration Junio C Hamano
2019-11-11 4:02 ` Junio C Hamano
2019-11-11 4:43 ` Danh Doan
2019-11-11 6:14 ` Junio C Hamano
2019-11-11 6:03 ` [PATCH v6 0/9] sequencer: handle other encoding better Doan Tran Cong Danh
2019-11-11 6:03 ` [PATCH v6 1/9] t0028: eliminate non-standard usage of printf Doan Tran Cong Danh
2019-11-11 6:03 ` [PATCH v6 2/9] configure.ac: define ICONV_OMITS_BOM if necessary Doan Tran Cong Danh
2019-11-11 6:03 ` [PATCH v6 3/9] t3900: demonstrate git-rebase problem with multi encoding Doan Tran Cong Danh
2019-11-11 6:03 ` [PATCH v6 4/9] sequencer: reencode to utf-8 before arrange rebase's todo list Doan Tran Cong Danh
2019-11-11 6:03 ` [PATCH v6 5/9] sequencer: reencode revert/cherry-pick's " Doan Tran Cong Danh
2019-11-11 6:03 ` [PATCH v6 6/9] sequencer: reencode squashing commit's message Doan Tran Cong Danh
2019-11-11 6:03 ` [PATCH v6 7/9] sequencer: reencode old merge-commit message Doan Tran Cong Danh
2019-11-11 6:03 ` [PATCH v6 8/9] sequencer: reencode commit message for am/rebase --show-current-patch Doan Tran Cong Danh
2019-11-11 6:03 ` [PATCH v6 9/9] sequencer: fallback to sane label in making rebase todo list Doan Tran Cong Danh
2019-11-11 8:39 ` Jeff King
2019-11-11 16:22 ` Phillip Wood
2019-11-11 18:26 ` Johannes Schindelin
2019-11-12 4:17 ` Junio C Hamano
2019-11-11 8:40 ` [PATCH v6 0/9] sequencer: handle other encoding better Jeff King
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