From: Martin von Zweigbergk <martinvonz@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: git <git@vger.kernel.org>
Subject: Re: [PATCH 06/19] reset.c: remove unnecessary variable 'i'
Date: Thu, 10 Jan 2013 00:41:49 -0800 [thread overview]
Message-ID: <CANiSa6jJcYRUyswSktq86pWttxBjZedZcPheRgPCf+EubC_kLg@mail.gmail.com> (raw)
In-Reply-To: <7vpq1e5ent.fsf@alter.siamese.dyndns.org>
On Wed, Jan 9, 2013 at 11:39 AM, Junio C Hamano <gitster@pobox.com> wrote:
> Martin von Zweigbergk <martinvonz@gmail.com> writes:
>
>> Throughout most of parse_args(), the variable 'i' remains at 0. In the
>> remaining few cases, we can do pointer arithmentic on argv itself
>> instead.
>> ---
>> This is clearly mostly a matter of taste. The remainder of the series
>> does not depend on it in any way.
>
> I agree that it indeed is a matter of taste between
>
> (1) look at av[i], check with (i < ac) for the end, and increment i to
> iterate over the arguments; and
>
> (2) look at av[0], check with (0 < ac) for the end, and increment
> av and decrement ac at the same time to iterate over the
> arguments.
>
> When (ac, av) appear as a pair, however, adjusting only av without
> adjusting ac is asking for future trouble. It violates a common
> expectation that av[ac] points at the NULL at the end of the list.
Good points.
> If a code chooses to use !av[0] as the terminating condition and
> never looks at ac, then incrementing only av is fine, but in such a
> case, the function probably should lose ac altogether.
Makes sense. I've picked this style for now (i.e. dropped both 'i' and
'argc'). I was surprised by the style that referred to the variable in
many places where it was know to be 0, but I'm no experienced C
programmer, so if that's a common practice when it comes to argument
parsing, I'm also happy to drop the patch. Let me know what you
prefer.
next prev parent reply other threads:[~2013-01-10 8:42 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-09 8:15 [PATCH 00/19] reset improvements Martin von Zweigbergk
2013-01-09 8:15 ` [PATCH 01/19] reset $pathspec: no need to discard index Martin von Zweigbergk
2013-01-09 8:15 ` [PATCH 02/19] reset $pathspec: exit with code 0 if successful Martin von Zweigbergk
2013-01-09 8:16 ` [PATCH 03/19] reset.c: pass pathspec around instead of (prefix, argv) pair Martin von Zweigbergk
2013-01-09 11:42 ` Matt Kraai
2013-01-09 19:26 ` Junio C Hamano
2013-01-10 11:05 ` Duy Nguyen
2013-01-10 23:09 ` Junio C Hamano
2013-01-11 11:10 ` Duy Nguyen
2013-01-09 8:16 ` [PATCH 04/19] reset: don't allow "git reset -- $pathspec" in bare repo Martin von Zweigbergk
2013-01-09 19:32 ` Junio C Hamano
2013-01-10 8:24 ` Martin von Zweigbergk
2013-01-10 18:04 ` Junio C Hamano
2013-01-09 8:16 ` [PATCH 05/19] reset.c: extract function for parsing arguments Martin von Zweigbergk
2013-01-09 8:16 ` [PATCH 06/19] reset.c: remove unnecessary variable 'i' Martin von Zweigbergk
2013-01-09 19:39 ` Junio C Hamano
2013-01-10 8:41 ` Martin von Zweigbergk [this message]
2013-01-09 8:16 ` [PATCH 07/19] reset.c: extract function for updating {ORIG,}HEAD Martin von Zweigbergk
2013-01-09 11:54 ` Matt Kraai
2013-01-09 8:16 ` [PATCH 08/19] reset.c: share call to die_if_unmerged_cache() Martin von Zweigbergk
2013-01-09 19:48 ` Junio C Hamano
2013-01-10 8:51 ` Martin von Zweigbergk
2013-01-09 8:16 ` [PATCH 09/19] reset.c: replace switch by if-else Martin von Zweigbergk
2013-01-09 19:53 ` Junio C Hamano
2013-01-11 6:35 ` Martin von Zweigbergk
2013-01-11 17:12 ` Junio C Hamano
2013-01-09 8:16 ` [PATCH 10/19] reset --keep: only write index file once Martin von Zweigbergk
2013-01-09 19:55 ` Junio C Hamano
2013-01-09 8:16 ` [PATCH 11/19] reset: avoid redundant error message Martin von Zweigbergk
2013-01-09 8:16 ` [PATCH 12/19] reset.c: move update_index_refresh() call out of read_from_tree() Martin von Zweigbergk
2013-01-09 8:16 ` [PATCH 13/19] reset.c: move lock, write and commit out of update_index_refresh() Martin von Zweigbergk
2013-01-09 8:16 ` [PATCH 14/19] reset [--mixed]: don't write index file twice Martin von Zweigbergk
2013-01-09 8:16 ` [PATCH 15/19] reset.c: finish entire cmd_reset() whether or not pathspec is given Martin von Zweigbergk
2013-01-09 19:59 ` Junio C Hamano
2013-01-09 8:16 ` [PATCH 16/19] reset [--mixed] --quiet: don't refresh index Martin von Zweigbergk
2013-01-09 17:01 ` Jeff King
2013-01-09 18:43 ` Martin von Zweigbergk
2013-01-09 19:12 ` Junio C Hamano
2013-01-09 19:38 ` Martin von Zweigbergk
2013-01-09 20:05 ` Junio C Hamano
2013-01-09 8:16 ` [PATCH 17/19] reset $sha1 $pathspec: require $sha1 only to be treeish Martin von Zweigbergk
2013-01-09 20:23 ` Junio C Hamano
2013-01-09 8:16 ` [PATCH 18/19] reset: allow reset on unborn branch Martin von Zweigbergk
2013-01-09 8:16 ` [PATCH 19/19] reset [--mixed]: use diff-based reset whether or not pathspec was given Martin von Zweigbergk
2013-01-09 20:27 ` Junio C Hamano
2013-01-15 5:47 ` [PATCH v2 00/19] reset improvements Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 01/19] reset $pathspec: no need to discard index Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 02/19] reset $pathspec: exit with code 0 if successful Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 03/19] reset.c: pass pathspec around instead of (prefix, argv) pair Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 04/19] reset: don't allow "git reset -- $pathspec" in bare repo Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 05/19] reset.c: extract function for parsing arguments Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 06/19] reset.c: remove unnecessary variable 'i' Martin von Zweigbergk
[not found] ` <A5E8E180685CEF45AB9E737A010799805E00DD@cdnz-ex1.corp.cubic.cub>
2013-01-15 18:36 ` Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 07/19] reset.c: extract function for updating {ORIG_,}HEAD Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 08/19] reset.c: share call to die_if_unmerged_cache() Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 09/19] reset --keep: only write index file once Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 10/19] reset: avoid redundant error message Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 11/19] reset.c: replace switch by if-else Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 12/19] reset.c: move update_index_refresh() call out of read_from_tree() Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 13/19] reset.c: move lock, write and commit out of update_index_refresh() Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 14/19] reset [--mixed]: only write index file once Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 15/19] reset.c: finish entire cmd_reset() whether or not pathspec is given Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 16/19] reset.c: inline update_index_refresh() Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 17/19] reset $sha1 $pathspec: require $sha1 only to be treeish Martin von Zweigbergk
2013-01-16 18:00 ` [PATCH v2 17/19] fixup! " Martin von Zweigbergk
2013-01-16 18:08 ` Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 18/19] reset: allow reset on unborn branch Martin von Zweigbergk
2013-01-15 5:47 ` [PATCH v2 19/19] reset [--mixed]: use diff-based reset whether or not pathspec was given Martin von Zweigbergk
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