From: Ramkumar Ramachandra <artagnon@gmail.com>
To: Jonathan Nieder <jrnieder@gmail.com>
Cc: Git List <git@vger.kernel.org>,
Junio C Hamano <gitster@pobox.com>,
Christian Couder <chriscool@tuxfamily.org>,
Daniel Barkalow <barkalow@iabervon.org>
Subject: Re: [PATCH 02/17] revert: Inline add_message_to_msg function
Date: Wed, 13 Jul 2011 11:30:40 +0530 [thread overview]
Message-ID: <CALkWK0kHutr41aH7OrmW3REV+YBUeHSryA9n62yxyF0qRd1FEw@mail.gmail.com> (raw)
In-Reply-To: <20110712165302.GA13578@elie>
Hi Jonathan,
Jonathan Nieder writes:
> Ramkumar Ramachandra wrote:
>
>> The add_message_to_msg function is poorly implemented, has an unclear
>> API, and only one callsite. Replace the callsite with a cleaner
>> implementation. Additionally, fix a bug introduced in 9509af6 (Make
>> git-revert & git-cherry-pick a builtin, 2007-03-01) -- a NULL pointer
>> was being incremented when "\n\n" was not found in "message".
>
> Rather than being an optimization, the main impact of this change is
> to avoid a NULL pointer dereference in some cases, right?
>
> If so, the subject line should say so. Is it possible to reproduce
> this? Could we add a test to avoid regressing in the future?
>
> Less importantly:
>
>> --- a/builtin/revert.c
>> +++ b/builtin/revert.c
> [...]
>> @@ -462,11 +449,16 @@ static int do_pick_commit(void)
>> }
>> strbuf_addstr(&msgbuf, ".\n");
>> } else {
>> + const char *p = strstr(msg.message, "\n\n");
>> +
>> base = parent;
>> base_label = msg.parent_label;
>> next = commit;
>> next_label = msg.label;
>> - add_message_to_msg(&msgbuf, msg.message);
>> +
>> + p = p ? p + 2 : sha1_to_hex(commit->object.sha1);
>> + strbuf_addstr(&msgbuf, p);
>
> I think this would be clearer like so:
>
> const char *p;
> ...
> p = strstr(...);
> if (p)
> p += 2;
> else
> p = sha1_to_hex...
> strbuf_addstr(&msgbuf, p);
>
> i.e., putting all the code that manipulates p together. Besides,
> pre-C99 compilers don't like "p" to be initialized to a non-constant.
> :)
>
> At [1], I also see a suggestion of a comment that could clarify the
> code a little.
Fixed all issues. The commit message now reads
revert: Inline add_message_to_msg function
The add_message_to_msg function is poorly implemented, has an unclear
API, and only one callsite. Replace the callsite with a cleaner
implementation. Additionally, fix a bug introduced in 9509af6 (Make
git-revert & git-cherry-pick a builtin, 2007-03-01) -- a NULL pointer
was being dereferenced when "\n\n" was not found in "message".
Thanks.
-- Ram
next prev parent reply other threads:[~2011-07-13 6:02 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-11 14:53 [GSoC update] Sequencer for inclusion Ramkumar Ramachandra
2011-07-11 14:53 ` [PATCH 01/17] advice: Introduce error_resolve_conflict Ramkumar Ramachandra
2011-07-11 14:53 ` [PATCH 02/17] revert: Inline add_message_to_msg function Ramkumar Ramachandra
2011-07-12 16:53 ` Jonathan Nieder
2011-07-13 6:00 ` Ramkumar Ramachandra [this message]
2011-07-13 6:42 ` Jonathan Nieder
2011-07-19 16:36 ` Ramkumar Ramachandra
2011-07-19 16:52 ` Junio C Hamano
2011-07-19 17:08 ` Ramkumar Ramachandra
2011-07-19 19:36 ` Jonathan Nieder
2011-07-20 5:32 ` Ramkumar Ramachandra
2011-07-11 14:53 ` [PATCH 03/17] revert: Don't check lone argument in get_encoding Ramkumar Ramachandra
2011-07-12 16:59 ` Jonathan Nieder
2011-07-13 6:14 ` Ramkumar Ramachandra
2011-07-13 6:30 ` Jonathan Nieder
2011-07-11 14:53 ` [PATCH 04/17] revert: Rename no_replay to record_origin Ramkumar Ramachandra
2011-07-12 17:02 ` Jonathan Nieder
2011-07-13 7:35 ` Ramkumar Ramachandra
2011-07-17 19:36 ` Jonathan Nieder
2011-07-11 14:53 ` [PATCH 05/17] revert: Propogate errors upwards from do_pick_commit Ramkumar Ramachandra
2011-07-12 17:32 ` Jonathan Nieder
2011-07-17 10:46 ` Ramkumar Ramachandra
2011-07-17 16:59 ` Jonathan Nieder
2011-07-19 10:09 ` Ramkumar Ramachandra
2011-07-11 14:53 ` [PATCH 06/17] revert: Eliminate global "commit" variable Ramkumar Ramachandra
2011-07-12 17:45 ` Jonathan Nieder
2011-07-13 6:57 ` Ramkumar Ramachandra
2011-07-13 7:10 ` Jonathan Nieder
2011-07-13 8:33 ` Ramkumar Ramachandra
2011-07-13 16:40 ` Jonathan Nieder
2011-07-11 14:53 ` [PATCH 07/17] revert: Introduce struct to keep command-line options Ramkumar Ramachandra
2011-07-12 18:05 ` Jonathan Nieder
2011-07-13 7:56 ` Ramkumar Ramachandra
2011-07-11 14:53 ` [PATCH 08/17] revert: Separate cmdline parsing from functional code Ramkumar Ramachandra
2011-07-12 18:20 ` Jonathan Nieder
2011-07-18 20:53 ` Ramkumar Ramachandra
2011-07-18 21:03 ` Jonathan Nieder
2011-07-11 14:54 ` [PATCH 09/17] revert: Don't create invalid replay_opts in parse_args Ramkumar Ramachandra
2011-07-11 20:44 ` Junio C Hamano
2011-07-12 5:57 ` Ramkumar Ramachandra
2011-07-12 18:29 ` Jonathan Nieder
2011-07-17 11:56 ` Ramkumar Ramachandra
2011-07-17 18:43 ` Jonathan Nieder
2011-07-11 14:54 ` [PATCH 10/17] sequencer: Announce sequencer state location Ramkumar Ramachandra
2011-07-12 18:56 ` Jonathan Nieder
2011-07-13 12:10 ` Sverre Rabbelier
2011-07-17 16:23 ` Ramkumar Ramachandra
2011-07-17 19:19 ` Jonathan Nieder
2011-07-18 19:44 ` Ramkumar Ramachandra
2011-07-11 14:54 ` [PATCH 11/17] revert: Save data for continuing after conflict resolution Ramkumar Ramachandra
2011-07-11 21:01 ` Junio C Hamano
2011-07-11 21:31 ` Junio C Hamano
2011-07-12 5:43 ` Ramkumar Ramachandra
2011-07-12 19:37 ` Jonathan Nieder
2011-07-17 11:48 ` Ramkumar Ramachandra
2011-07-17 18:40 ` Jonathan Nieder
2011-07-18 19:31 ` Ramkumar Ramachandra
2011-07-19 12:21 ` Jonathan Nieder
2011-07-19 12:34 ` Ramkumar Ramachandra
2011-07-11 14:54 ` [PATCH 12/17] revert: Save command-line options for continuing operation Ramkumar Ramachandra
2011-07-11 21:15 ` Junio C Hamano
2011-07-12 5:56 ` Ramkumar Ramachandra
2011-07-12 19:52 ` Jonathan Nieder
2011-07-18 20:18 ` Ramkumar Ramachandra
2011-07-11 14:54 ` [PATCH 13/17] revert: Introduce a layer of indirection over pick_commits Ramkumar Ramachandra
2011-07-12 20:03 ` Jonathan Nieder
2011-07-18 21:24 ` Ramkumar Ramachandra
2011-07-11 14:54 ` [PATCH 14/17] reset: Make hard reset remove the sequencer state Ramkumar Ramachandra
2011-07-12 20:15 ` Jonathan Nieder
2011-07-17 16:40 ` Ramkumar Ramachandra
2011-07-11 14:54 ` [PATCH 15/17] revert: Remove sequencer state when no commits are pending Ramkumar Ramachandra
2011-07-11 19:58 ` Junio C Hamano
2011-07-12 6:26 ` Ramkumar Ramachandra
2011-07-11 14:54 ` [PATCH 16/17] revert: Introduce --reset to remove sequencer state Ramkumar Ramachandra
2011-07-12 20:30 ` Jonathan Nieder
2011-07-17 17:10 ` Ramkumar Ramachandra
2011-07-17 19:25 ` Jonathan Nieder
2011-07-11 14:54 ` [PATCH 17/17] revert: Introduce --continue to continue the operation Ramkumar Ramachandra
2011-07-12 20:46 ` Jonathan Nieder
2011-07-17 16:11 ` Ramkumar Ramachandra
2011-07-17 18:32 ` Jonathan Nieder
2011-07-18 20:00 ` Ramkumar Ramachandra
2011-07-18 20:09 ` Jonathan Nieder
2011-07-11 17:17 ` [GSoC update] Sequencer for inclusion Jonathan Nieder
2011-07-11 17:57 ` Ramkumar Ramachandra
2011-07-11 20:05 ` Ramkumar Ramachandra
2011-07-11 20:11 ` Jonathan Nieder
2011-07-12 7:05 ` Ramkumar Ramachandra
2011-07-11 20:07 ` Junio C Hamano
2011-07-11 22:14 ` Jeff King
2011-07-12 6:41 ` Ramkumar Ramachandra
2011-07-12 6:47 ` Jeff King
2011-07-13 9:41 ` Ramkumar Ramachandra
2011-07-13 19:07 ` Jeff King
2011-07-18 21:37 ` [RFC PATCH] config: Introduce functions to write non-standard file Ramkumar Ramachandra
2011-07-18 23:54 ` Junio C Hamano
2011-07-19 8:52 ` Ramkumar Ramachandra
2011-07-12 5:58 ` [GSoC update] Sequencer for inclusion Jonathan Nieder
2011-07-12 6:28 ` Miles Bader
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