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From: Junio C Hamano <gitster@pobox.com>
To: Rohit Ashiwal <rohit.ashiwal265@gmail.com>
Cc: Johannes.Schindelin@gmx.de, git@vger.kernel.org,
	martin.agren@gmail.com, newren@gmail.com,
	phillip.wood123@gmail.com, t.gummerer@gmail.com
Subject: Re: [PATCH v3 2/6] sequencer: add NULL checks under read_author_script
Date: Fri, 23 Aug 2019 08:20:29 -0700	[thread overview]
Message-ID: <xmqqsgprnc1u.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <20190820034536.13071-3-rohit.ashiwal265@gmail.com> (Rohit Ashiwal's message of "Tue, 20 Aug 2019 09:15:31 +0530")

Rohit Ashiwal <rohit.ashiwal265@gmail.com> writes:

> read_author_script reads name, email and author date from the author
> script. However, it does not check if the arguments are NULL. Adding
> NULL checks will allow us to selectively get the required value,...

I had a hard time understanding the argument here without knowing
why I had trouble, and I think I figured it out.  What you wrote may
not be incorrect per-se, but the logic is backwards.

The function has been about reading all three, and it always took
and required the callers to pass three valid pointers to locations
to store these three.  It did not check for NULL; passing NULL was
simply a bug in the caller who deserved a segfault.

This series, however, wants to allow new callers of the function to
selectively read some among the three and ignore the rest, and you
happened to choose "pass NULL for an uninteresting field" as the
new calling convention.

That choice is where "checking for NULL" comes in.

In other words, "checking for NULL" is merely an implementation
detail for a more important change this patch brings in: We now
can read some and ignore the rest, while requiring that the input
file is well formed even for the fields we do not care about.



    sequencer: allow callers of read_author_script() to ignore fields

    The current callers of the read_author_script() function read
    name, email and date from the author script.  Allow callers to
    signal that they are not interested in some among these three
    fields by passing NULL.

    Note that fields that are ignored still must exist and be
    formatted correctly in the author script.

or something like that, perhaps.


  reply	other threads:[~2019-08-23 15:20 UTC|newest]

Thread overview: 96+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-06 17:36 [GSoC][PATCHl 0/6] rebase -i: support more options Rohit Ashiwal
2019-08-06 17:36 ` [GSoC][PATCHl 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-08-07  5:38   ` Junio C Hamano
2019-08-07 20:25     ` Rohit Ashiwal
2019-08-08 16:44   ` Phillip Wood
2019-08-12 17:43     ` Rohit Ashiwal
2019-08-06 17:36 ` [GSoC][PATCHl 2/6] sequencer: add NULL checks under read_author_script Rohit Ashiwal
2019-08-06 17:36 ` [GSoC][PATCHl 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-08-08 11:29   ` Phillip Wood
2019-08-08 16:00     ` Junio C Hamano
2019-08-06 17:36 ` [GSoC][PATCHl 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-08-08 11:30   ` Phillip Wood
2019-08-06 17:36 ` [GSoC][PATCHl 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-08-07 19:41   ` Johannes Schindelin
2019-08-07 20:22     ` Junio C Hamano
2019-08-07 20:33       ` Rohit Ashiwal
2019-08-08 11:42   ` Phillip Wood
2019-08-08 16:53     ` Phillip Wood
2019-08-06 17:36 ` [GSoC][PATCHl 6/6] rebase: add --author-date-is-committer-date Rohit Ashiwal
2019-08-08 11:42   ` Phillip Wood
2019-08-12 19:42 ` [GSoC][PATCH v2 0/6] rebase -i: support more options Rohit Ashiwal
2019-08-12 19:42   ` [GSoC][PATCH v2 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-08-13 12:07     ` Phillip Wood
2019-08-12 19:42   ` [GSoC][PATCH v2 2/6] sequencer: add NULL checks under read_author_script Rohit Ashiwal
2019-08-12 19:42   ` [GSoC][PATCH v2 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-08-13 10:38     ` Phillip Wood
2019-08-13 12:09       ` Phillip Wood
2019-08-13 17:06       ` Junio C Hamano
2019-08-14 18:38         ` Phillip Wood
2019-08-13 13:35     ` Phillip Wood
2019-08-12 19:42   ` [GSoC][PATCH v2 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-08-13 13:29     ` Phillip Wood
2019-08-12 19:42   ` [GSoC][PATCH v2 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-08-13 13:28     ` Phillip Wood
2019-08-13 17:21       ` Junio C Hamano
2019-08-14 18:47         ` Phillip Wood
2019-08-13 21:45     ` Junio C Hamano
2019-08-14 18:51       ` Phillip Wood
2019-08-14 19:33         ` Junio C Hamano
2019-08-17  9:28           ` Phillip Wood
2019-08-12 19:43   ` [GSoC][PATCH v2 6/6] rebase: add --author-date-is-committer-date Rohit Ashiwal
2019-08-13 17:28     ` Junio C Hamano
2019-08-20  3:45 ` [PATCH v3 0/6] rebase -i: support more options Rohit Ashiwal
2019-08-20  3:45   ` [PATCH v3 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-08-20 18:40     ` Phillip Wood
2019-08-20 18:47       ` Rohit Ashiwal
2019-08-20  3:45   ` [PATCH v3 2/6] sequencer: add NULL checks under read_author_script Rohit Ashiwal
2019-08-23 15:20     ` Junio C Hamano [this message]
2019-08-20  3:45   ` [PATCH v3 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-08-20 13:32     ` Phillip Wood
2019-08-20  3:45   ` [PATCH v3 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-08-20  3:45   ` [PATCH v3 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-08-20 13:45     ` Phillip Wood
2019-08-20 17:42     ` Junio C Hamano
2019-08-20 18:30       ` Phillip Wood
2019-08-20  3:45   ` [GSoC][PATCH v2 6/6] rebase: add --author-date-is-committer-date Rohit Ashiwal
2019-08-20  4:00     ` Rohit Ashiwal
2019-08-20  3:45   ` [PATCH v3 6/6] rebase: add --reset-author-date Rohit Ashiwal
2019-08-20  3:54   ` [PATCH v3 0/6] rebase -i: support more options Rohit Ashiwal
2019-08-20 13:56   ` Phillip Wood
2019-08-20 17:53     ` Junio C Hamano
2019-08-20 18:37       ` Phillip Wood
2019-09-07 11:50 ` [PATCH v4 " Rohit Ashiwal
2019-09-07 11:50   ` [PATCH v4 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-10-04  9:29     ` Phillip Wood
2019-10-05 18:12       ` Elijah Newren
2019-10-06 17:57       ` Rohit Ashiwal
2019-09-07 11:50   ` [PATCH v4 2/6] sequencer: allow callers of read_author_script() to ignore fields Rohit Ashiwal
2019-09-07 11:50   ` [PATCH v4 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-10-04  9:37     ` Phillip Wood
2019-10-06 17:57       ` Rohit Ashiwal
2019-10-24 13:28     ` Phillip Wood
2019-09-07 11:50   ` [PATCH v4 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-09-07 11:50   ` [PATCH v4 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-09-07 20:56     ` Rohit Ashiwal
2019-09-27 10:00     ` Phillip Wood
2019-10-06 17:57       ` Rohit Ashiwal
2019-10-24 20:36         ` Phillip Wood
2019-09-07 11:50   ` [PATCH v4 6/6] rebase: add --reset-author-date Rohit Ashiwal
2019-09-09 18:02   ` [PATCH v4 0/6] rebase -i: support more options Junio C Hamano
2019-09-09 18:51     ` Phillip Wood
2019-09-09 19:24       ` Junio C Hamano
2019-11-01 13:59 ` [PATCH v5 " Rohit Ashiwal
2019-11-01 13:59   ` [PATCH v5 1/6] rebase -i: add --ignore-whitespace flag Rohit Ashiwal
2019-11-01 13:59   ` [PATCH v5 2/6] sequencer: allow callers of read_author_script() to ignore fields Rohit Ashiwal
2019-11-01 14:00   ` [PATCH v5 3/6] rebase -i: support --committer-date-is-author-date Rohit Ashiwal
2019-11-01 14:00   ` [PATCH v5 4/6] sequencer: rename amend_author to author_to_rename Rohit Ashiwal
2019-11-01 14:00   ` [PATCH v5 5/6] rebase -i: support --ignore-date Rohit Ashiwal
2019-11-02  7:32     ` Junio C Hamano
2019-11-02  7:48       ` Junio C Hamano
2019-11-01 14:00   ` [PATCH v5 6/6] rebase: add --reset-author-date Rohit Ashiwal
2019-11-02  7:34     ` Junio C Hamano
2019-11-21  6:14   ` [PATCH v5 0/6] rebase -i: support more options Junio C Hamano
2019-11-21  8:17     ` Alban Gruin
2019-11-22  6:32       ` Junio C Hamano
2019-11-28 11:14   ` Phillip Wood

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