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From: Patrick Steinhardt <ps@pks.im>
To: Junio C Hamano <gitster@pobox.com>
Cc: git <git@vger.kernel.org>, Christian Couder <christian.couder@gmail.com>
Subject: Re: [PATCH 3/9] strbuf: provide function to append whole lines
Date: Mon, 30 Mar 2020 15:25:09 +0200
Message-ID: <20200330132509.GA1344694@ncase.pks.im> (raw)
In-Reply-To: <xmqqpncxfr1p.fsf@gitster.c.googlers.com>


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On Fri, Mar 27, 2020 at 02:04:18PM -0700, Junio C Hamano wrote:
> Patrick Steinhardt <ps@pks.im> writes:
> 
> > While the strbuf interface already provides functions to read a line
> > into it that completely replaces its current contents, we do not have an
> > interface that allows for appending lines without discarding current
> > contents.
> >
> > Add a new function `strbuf_appendwholeline` that reads a line including
> > its terminating character into a strbuf non-destructively. This is a
> > preparatory step for git-update-ref(1) reading standard input line-wise
> > instead of as a block.
> 
> Hmph.  If we were to gain more uses of this function over time, the
> necessity for an extra strbuf_addbuf() becomes annoying.  I wonder
> if we should be doing this patch the other way around, i.e. move the
> whole implementation, except for the early
> 
> 	if (feof(fp))
> 		return EOF;
> 	strbuf_reset(sb);
> 
> part, and call it strbuf_addwholeline(), and strbuf_getwholeline()
> becomes a thin wrapper around it that resets the incoming buffer
> before calling strbuf_addwholeline().  The logic to determine EOF
> would need to be updated if we go that route (i.e. instead of
> checking sb->len is zero in the !HAVE_GETDELIM side of the
> implementation, we need to see if the number is the same as before)
> but it should be minor.

Unfortunately it's not that easy for the HAVE_GETDELIM case, though, as
we cannot call getdelim(3P) to append to an already populated buffer. So
we'd have to call getdelim(3P) either on a NULL line and append manually
or on an empty line in case the strbuf doesn't have any contents. While
doable, I wanted to keep out this additional complexity for now.

Patrick

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  reply index

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-25  9:53 [PATCH 0/9] Support for transactions in `git-update-ref --stdin` Patrick Steinhardt
2020-03-25  9:53 ` [PATCH 1/9] refs: fix segfault when aborting empty transaction Patrick Steinhardt
2020-03-27 19:59   ` Junio C Hamano
2020-03-25  9:53 ` [PATCH 2/9] git-update-ref.txt: add missing word Patrick Steinhardt
2020-03-25  9:53 ` [PATCH 3/9] strbuf: provide function to append whole lines Patrick Steinhardt
2020-03-27 21:04   ` Junio C Hamano
2020-03-30 13:25     ` Patrick Steinhardt [this message]
2020-03-30 17:12       ` Junio C Hamano
2020-03-25  9:53 ` [PATCH 4/9] update-ref: organize commands in an array Patrick Steinhardt
2020-03-27 21:25   ` Junio C Hamano
2020-03-30  8:05     ` Patrick Steinhardt
2020-03-30 16:55       ` Junio C Hamano
2020-03-30 17:37         ` Patrick Steinhardt
2020-03-25  9:54 ` [PATCH 5/9] update-ref: drop unused argument for `parse_refname` Patrick Steinhardt
2020-03-25  9:54 ` [PATCH 6/9] update-ref: pass end pointer instead of strbuf Patrick Steinhardt
2020-03-25  9:54 ` [PATCH 7/9] update-ref: move transaction handling into `update_refs_stdin()` Patrick Steinhardt
2020-03-27 21:44   ` Junio C Hamano
2020-03-25  9:54 ` [PATCH 8/9] update-ref: read commands in a line-wise fashion Patrick Steinhardt
2020-03-27 21:58   ` Junio C Hamano
2020-03-30  8:11     ` Patrick Steinhardt
2020-03-30 17:39       ` Junio C Hamano
2020-03-25  9:54 ` [PATCH 9/9] update-ref: implement interactive transaction handling Patrick Steinhardt
2020-03-27 22:00   ` Junio C Hamano
2020-03-30 13:46 ` [PATCH v2 0/9] Support for transactions in `git-update-ref --stdin` Patrick Steinhardt
2020-03-30 13:46   ` [PATCH v2 1/9] refs: fix segfault when aborting empty transaction Patrick Steinhardt
2020-03-30 13:46   ` [PATCH v2 2/9] git-update-ref.txt: add missing word Patrick Steinhardt
2020-03-30 13:46   ` [PATCH v2 3/9] strbuf: provide function to append whole lines Patrick Steinhardt
2020-03-30 13:46   ` [PATCH v2 4/9] update-ref: organize commands in an array Patrick Steinhardt
2020-03-30 13:46   ` [PATCH v2 5/9] update-ref: drop unused argument for `parse_refname` Patrick Steinhardt
2020-03-30 13:46   ` [PATCH v2 6/9] update-ref: pass end pointer instead of strbuf Patrick Steinhardt
2020-03-30 13:46   ` [PATCH v2 7/9] update-ref: move transaction handling into `update_refs_stdin()` Patrick Steinhardt
2020-03-30 13:46   ` [PATCH v2 8/9] update-ref: read commands in a line-wise fashion Patrick Steinhardt
2020-03-30 13:47   ` [PATCH v2 9/9] update-ref: implement interactive transaction handling Patrick Steinhardt
2020-04-02  7:09 ` [PATCH v3 0/9] Support for transactions in `git-update-ref --stdin` Patrick Steinhardt
2020-04-02  7:09   ` [PATCH v3 1/9] refs: fix segfault when aborting empty transaction Patrick Steinhardt
2020-04-02  7:09   ` [PATCH v3 2/9] git-update-ref.txt: add missing word Patrick Steinhardt
2020-04-02  7:09   ` [PATCH v3 3/9] strbuf: provide function to append whole lines Patrick Steinhardt
2020-04-02  7:09   ` [PATCH v3 4/9] update-ref: organize commands in an array Patrick Steinhardt
2020-04-02  7:09   ` [PATCH v3 5/9] update-ref: drop unused argument for `parse_refname` Patrick Steinhardt
2020-04-02  7:09   ` [PATCH v3 6/9] update-ref: pass end pointer instead of strbuf Patrick Steinhardt
2020-04-02  7:09   ` [PATCH v3 7/9] update-ref: move transaction handling into `update_refs_stdin()` Patrick Steinhardt
2020-04-02  7:09   ` [PATCH v3 8/9] update-ref: read commands in a line-wise fashion Patrick Steinhardt
2020-04-02  7:10   ` [PATCH v3 9/9] update-ref: implement interactive transaction handling Patrick Steinhardt
2020-04-03 13:40     ` Phillip Wood
2020-04-03 16:51       ` Patrick Steinhardt
2020-04-03 17:33       ` Junio C Hamano
2020-04-03 17:35         ` Junio C Hamano
2020-04-06  7:10         ` Patrick Steinhardt

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