From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: Han-Wen Nienhuys <hanwen@google.com>
Cc: Junio C Hamano <gitster@pobox.com>,
Han-Wen Nienhuys via GitGitGadget <gitgitgadget@gmail.com>,
git@vger.kernel.org, Bagas Sanjaya <bagasdotme@gmail.com>,
Elijah Newren <newren@gmail.com>,
Han-Wen Nienhuys <hanwenn@gmail.com>
Subject: Re: [PATCH v2 5/5] refs/debug: trim trailing LF from reflog message
Date: Mon, 29 Nov 2021 21:59:52 +0100 [thread overview]
Message-ID: <211129.86v90aekug.gmgdl@evledraar.gmail.com> (raw)
In-Reply-To: <CAFQ2z_N20ESyzkPLdGbS9q8HEHGB7_gmaX8FUBR=jGqXLGcL1Q@mail.gmail.com>
On Mon, Nov 29 2021, Han-Wen Nienhuys wrote:
> On Fri, Nov 26, 2021 at 9:16 AM Junio C Hamano <gitster@pobox.com> wrote:
>>
>> The API promises to have only LF, not CRLF, at the end, so
>> strbuf_trim_trailing_newline() is a bit overkill (and if payload
>> happened to end with CR, we would lose it).
>
> it would be best if there was a way to escape characters (ie. "\n" =>
> "\\n"). Do we have a function for that?
>
>> > + trace_printf_key(&trace_refs,
>> > + "reflog_ent %s (ret %d): %s -> %s, %s %ld \"%s\"\n",
>> > + dbg->refname, ret, o, n, committer,
>> > + (long int)timestamp, trimmed.buf);
>> > + strbuf_release(&trimmed);
>> > return ret;
>> > }
>>
>> Can we use counted bytes in trace_printf()? If we can, it would be
>> simpler to just scan "msg" for LF and then show only the span
>> between the beginning of the string and the found LF using "%.*s",
>> perhaps like this?
>
> I beg to differ - despite this being fewer lines of code, I think
> pointer arithmetic is best avoided if possible.
We usually do this with pointer arithmetic, but the %.*s format doesn't
require that, just code like:
const char *str = "foobar";
size_t len = strlen(str);
len -= 1; /* give me less! */
printf("%.*s", (int)len, str);
So you can also feed it (len - 1) or whatever if you know it to end with
a character you don't want.
It's (more simply done as) pointer arithmetic if you're finding that end
marker with strstr() or whatever, but you can also bend over backwards
and get a "len" instead through other means, and in either case I think
it beats reallocating the whole thing (more for readability than any
optimization reasons).
next prev parent reply other threads:[~2021-11-29 22:49 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-22 14:20 [PATCH 0/4] Inspect reflog data programmatically in more tests Han-Wen Nienhuys via GitGitGadget
2021-11-22 14:20 ` [PATCH 1/4] show-branch: show reflog message Han-Wen Nienhuys via GitGitGadget
2021-11-22 22:22 ` Junio C Hamano
2021-11-23 7:40 ` Bagas Sanjaya
2021-11-23 8:03 ` Elijah Newren
2021-11-22 14:20 ` [PATCH 2/4] refs: trim newline from " Han-Wen Nienhuys via GitGitGadget
2021-11-22 22:27 ` Junio C Hamano
2021-11-23 16:35 ` Han-Wen Nienhuys
2021-11-23 17:09 ` Junio C Hamano
2021-11-23 17:28 ` Han-Wen Nienhuys
2021-11-23 20:34 ` Junio C Hamano
2021-11-24 11:17 ` Han-Wen Nienhuys
2021-11-24 18:53 ` Junio C Hamano
2021-11-24 19:06 ` Han-Wen Nienhuys
2021-11-24 20:55 ` Junio C Hamano
2021-11-25 16:00 ` Han-Wen Nienhuys
2021-11-29 2:30 ` Junio C Hamano
2021-11-24 19:26 ` Junio C Hamano
2021-11-24 19:39 ` Han-Wen Nienhuys
2021-11-26 8:35 ` Re* " Junio C Hamano
2021-11-28 17:50 ` Ævar Arnfjörð Bjarmason
2021-11-28 18:59 ` Junio C Hamano
2021-11-28 19:25 ` Junio C Hamano
2021-11-29 8:39 ` Ævar Arnfjörð Bjarmason
2021-11-23 10:24 ` Ævar Arnfjörð Bjarmason
2021-11-23 16:44 ` Han-Wen Nienhuys
2021-11-22 14:20 ` [PATCH 3/4] test-ref-store: tweaks to for-each-reflog-ent format Han-Wen Nienhuys via GitGitGadget
2021-11-22 22:31 ` Junio C Hamano
2021-11-23 17:06 ` Han-Wen Nienhuys
2021-11-23 18:31 ` Junio C Hamano
2021-11-22 14:20 ` [PATCH 4/4] t1400: use test-helper ref-store to inspect reflog contents Han-Wen Nienhuys via GitGitGadget
2021-11-22 15:20 ` Ævar Arnfjörð Bjarmason
2021-11-22 17:07 ` Han-Wen Nienhuys
2021-11-22 22:22 ` Junio C Hamano
2021-11-25 15:57 ` [PATCH v2 0/5] Inspect reflog data programmatically in more tests Han-Wen Nienhuys via GitGitGadget
2021-11-25 15:57 ` [PATCH v2 1/5] show-branch: show reflog message Han-Wen Nienhuys via GitGitGadget
2021-11-25 15:57 ` [PATCH v2 2/5] test-ref-store: don't add newline to " Han-Wen Nienhuys via GitGitGadget
2021-11-26 7:56 ` Junio C Hamano
2021-11-25 15:57 ` [PATCH v2 3/5] t1405: check for_each_reflog_ent_reverse() more thoroughly Han-Wen Nienhuys via GitGitGadget
2021-11-25 15:57 ` [PATCH v2 4/5] test-ref-store: tweaks to for-each-reflog-ent format Han-Wen Nienhuys via GitGitGadget
2021-11-26 8:02 ` Junio C Hamano
2021-11-25 15:57 ` [PATCH v2 5/5] refs/debug: trim trailing LF from reflog message Han-Wen Nienhuys via GitGitGadget
2021-11-26 8:16 ` Junio C Hamano
2021-11-29 18:29 ` Han-Wen Nienhuys
2021-11-29 19:19 ` Junio C Hamano
2021-11-29 19:35 ` Junio C Hamano
2021-12-02 16:24 ` Han-Wen Nienhuys
2021-12-02 18:36 ` Junio C Hamano
2021-11-29 20:59 ` Ævar Arnfjörð Bjarmason [this message]
2021-11-29 9:50 ` [PATCH v2 0/5] Inspect reflog data programmatically in more tests Ævar Arnfjörð Bjarmason
2021-11-29 18:24 ` Han-Wen Nienhuys
2021-11-29 22:30 ` Junio C Hamano
2021-11-29 23:28 ` Ævar Arnfjörð Bjarmason
2021-12-02 16:11 ` Han-Wen Nienhuys
2021-12-02 17:36 ` [PATCH v3 " Han-Wen Nienhuys via GitGitGadget
2021-12-02 17:36 ` [PATCH v3 1/5] show-branch: show reflog message Han-Wen Nienhuys via GitGitGadget
2021-12-02 17:36 ` [PATCH v3 2/5] test-ref-store: don't add newline to " Han-Wen Nienhuys via GitGitGadget
2021-12-02 17:36 ` [PATCH v3 3/5] t1405: check for_each_reflog_ent_reverse() more thoroughly Han-Wen Nienhuys via GitGitGadget
2021-12-02 17:36 ` [PATCH v3 4/5] test-ref-store: tweaks to for-each-reflog-ent format Han-Wen Nienhuys via GitGitGadget
2021-12-02 17:36 ` [PATCH v3 5/5] refs/debug: trim trailing LF from reflog message Han-Wen Nienhuys via GitGitGadget
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