From: Taylor Blau <me@ttaylorr.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org, Chris Torek <chris.torek@gmail.com>,
Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v2 3/6] t/helper/test-hashmap.c: avoid using `strtok()`
Date: Mon, 24 Apr 2023 17:19:16 -0400 [thread overview]
Message-ID: <ZEbyVDWhSGAyKDJL@nand.local> (raw)
In-Reply-To: <20230422111657.GD2969939@coredump.intra.peff.net>
On Sat, Apr 22, 2023 at 07:16:57AM -0400, Jeff King wrote:
> On Tue, Apr 18, 2023 at 03:18:49PM -0400, Taylor Blau wrote:
>
> > @@ -159,21 +161,34 @@ int cmd__hashmap(int argc, const char **argv)
> >
> > /* process commands from stdin */
> > while (strbuf_getline(&line, stdin) != EOF) {
> > - char *cmd, *p1 = NULL, *p2 = NULL;
> > + char *cmd, *p1, *p2;
> > unsigned int hash = 0;
> > struct test_entry *entry;
> >
> > + /*
> > + * Because we memdup() the arguments out of the
> > + * string_list before inserting them into the hashmap,
> > + * it's OK to set its length back to zero to avoid
> > + * re-allocating the items array once per line.
> > + *
> > + * By doing so, we'll instead overwrite the existing
> > + * entries and avoid re-allocating.
> > + */
> > + string_list_setlen(&parts, 0);
> > /* break line into command and up to two parameters */
> > - cmd = strtok(line.buf, DELIM);
> > + string_list_split_in_place_multi(&parts, line.buf, DELIM, 2);
> > +
>
> I'd argue we can drop this comment now. Having string_list_setlen()
> makes it a blessed pattern, and I don't think there's anything special
> about this caller that makes it more or less so. Obviously yes, the
> string list items won't be valid as we enter a new loop iteration. But
> that is always true of split_in_place(), not to mention strtok(),
> because we are overwriting the buffer in each loop.
Agreed, I think that part of the point of string_list_setlen() is that
this is a blessed pattern, so shouldn't need a comment.
Thanks,
Taylor
next prev parent reply other threads:[~2023-04-24 21:19 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-13 23:31 [PATCH 0/5] banned: mark `strok()`, `strtok_r()` as banned Taylor Blau
2023-04-13 23:31 ` [PATCH 1/5] string-list: introduce `string_list_split_in_place_multi()` Taylor Blau
2023-04-18 10:10 ` Jeff King
2023-04-18 17:08 ` Taylor Blau
2023-04-13 23:31 ` [PATCH 2/5] t/helper/test-hashmap.c: avoid using `strtok()` Taylor Blau
2023-04-18 10:23 ` Jeff King
2023-04-18 18:06 ` Taylor Blau
2023-04-13 23:31 ` [PATCH 3/5] t/helper/test-oidmap.c: " Taylor Blau
2023-04-13 23:31 ` [PATCH 4/5] t/helper/test-json-writer.c: " Taylor Blau
2023-04-13 23:31 ` [PATCH 5/5] banned.h: mark `strtok()`, `strtok_r()` as banned Taylor Blau
2023-04-14 1:39 ` Junio C Hamano
2023-04-14 2:08 ` Chris Torek
2023-04-14 13:41 ` Taylor Blau
2023-04-18 19:18 ` [PATCH v2 0/6] banned: mark `strok()` " Taylor Blau
2023-04-18 19:18 ` [PATCH v2 1/6] string-list: introduce `string_list_split_in_place_multi()` Taylor Blau
2023-04-18 19:39 ` Junio C Hamano
2023-04-18 20:54 ` Taylor Blau
2023-04-22 11:12 ` Jeff King
2023-04-22 15:53 ` René Scharfe
2023-04-23 0:35 ` Jeff King
2023-04-24 16:24 ` Junio C Hamano
2023-04-23 2:38 ` [PATCH v2 1/6] string-list: introduce `string_list_split_in_place_multi()`t Taylor Blau
2023-04-23 2:40 ` Taylor Blau
2023-04-18 19:18 ` [PATCH v2 2/6] string-list: introduce `string_list_setlen()` Taylor Blau
2023-04-22 11:14 ` Jeff King
2023-04-18 19:18 ` [PATCH v2 3/6] t/helper/test-hashmap.c: avoid using `strtok()` Taylor Blau
2023-04-22 11:16 ` Jeff King
2023-04-24 21:19 ` Taylor Blau [this message]
2023-04-18 19:18 ` [PATCH v2 4/6] t/helper/test-oidmap.c: " Taylor Blau
2023-04-18 19:18 ` [PATCH v2 5/6] t/helper/test-json-writer.c: " Taylor Blau
2023-04-18 19:18 ` [PATCH v2 6/6] banned.h: mark `strtok()` as banned Taylor Blau
2023-04-24 22:20 ` [PATCH v3 0/6] banned: mark `strok()`, `strtok_r()` " Taylor Blau
2023-04-24 22:20 ` [PATCH v3 1/6] string-list: multi-delimiter `string_list_split_in_place()` Taylor Blau
2023-04-24 22:20 ` [PATCH v3 2/6] string-list: introduce `string_list_setlen()` Taylor Blau
2023-04-25 6:21 ` Jeff King
2023-04-25 21:00 ` Taylor Blau
2023-04-24 22:20 ` [PATCH v3 3/6] t/helper/test-hashmap.c: avoid using `strtok()` Taylor Blau
2023-04-24 22:20 ` [PATCH v3 4/6] t/helper/test-oidmap.c: " Taylor Blau
2023-04-24 22:20 ` [PATCH v3 5/6] t/helper/test-json-writer.c: " Taylor Blau
2023-04-25 13:57 ` Jeff Hostetler
2023-04-24 22:20 ` [PATCH v3 6/6] banned.h: mark `strtok()` and `strtok_r()` as banned Taylor Blau
2023-04-24 22:25 ` Chris Torek
2023-04-24 23:00 ` Taylor Blau
2023-04-25 6:26 ` Jeff King
2023-04-25 21:02 ` Taylor Blau
2023-04-25 6:27 ` [PATCH v3 0/6] banned: mark `strok()`, " Jeff King
2023-04-25 21:03 ` Taylor Blau
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=ZEbyVDWhSGAyKDJL@nand.local \
--to=me@ttaylorr.com \
--cc=chris.torek@gmail.com \
--cc=git@vger.kernel.org \
--cc=gitster@pobox.com \
--cc=peff@peff.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).