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From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Cc: Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v3 2/2] git_path(): handle `.lock` files correctly
Date: Mon, 28 Oct 2019 13:32:14 +0100	[thread overview]
Message-ID: <20191028123214.GT4348@szeder.dev> (raw)
In-Reply-To: <nycvar.QRO.7.76.6.1910281225260.46@tvgsbejvaqbjf.bet>

On Mon, Oct 28, 2019 at 01:01:49PM +0100, Johannes Schindelin wrote:
> > > @@ -349,10 +349,16 @@ static int check_common(const char *unmatched, void *value, void *baton)
> > >  static void update_common_dir(struct strbuf *buf, int git_dir_len,
> > >  			      const char *common_dir)
> > >  {
> > > -	char *base = buf->buf + git_dir_len;
> > > +	char *base = buf->buf + git_dir_len, *base2 = NULL;
> > > +
> > > +	if (ends_with(base, ".lock"))
> > > +		base = base2 = xstrndup(base, strlen(base) - 5);
> >
> > Hm, this adds the magic number 5 and calls strlen(base) twice, because
> > ends_with() calls strip_suffix(), which calls strlen().  Calling
> > strip_suffix() directly would allow us to avoid the magic number and
> > the second strlen():
> >
> >   size_t len;
> >   if (strip_suffix(base, ".lock", &len))
> >           base = base2 = xstrndup(base, len);
> 
> Actually, we should probably avoid the extra allocation. Earlier, I was
> concerned about multi-threading issues when attempting to modify the
> `strbuf`. But then, we modify that `strbuf` a couple of lines later
> anyway,

Do we?  You're right, we do indeed, because in replace_dir(buf, ...)
we call strbuf_splice(buf, ...).
OK, then your suggestion below is even better.

> so my fears were totally unfounded. Therefore, my current
> version reads like this:
> 
> -- snip --
> 	int has_lock_suffix = strbuf_strip_suffix(buf, LOCK_SUFFIX);
> 
> 	init_common_trie();
> 	if (trie_find(&common_trie, base, check_common, NULL) > 0)
> 		replace_dir(buf, git_dir_len, common_dir);
> 
> 	if (has_lock_suffix)
> 		strbuf_addstr(buf, LOCK_SUFFIX);
> -- snap --

  reply	other threads:[~2019-10-28 12:32 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-16  7:07 [PATCH 0/2] Handle git_path() with lock files correctly in worktrees Johannes Schindelin via GitGitGadget
2019-10-16  7:07 ` [PATCH 1/2] t1400: wrap setup code in test case Johannes Schindelin via GitGitGadget
2019-10-16  7:07 ` [PATCH 2/2] git_path(): handle `.lock` files correctly Johannes Schindelin via GitGitGadget
2019-10-16 11:04   ` SZEDER Gábor
2019-10-17  7:15     ` Junio C Hamano
2019-10-17 22:05     ` Johannes Schindelin
2019-10-18 11:06       ` SZEDER Gábor
2019-10-18 11:35         ` SZEDER Gábor
2019-10-21 16:00           ` [PATCH 0/5] path.c: a couple of common dir/trie fixes SZEDER Gábor
2019-10-21 16:00             ` [PATCH 1/5] Documentation: mention more worktree-specific exceptions SZEDER Gábor
2019-10-21 16:00             ` [PATCH 2/5] path.c: clarify trie_find()'s in-code comment SZEDER Gábor
2019-10-21 16:00             ` [PATCH 3/5] path.c: mark 'logs/HEAD' in 'common_list' as file SZEDER Gábor
2019-10-21 16:00             ` [PATCH 4/5] path.c: clarify two field names in 'struct common_dir' SZEDER Gábor
2019-10-21 16:00             ` [PATCH 5/5] path.c: don't call the match function without value in trie_find() SZEDER Gábor
2019-10-21 17:39               ` David Turner
2019-10-21 20:57               ` SZEDER Gábor
2019-10-23  4:01                 ` Junio C Hamano
2019-10-23 16:20                   ` SZEDER Gábor
2019-10-24  3:29                     ` Junio C Hamano
2019-10-28 10:57               ` Johannes Schindelin
2019-10-28 12:00                 ` SZEDER Gábor
2019-10-28 21:30                   ` Johannes Schindelin
2019-10-18 11:42         ` [PATCH 0/2] path.c: minor common_list fixes SZEDER Gábor
2019-10-18 11:42           ` [PATCH 1/2] path.c: fix field name in 'struct common_dir' SZEDER Gábor
2019-10-18 11:42           ` [PATCH 2/2] path.c: mark 'logs/HEAD' in 'common_list' as file SZEDER Gábor
2019-10-21 19:35           ` [PATCH 0/2] path.c: minor common_list fixes Johannes Schindelin
2019-10-17 22:07 ` [PATCH v2 0/2] Handle git_path() with lock files correctly in worktrees Johannes Schindelin via GitGitGadget
2019-10-17 22:07   ` [PATCH v2 1/2] t1400: wrap setup code in test case Johannes Schindelin via GitGitGadget
2019-10-17 22:07   ` [PATCH v2 2/2] git_path(): handle `.lock` files correctly Johannes Schindelin via GitGitGadget
2019-10-18  1:23     ` Junio C Hamano
2019-10-18 12:35       ` SZEDER Gábor
2019-10-21 20:26       ` Johannes Schindelin
2019-10-23  2:12         ` Junio C Hamano
2019-10-21 21:54   ` [PATCH v3 0/2] Handle git_path() with lock files correctly in worktrees Johannes Schindelin via GitGitGadget
2019-10-21 21:54     ` [PATCH v3 1/2] t1400: wrap setup code in test case Johannes Schindelin via GitGitGadget
2019-10-21 21:54     ` [PATCH v3 2/2] git_path(): handle `.lock` files correctly Johannes Schindelin via GitGitGadget
2019-10-22 16:01       ` SZEDER Gábor
2019-10-23  3:38         ` Junio C Hamano
2019-10-28 12:01         ` Johannes Schindelin
2019-10-28 12:32           ` SZEDER Gábor [this message]
2019-10-28 17:30           ` Junio C Hamano
2019-10-28 12:57     ` [PATCH v4 0/2] Handle git_path() with lock files correctly in worktrees Johannes Schindelin via GitGitGadget
2019-10-28 12:57       ` [PATCH v4 1/2] t1400: wrap setup code in test case Johannes Schindelin via GitGitGadget
2019-10-28 12:57       ` [PATCH v4 2/2] git_path(): handle `.lock` files correctly Johannes Schindelin via GitGitGadget
2019-10-29  3:39       ` [PATCH v4 0/2] Handle git_path() with lock files correctly in worktrees Junio C Hamano

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