From: Pierre Habouzit <madcoder@debian.org>
To: "Kristian Høgsberg" <krh@redhat.com>
Cc: git@vger.kernel.org
Subject: Re: [PATCH 2/7] Simplify strbuf uses in archive-tar.c using the proper functions.
Date: Thu, 06 Sep 2007 20:08:58 +0200 [thread overview]
Message-ID: <20070906180858.GJ8451@artemis.corp> (raw)
In-Reply-To: <1189101569.3423.17.camel@hinata.boston.redhat.com>
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On Thu, Sep 06, 2007 at 05:59:29PM +0000, Kristian Høgsberg wrote:
> On Thu, 2007-09-06 at 13:20 +0200, Pierre Habouzit wrote:
> > + strbuf_grow(sb, len);
> > + strbuf_addf(sb, "%u %s=", len, keyword);
> > + strbuf_add(sb, value, valuelen);
> > + strbuf_addch(sb, '\n');
> > }
>
> This entire function can be collapsed to just:
>
> strbuf_addf(sb, "%u %s=%.*s\n", len, keyword, valuelen, value);
yes, but it's less efficient, because %.*s says that sprintf must copy
at most valuelen bytes from value, but it still has to stop if it finds
a \0 before. And the strbuf_grow has sense because the extend policy at
snprintf time is optimistic: we try to write, and if it didn't fit, we
try again. So there is a huge benefit if we have a clue of the final
size.
I would not change a thing.
> > + strbuf_init(&ext_header);
>
> Just use your STRBUF_INIT macro?
Many people dilike it, I'm not sure it's a good idea either, and the
performance hit should be negligible, if it's not, then we can still
make the _init() function an inline.
> > if (ext_header.len > 0) {
> > write_entry(sha1, NULL, 0, ext_header.buf, ext_header.len);
> > - free(ext_header.buf);
> > }
>
> Remove excess braces?
bah, I don't like to strip braces so I won't do that, else you end up
with stupidities like:
if (foo)
// bar();
do_some_very_important_stuff();
Call me paranoid but well, it saved me so many times ...
> > - memcpy(path.buf, base, baselen);
> > - memcpy(path.buf + baselen, filename, filenamelen);
> > - path.len = baselen + filenamelen;
> > - path.buf[path.len] = '\0';
> > + strbuf_grow(&path, MAX(PATH_MAX, baselen + filenamelen + 1));
> > + strbuf_reset(&path);
>
> Does strbuf_reset() do anything here?
>
> > + strbuf_add(&path, base, baselen);
Yes _reset() sets length to 0. so the add here will write at the start
of the buffer again. It definitely is important !
--
·O· Pierre Habouzit
··O madcoder@debian.org
OOO http://www.madism.org
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next prev parent reply other threads:[~2007-09-06 18:09 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-02 22:42 strbuf API Pierre Habouzit
2007-09-03 5:43 ` Johan Herland
2007-09-03 8:46 ` Pierre Habouzit
2007-09-04 1:52 ` Miles Bader
2007-09-04 8:47 ` strbuf new semantics, let's give it a try Pierre Habouzit
2007-09-04 8:47 ` [PATCH] Rework strbuf API and semantics Pierre Habouzit
2007-09-04 11:11 ` Johannes Schindelin
2007-09-04 11:53 ` Pierre Habouzit
2007-09-04 13:34 ` Andreas Ericsson
2007-09-04 14:01 ` Pierre Habouzit
2007-09-04 15:44 ` Johannes Schindelin
2007-09-04 16:18 ` Pierre Habouzit
2007-09-04 17:18 ` Wincent Colaiuta
2007-09-04 14:01 ` [PATCH] Simplify strbuf uses in fast-import.c using the proper functions Pierre Habouzit
2007-09-04 23:46 ` René Scharfe
2007-09-04 23:46 ` René Scharfe
2007-09-05 7:48 ` Pierre Habouzit
2007-09-05 8:05 ` Junio C Hamano
2007-09-05 8:57 ` Pierre Habouzit
2007-09-05 19:18 ` [PATCH] Rework strbuf API and semantics Pierre Habouzit
2007-09-05 19:18 ` [PATCH] Simplify strbuf uses in archive-tar.c using the proper functions Pierre Habouzit
2007-09-05 19:18 ` [PATCH] Simplify strbuf uses in fast-import.c " Pierre Habouzit
2007-09-05 19:18 ` [PATCH] Use proper strbuf API, and also simplify cmd_data code Pierre Habouzit
2007-09-05 19:18 ` [PATCH] Simplify write_tree using strbuf's Pierre Habouzit
2007-09-05 19:18 ` [PATCH] Further strbuf re-engineering Pierre Habouzit
2007-09-05 19:18 ` [PATCH] Eradicate yet-another-buffer implementation in buitin-rerere.c Pierre Habouzit
2007-09-05 19:18 ` [PATCH] More strbuf uses in cache-tree.c Pierre Habouzit
2007-09-19 8:05 ` [PATCH] Further strbuf re-engineering Junio C Hamano
2007-09-05 19:21 ` [PATCH] Simplify strbuf uses in fast-import.c using the proper functions Pierre Habouzit
2007-09-19 8:06 ` [PATCH] Simplify strbuf uses in archive-tar.c " Junio C Hamano
2007-09-19 8:36 ` Pierre Habouzit
2007-09-06 9:31 ` [PATCH] Rework strbuf API and semantics Junio C Hamano
2007-09-06 9:49 ` Pierre Habouzit
2007-09-06 10:03 ` Junio C Hamano
2007-09-06 10:22 ` Pierre Habouzit
2007-09-04 14:01 ` [PATCH] Use proper strbuf API, and also simplify cmd_data code Pierre Habouzit
2007-09-05 4:44 ` [PATCH] Rework strbuf API and semantics Miles Bader
2007-09-04 8:48 ` [PATCH] Add strbuf_fread, use it in fast-import.c Pierre Habouzit
2007-09-03 8:32 ` strbuf API Matthieu Moy
2007-09-03 8:49 ` Pierre Habouzit
2007-09-03 9:02 ` Matthieu Moy
2007-09-03 9:18 ` Junio C Hamano
2007-09-03 11:53 ` Pierre Habouzit
2007-09-03 12:29 ` Johannes Schindelin
2007-09-06 11:20 ` strbuf new API, take 2 for inclusion Pierre Habouzit
2007-09-06 11:20 ` [PATCH 1/7] Rework strbuf API and semantics Pierre Habouzit
2007-09-06 11:20 ` [PATCH 2/7] Simplify strbuf uses in archive-tar.c using the proper functions Pierre Habouzit
2007-09-06 11:20 ` [PATCH 3/7] Use proper strbuf API, and also simplify cmd_data code Pierre Habouzit
2007-09-06 11:20 ` [PATCH 4/7] Simplify write_tree using strbuf's Pierre Habouzit
2007-09-06 11:20 ` [PATCH 5/7] Further strbuf re-engineering Pierre Habouzit
2007-09-06 11:20 ` [PATCH 6/7] Eradicate yet-another-buffer implementation in buitin-rerere.c Pierre Habouzit
2007-09-06 11:20 ` [PATCH 7/7] More strbuf uses in cache-tree.c Pierre Habouzit
2007-09-06 14:05 ` [PATCH 6/7] Eradicate yet-another-buffer implementation in buitin-rerere.c Johannes Schindelin
2007-09-06 17:17 ` Pierre Habouzit
2007-09-06 20:16 ` David Kastrup
2007-09-06 20:54 ` Pierre Habouzit
2007-09-07 8:03 ` Junio C Hamano
2007-09-07 9:02 ` Pierre Habouzit
2007-09-06 17:59 ` [PATCH 2/7] Simplify strbuf uses in archive-tar.c using the proper functions Kristian Høgsberg
2007-09-06 18:08 ` Pierre Habouzit [this message]
2007-09-06 18:18 ` Kristian Høgsberg
2007-09-06 18:27 ` Pierre Habouzit
2007-09-06 22:54 ` René Scharfe
2007-09-06 14:09 ` [PATCH 1/7] Rework strbuf API and semantics Johannes Schindelin
2007-09-06 14:21 ` Jeff King
2007-09-06 14:44 ` David Kastrup
2007-09-06 14:50 ` Jeff King
2007-09-06 15:06 ` David Kastrup
2007-09-06 15:36 ` Jeff King
2007-09-06 15:53 ` David Kastrup
2007-09-06 15:45 ` Johannes Sixt
2007-09-06 14:43 ` David Kastrup
2007-09-06 14:52 ` Jeff King
2007-09-06 17:49 ` Kristian Høgsberg
2007-09-06 12:58 ` strbuf new API, take 2 for inclusion Jeff King
2007-09-06 17:15 ` Pierre Habouzit
2007-09-06 17:16 ` Jeff King
2007-09-06 17:19 ` Pierre Habouzit
2007-09-08 11:53 ` Use strbufs in commit.c (pretty printing) Pierre Habouzit
2007-09-08 11:53 ` [PATCH 1/3] Add strbuf_rtrim (to remove trailing spaces) Pierre Habouzit
2007-09-08 11:53 ` [PATCH 2/3] Change semantics of interpolate to work like snprintf Pierre Habouzit
2007-09-08 11:53 ` [PATCH 3/3] Rework pretty_print_commit to use strbufs instead of custom buffers Pierre Habouzit
2007-09-08 11:59 ` David Kastrup
2007-09-08 12:17 ` Pierre Habouzit
2007-09-08 12:28 ` Pierre Habouzit
2007-09-08 18:40 ` René Scharfe
2007-09-08 18:49 ` Pierre Habouzit
2007-09-08 16:18 ` [PATCH 1/3] Add strbuf_rtrim (to remove trailing spaces) René Scharfe
2007-09-08 22:53 ` Pierre Habouzit
2007-09-08 23:44 ` Pierre Habouzit
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