From: Marco Costalba <mcostalba@gmail.com>
Date: Sun, 22 Jul 2007 08:23:05 +0000 (+0200)
Subject: Avoid to duplicate commit message when is not encoded
X-Git-Tag: v1.5.3-rc3~23
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=c4640fe8d9e25fd3e206a39233c71a6dbb68917e;p=git.git

Avoid to duplicate commit message when is not encoded

When a commit message doesn't have encoding information
and encoding output is utf-8 (default) then an useless
xstrdup() of commit message is done.

If we assume most of users live in an utf-8 world, this
useless copy is the common case.

Performance issue found with KCachegrind.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/commit.c b/commit.c
index 4c5dfa9af..dc5a0643f 100644
--- a/commit.c
+++ b/commit.c
@@ -721,7 +721,10 @@ static char *logmsg_reencode(const struct commit *commit,
 	encoding = get_header(commit, "encoding");
 	use_encoding = encoding ? encoding : utf8;
 	if (!strcmp(use_encoding, output_encoding))
-		out = xstrdup(commit->buffer);
+		if (encoding) /* we'll strip encoding header later */
+			out = xstrdup(commit->buffer);
+		else
+			return NULL; /* nothing to do */
 	else
 		out = reencode_string(commit->buffer,
 				      output_encoding, use_encoding);