linux-kernel - [PATCH v2 7/7] vsprintf: factor out skip

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Date:	Mon, 2 Nov 2009 15:26:55 -0200
From:	André Goddard Rosa <andre.goddard@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>, laijs@...fujitsu.com,
	mingo@...e.hu, davem@...emloft.net, akpm@...ux-foundation.org,
	harvey.harrison@...il.com,
	linux list <linux-kernel@...r.kernel.org>
Cc:	me <andre.goddard@...il.com>
Subject: [PATCH v2 7/7] vsprintf: factor out skip_space code in a separate 
	function

>From 584d9bfc7c1d41b76a05655b4562b98fcbef6ee4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Goddard=20Rosa?= <andre.goddard@...il.com>
Date: Sun, 1 Nov 2009 14:09:06 -0200
Subject: [PATCH v2 7/7] vsprintf: factor out skip_space code in a
separate function
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

It decreases code size:
   text    data     bss     dec     hex filename
  15703       0       8   15711    3d5f lib/vsprintf.o-before
  15527       0       8   15535    3caf lib/vsprintf.o-after

Signed-off-by: André Goddard Rosa <andre.goddard@...il.com>
---
 lib/vsprintf.c |   19 +++++++++++--------
 1 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 957e252..c3b19d7 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1745,6 +1745,13 @@ EXPORT_SYMBOL_GPL(bprintf);

 #endif /* CONFIG_BINARY_PRINTF */

+static noinline const char *skip_space(const char *str)
+{
+	while (isspace(*str))
+		++str;
+	return str;
+}
+
 /**
  * vsscanf - Unformat a buffer into a list of arguments
  * @buf:	input buffer
@@ -1766,10 +1773,8 @@ int vsscanf(const char *buf, const char *fmt,
va_list args)
 		 * white space, including none, in the input.
 		 */
 		if (isspace(*fmt)) {
-			while (isspace(*fmt))
-				++fmt;
-			while (isspace(*str))
-				++str;
+			fmt = skip_space(fmt);
+			str = skip_space(str);
 		}

 		/* anything that is not a conversion must match exactly */
@@ -1839,8 +1844,7 @@ int vsscanf(const char *buf, const char *fmt,
va_list args)
 			if (field_width == -1)
 				field_width = INT_MAX;
 			/* first, skip leading white space in buffer */
-			while (isspace(*str))
-				str++;
+			str = skip_space(str);

 			/* now copy until next white space */
 			while (*str && !isspace(*str) && field_width--)
@@ -1882,8 +1886,7 @@ int vsscanf(const char *buf, const char *fmt,
va_list args)
 		/* have some sort of integer conversion.
 		 * first, skip white space in buffer.
 		 */
-		while (isspace(*str))
-			str++;
+		str = skip_space(str);

 		digit = *str;
 		if (is_sign && digit == '-')
-- 
1.6.5.2.140.g5f809
--
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