linux-kernel - [PATCH 4/4] lib/vsprintf.c: Replace while with do-while in skip

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Message-Id: <1420719287-10222-4-git-send-email-linux@rasmusvillemoes.dk>
Date:	Thu,  8 Jan 2015 13:14:47 +0100
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Randy Dunlap <rdunlap@...radead.org>
Cc:	Rasmus Villemoes <linux@...musvillemoes.dk>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] lib/vsprintf.c: Replace while with do-while in skip_atoi

All callers of skip_atoi have already checked for the first character
being a digit. In this case, gcc generates simpler code for a do
while-loop.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 lib/vsprintf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 1ec6a78f169b..e152da53cbd2 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -114,8 +114,9 @@ int skip_atoi(const char **s)
 {
 	int i = 0;
 
-	while (isdigit(**s))
+	do {
 		i = i*10 + *((*s)++) - '0';
+	} while (isdigit(**s));
 
 	return i;
 }
-- 
2.1.3

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