linux-kernel - [PATCH v5 02/12] vsprintf: pre-calculate final string length for later use

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Message-Id: <5687c764e200cd3a1c0a1ca7704265921e1362fb.1258181837.git.andre.goddard@gmail.com>
Date:	Sat, 14 Nov 2009 05:11:50 -0200
From:	André Goddard Rosa <andre.goddard@...il.com>
To:	"linux list" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	André Goddard Rosa <andre.goddard@...il.com>
Subject: [PATCH v5 02/12] vsprintf: pre-calculate final string length for later use

Signed-off-by: André Goddard Rosa <andre.goddard@...il.com>
Acked-by: Frederic Weisbecker <fweisbec@...il.com>
---
 lib/vsprintf.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index fe56825..1e08b0d 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1443,13 +1443,14 @@ do {									\
 		case FORMAT_TYPE_STR: {
 			const char *save_str = va_arg(args, char *);
 			size_t len;
+
 			if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
 					|| (unsigned long)save_str < PAGE_SIZE)
 				save_str = "(null)";
-			len = strlen(save_str);
-			if (str + len + 1 < end)
-				memcpy(str, save_str, len + 1);
-			str += len + 1;
+			len = strlen(save_str) + 1;
+			if (str + len < end)
+				memcpy(str, save_str, len);
+			str += len;
 			break;
 		}
 
-- 
1.6.5.2.180.gc5b3e.dirty

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