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Message-Id: <1421269311-28965-1-git-send-email-linux@rasmusvillemoes.dk>
Date: Wed, 14 Jan 2015 22:01:51 +0100
From: Rasmus Villemoes <linux@...musvillemoes.dk>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>,
linux-kernel@...r.kernel.org
Subject: [PATCH] lib/string.c: Improve strrchr
Instead of potentially passing over the string twice in case c is not
found, just keep track of the last occurrence. According to
bloat-o-meter, this also cuts the generated code by a third (54 vs 36
bytes). Oh, and we get rid of those 7-space indented lines.
Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
lib/string.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/lib/string.c b/lib/string.c
index 10063300b830..f112a7fd1893 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -321,12 +321,12 @@ EXPORT_SYMBOL(strchrnul);
*/
char *strrchr(const char *s, int c)
{
- const char *p = s + strlen(s);
- do {
- if (*p == (char)c)
- return (char *)p;
- } while (--p >= s);
- return NULL;
+ const char *last = NULL;
+ do {
+ if (*s == (char)c)
+ last = s;
+ } while (*s++);
+ return (char *)last;
}
EXPORT_SYMBOL(strrchr);
#endif
--
2.1.3
--
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