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lib/string.c: improve strrchr()

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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@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rasmus Villemoes 2015-02-13 14:36:44 -08:00 • committed by Linus Torvalds
parent fcc139ae22
commit 8da53d4595
1 changed files with 6 additions and 6 deletions
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10
lib/string.c
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@ -313,12 +313,12 @@ EXPORT_SYMBOL(strchrnul);
*/ */
char *strrchr(const char *s, int c) char *strrchr(const char *s, int c)
{ {
const char *p = s + strlen(s); const char *last = NULL;
do { do {
if (*p == (char)c) if (*s == (char)c)
return (char *)p; last = s;
} while (--p >= s); } while (*s++);
return NULL; return (char *)last;
} }
EXPORT_SYMBOL(strrchr); EXPORT_SYMBOL(strrchr);
#endif #endif