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authorLinus Torvalds <torvalds@linux-foundation.org>2010-01-16 12:27:25 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-16 12:27:25 -0800
commit6ccc347b699681a0b21c2f7b1a1f85500a58c6b8 (patch)
treeabe33c75ae53d445abde0e5986b96ef696501d38 /lib
parenteb29a5cc0b601c458bae9df2f6c3696d75c2d383 (diff)
parentd1303dd1d6b220cab375f24fa91a5640e54e169e (diff)
downloadlinux-2.6.34-ux500-6ccc347b699681a0b21c2f7b1a1f85500a58c6b8.tar.gz
Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: tracing/filters: Add comment for match callbacks tracing/filters: Fix MATCH_FULL filter matching for PTR_STRING tracing/filters: Fix MATCH_MIDDLE_ONLY filter matching lib: Introduce strnstr() tracing/filters: Fix MATCH_END_ONLY filter matching tracing/filters: Fix MATCH_FRONT_ONLY filter matching ftrace: Fix MATCH_END_ONLY function filter tracing/x86: Derive arch from bits argument in recordmcount.pl ring-buffer: Add rb_list_head() wrapper around new reader page next field ring-buffer: Wrap a list.next reference with rb_list_head()
Diffstat (limited to 'lib')
-rw-r--r--lib/string.c27
1 files changed, 26 insertions, 1 deletions
diff --git a/lib/string.c b/lib/string.c
index 9f75b4ec50b..a1cdcfcc42d 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -667,7 +667,7 @@ EXPORT_SYMBOL(memscan);
*/
char *strstr(const char *s1, const char *s2)
{
- int l1, l2;
+ size_t l1, l2;
l2 = strlen(s2);
if (!l2)
@@ -684,6 +684,31 @@ char *strstr(const char *s1, const char *s2)
EXPORT_SYMBOL(strstr);
#endif
+#ifndef __HAVE_ARCH_STRNSTR
+/**
+ * strnstr - Find the first substring in a length-limited string
+ * @s1: The string to be searched
+ * @s2: The string to search for
+ * @len: the maximum number of characters to search
+ */
+char *strnstr(const char *s1, const char *s2, size_t len)
+{
+ size_t l1 = len, l2;
+
+ l2 = strlen(s2);
+ if (!l2)
+ return (char *)s1;
+ while (l1 >= l2) {
+ l1--;
+ if (!memcmp(s1, s2, l2))
+ return (char *)s1;
+ s1++;
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(strnstr);
+#endif
+
#ifndef __HAVE_ARCH_MEMCHR
/**
* memchr - Find a character in an area of memory.