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authorHeikki Krogerus <heikki.krogerus@linux.intel.com>2017-03-21 14:56:46 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-23 15:48:44 +0300
commite1fe7b6a7b376bfb54558725ddb2a89aaaa4adcc (patch)
tree2f0f4a94cdb3c915aeb1fdbb60c1753868107743 /lib
parent8b373ffc797713337f42f0e58d832d5cae86752c (diff)
downloadlinux-e1fe7b6a7b376bfb54558725ddb2a89aaaa4adcc.tar.xz
lib/string: add sysfs_match_string helper
Make a simple helper for matching strings with sysfs attribute files. In most parts the same as match_string(), except sysfs_match_string() uses sysfs_streq() instead of strcmp() for matching. This is more convenient when used with sysfs attributes. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Reviewed-by: Felipe Balbi <felipe.balbi@linux.intel.com> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/string.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c
index ed83562a53ae..1a7d3fd52541 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -656,6 +656,32 @@ int match_string(const char * const *array, size_t n, const char *string)
}
EXPORT_SYMBOL(match_string);
+/**
+ * __sysfs_match_string - matches given string in an array
+ * @array: array of strings
+ * @n: number of strings in the array or -1 for NULL terminated arrays
+ * @str: string to match with
+ *
+ * Returns index of @str in the @array or -EINVAL, just like match_string().
+ * Uses sysfs_streq instead of strcmp for matching.
+ */
+int __sysfs_match_string(const char * const *array, size_t n, const char *str)
+{
+ const char *item;
+ int index;
+
+ for (index = 0; index < n; index++) {
+ item = array[index];
+ if (!item)
+ break;
+ if (sysfs_streq(item, str))
+ return index;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL(__sysfs_match_string);
+
#ifndef __HAVE_ARCH_MEMSET
/**
* memset - Fill a region of memory with the given value