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@xxxxxxxxxxxxxxx>
---
include/linux/string.h | 10 ++++++++++
lib/string.c | 26 ++++++++++++++++++++++++++
2 files changed, 36 insertions(+)
diff --git a/include/linux/string.h b/include/linux/string.h
index 26b6f6a66f83..c4011b28f3d8 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -135,6 +135,16 @@ static inline int strtobool(const char *s, bool *res)
}
int match_string(const char * const *array, size_t n, const char *string);
+int __sysfs_match_string(const char * const *array, size_t n, const char *s);
+
+/**
+ * sysfs_match_string - matches given string in an array
+ * @_a: array of strings
+ * @_s: string to match with
+ *
+ * Helper for __sysfs_match_string(). Calculates the size of @a automatically.
+ */
+#define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
#ifdef CONFIG_BINARY_PRINTF
int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
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
--
2.11.0
--
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