ata: hpt366: convert to use match_string() helper

[deliverable/linux.git] / lib / string.c

diff --git a/lib/string.c b/lib/string.c
index 0323c0d5629af31e674bcfa24624e0917e2bb80d..e9c9db161d2cf4f7a5d01bb9c707288f3811955e 100644 (file)
--- a/lib/string.c
+++ b/lib/string.c
@@ -630,6 +630,32 @@ bool sysfs_streq(const char *s1, const char *s2)
 }
 EXPORT_SYMBOL(sysfs_streq);
 
+/**
+ * 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
+ * @string:    string to match with
+ *
+ * Return:
+ * index of a @string in the @array if matches, or %-EINVAL otherwise.
+ */
+int match_string(const char * const *array, size_t n, const char *string)
+{
+       int index;
+       const char *item;
+
+       for (index = 0; index < n; index++) {
+               item = array[index];
+               if (!item)
+                       break;
+               if (!strcmp(item, string))
+                       return index;
+       }
+
+       return -EINVAL;
+}
+EXPORT_SYMBOL(match_string);
+
 /**
  * strtobool - convert common user inputs into boolean values
  * @s: input string