efivars: introduce utf16_strncmp

[firefly-linux-kernel-4.4.55.git] / drivers / firmware / efivars.c

diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 4202a31704673a9b938de84be1a8b581e3427067..15b9a01b6c685ad07ddb572ec2ab0919ceb9993b 100644 (file)
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -169,6 +169,24 @@ utf16_strsize(efi_char16_t *data, unsigned long maxlength)
        return utf16_strnlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t);
 }
 
+static inline int
+utf16_strncmp(const efi_char16_t *a, const efi_char16_t *b, size_t len)
+{
+       while (1) {
+               if (len == 0)
+                       return 0;
+               if (*a < *b)
+                       return -1;
+               if (*a > *b)
+                       return 1;
+               if (*a == 0) /* implies *b == 0 */
+                       return 0;
+               a++;
+               b++;
+               len--;
+       }
+}
+
 static efi_status_t
 get_var_data_locked(struct efivars *efivars, struct efi_variable *var)
 {