[U-Boot] [PATCH v2 01/11] lib: charset: add u16_strcmp()

[AKASHI Takahiro]

u16 version of strcmp()

AUTHER: Patrick Wildt <patrick at blueri.se>
Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
 include/charset.h |  5 +++++
 lib/charset.c     | 10 ++++++++++
 2 files changed, 15 insertions(+)

diff --git a/include/charset.h b/include/charset.h
index 65087f76d1fc..747a9b376c03 100644
--- a/include/charset.h
+++ b/include/charset.h
@@ -166,6 +166,11 @@ s32 utf_to_lower(const s32 code);
  */
 s32 utf_to_upper(const s32 code);
 
+/*
+ * u16_strcmp() - strcmp() for u16 strings
+ */
+int u16_strcmp(const u16 *s1, const u16 *s2);
+
 /**
  * u16_strlen - count non-zero words
  *
diff --git a/lib/charset.c b/lib/charset.c
index 5e349ed5ee45..4a25ac0bdb9c 100644
--- a/lib/charset.c
+++ b/lib/charset.c
@@ -335,6 +335,16 @@ s32 utf_to_upper(const s32 code)
 	return ret;
 }
 
+int u16_strcmp(const u16 *s1, const u16 *s2)
+{
+	while (*s1 == *s2++)
+		if (*s1++ == 0)
+			return (0);
+	--s2;
+
+	return (*(uint16_t *)s1 - *(uint16_t *)s2);
+}
+
 size_t u16_strlen(const u16 *in)
 {
 	size_t i;
-- 
2.20.1