lib: charset: add u16_str<n>cmp()
u16 version of strcmp(): u16_strncmp() works like u16_strcmp() but only
at most n characters (in u16) are compared.
This function will be used in my UEFI secure boot patch.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/include/charset.h b/include/charset.h
index 020f8a9..fde6bdd 100644
--- a/include/charset.h
+++ b/include/charset.h
@@ -168,6 +168,21 @@
*/
s32 utf_to_upper(const s32 code);
+/*
+ * u16_strncmp() - compare two u16 string
+ *
+ * @s1: first string to compare
+ * @s2: second string to compare
+ * @n: maximum number of u16 to compare
+ * Return: 0 if the first n u16 are the same in s1 and s2
+ * < 0 if the first different u16 in s1 is less than the
+ * corresponding u16 in s2
+ * > 0 if the first different u16 in s1 is greater than the
+ * corresponding u16 in s2
+ */
+int u16_strncmp(const u16 *s1, const u16 *s2, size_t n);
+#define u16_strcmp(s1, s2) u16_strncmp((s1), (s2), SIZE_MAX)
+
/**
* u16_strlen - count non-zero words
*