Provide a function for comparing UTF-16 strings in a case insensitive
manner.
Signed-off-by: Heinrich Schuchardt <heinrich.schucha...@canonical.com>
---
include/charset.h | 13 +++++++++++++
lib/charset.c | 26 ++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/include/charset.h b/include/charset.h
index e900fd789a..6e79d7152e 100644
--- a/include/charset.h
+++ b/include/charset.h
@@ -173,6 +173,19 @@ s32 utf_to_lower(const s32 code);
*/
s32 utf_to_upper(const s32 code);
+/**
+ * u16_strcasecmp() - compare two u16 strings case insensitively
+ *
+ * @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
+ */
+int u16_strcasecmp(const u16 *s1, const u16 *s2);
+
/**
* u16_strncmp() - compare two u16 string
*
diff --git a/lib/charset.c b/lib/charset.c
index bece4985bf..b1842755eb 100644
--- a/lib/charset.c
+++ b/lib/charset.c
@@ -350,6 +350,32 @@ s32 utf_to_upper(const s32 code)
return ret;
}
+/*
+ * u16_strcasecmp() - compare two u16 strings case insensitively
+ *
+ * @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
+ */
+int u16_strcasecmp(const u16 *s1, const u16 *s2)
+{
+ int ret = 0;
+ s32 c1, c2;
+
+ for (;;) {
+ c1 = utf_to_upper(utf16_get(&s1));
+ c2 = utf_to_upper(utf16_get(&s2));
+ ret = c1 - c2;
+ if (ret || !c1 || c1 == -1 || c2 == -1)
+ break;
+ }
+ return ret;
+}
+
/*
* u16_strncmp() - compare two u16 string
*
--
2.37.2
