Provide a function for comparing UTF-16 strings in a case insensitive manner.
Signed-off-by: Heinrich Schuchardt heinrich.schuchardt@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 *