From 7a9b366cd9b7c1c880fda82509054a06fbac208c Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Thu, 29 Dec 2022 14:44:03 +0100 Subject: lib: add function u16_strcasecmp() Provide a function for comparing UTF-16 strings in a case insensitive manner. Signed-off-by: Heinrich Schuchardt --- lib/charset.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'lib/charset.c') diff --git a/lib/charset.c b/lib/charset.c index bece4985bfc..b1842755eb1 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 * -- cgit v1.2.3