Add two functions to calculate UTF-16 string length. The address to
UTF-16 string could be unaligned, so use grub_get_unaligned16() to
iterate over characters.
Signed-off-by: Vitaly Kuzmichev <vitaly.kuzmic...@rtsoft.de>
---
include/grub/charset.h | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/include/grub/charset.h b/include/grub/charset.h
index 635d6df9e..099f23fbe 100644
--- a/include/grub/charset.h
+++ b/include/grub/charset.h
@@ -278,6 +278,32 @@ grub_utf16_to_utf8 (grub_uint8_t *dest, const
grub_uint16_t *src,
return dest;
}
+/* Returns the length of the UTF16 string, excluding \0. */
+static inline grub_size_t
+grub_utf16_strlen (const void *s)
+{
+ const grub_uint8_t *p = s;
+ grub_size_t len = 0;
+
+ while (grub_get_unaligned16 (p + 2 * len))
+ len++;
+
+ return len;
+}
+
+/* Returns the length of the UTF16 string of the fixed size, excluding \0. */
+static inline grub_size_t
+grub_utf16_strnlen (const void *s, grub_size_t maxlen)
+{
+ const grub_uint8_t *p = s;
+ grub_size_t len = 0;
+
+ while (grub_get_unaligned16 (p + 2 * len) && len < maxlen)
+ len++;
+
+ return len;
+}
+
#define GRUB_MAX_UTF8_PER_LATIN1 2
/* Convert Latin1 to UTF-8. */
--
2.34.1
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