#ifndef __CHARSET_H_
#define __CHARSET_H_
+#include <linux/kernel.h>
#include <linux/types.h>
#define MAX_UTF8_PER_UTF16 3
+/**
+ * console_read_unicode() - read Unicode code point from console
+ *
+ * @code: pointer to store Unicode code point
+ * Return: 0 = success
+ */
+int console_read_unicode(s32 *code);
+
+/**
+ * utf8_get() - get next UTF-8 code point from buffer
+ *
+ * @src: pointer to current byte, updated to point to next byte
+ * Return: code point, or 0 for end of string, or -1 if no legal
+ * code point is found. In case of an error src points to
+ * the incorrect byte.
+ */
+s32 utf8_get(const char **src);
+
+/**
+ * utf8_put() - write UTF-8 code point to buffer
+ *
+ * @code: code point
+ * @dst: pointer to destination buffer, updated to next position
+ * Return: -1 if the input parameters are invalid
+ */
+int utf8_put(s32 code, char **dst);
+
+/**
+ * utf8_utf16_strnlen() - length of a truncated utf-8 string after conversion
+ * to utf-16
+ *
+ * @src: utf-8 string
+ * @count: maximum number of code points to convert
+ * Return: length in bytes after conversion to utf-16 without the
+ * trailing \0. If an invalid UTF-8 sequence is hit one
+ * word will be reserved for a replacement character.
+ */
+size_t utf8_utf16_strnlen(const char *src, size_t count);
+
+/**
+ * utf8_utf16_strlen() - length of a utf-8 string after conversion to utf-16
+ *
+ * @src: utf-8 string
+ * Return: length in bytes after conversion to utf-16 without the
+ * trailing \0. -1 if the utf-8 string is not valid.
+ */
+#define utf8_utf16_strlen(a) utf8_utf16_strnlen((a), SIZE_MAX)
+
+/**
+ * utf8_utf16_strncpy() - copy utf-8 string to utf-16 string
+ *
+ * @dst: destination buffer
+ * @src: source buffer
+ * @count: maximum number of code points to copy
+ * Return: -1 if the input parameters are invalid
+ */
+int utf8_utf16_strncpy(u16 **dst, const char *src, size_t count);
+
+/**
+ * utf8_utf16_strcpy() - copy utf-8 string to utf-16 string
+ *
+ * @dst: destination buffer
+ * @src: source buffer
+ * Return: -1 if the input parameters are invalid
+ */
+#define utf8_utf16_strcpy(d, s) utf8_utf16_strncpy((d), (s), SIZE_MAX)
+
+/**
+ * utf16_get() - get next UTF-16 code point from buffer
+ *
+ * @src: pointer to current word, updated to point to next word
+ * Return: code point, or 0 for end of string, or -1 if no legal
+ * code point is found. In case of an error src points to
+ * the incorrect word.
+ */
+s32 utf16_get(const u16 **src);
+
+/**
+ * utf16_put() - write UTF-16 code point to buffer
+ *
+ * @code: code point
+ * @dst: pointer to destination buffer, updated to next position
+ * Return: -1 if the input parameters are invalid
+ */
+int utf16_put(s32 code, u16 **dst);
+
+/**
+ * utf16_strnlen() - length of a truncated utf-16 string
+ *
+ * @src: utf-16 string
+ * @count: maximum number of code points to convert
+ * Return: length in code points. If an invalid UTF-16 sequence is
+ * hit one position will be reserved for a replacement
+ * character.
+ */
+size_t utf16_strnlen(const u16 *src, size_t count);
+
+/**
+ * utf16_utf8_strnlen() - length of a truncated utf-16 string after conversion
+ * to utf-8
+ *
+ * @src: utf-16 string
+ * @count: maximum number of code points to convert
+ * Return: length in bytes after conversion to utf-8 without the
+ * trailing \0. If an invalid UTF-16 sequence is hit one
+ * byte will be reserved for a replacement character.
+ */
+size_t utf16_utf8_strnlen(const u16 *src, size_t count);
+
+/**
+ * utf16_utf8_strlen() - length of a utf-16 string after conversion to utf-8
+ *
+ * @src: utf-16 string
+ * Return: length in bytes after conversion to utf-8 without the
+ * trailing \0. -1 if the utf-16 string is not valid.
+ */
+#define utf16_utf8_strlen(a) utf16_utf8_strnlen((a), SIZE_MAX)
+
+/**
+ * utf16_utf8_strncpy() - copy utf-16 string to utf-8 string
+ *
+ * @dst: destination buffer
+ * @src: source buffer
+ * @count: maximum number of code points to copy
+ * Return: -1 if the input parameters are invalid
+ */
+int utf16_utf8_strncpy(char **dst, const u16 *src, size_t count);
+
+/**
+ * utf16_utf8_strcpy() - copy utf-16 string to utf-8 string
+ *
+ * @dst: destination buffer
+ * @src: source buffer
+ * Return: -1 if the input parameters are invalid
+ */
+#define utf16_utf8_strcpy(d, s) utf16_utf8_strncpy((d), (s), SIZE_MAX)
+
+/**
+ * utf_to_lower() - convert a Unicode letter to lower case
+ *
+ * @code: letter to convert
+ * Return: lower case letter or unchanged letter
+ */
+s32 utf_to_lower(const s32 code);
+
+/**
+ * utf_to_upper() - convert a Unicode letter to upper case
+ *
+ * @code: letter to convert
+ * Return: upper case letter or unchanged letter
+ */
+s32 utf_to_upper(const s32 code);
+
/**
* u16_strlen - count non-zero words
*
*/
size_t u16_strnlen(const u16 *in, size_t count);
-/**
- * utf16_strcpy() - UTF16 equivalent of strcpy()
- */
-uint16_t *utf16_strcpy(uint16_t *dest, const uint16_t *src);
-
-/**
- * utf16_strdup() - UTF16 equivalent of strdup()
- */
-uint16_t *utf16_strdup(const uint16_t *s);
-
/**
* utf16_to_utf8() - Convert an utf16 string to utf8
*
*/
uint8_t *utf16_to_utf8(uint8_t *dest, const uint16_t *src, size_t size);
-/**
- * utf8_to_utf16() - Convert an utf8 string to utf16
- *
- * Converts up to 'size' characters of the utf16 string 'src' to utf8
- * written to the 'dest' buffer. Stops at 0x00.
- *
- * @dest the destination buffer to write the utf8 characters
- * @src the source utf16 string
- * @size maximum number of utf16 characters to convert
- * @return the pointer to the first unwritten byte in 'dest'
- */
-uint16_t *utf8_to_utf16(uint16_t *dest, const uint8_t *src, size_t size);
-
#endif /* __CHARSET_H_ */