109 /**

   110  * Retrieve the (partial) length of the previous UNICODE character

   111  * in an UTF-8 encoded string.

   112  * @param s char pointer pointing to the first char of the next character

   113  * @returns the decoded length in bytes (size) of the UNICODE character

   114  * that was just before the one where 's' is pointing to

   115  * @note If 's' is not pointing to the first byte of the next UNICODE character

   116  * only a partial length of the sequence will be returned.

   117  * For example given this sequence: 0xE3 0x85 0x80, 0xE3 0x81 0x9E

   118  * 1. 's' is pointing to the second 0xE3, return value is 3

   119  * 2. 's' is pointing to 0x80, return value is 2.

   120  * So take care with the return values of this function. To get the real length

   121  * for an (invalid) sequence, pass the string offset of this function's return

   122  * value to Utf8EncodedCharLen() or Utf8Decode()

   123  */

   124 static inline size_t Utf8PrevCharLen(const char *s)

   125 {

   126 	size_t len = 1;

   127 	while (IsUtf8Part(*--s)) len++;

   128 	return len;

   129 }

   130