Documentation

Returns number of bytes in given character, minus 1. This function returns the number of bytes in a character that starts with the given byte, minus 1. I.e. for a single-byte character, it returns zero. For a double-byte character, it returns 1. And so on. Hence, this function returns a non-zero value if the given byte is the "lead byte" of a multibyte character. This function should not be confused with Windows API isleadbyte().