/* Arrange unibyte text at STR of NBYTES bytes as a multibyte text.
It actually converts only such 8-bit characters that don't construct
- a multibyte sequence to multibyte forms of Latin-1 characters. If
- NCHARS is nonzero, set *NCHARS to the number of characters in the
- text. It is assured that we can use LEN bytes at STR as a work
+ a multibyte sequence to multibyte forms of raw bytes. If NCHARS
+ is nonzero, set *NCHARS to the number of characters in the text.
+ It is assured that we can use LEN bytes at STR as a work
area and that is enough. Return the number of bytes of the
resulting text. */