- The conversion descriptor is passed as CD. Both the "from" and the "to"
- encoding must use a single NUL byte at the end of the string (i.e. not
- UCS-2, UCS-4, UTF-16, UTF-32).
+ CD is the conversion descriptor from FROMCODE to TOCODE, or (iconv_t)(-1) if
+ the system does not support a direct conversion from FROMCODE to TOCODE.
+ Both the "from" and the "to" encoding must use a single NUL byte at the end
+ of the string (i.e. not UCS-2, UCS-4, UTF-16, UTF-32).