Description

   The iconv function converts characters in the buffer pointed
   to by inbuf to characters in another code set. The resulting
   characters are stored in the buffer pointed to by outbuf. The
   conversion type is specified by the conversion descriptor cd.
   This descriptor is returned from a successful call to iconv_open.

   If an invalid character is found in the input buffer, the
   conversion stops after the last successful conversion. The
   variable pointed to by inbytesleft is updated to reflect the
   number of bytes in the input buffer that are not converted. The
   variable pointed to by outbytesleft is updated to reflect the
   number of bytes remaining in the output buffer.