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 qfilleos                                                              QWIKC
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 Function       Fills the screen with a character with an optional attribute
                change in a rows-by-columns block on the current screen
                starting at the EOS marker.
 Syntax         void qfilleos( unsigned char rows, unsigned char cols,
                               int attr, unsigned char ch );
 Remarks        The upper left corner of the block starts at the previously
                set EOS marker and the block size is rows by cols.  If
                SAMEATTR is used for attr, then the attribute will remain
                the same on the screen.  If rows or cols is zero, then
                nothing is written.
 Return value   None.
 Screens        All video pages and virtual screens.
 EOS            Updated.
 Restrictions   Stay within the screen limits.
 Example        To clear a 20 column data entry field at the EOS marker with
                yellow on magenta:

                  qfilleos( 1, 20, YELLOW+MAGENTA_BG, ' ' );