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RCOS C++ CRC for class tty

Name:

 tty

Comment:

 Like all good RCOS Device Drivers, tty is based on the abstract class - meaning tty's constructor must invoke port's constructor before it (itself) runs AND we must overload port's pure virtual function "RxPort" for receiving messages from the switcher (Kernel).

Collaborators:

Responsibilities:

 class tty : public port {
    char  *pVmem;                   // array of chars for "Video RAM"
    UINT16 uDest, uCnt;             // who wants 'em and how many they want
    UINT16 nBgnd, nFgnd;            // Background and Foreground colors
    INT16  nEscape;                 // > 0 while processing ANSI sequence
    INT16  n1, n2, ddy;             // Esc seq numerics and top pixel offset
    INT16  xcurr, ycurr;            // current location for output
    INT16  nRows, nCols;            // size of diasplay from x/y pixels
    INT16  x, y, dx, dy;            // origin and size of display area
    INT16  nMode, idx, jdx;         // current mode and index into video RAM
    INT16  AnsiDriver (char);       // interperate ANSI Escape sequences
    void   Reset (BOOL);            // Clear screen and input buffer
    void   Scroll (void);           // do conventional VDU scroll
    void   PutKey (char);           // process a user input key
    void   GetKey (PMSG);           // process a user request for data
    void   TtyCursor (UINT16);      // hide/display cursor
    void   Display (char*, INT16);  // display characters
    Rng    RngBuf;                  // Buffer chars from the "keyboard"
  public:
    tty (UINT16, UINT16, Knl*, rect&, UINT16, UINT16);
    ~tty (void);
    void   RxPort  (PMSG);          // supply virtual member of "port"
    INT16  SetMode (INT16);         // change mode, returning old mode
    void   ReFresh (BOOL = TRUE);   // force a full refresh of the display
    inline INT16 GetMode (void)     // return current terminal mode
      { return nMode; }
  };