IMPLEMENTATION MODULE Shell;

   FROM SYSTEM IMPORT
      ADDRESS, ADR;
 
   IMPORT ASCII;
 
   FROM OS2DEF IMPORT
      HWND, HDC, HPS, RECTL, USHORT, NULL, ULONG;

   FROM Term IMPORT
      WM_TERM, WM_TERMQUIT,
      Dir, TermThrProc, InitTerm, PutKbdChar, PutPortChar;

   FROM PAD IMPORT
      WM_PAD, PAD_Quit, PAD_Error, DoPADMsg, Aborted, sFname, Send, Receive;

   FROM DataLink IMPORT
      WM_DL, DoDLMsg;
 
   FROM Screen IMPORT
      hvps, ColorSet, White, Green, Amber, Color1, Color2, ClrScr, WriteLn;
 
   FROM DosCalls IMPORT
      DosCreateThread, DosSuspendThread, DosResumeThread, DosSleep;

   FROM PMAVIO IMPORT
      VioCreatePS, VioAssociate, VioDestroyPS, VioShowPS, WinDefAVioWindowProc,
      FORMAT_CGA, HVPS;
 
   FROM PMWIN IMPORT
      MPARAM, MRESULT, SWP, PSWP,
      WS_VISIBLE, FCF_TITLEBAR, FCF_SIZEBORDER, FCF_SHELLPOSITION,
      WM_SYSCOMMAND, WM_MINMAXFRAME, SWP_MINIMIZE, HWND_DESKTOP,
      WM_PAINT, WM_QUIT, WM_COMMAND, WM_INITDLG, WM_CONTROL, WM_HELP,
      WM_INITMENU, WM_SIZE, WM_DESTROY, WM_CREATE, WM_CHAR,
      BM_SETCHECK, MBID_OK, MB_OK, MB_OKCANCEL,
      KC_CHAR, KC_CTRL, KC_VIRTUALKEY, KC_KEYUP,
      SWP_SIZE, SWP_MOVE, SWP_MAXIMIZE, SWP_RESTORE,
      MB_ICONQUESTION, MB_ICONASTERISK, MB_ICONEXCLAMATION,
      FID_MENU, MM_SETITEMATTR, MM_QUERYITEMATTR, MIA_DISABLED, MIA_CHECKED,
      WinCreateStdWindow, WinDestroyWindow,
      WinOpenWindowDC, WinSendMsg, WinQueryDlgItemText, WinInvalidateRect,
      WinDefWindowProc, WinBeginPaint, WinEndPaint, WinQueryWindowRect,
      WinSetWindowText, WinSetFocus, WinDlgBox, WinDefDlgProc, WinDismissDlg,
      WinMessageBox, WinPostMsg, WinWindowFromID, WinSendDlgItemMsg,
      WinSetWindowPos, WinSetActiveWindow;

   FROM PMGPI IMPORT
      GpiErase;

   FROM KH IMPORT
      IDM_KERMIT, IDM_FILE, IDM_OPTIONS, IDM_SENDFN, ID_SENDFN,
      IDM_DIR, IDM_CONNECT, IDM_SEND, IDM_REC, IDM_DIRPATH, ID_DIRPATH,
      IDM_DIREND, IDM_QUIT, IDM_ABOUT, IDM_HELPMENU, IDM_TERMHELP,
      IDM_COMPORT, IDM_BAUDRATE, IDM_DATABITS, IDM_STOPBITS, IDM_PARITY,
      COM_OFF, ID_COM1, ID_COM2, PARITY_OFF, ID_EVEN, ID_ODD, ID_NONE,
      DATA_OFF, ID_DATA7, ID_DATA8, STOP_OFF, ID_STOP1, ID_STOP2,
      BAUD_OFF, ID_B110, ID_B150, ID_B300, ID_B600, ID_B1200, ID_B2400,
      ID_B4800, ID_B9600, ID_B19K2,
      IDM_COLORS, IDM_WHITE, IDM_GREEN, IDM_AMBER, IDM_C1, IDM_C2;

   FROM CommPort IMPORT
      CommStatus, BaudRate, DataBits, StopBits, Parity, InitPort,
      StartReceiving, StopReceiving;
 
   FROM Strings IMPORT
      Assign, Append, AppendChar;
 
 
   CONST
      WM_SETMAX = 7000H;
      WM_SETFULL = 7001H;
      WM_SETRESTORE = 7002H;
      NONE = 0;   (* no port yet initialized *)
      STKSIZE = 4096;
      BUFSIZE = 4096;   (* Port receive buffers: room for two full screens *)
      PortError = "Port Is Already In Use -- EXIT? (Cancel Trys Another Port)";
      ESC = 33C;
 
 
   VAR
      FrameFlags : ULONG;
      TermStack : ARRAY [1..STKSIZE] OF CHAR;
      Stack : ARRAY [1..STKSIZE] OF CHAR;
      TermThr : CARDINAL;
      Thr : CARDINAL;
      hdc : HDC;
      frame_hvps, child_hvps : HVPS;
      TermMode : BOOLEAN;
      Path : ARRAY [0..60] OF CHAR;
      Banner : ARRAY [0..40] OF CHAR;
      PrevComPort : CARDINAL;
      Settings : ARRAY [0..1] OF RECORD
                                    baudrate : CARDINAL;
                                    databits : CARDINAL;
                                    parity : CARDINAL;
                                    stopbits : CARDINAL;
                                 END;
      MP1, MP2 : MPARAM;
 

   PROCEDURE SetFull;
   (* Changes window to full size *)
      BEGIN
         WinSetWindowPos (FrameWindow, 0,
            Pos.x + 3, Pos.y + 3, Pos.cx - 6, Pos.cy - 6,
            SWP_MOVE + SWP_SIZE);
      END SetFull;
 
 
   PROCEDURE SetRestore;
   (* Changes window to full size FROM maximized *)
      BEGIN
         WinSetWindowPos (FrameWindow, 0,
            Pos.x + 3, Pos.y + 3, Pos.cx - 6, Pos.cy - 6,
            SWP_MOVE + SWP_SIZE + SWP_RESTORE);
      END SetRestore;
 
 
   PROCEDURE SetMax;
   (* Changes window to maximized *)
      BEGIN
         WinSetWindowPos (FrameWindow, 0,
            Pos.x + 3, Pos.y + 3, Pos.cx - 6, Pos.cy - 6,
            SWP_MOVE + SWP_SIZE + SWP_MAXIMIZE);
      END SetMax;
 
 
   PROCEDURE SetBanner;
   (* Displays Abbreviated Program Title + Port Settings in Title Bar *)

      CONST
         PortName : ARRAY [0..1] OF ARRAY [0..5] OF CHAR =
            [["COM1:", 0C], ["COM2:", 0C]];
         BaudName : ARRAY [0..8] OF ARRAY [0..5] OF CHAR =
            [["110", 0C], ["150", 0C], ["300", 0C],
             ["600", 0C], ["1200", 0C], ["2400", 0C],
             ["4800", 0C], ["9600", 0C], ["19200", 0C]];
         ParityName : ARRAY [0..2] OF CHAR = ['E', 'O', 'N'];
 
      BEGIN
         WITH Settings[comport - COM_OFF] DO
            Assign (Class, Banner);
            Append (Banner, " -- ");
            Append (Banner, PortName[comport - COM_OFF]);
            Append (Banner, BaudName[baudrate - BAUD_OFF]);
            AppendChar (Banner, ',');
            AppendChar (Banner, ParityName[parity - PARITY_OFF]);
            AppendChar (Banner, ',');
            AppendChar (Banner, CHR ((databits - DATA_OFF) + 30H));
            AppendChar (Banner, ',');
            AppendChar (Banner, CHR ((stopbits - STOP_OFF) + 30H));
            WinSetWindowText (FrameWindow, ADR (Banner));
         END;
      END SetBanner;
 
 
   PROCEDURE SetPort;
   (* Sets The Communications Parameters Chosen By User *)

      VAR
         status : CommStatus;
         rc : USHORT;
 
      BEGIN
         IF PrevComPort # NONE THEN
            StopReceiving (PrevComPort - COM_OFF);
         END;
 
         WITH Settings[comport - COM_OFF] DO
            status := InitPort (
               comport - COM_OFF,
               BaudRate (baudrate - BAUD_OFF),
               DataBits (databits - DATA_OFF),
               StopBits (stopbits - STOP_OFF),
               Parity (parity - PARITY_OFF),
            );
         END;
 
         IF status = Success THEN
            StartReceiving (comport - COM_OFF, BUFSIZE);
            PrevComPort := comport;
         ELSE
            rc := WinMessageBox (HWND_DESKTOP, FrameWindow, ADR (PortError),
                                 0, 0, MB_OKCANCEL + MB_ICONEXCLAMATION);
            IF rc = MBID_OK THEN
               WinPostMsg (FrameWindow, WM_QUIT, MPARAM (0), MPARAM (0));
            ELSE   (* try the other port *)
               IF comport = ID_COM1 THEN
                  comport := ID_COM2;
               ELSE
                  comport := ID_COM1;
               END;
               SetPort;   (* recursive call for retry *)
            END;
         END;
         SetBanner;
      END SetPort;


   PROCEDURE MakeChild (msg : ARRAY OF CHAR);
   (* Creates a child window for use by send or receive threads *)
 
      VAR
         c_hdc : HDC;
 
      BEGIN
         WinPostMsg (FrameWindow, WM_SETFULL, MPARAM (0), MPARAM (0));
 
         Disable (IDM_CONNECT);
         Disable (IDM_SEND);
         Disable (IDM_REC);
         Disable (IDM_DIR);
         Disable (IDM_OPTIONS);
         Disable (IDM_COLORS);
 
         (* Create a client window *)
         FrameFlags := FCF_TITLEBAR + FCF_SIZEBORDER;
 
         ChildFrameWindow := WinCreateStdWindow (
				ClientWindow,        (* handle of the parent window *)
				WS_VISIBLE,          (* the window style *)
				FrameFlags,          (* the window flags *)
				ADR(Child),          (* the window class *)
				NULL,                (* the title bar text *)
				WS_VISIBLE,          (* client window style *)
				NULL,                (* handle of resource module *)
				IDM_KERMIT,          (* resource id *)
				ChildClientWindow    (* returned client window handle *)
         );
 
         WinSetWindowPos (ChildFrameWindow, 0,
            Pos.cx DIV 4, Pos.cy DIV 4,
            Pos.cx DIV 2, Pos.cy DIV 2 - 3,
            SWP_MOVE + SWP_SIZE);
 
         WinSetWindowText (ChildFrameWindow, ADR (msg));

         WinSetActiveWindow (HWND_DESKTOP, ChildFrameWindow);
 
         c_hdc := WinOpenWindowDC (ChildClientWindow);
         hvps := child_hvps;
         VioAssociate (c_hdc, hvps);
         ClrScr;	 (* clear the hvio window *)
      END MakeChild;
 

   PROCEDURE Disable (item : USHORT);
   (* Disables and "GREYS" a menu item *)
 
      VAR
         h : HWND;
 
      BEGIN
         h := WinWindowFromID (FrameWindow, FID_MENU);
         MP1.W1 := item;   MP1.W2 := 1;
         MP2.W1 := MIA_DISABLED;   MP2.W2 := MIA_DISABLED;
         WinSendMsg (h, MM_SETITEMATTR, MP1, MP2);
      END Disable;
 
 
   PROCEDURE Enable (item : USHORT);
   (* Enables a menu item *)
 
      VAR
         h : HWND;
         atr : USHORT;
 
      BEGIN
         h := WinWindowFromID (FrameWindow, FID_MENU);
         MP1.W1 := item;   MP1.W2 := 1;
         MP2.W1 := MIA_DISABLED;   MP2.W2 := MIA_DISABLED;
         atr := USHORT (WinSendMsg (h, MM_QUERYITEMATTR, MP1, MP2));
         atr := USHORT (BITSET (atr) * (BITSET (MIA_DISABLED) / BITSET (-1)));
         MP1.W1 := item;   MP1.W2 := 1;
         MP2.W1 := MIA_DISABLED;   MP2.W2 := atr;
         WinSendMsg (h, MM_SETITEMATTR, MP1, MP2);
      END Enable;
 
 
   PROCEDURE Check (item : USHORT);
   (* Checks a menu item -- indicates that it is selected *)
 
      VAR
         h : HWND;
 
      BEGIN
         h := WinWindowFromID (FrameWindow, FID_MENU);
         MP1.W1 := item;   MP1.W2 := 1;
         MP2.W1 := MIA_CHECKED;   MP2.W2 := MIA_CHECKED;
         WinSendMsg (h, MM_SETITEMATTR, MP1, MP2);
      END Check;
 
 
   PROCEDURE UnCheck (item : USHORT);
   (* Remove check from a menu item *)
 
      VAR
         h : HWND;
         atr : USHORT;
 
      BEGIN
         h := WinWindowFromID (FrameWindow, FID_MENU);
         MP1.W1 := item;   MP1.W2 := 1;
         MP2.W1 := MIA_CHECKED;   MP2.W2 := MIA_CHECKED;
         atr := USHORT (WinSendMsg (h, MM_QUERYITEMATTR, MP1, MP2));
         atr := USHORT (BITSET (atr) * (BITSET (MIA_CHECKED) / BITSET (-1)));
         MP1.W1 := item;   MP1.W2 := 1;
         MP2.W1 := MIA_CHECKED;   MP2.W2 := atr;
         WinSendMsg (h, MM_SETITEMATTR, MP1, MP2);
      END UnCheck;
 
 
   PROCEDURE DoMenu (hwnd : HWND; item [VALUE] : MPARAM);
   (* Processes Most Menu Interactions *)
 
      VAR
         rcl : RECTL;
         rc : USHORT;
 
      BEGIN
         CASE CARDINAL (item.W1) OF
            IDM_DIR:
               SetFull;
               WinQueryWindowRect (hwnd, rcl);
               WinDlgBox (HWND_DESKTOP, hwnd, PathDlgProc, 0, IDM_DIRPATH, 0);
               hvps := frame_hvps;
               VioAssociate (hdc, hvps);
               Dir (Path);
               WinDlgBox (HWND_DESKTOP, hwnd, DirEndDlgProc, 0, IDM_DIREND, 0);
               VioAssociate (0, hvps);
               WinInvalidateRect (hwnd, rcl, 0);
         |  IDM_CONNECT:
               TermMode := TRUE;
               Disable (IDM_CONNECT);
               Disable (IDM_SEND);
               Disable (IDM_REC);
               Disable (IDM_DIR);
               Disable (IDM_OPTIONS);
               Disable (IDM_COLORS);
               (* MAXIMIZE Window -- Required for Terminal Emulation *)
               SetMax;
               hvps := frame_hvps;
               VioAssociate (hdc, hvps);
               DosResumeThread (TermThr);
               InitTerm;
         |  IDM_SEND:
               WinDlgBox (HWND_DESKTOP, hwnd, SendFNDlgProc, 0, IDM_SENDFN, 0);
               MakeChild ("Send a File");
               DosCreateThread (Send, Thr, ADR (Stack[STKSIZE]));
         |  IDM_REC:
               MakeChild ("Receive a File");
               DosCreateThread (Receive, Thr, ADR (Stack[STKSIZE]));
         |  IDM_QUIT:
               rc := WinMessageBox (HWND_DESKTOP, ClientWindow,
                        ADR ("Do You Really Want To EXIT PCKermit?"),
                        ADR ("End Session"), 0, MB_OKCANCEL + MB_ICONQUESTION);
               IF rc = MBID_OK THEN
                  StopReceiving (comport - COM_OFF);
                  WinPostMsg (hwnd, WM_QUIT, MPARAM (0), MPARAM (0));
               END;
         |  IDM_COMPORT:
               WinDlgBox (HWND_DESKTOP, hwnd, ComDlgProc, 0, IDM_COMPORT, 0);
               SetPort;
         |  IDM_BAUDRATE:
               WinDlgBox (HWND_DESKTOP, hwnd, BaudDlgProc, 0, IDM_BAUDRATE, 0);
               SetPort;
         |  IDM_DATABITS:
               WinDlgBox (HWND_DESKTOP, hwnd, DataDlgProc, 0, IDM_DATABITS, 0);
               SetPort;
         |  IDM_STOPBITS:
               WinDlgBox (HWND_DESKTOP, hwnd, StopDlgProc, 0, IDM_STOPBITS, 0);
               SetPort;
         |  IDM_PARITY:
               WinDlgBox (HWND_DESKTOP, hwnd, ParityDlgProc, 0, IDM_PARITY, 0);
               SetPort;
         |  IDM_WHITE:
               UnCheck (ColorSet);
               ColorSet := IDM_WHITE;
               Check (ColorSet);
               White;
         |  IDM_GREEN:
               UnCheck (ColorSet);
               ColorSet := IDM_GREEN;
               Check (ColorSet);
               Green;
         |  IDM_AMBER:
               UnCheck (ColorSet);
               ColorSet := IDM_AMBER;
               Check (ColorSet);
               Amber;
         |  IDM_C1:
               UnCheck (ColorSet);
               ColorSet := IDM_C1;
               Check (ColorSet);
               Color1;
         |  IDM_C2:
               UnCheck (ColorSet);
               ColorSet := IDM_C2;
               Check (ColorSet);
               Color2;
         |  IDM_ABOUT:
               WinDlgBox (HWND_DESKTOP, hwnd, AboutDlgProc, 0, IDM_ABOUT, 0);
         ELSE
            (* Don't do anything... *)
         END;
      END DoMenu;


   PROCEDURE ComDlgProc ['ComDlgProc'] (
   (* Process Dialog Box for choosing COM1/COM2 *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         CASE msg OF
            WM_INITDLG:
               WinSendDlgItemMsg (hwnd, comport, BM_SETCHECK,
               MPARAM (1), MPARAM (0));
               WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, comport));
               RETURN 1;
         |  WM_CONTROL:
               comport := mp1.W1;
               RETURN 0;
         |  WM_COMMAND:
               WinDismissDlg (hwnd, 1);
               RETURN 0;
         ELSE
            RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
         END;
      END ComDlgProc;
 
 
   PROCEDURE BaudDlgProc ['BaudDlgProc'] (
   (* Process Dialog Box for choosing Baud Rate *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         WITH Settings[comport - COM_OFF] DO
            CASE msg OF
               WM_INITDLG:
                  WinSendDlgItemMsg (hwnd, baudrate, BM_SETCHECK,
                                       MPARAM (1), MPARAM (0));
                  WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, baudrate));
                  RETURN 1;
            |  WM_CONTROL:
                  baudrate := mp1.W1;
                  RETURN 0;
            |  WM_COMMAND:
                  WinDismissDlg (hwnd, 1);
                  RETURN 0;
            ELSE
               RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
            END;
         END;
      END BaudDlgProc;
 
 
   PROCEDURE DataDlgProc ['DataDlgProc'] (
   (* Process Dialog Box for choosing 7 or 8 data bits *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         WITH Settings[comport - COM_OFF] DO
            CASE msg OF
               WM_INITDLG:
                  WinSendDlgItemMsg (hwnd, databits, BM_SETCHECK,
                                       MPARAM (1), MPARAM (0));
                  WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, databits));
                  RETURN 1;
            |  WM_CONTROL:
                  databits := mp1.W1;
                  RETURN 0;
            |  WM_COMMAND:
                  WinDismissDlg (hwnd, 1);
                  RETURN 0;
            ELSE
               RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
            END;
         END;
      END DataDlgProc;
 
 
   PROCEDURE StopDlgProc ['StopDlgProc'] (
   (* Process Dialog Box for choosing 1 or 2 stop bits *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         WITH Settings[comport - COM_OFF] DO
            CASE msg OF
               WM_INITDLG:
                  WinSendDlgItemMsg (hwnd, stopbits, BM_SETCHECK,
                                 MPARAM (1), MPARAM (0));
                  WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, stopbits));
                  RETURN 1;
            |  WM_CONTROL:
                  stopbits := mp1.W1;
                  RETURN 0;
            |  WM_COMMAND:
                  WinDismissDlg (hwnd, 1);
                  RETURN 0;
            ELSE
               RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
            END;
         END;
      END StopDlgProc;
 
 
   PROCEDURE ParityDlgProc ['ParityDlgProc'] (
   (* Process Dialog Box for choosing odd, even, or no parity *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         WITH Settings[comport - COM_OFF] DO
            CASE msg OF
               WM_INITDLG:
                  WinSendDlgItemMsg (hwnd, parity, BM_SETCHECK,
                                       MPARAM (1), MPARAM (0));
                  WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, parity));
                  RETURN 1;
            |  WM_CONTROL:
                  parity := mp1.W1;
                  RETURN 0;
            |  WM_COMMAND:
                  WinDismissDlg (hwnd, 1);
                  RETURN 0;
            ELSE
               RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
            END;
         END;
      END ParityDlgProc;
 
 
   PROCEDURE AboutDlgProc ['AboutDlgProc'] (
   (* Process "About" Dialog Box *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         IF msg = WM_COMMAND THEN
            WinDismissDlg (hwnd, 1);
            RETURN 0;
         ELSE
            RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
         END;
      END AboutDlgProc;


   PROCEDURE SendFNDlgProc ['SendFNDlgProc'] (
   (* Process Dialog Box that obtains send filename from user *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         CASE msg OF
            WM_INITDLG:
               WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, ID_SENDFN));
               RETURN 1;
         |  WM_COMMAND:
               WinQueryDlgItemText (hwnd, ID_SENDFN, 20, ADR (sFname));
               WinDismissDlg (hwnd, 1);
               RETURN 0;
         ELSE
            RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
         END;
      END SendFNDlgProc;
 

   PROCEDURE PathDlgProc ['PathDlgProc'] (
   (* Process Dialog Box that obtains directory path from user *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         CASE msg OF
            WM_INITDLG:
               WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, ID_DIRPATH));
               RETURN 1;
         |  WM_COMMAND:
               WinQueryDlgItemText (hwnd, ID_DIRPATH, 60, ADR (Path));
               WinDismissDlg (hwnd, 1);
               RETURN 0;
         ELSE
            RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
         END;
      END PathDlgProc;


   PROCEDURE DirEndDlgProc ['DirEndDlgProc'] (
   (* Process Dialog Box to allow user to cancel directory *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         IF msg = WM_COMMAND THEN
            WinDismissDlg (hwnd, 1);
            RETURN 0;
         ELSE
            RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
         END;
      END DirEndDlgProc;
 
 
   PROCEDURE HelpDlgProc ['HelpDlgProc'] (
   (* Process Dialog Boxes for the HELP *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
      BEGIN
         IF msg = WM_COMMAND THEN
            WinDismissDlg (hwnd, 1);
            RETURN 0;
         ELSE
            RETURN WinDefDlgProc (hwnd, msg, mp1, mp2);
         END;
      END HelpDlgProc;


   PROCEDURE KeyTranslate (mp1, mp2 [VALUE] : MPARAM; VAR c1, c2 : CHAR) : BOOLEAN;
   (* Translates WM_CHAR message into ascii keystroke *)
 
      VAR
			code : CARDINAL;
			fs : BITSET;
			VK, KU, CH, CT : BOOLEAN;
 
      BEGIN
         fs := BITSET (mp1.W1);	 (* flags *)
         VK := (fs * BITSET (KC_VIRTUALKEY)) # {};
         KU := (fs * BITSET (KC_KEYUP)) # {};
         CH := (fs * BITSET (KC_CHAR)) # {};
         CT := (fs * BITSET (KC_CTRL)) # {};
         IF (NOT KU) THEN
            code := mp2.W1;	(* character code *)
            c1 := CHR (code);
            c2 := CHR (code DIV 256);
            IF ORD (c1) = 0E0H THEN	  (* function *)
               c1 := 0C;
            END;
            IF CT AND (NOT CH) AND (NOT VK) AND (code # 0) THEN
               c1 := CHR (CARDINAL ((BITSET (ORD (c1)) * BITSET (1FH))));
            END;
            RETURN TRUE;
         ELSE
            RETURN FALSE;
         END;
      END KeyTranslate;
 
 
   PROCEDURE WindowProc ['WindowProc'] (
   (* Main Window Procedure -- Handles message from PM and elsewhere *)
         hwnd  : HWND;
         msg   : USHORT;
         mp1   [VALUE] : MPARAM;
         mp2   [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];

      VAR
         ch : CHAR;
         hps       : HPS;
         pswp      : PSWP;
         c1, c2    : CHAR;
         NullRectl [0:0] : RECTL;
 
      BEGIN
         CASE msg OF
            WM_HELP:
               IF TermMode THEN
                  WinDlgBox (HWND_DESKTOP, hwnd, HelpDlgProc,
                             0, IDM_TERMHELP, 0);
               ELSE
                  WinDlgBox (HWND_DESKTOP, hwnd, HelpDlgProc,
                             0, IDM_HELPMENU, 0);
               END;
               RETURN 0;
         |  WM_SETFULL:
               SetFull;
               RETURN 0;
         |  WM_SETRESTORE:
               SetRestore;
               RETURN 0;
         |  WM_SETMAX:
               SetMax;
               RETURN 0;
         |  WM_MINMAXFRAME:
               pswp := PSWP (mp1);
               IF BITSET (pswp^.fs) * BITSET (SWP_MINIMIZE) # {} THEN
                  (* Don't Display Port Settings While Minimized *)
                  WinSetWindowText (FrameWindow, ADR (Title));
               ELSE
                  WinSetWindowText (FrameWindow, ADR (Banner));
                  IF TermMode AND
                   (BITSET (pswp^.fs) * BITSET (SWP_RESTORE) # {}) THEN
                     (* Force window to be maximized in terminal mode *)
 
                     WinPostMsg (FrameWindow, WM_SETMAX,
                                 MPARAM (0), MPARAM (0));
                  ELSIF (NOT TermMode) AND
                   (BITSET (pswp^.fs) * BITSET (SWP_MAXIMIZE) # {}) THEN
                     (* Prevent maximized window EXCEPT in terminal mode *)
                     WinPostMsg (FrameWindow, WM_SETRESTORE,
                                 MPARAM (0), MPARAM (0));
                  ELSE
                     (* Do Nothing *)
                  END;
               END;
               RETURN WinDefWindowProc (hwnd, msg, mp1, mp2);
         |  WM_CREATE:
               hdc := WinOpenWindowDC (hwnd);
               VioCreatePS (frame_hvps, 25, 80, 0, FORMAT_CGA, 0);
               VioCreatePS (child_hvps, 16, 40, 0, FORMAT_CGA, 0);
               DosCreateThread (TermThrProc, TermThr, ADR (TermStack[STKSIZE]));
               DosSuspendThread (TermThr);
               RETURN 0;
         |  WM_INITMENU:
               Check (ColorSet);
               RETURN 0;
         |  WM_COMMAND:
               DoMenu (hwnd, mp1);
               RETURN 0;
         |  WM_TERMQUIT:
               TermMode := FALSE;
               DosSuspendThread (TermThr);
               VioAssociate (0, hvps);
               (* Restore The Window *)
               SetRestore;
               Enable (IDM_CONNECT);
               Enable (IDM_SEND);
               Enable (IDM_REC);
               Enable (IDM_DIR);
               Enable (IDM_OPTIONS);
               Enable (IDM_COLORS);
               RETURN 0;
         |  WM_TERM:
               PutPortChar (CHR (mp1.W1));   (* To Screen *)
               RETURN 0;
         |  WM_CHAR:
               IF TermMode THEN
                  IF KeyTranslate (mp1, mp2, c1, c2) THEN
                     PutKbdChar (c1, c2);   (* To Port *)
                     RETURN 0;
                  ELSE
                     RETURN WinDefAVioWindowProc (hwnd, msg, mp1, mp2);
                  END;
               ELSE
                  RETURN WinDefWindowProc (hwnd, msg, mp1, mp2);
               END;
         |  WM_PAINT:
               hps := WinBeginPaint (hwnd, NULL, NullRectl);
               GpiErase (hps);
               VioShowPS (25, 80, 0, hvps);
               WinEndPaint (hps);
               RETURN 0;
         |  WM_SIZE:
               IF TermMode THEN
                  RETURN WinDefAVioWindowProc (hwnd, msg, mp1, mp2);
               ELSE
                  RETURN WinDefWindowProc (hwnd, msg, mp1, mp2);
               END;
         |  WM_DESTROY:
               VioDestroyPS (frame_hvps);
               VioDestroyPS (child_hvps);
               RETURN 0;
         ELSE
            RETURN WinDefWindowProc (hwnd, msg, mp1, mp2);
         END;
      END WindowProc;
 

   PROCEDURE ChildWindowProc ['ChildWindowProc'] (
   (* Window Procedure for Send/Receive child windows *)
      hwnd : HWND;
      msg  : USHORT;
      mp1  [VALUE] : MPARAM;
      mp2  [VALUE] : MPARAM) : MRESULT [LONG, WINDOWS];
 
      VAR
         mp : USHORT;
         hps : HPS;
         c1, c2 : CHAR;
         NullRectl [0:0] : RECTL;
 
      BEGIN
         CASE msg OF
            WM_PAINT:
               hps := WinBeginPaint (hwnd, NULL, NullRectl);
               GpiErase (hps);
               VioShowPS (16, 40, 0, hvps);
               WinEndPaint (hps);
               RETURN 0;
         |  WM_CHAR:
               IF KeyTranslate (mp1, mp2, c1, c2) AND (c1 = ESC) THEN
                  Aborted := TRUE;
                  RETURN 0;
               ELSE
                  RETURN WinDefWindowProc (hwnd, msg, mp1, mp2);
               END;
         |  WM_PAD:
               mp := mp1.W1;
               IF (mp = PAD_Error) OR (mp = PAD_Quit) THEN
                  WriteLn;
                  IF mp = PAD_Error THEN
                     WinMessageBox (HWND_DESKTOP, hwnd,
                                    ADR ("File Transfer Aborted"),
                                    ADR (Class), 0, MB_OK + MB_ICONEXCLAMATION);
                  ELSE
                     WinMessageBox (HWND_DESKTOP, hwnd,
                                       ADR ("File Transfer Completed"),
                                       ADR (Class), 0, MB_OK + MB_ICONASTERISK);
                  END;
                  DosSleep (2000);
                  VioAssociate (0, hvps);
                  WinDestroyWindow(ChildFrameWindow);
                  Enable (IDM_CONNECT);
                  Enable (IDM_SEND);
                  Enable (IDM_REC);
                  Enable (IDM_DIR);
                  Enable (IDM_OPTIONS);
                  Enable (IDM_COLORS);
               ELSE
                  DoPADMsg (mp1, mp2);
               END;
               RETURN 0;
         |  WM_DL:
               DoDLMsg (mp1, mp2);
               RETURN 0;
         |  WM_SIZE:
               WinSetWindowPos (ChildFrameWindow, 0,
                  Pos.cx DIV 4, Pos.cy DIV 4,
                  Pos.cx DIV 2, Pos.cy DIV 2 - 3,
                  SWP_MOVE + SWP_SIZE);
               RETURN WinDefAVioWindowProc (hwnd, msg, mp1, mp2);
         ELSE
            RETURN WinDefWindowProc (hwnd, msg, mp1, mp2);
         END;
      END ChildWindowProc;


BEGIN   (* Module Initialization *)
    WITH Settings[ID_COM1 - COM_OFF] DO
       baudrate := ID_B1200;
       parity := ID_EVEN;
       databits := ID_DATA7;
       stopbits := ID_STOP1;
    END;
 
    WITH Settings[ID_COM2 - COM_OFF] DO
       baudrate := ID_B19K2;
       parity := ID_EVEN;
       databits := ID_DATA7;
       stopbits := ID_STOP1;
    END;
    PrevComPort := NONE;
    comport := ID_COM1;
    TermMode := FALSE;   (* Not Initially in Terminal Emulation Mode *)
END Shell.