KERMIT FOR OS/2: PART I
The learning curve for OS/2 may be steep, but it's worth the price
Brian R. Anderson
Brian is an instructor of computer systems technology at the British Columbia Institute of Technology. He can be reached at 3700 Willingdon Ave., Burnaby, B.C., Canada V5G 3H2.
I am one of the many DOS curmudgeons who eschewed OS/2 since its introduction three years ago. Too expensive, said I. Too slow. Requires too much memory. Why does one user need multiple tasks? Why is protected memory necessary on a single-user system? In retrospect, this seems to be a case of sour grapes: I could not afford to upgrade my personal computer to allow me to run OS/2.
I recently purchased a new machine with a 33-MHz 80386, a VGA monitor, and a fast 150-Mbyte hard drive. Everything looks very different from this new perspective. Sure, OS/2 has much more overhead than DOS, but at 33 MHz, you don't really notice. Sure, 4 Mbytes is a lot of memory, but the price of RAM has declined significantly. Multitasking really does make sense -- never having to wait for the machine to finish one task before I can start another increases productivity. And, finally, while developing new software, protection from your own errant programs is a real advantage -- it virtually eliminates having to reboot because of system crashes. So with that confession and recantation out of the way, let's talk project:
Kermit is a file-transfer protocol that allows diverse computers to communicate. In May 1989, my article "Kermit Meets Modula-2" (also here in DDJ) described the PCKermit protocol and my implementation in Modula-2. This article describes how I ported PCKermit over to the OS/2 Presentation Manager (PM).
OS/2 Mini-Primer
OS/2 and PM are very large systems. The OS/2 kernel has over 250 functions; PM has over 500. This collection of functions is referred to as the Application Program Interface, or API. The Kernel API provides all of the traditional operating system services, including memory management, process control, and input/output. Using only the Kernel API, a programmer can write sophisticated character-based programs without ever having to resort to direct access to the hardware (as was often required under DOS).
The Kernel API is divided into four sections: Dos, Kbd, Mou, and Vio. The Kbd, Mou, and Vio provide fast, flexible access to the keyboard, mouse, and video systems, respectively, and are used mainly in traditional character-based applications. Presentation Manager takes control of the keyboard and mouse, so the Kbd and Mou group of functions is not used in a PM application. PM has many options available for controlling the screen; graphics support (both vector and raster) is available, as is support for various proportional and non-proportional fonts. The Vio group of functions, in a slightly altered form called "Advanced Vio" (AVio) is also available to a PM application. (My implementation of Kermit uses AVio functions to emulate a standard video display terminal (VDT) and thereby allows interaction with mainframe computers.) The DOS portion of the OS/2 kernel provides for disk I/O, task management, and memory management for both character-based and PM applications.
The Presentation Manager API is also divided into sections: Dev, Gpi, and Win. The functions in the Dev group are used to access PM device drivers, which allows for device-independent graphics. The Gpi group provides the drawing routines (lines, curves, bitmaps, fonts, and so on) for PM. The Win functions manage the PM windows including menus, scroll bars, and dialog boxes. Each Win function is quite "low level," which often makes for convoluted code (several functions, each with many parameters, must be called to accomplish some small task).
Besides the function libraries just described, PM makes use of resource files to store application-specific information about menus, dialog boxes, and so on. A resource file is a text file of source code that describes, for example, the form of a pull-down menu. The resources are compiled (with a resource compiler), and eventually linked to the application. The source code for many types of resources can be either developed manually or generated automatically using a dialog editor, for example.
On the Workbench
To develop programs for OS/2 and PM you will need a fairly extensive (and expensive) set of tools. Probably the most important "tool" is the documentation. The Microsoft OS/2 Programmers's Reference (volumes 1-3) is essential. There is also a fourth volume which covers OS/2 v1.2; that volume has remained on my shelf because I am running OS/2 v1.1. Because the Microsoft manuals are a bit light on examples, you will also want to get Charles Petzold's Programming the OS/2 Presentation Manager (Microsoft Press, 1989), and either Ray Duncan's Advanced OS/2 Programming (Microsoft Press, 1989) or Peter Norton and Robert LaFore's Inside OS/2 (Brady Books, 1988) on the kernel. Gordon Letwin's Inside OS/2 (Microsoft Press, 1988) is also a good overall OS/2 primer. For setting up and running (not programming) OS/2, you might consider Using OS/2 by Halliday, Minasi, and Gobel (Que Books, 1989).
Of course, you will need a compiler or assembler that supports OS/2 and PM. Many of the Microsoft products obviously qualify. And other compilers are starting to support OS/2 and PM. Whatever language you choose to use, you will need at least the ability to read C code -- all of the Microsoft documentation is written in C.
For this project, I used Stony Brook Modula-2, in part because my original implementation of Kermit was written in Modula-2 (albeit using the Logitech compiler), and in part because I prefer Modula-2 to C. The Stony Brook compiler proved an excellent choice; although much of the system was still in beta test, I found only one problem (which I was able to correct easily because I had the source code for the offending module).
Finally, you will need the resource set: Icon editor, dialog editor, font editor, resource compiler, and a few other miscellaneous tools. All of these tools are available from Microsoft as the OS/2 Softset. Alternately, you can purchase the OS/2 PM Software Development Kit which includes the Microsoft documentation, Petzold's book, and the tools (but no compiler). While purchasing the books and tools separately seems to be more economical, the SDK includes example code and useful programs (for example, PMCAP -- a screen capture utility) that are not included with the Softset.
Format of a PM Program
Most GUIs (that is, GEM, Windows, Macintosh, and OS/2-PM) have a very similar structure:
- 1. The main program sits in a loop fetching messages from the operating system and dispatching those messages to a window procedure.
- 2. The window procedure intercepts the messages (usually with a very long CASE statement) and processes the messages, often by calling other functions.
- 3. Any other part of the program that wants to get anything done must communicate with the window procedure by posting messages (which the main fetches and dispatches: see steps 1 and 2).
Virtually everything is done with messages. For example, a PM program never calls a function such as getchar( ) or Read( ) to get a character from the keyboard. Instead, a program must continually look for a WM_CHAR message, and then translate the parameters that come along with the message to find out what key has been struck.
One tremendous advantage with OS/2 (compared to the other GUIs) is that preemptive multitasking allows independent threads to execute in the background and post messages to the main window (to let the user know what is going on). PCKermit makes use of multiple threads for terminal emulation (connecting to the host), as well as for sending and receiving files.
Down to Business
The main program module, PCKERMIT.MOD (see Listing One, page 109), begins on line 1. (Note that the listings are sequentially numbered for easy reference.) PCKermit initializes the window system and message queue, registers two window classes (for the main window and a child window -- the child window is used during file transfer), creates and resizes the main window, and then sits in the message loop waiting for termination.
PCKermit is fairly traditional (for PM), except that after creating the main window, PCKermit immediately determines the size and position of the desktop (see line 99), records this in the global variable Pos, and then expands the window to nearly full size (line 100-102). The variable Pos is used again in the Shell module to ensure that the window is always correctly sized and positioned. The window is either sized to three device units smaller than the desktop (during file transfer), or is maximized (during terminal emulation). When the window is maximized or restored from maximum (by calling the WinSetWindowPos function again), an extra term must be included in the final parameter: Either SWP_RESTORE (line 543-544) or SWP_MAXIMIZE (line 552-554). A similar strategy is used to keep the child window properly sized (the child window is used for displaying status messages during file transfer).
SHELL.DEF (Listing Two, page 109) and SHELL.MOD (Listing Nine, Page 111) represent the most important module, as it is where all messages are processed (mostly in WindowProc, DoMenu, and ChildWindowProc). Several global variables and constants are defined here (that is, Class and ClientWindow). Besides the two window procedures, there are a number of ancillary procedures for controlling the windows: SetFull, SetRestore, and SetMaximize control the size of the window (PCKermit "insists" on a full window to properly emulate the TVI950 video screen); Enable and Disable "gray out" any menu item that is not currently accessible; Check and Uncheck indicate the currently selected video color scheme; DoMenu is called from WindowProc to process WM_COMMAND messages (these are mainly commands that result from the user interacting with menus); several dialog procedures (for example, BaudDlgProc) allow the user to make choices via pop-up dialog boxes (each dialog box is a window, and therefore needs its own window procedure); KeyTranslate processes keyboard messages and translates them into standard codes (for use by the Term module).
The window procedure, WindowProc (line 1088), is called only by PM. Its purpose is to process messages (including standard system messages such as WM_CREATE, WM_INITMENU, WM_COMMAND, and WM_PAINT, as well as PCKermit messages such as WM_SETFUL, WM_SETRESTORE, and WM_TERM). Besides the message itself (which is really just an integer), the window procedure is passed two message parameters (mp1 & mp2). The form of these two parameters depends upon the particular message. For example, in the case of the WM_TERM message, the message parameters are used to pass only a single character. In the case of the WM_CHAR message, the parameters contain a wide range of keyboard information (ASCII code, scan code, Control/Alt/Shift condition, time of keypress, and several flags). In some cases, the message parameters are not used at all.
One of the messages processed by WindowProc, WM_COMMAND, is passed on to DoMenu (line 743). This procedure processes all messages that result from the user clicking on a menu or using one of the accelerator keys. This user interaction often results in other child windows, called "dialog boxes," being created. When the dialog box is on the screen, another window procedure takes over. For example, if the user clicks on the Options menu, and then chooses baud rate ..., a dialog box (with radio buttons and an OK push button) appears on the screen. While this dialog box is on the screen, the BaudDlgProc (line 863), takes over control of the window (until the user clicks on OK, or presses the Return or Esc key). Each of the dialog boxes or messages boxes (PCKermit has nine) has its own window procedure.
The child window procedure, ChildWindowProc (line 1203), is also called only by PM (as are all window procedures), and processes a variety of system and PCKermit messages. The WM_PAD and PM_DL messages are from the PAD (Packet Assembler Disassembler) and DataLink Modules, respectively, and are used mainly to allow these modules (which are running as independent threads) to keep the user informed: The message parameters indicate what message should be displayed on the screen.
When the user selects Send or Receive (either through the menus or via accelerator keys), a fairly complex chain of events is brought into play. In DoMenu at lines 776 or 780 the IDM_SEND or IDM_REC messages are recognized. In the case of IDM_SEND, a dialog box is invoked. The dialog box procedure SendFNDlgProc on line 983 allows the user to enter a filename; PM returns a pointer to the filename that the user enters.
In the case of either IDM_SEND or IDM_REC, the MakeChild procedure (line 630) is called next. This procedure first forces the main window to full size, then disables several menu items (because we don't want the user to try to change the baud rate halfway through a file transfer, line 639), next creates a standard window (line 649), sizes and positions the window (line 661), puts an appropriate message in the window (line 666), and finally makes the new child window the active window (line 668).
After the window is ready, we must set it up so that we can send messages. PCKermit uses the AVio for this, and lines 671-673 set up the hvps (Handle to Vio Presentation Space). Back in DoMenu, on lines 779 or 782, a new thread is created. OS/2 will then schedule that thread (which will either send or receive a file) on the next available time slice. The thread will terminate itself when file transfer is complete (or if five consecutive errors occur). Before the thread actually terminates itself (by calling DosExit), it sends messages to its window procedure to remove the window and restore the menus.
When the user selects Connect mode (either through menus or via keyboard accelerator), the IDM_CONNECT message is recognized (line 762). As in the case of Send and Receive, various menu items are disabled, and a presentation space is set up. Unlike Send and Receive, a new thread is not started, but an existing thread is resumed (line 774); the thread was set up during initialization (line 1145) and then immediately suspended (next line).
Next Time
If you've examined the listings up to this point, you'll notice that I haven't mentioned Listings Three through Eight. These are the definition (.DEF) files for the modules to be covered in Part II. Listing Three, (page 109) for example, is the .DEF file for the Term module which performs TVI950 terminal Emulation. Also note the definition of the Dirprocedure (line 176) in Listing Three. Besides displaying a directory, this function allows the user to log onto a different drive, or to change to a different directory. This feature is necessary in a Kermit program, as only a file name must be specified when sending (you cannot send a file based upon a complete path). Part II examines these issues in greater detail.
Screen.DEF (Listing Four, page 109) gives you a flavor of the Screen module to be presented in Part II, which performs low-level screen and video I/O using OS/2's VIO functions. And CommPort.DEF (Listing Seven, page 111) presents a module originally supplied by Stony Brook that I've enhanced by adding extra buffering, for instance, to get around an OS/2 limitation. Of course, I'll also examine some of the unexpected problems associated with porting PCKermit to OS/2. Until next time....
_KERMIT FOR OS/2_ by Brian R. Anderson
[LISTING ONE]<a name="01e4_000a">
MODULE PCKermit;
(**************************************************************************)
(* *)
(* PCKermit -- by Brian R. Anderson *)
(* Copyright (c) 1990 *)
(* *)
(* PCKermit is an implementation of the Kermit file transfer protocol *)
(* developed at Columbia University. This (OS/2 PM) version is a *)
(* port from the DOS version of Kermit that I wrote two years ago. *)
(* My original DOS version appeared in the May 1989 issue of DDJ. *)
(* *)
(* The current version includes emulation of the TVI950 Video Display *)
(* Terminal for interaction with IBM mainframes (through the IBM 7171). *)
(* *)
(**************************************************************************)
FROM SYSTEM IMPORT
ADR;
FROM OS2DEF IMPORT
HAB, HWND, HPS, NULL, ULONG;
FROM PMWIN IMPORT
MPFROM2SHORT, HMQ, QMSG, CS_SIZEREDRAW, WS_VISIBLE, FS_ICON,
FCF_TITLEBAR, FCF_SYSMENU, FCF_SIZEBORDER, FCF_MINMAX, FCF_ACCELTABLE,
FCF_SHELLPOSITION, FCF_TASKLIST, FCF_MENU, FCF_ICON,
SWP_MOVE, SWP_SIZE, SWP_MAXIMIZE,
HWND_DESKTOP, FID_SYSMENU, SC_CLOSE, MIA_DISABLED, MM_SETITEMATTR,
WinInitialize, WinCreateMsgQueue, WinGetMsg, WinDispatchMsg, WinSendMsg,
WinRegisterClass, WinCreateStdWindow, WinDestroyWindow, WinWindowFromID,
WinDestroyMsgQueue, WinTerminate, WinSetWindowText,
WinSetWindowPos, WinQueryWindowPos;
FROM KH IMPORT
IDM_KERMIT;
FROM Shell IMPORT
Class, Title, Child, WindowProc, ChildWindowProc,
FrameWindow, ClientWindow, SetPort, Pos;
CONST
QUEUE_SIZE = 1024; (* Large message queue for async events *)
VAR
AnchorBlock : HAB;
MessageQueue : HMQ;
Message : QMSG;
FrameFlags : ULONG;
hsys : HWND;
BEGIN (* main *)
AnchorBlock := WinInitialize(0);
IF AnchorBlock # 0 THEN
MessageQueue := WinCreateMsgQueue (AnchorBlock, QUEUE_SIZE);
IF MessageQueue # 0 THEN
(* Register the parent window class *)
WinRegisterClass (
AnchorBlock,
ADR (Class),
WindowProc,
CS_SIZEREDRAW, 0);
(* Register a child window class *)
WinRegisterClass (
AnchorBlock,
ADR (Child),
ChildWindowProc,
CS_SIZEREDRAW, 0);
(* Create a standard window *)
FrameFlags := FCF_TITLEBAR + FCF_MENU + FCF_MINMAX +
FCF_SYSMENU + FCF_SIZEBORDER + FCF_TASKLIST +
FCF_ICON + FCF_SHELLPOSITION + FCF_ACCELTABLE;
FrameWindow := WinCreateStdWindow (
HWND_DESKTOP, (* handle of the parent window *)
WS_VISIBLE + FS_ICON, (* the window style *)
FrameFlags, (* the window flags *)
ADR(Class), (* the window class *)
NULL, (* the title bar text *)
WS_VISIBLE, (* client window style *)
NULL, (* handle of resource module *)
IDM_KERMIT, (* resource id *)
ClientWindow (* returned client window handle *)
);
IF FrameWindow # 0 THEN
(* Disable the CLOSE item on the system menu *)
hsys := WinWindowFromID (FrameWindow, FID_SYSMENU);
WinSendMsg (hsys, MM_SETITEMATTR,
MPFROM2SHORT (SC_CLOSE, 1),
MPFROM2SHORT (MIA_DISABLED, MIA_DISABLED));
(* Expand Window to Nearly Full Size, And Display the Title *)
WinQueryWindowPos (HWND_DESKTOP, ADR (Pos));
WinSetWindowPos (FrameWindow, 0,
Pos.x + 3, Pos.y + 3, Pos.cx - 6, Pos.cy - 6,
SWP_MOVE + SWP_SIZE);
WinSetWindowText (FrameWindow, ADR (Title));
SetPort; (* Try to initialize communications port *)
WHILE WinGetMsg(AnchorBlock, Message, NULL, 0, 0) # 0 DO
WinDispatchMsg(AnchorBlock, Message);
END;
WinDestroyWindow(FrameWindow);
END;
WinDestroyMsgQueue(MessageQueue);
END;
WinTerminate(AnchorBlock);
END;
END PCKermit.
<a name="01e4_000b"><a name="01e4_000b">
<a name="01e4_000c">[LISTING TWO]<a name="01e4_000c">
DEFINITION MODULE Shell;
FROM OS2DEF IMPORT
USHORT, HWND;
FROM PMWIN IMPORT
MPARAM, MRESULT, SWP;
EXPORT QUALIFIED
Class, Child, Title, FrameWindow, ClientWindow,
ChildFrameWindow, ChildClientWindow, Pos, SetPort,
WindowProc, ChildWindowProc;
CONST
Class = "PCKermit";
Child ="Child";
Title = "PCKermit -- Microcomputer to Mainframe Communications";
VAR
FrameWindow : HWND;
ClientWindow : HWND;
ChildFrameWindow : HWND;
ChildClientWindow : HWND;
Pos : SWP; (* Screen Dimensions: position & size *)
comport : CARDINAL;
PROCEDURE SetPort;
PROCEDURE WindowProc ['WindowProc'] (
hwnd : HWND;
msg : USHORT;
mp1 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
PROCEDURE ChildWindowProc ['ChildWindowProc'] (
hwnd : HWND;
msg : USHORT;
mp1 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
END Shell.
<a name="01e4_000d"><a name="01e4_000d">
<a name="01e4_000e">[LISTING THREE]<a name="01e4_000e">
DEFINITION MODULE Term; (* TVI950 Terminal Emulation For Kermit *)
EXPORT QUALIFIED
WM_TERM, WM_TERMQUIT,
Dir, TermThrProc, InitTerm, PutKbdChar, PutPortChar;
CONST
WM_TERM = 4000H;
WM_TERMQUIT = 4001H;
PROCEDURE Dir (path : ARRAY OF CHAR);
(* Displays a directory *)
PROCEDURE TermThrProc;
(* Thread to get characters from port, put into buffer, send message *)
PROCEDURE InitTerm;
(* Clear Screen, Home Cursor, Get Ready For Terminal Emulation *)
PROCEDURE PutKbdChar (ch1, ch2 : CHAR);
(* Process a character received from the keyboard *)
PROCEDURE PutPortChar (ch : CHAR);
(* Process a character received from the port *)
END Term.
<a name="01e4_000f"><a name="01e4_000f">
<a name="01e4_0010">[LISTING FOUR]<a name="01e4_0010">
DEFINITION MODULE Screen;
(* Module to perform "low level" screen functions (via AVIO) *)
FROM PMAVIO IMPORT
HVPS;
EXPORT QUALIFIED
NORMAL, HIGHLIGHT, REVERSE, attribute, ColorSet, hvps,
White, Green, Amber, Color1, Color2,
ClrScr, ClrEol, GotoXY, GetXY,
Right, Left, Up, Down, Write, WriteLn, WriteString,
WriteInt, WriteHex, WriteAtt;
VAR
NORMAL : CARDINAL;
HIGHLIGHT : CARDINAL;
REVERSE : CARDINAL;
attribute : CARDINAL;
ColorSet : CARDINAL;
hvps : HVPS; (* presentation space used by screen module *)
PROCEDURE White;
(* Sets up colors: Monochrome White *)
PROCEDURE Green;
(* Sets up colors: Monochrome Green *)
PROCEDURE Amber;
(* Sets up colors: Monochrome Amber *)
PROCEDURE Color1;
(* Sets up colors: Blue, Red, Green *)
PROCEDURE Color2;
(* Sets up colors: Green, Magenta, Cyan *)
PROCEDURE ClrScr;
(* Clear the screen, and home the cursor *)
PROCEDURE ClrEol;
(* clear from the current cursor position to the end of the line *)
PROCEDURE Right;
(* move cursor to the right *)
PROCEDURE Left;
(* move cursor to the left *)
PROCEDURE Up;
(* move cursor up *)
PROCEDURE Down;
(* move cursor down *)
PROCEDURE GotoXY (col, row : CARDINAL);
(* position cursor at column, row *)
PROCEDURE GetXY (VAR col, row : CARDINAL);
(* determine current cursor position *)
PROCEDURE Write (c : CHAR);
(* Write a Character, Teletype Mode *)
PROCEDURE WriteString (str : ARRAY OF CHAR);
(* Write String, Teletype Mode *)
PROCEDURE WriteInt (n : INTEGER; s : CARDINAL);
(* Write Integer, Teletype Mode *)
PROCEDURE WriteHex (n, s : CARDINAL);
(* Write a Hexadecimal Number, Teletype Mode *)
PROCEDURE WriteLn;
(* Write <cr> <lf>, Teletype Mode *)
PROCEDURE WriteAtt (c : CHAR);
(* write character and attribute at cursor position *)
END Screen.
<a name="01e4_0011"><a name="01e4_0011">
<a name="01e4_0012">[LISTING FIVE]<a name="01e4_0012">
DEFINITION MODULE PAD; (* Packet Assembler/Disassembler for Kermit *)
FROM PMWIN IMPORT
MPARAM;
EXPORT QUALIFIED
WM_PAD, PAD_Quit, PAD_Error, PacketType, yourNPAD, yourPADC, yourEOL,
Aborted, sFname, Send, Receive, DoPADMsg;
CONST
WM_PAD = 5000H;
PAD_Quit = 0;
PAD_Error = 20;
TYPE
(* PacketType used in both PAD and DataLink modules *)
PacketType = ARRAY [1..100] OF CHAR;
VAR
(* yourNPAD, yourPADC, and yourEOL used in both PAD and DataLink *)
yourNPAD : CARDINAL; (* number of padding characters *)
yourPADC : CHAR; (* padding characters *)
yourEOL : CHAR; (* End Of Line -- terminator *)
sFname : ARRAY [0..20] OF CHAR;
Aborted : BOOLEAN;
PROCEDURE Send;
(* Sends a file after prompting for filename *)
PROCEDURE Receive;
(* Receives a file (or files) *)
PROCEDURE DoPADMsg (mp1, mp2 : MPARAM);
(* Output messages for Packet Assembler/Disassembler *)
END PAD.
<a name="01e4_0013"><a name="01e4_0013">
<a name="01e4_0014">[LISTING SIX]<a name="01e4_0014">
DEFINITION MODULE DataLink; (* Sends and Receives Packets for PCKermit *)
FROM PMWIN IMPORT
MPARAM;
FROM PAD IMPORT
PacketType;
EXPORT QUALIFIED
WM_DL, FlushUART, SendPacket, ReceivePacket, DoDLMsg;
CONST
WM_DL = 6000H;
PROCEDURE FlushUART;
(* ensure no characters left in UART holding registers *)
PROCEDURE SendPacket (s : PacketType);
(* Adds SOH and CheckSum to packet *)
PROCEDURE ReceivePacket (VAR r : PacketType) : BOOLEAN;
(* strips SOH and checksum -- returns status: TRUE= good packet *)
(* received; FALSE = timed out waiting for packet or checksum error *)
PROCEDURE DoDLMsg (mp1, mp2 : MPARAM);
(* Process DataLink Messages *)
END DataLink.
<a name="01e4_0015"><a name="01e4_0015">
<a name="01e4_0016">[LISTING SEVEN]<a name="01e4_0016">
(*************************************************************)
(* *)
(* Copyright (C) 1988, 1989 *)
(* by Stony Brook Software *)
(* *)
(* All rights reserved. *)
(* *)
(*************************************************************)
DEFINITION MODULE CommPort;
TYPE
CommStatus = (
Success,
InvalidPort,
InvalidParameter,
AlreadyReceiving,
NotReceiving,
NoCharacter,
FramingError,
OverrunError,
ParityError,
BufferOverflow,
TimeOut
);
BaudRate = (
Baud110,
Baud150,
Baud300,
Baud600,
Baud1200,
Baud2400,
Baud4800,
Baud9600,
Baud19200
);
DataBits = [7..8];
StopBits = [1..2];
Parity = (Even, Odd, None);
PROCEDURE InitPort(port : CARDINAL; speed : BaudRate; data : DataBits;
stop : StopBits; check : Parity) : CommStatus;
PROCEDURE StartReceiving(port, bufsize : CARDINAL) : CommStatus;
PROCEDURE StopReceiving(port : CARDINAL) : CommStatus;
PROCEDURE GetChar(port : CARDINAL; VAR ch : CHAR) : CommStatus;
PROCEDURE SendChar(port : CARDINAL; ch : CHAR; modem : BOOLEAN) : CommStatus;
END CommPort.
<a name="01e4_0017"><a name="01e4_0017">
<a name="01e4_0018">[LISTING EIGHT]<a name="01e4_0018">
DEFINITION MODULE Files; (* File I/O for Kermit *)
FROM FileSystem IMPORT
File;
EXPORT QUALIFIED
Status, FileType, Open, Create, CloseFile, Get, Put, DoWrite;
TYPE
Status = (Done, Error, EOF);
FileType = (Input, Output);
PROCEDURE Open (VAR f : File; name : ARRAY OF CHAR) : Status;
(* opens an existing file for reading, returns status *)
PROCEDURE Create (VAR f : File; name : ARRAY OF CHAR) : Status;
(* creates a new file for writing, returns status *)
PROCEDURE CloseFile (VAR f : File; Which : FileType) : Status;
(* closes a file after reading or writing *)
PROCEDURE Get (VAR f : File; VAR ch : CHAR) : Status;
(* Reads one character from the file, returns status *)
PROCEDURE Put (ch : CHAR);
(* Writes one character to the file buffer *)
PROCEDURE DoWrite (VAR f : File) : Status;
(* Writes buffer to disk only if nearly full *)
END Files.
<a name="01e4_0019"><a name="01e4_0019">
<a name="01e4_001a">[LISTING NINE]<a name="01e4_001a">
IMPLEMENTATION MODULE Shell;
FROM SYSTEM IMPORT
ADDRESS, ADR;
IMPORT ASCII;
FROM OS2DEF IMPORT
LOWORD, HIWORD, 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, MPFROM2SHORT,
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;
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, 0, 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, 0, 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);
WinSendMsg (h, MM_SETITEMATTR,
MPFROM2SHORT (item, 1),
MPFROM2SHORT (MIA_DISABLED, MIA_DISABLED));
END Disable;
PROCEDURE Enable (item : USHORT);
(* Enables a menu item *)
VAR
h : HWND;
atr : USHORT;
BEGIN
h := WinWindowFromID (FrameWindow, FID_MENU);
atr := USHORT (WinSendMsg (h, MM_QUERYITEMATTR,
MPFROM2SHORT (item, 1),
MPFROM2SHORT (MIA_DISABLED, MIA_DISABLED)));
atr := USHORT (BITSET (atr) * (BITSET (MIA_DISABLED) / BITSET (-1)));
WinSendMsg (h, MM_SETITEMATTR,
MPFROM2SHORT (item, 1),
MPFROM2SHORT (MIA_DISABLED, atr));
END Enable;
PROCEDURE Check (item : USHORT);
(* Checks a menu item -- indicates that it is selected *)
VAR
h : HWND;
BEGIN
h := WinWindowFromID (FrameWindow, FID_MENU);
WinSendMsg (h, MM_SETITEMATTR,
MPFROM2SHORT (item, 1),
MPFROM2SHORT (MIA_CHECKED, MIA_CHECKED));
END Check;
PROCEDURE UnCheck (item : USHORT);
(* Remove check from a menu item *)
VAR
h : HWND;
atr : USHORT;
BEGIN
h := WinWindowFromID (FrameWindow, FID_MENU);
atr := USHORT (WinSendMsg (h, MM_QUERYITEMATTR,
MPFROM2SHORT (item, 1),
MPFROM2SHORT (MIA_CHECKED, MIA_CHECKED)));
atr := USHORT (BITSET (atr) * (BITSET (MIA_CHECKED) / BITSET (-1)));
WinSendMsg (h, MM_SETITEMATTR,
MPFROM2SHORT (item, 1),
MPFROM2SHORT (MIA_CHECKED, atr));
END UnCheck;
PROCEDURE DoMenu (hwnd : HWND; item : MPARAM);
(* Processes Most Menu Interactions *)
VAR
rcl : RECTL;
rc : USHORT;
BEGIN
CASE LOWORD (item) 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, ADR (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, 0, 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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
BEGIN
CASE msg OF
WM_INITDLG:
WinSendDlgItemMsg (hwnd, comport, BM_SETCHECK, 1, 0);
WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, comport));
RETURN 1;
| WM_CONTROL:
comport := LOWORD (mp1);
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
BEGIN
WITH Settings[comport - COM_OFF] DO
CASE msg OF
WM_INITDLG:
WinSendDlgItemMsg (hwnd, baudrate, BM_SETCHECK, 1, 0);
WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, baudrate));
RETURN 1;
| WM_CONTROL:
baudrate := LOWORD (mp1);
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
BEGIN
WITH Settings[comport - COM_OFF] DO
CASE msg OF
WM_INITDLG:
WinSendDlgItemMsg (hwnd, databits, BM_SETCHECK, 1, 0);
WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, databits));
RETURN 1;
| WM_CONTROL:
databits := LOWORD (mp1);
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
BEGIN
WITH Settings[comport - COM_OFF] DO
CASE msg OF
WM_INITDLG:
WinSendDlgItemMsg (hwnd, stopbits, BM_SETCHECK, 1, 0);
WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, stopbits));
RETURN 1;
| WM_CONTROL:
stopbits := LOWORD (mp1);
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
BEGIN
WITH Settings[comport - COM_OFF] DO
CASE msg OF
WM_INITDLG:
WinSendDlgItemMsg (hwnd, parity, BM_SETCHECK, 1, 0);
WinSetFocus (HWND_DESKTOP, WinWindowFromID (hwnd, parity));
RETURN 1;
| WM_CONTROL:
parity := LOWORD (mp1);
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
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 : 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 (LOWORD (mp1)); (* 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 := LOWORD (mp2); (* 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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
VAR
ch : CHAR;
hps : HPS;
pswp : PSWP;
c1, c2 : CHAR;
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, 0, 0);
ELSIF (NOT TermMode) AND
(BITSET (pswp^.fs) * BITSET (SWP_MAXIMIZE) # {}) THEN
(* Prevent maximized window EXCEPT in terminal mode *)
WinPostMsg (FrameWindow, WM_SETRESTORE, 0, 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 (LOWORD (mp1))); (* 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, ADDRESS (NULL));
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 : MPARAM;
mp2 : MPARAM) : MRESULT [LONG, LOADDS];
VAR
mp : USHORT;
hps : HPS;
c1, c2 : CHAR;
BEGIN
CASE msg OF
WM_PAINT:
hps := WinBeginPaint (hwnd, NULL, ADDRESS (NULL));
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 := LOWORD (mp1);
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.
<a name="01e4_001b"><a name="01e4_001b">
<a name="01e4_001c">[LISTING TEN]<a name="01e4_001c">
IMPLEMENTATION MODULE Term; (* TVI950 Terminal Emulation for Kermit *)
FROM Drives IMPORT
SetDrive;
FROM Directories IMPORT
FileAttributes, AttributeSet, DirectoryEntry, FindFirst, FindNext;
FROM SYSTEM IMPORT
ADR;
FROM OS2DEF IMPORT
ULONG;
FROM DosCalls IMPORT
DosChDir, DosSleep;
FROM Screen IMPORT
ClrScr, ClrEol, GotoXY, GetXY,
Right, Left, Up, Down, WriteAtt, WriteString, WriteLn, Write,
attribute, NORMAL, HIGHLIGHT, REVERSE;
FROM PMWIN IMPORT
WinPostMsg, MPFROM2SHORT;
FROM Shell IMPORT
comport, FrameWindow;
FROM KH IMPORT
COM_OFF;
FROM CommPort IMPORT
CommStatus, GetChar, SendChar;
FROM Strings IMPORT
Length, Concat;
IMPORT ASCII;
CONST
(* Key codes: Note: F1 -- F12 are actually Shift-F1 -- Shift-F12 *)
F1 = 124C;
F2 = 125C;
F3 = 126C;
F4 = 127C;
F5 = 130C;
F6 = 131C;
F7 = 132C;
F8 = 133C;
F9 = 134C;
F10 = 135C;
F11 = 207C;
F12 = 210C;
AF1 = 213C; (* Alt-F1 *)
AF2 = 214C; (* Alt-F2 *)
INS = 122C;
DEL = 123C;
HOME = 107C;
PGDN = 121C; (* synonym for PF10 *)
PGUP = 111C; (* synonym for PF11 *)
ENDD = 117C; (* synonym for PF12 *)
UPARROW = 110C;
DOWNARROW = 120C;
LEFTARROW = 113C;
RIGHTARROW = 115C;
CtrlX = 30C;
CtrlCaret = 36C;
CtrlZ = 32C;
CtrlL = 14C;
CtrlH = 10C;
CtrlK = 13C;
CtrlJ = 12C;
CtrlV = 26C;
ESC = 33C;
BUFSIZE = 4096; (* character buffer used by term thread *)
VAR
commStat : CommStatus;
echo : (Off, Local, On);
newline: BOOLEAN; (* translate <cr> to <cr><lf> *)
Insert : BOOLEAN;
PROCEDURE Dir (path : ARRAY OF CHAR);
(* Change drive and/or directory; display a directory (in wide format) *)
VAR
gotFN : BOOLEAN;
filename : ARRAY [0..20] OF CHAR;
attr : AttributeSet;
ent : DirectoryEntry;
i, j, k : INTEGER;
BEGIN
filename := ""; (* in case no directory change *)
i := Length (path);
IF (i > 2) AND (path[1] = ':') THEN (* drive specifier *)
DEC (i, 2);
SetDrive (ORD (CAP (path[0])) - ORD ('A'));
FOR j := 0 TO i DO (* strip off the drive specifier *)
path[j] := path[j + 2];
END;
END;
IF i # 0 THEN
gotFN := FALSE;
WHILE (i >= 0) AND (path[i] # '\') DO
IF path[i] = '.' THEN
gotFN := TRUE;
END;
DEC (i);
END;
IF gotFN THEN
j := i + 1;
k := 0;
WHILE path[j] # 0C DO
filename[k] := path[j];
INC (k); INC (j);
END;
filename[k] := 0C;
IF (i = -1) OR ((i = 0) AND (path[0] = '\')) THEN
INC (i);
END;
path[i] := 0C;
END;
END;
IF Length (path) # 0 THEN
DosChDir (ADR (path), 0);
END;
IF Length (filename) = 0 THEN
filename := "*.*";
END;
attr := AttributeSet {ReadOnly, Directory, Archive};
i := 1; (* keep track of position on line *)
ClrScr;
gotFN := FindFirst (filename, attr, ent);
WHILE gotFN DO
WriteString (ent.name);
j := Length (ent.name);
WHILE j < 12 DO (* 12 is maximum length for "filename.typ" *)
Write (' ');
INC (j);
END;
INC (i); (* next position on this line *)
IF i > 5 THEN
i := 1; (* start again on new line *)
WriteLn;
ELSE
WriteString (" | ");
END;
gotFN := FindNext (ent);
END;
WriteLn;
END Dir;
PROCEDURE InitTerm;
(* Clear Screen, Home Cursor, Get Ready For Terminal Emulation *)
BEGIN
ClrScr;
Insert := FALSE;
attribute := NORMAL;
END InitTerm;
PROCEDURE PutKbdChar (ch1, ch2 : CHAR);
(* Process a character received from the keyboard *)
BEGIN
IF ch1 = ASCII.enq THEN (* Control-E *)
echo := On;
ELSIF ch1 = ASCII.ff THEN (* Control-L *)
echo := Local;
ELSIF ch1 = ASCII.dc4 THEN (* Control-T *)
echo := Off;
ELSIF ch1 = ASCII.so THEN (* Control-N *)
newline := TRUE;
ELSIF ch1 = ASCII.si THEN (* Control-O *)
newline := FALSE;
ELSIF (ch1 = ASCII.can) OR (ch1 = ESC) THEN
attribute := NORMAL;
WinPostMsg (FrameWindow, WM_TERMQUIT, 0, 0);
ELSIF ch1 = 0C THEN
Function (ch2);
ELSE
commStat := SendChar (comport - COM_OFF, ch1, FALSE);
IF (echo = On) OR (echo = Local) THEN
WriteAtt (ch1);
END;
END;
END PutKbdChar;
PROCEDURE Function (ch : CHAR);
(* handles the function keys -- including PF1 - PF12, etc. *)
BEGIN
CASE ch OF
F1 : commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, '@', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F2 : commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'A', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F3 : commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'B', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F4 : commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'C', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F5 : commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'D', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F6 : commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'E', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F7 : commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'F', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F8 : commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'G', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F9 : commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'H', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F10,
PGDN: commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'I', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F11,
AF1,
PGUP: commStat := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
commStat := SendChar (comport - COM_OFF, 'J', FALSE);
commStat := SendChar (comport - COM_OFF, ASCII.cr, FALSE);
| F12,
AF2,
ENDD: commStat := SendChar (comport - COM_OFF, ESC, FALSE);
commStat := SendChar (comport - COM_OFF, 'Q', FALSE);
| INS : IF NOT Insert THEN
commStat := SendChar (comport - COM_OFF, ESC, FALSE);
commStat := SendChar (comport - COM_OFF, 'E', FALSE);
END;
| DEL : commStat := SendChar (comport - COM_OFF, ESC, FALSE);
commStat := SendChar (comport - COM_OFF, 'R', FALSE);
| HOME : commStat := SendChar (comport - COM_OFF, CtrlZ, FALSE);
| UPARROW : commStat := SendChar (comport - COM_OFF, CtrlK, FALSE);
| DOWNARROW : commStat := SendChar (comport - COM_OFF, CtrlV, FALSE);
| LEFTARROW : commStat := SendChar (comport - COM_OFF, CtrlH, FALSE);
| RIGHTARROW : commStat := SendChar (comport - COM_OFF, CtrlL, FALSE);
ELSE
(* do nothing *)
END;
END Function;
PROCEDURE TermThrProc;
(* Thread to get characters from port, put into buffer *)
VAR
ch : CHAR;
BEGIN
LOOP
IF GetChar (comport - COM_OFF, ch) = Success THEN
WinPostMsg (FrameWindow, WM_TERM, MPFROM2SHORT (ORD (ch), 0), 0);
ELSE
DosSleep (0);
END
END;
END TermThrProc;
VAR
EscState, CurState1, CurState2 : BOOLEAN;
CurChar1 : CHAR;
PROCEDURE PutPortChar (ch : CHAR);
(* Process a character received from the port *)
BEGIN
IF EscState THEN
EscState := FALSE;
IF ch = '=' THEN
CurState1 := TRUE;
ELSE
Escape (ch);
END;
ELSIF CurState1 THEN
CurState1 := FALSE;
CurChar1 := ch;
CurState2 := TRUE;
ELSIF CurState2 THEN
CurState2 := FALSE;
Cursor (ch);
ELSE
CASE ch OF
CtrlCaret, CtrlZ : ClrScr;
| CtrlL : Right;
| CtrlH : Left;
| CtrlK : Up;
| CtrlJ : Down;
| ESC : EscState := TRUE;
ELSE
WriteAtt (ch);
IF newline AND (ch = ASCII.cr) THEN
WriteLn;
END;
END;
END;
IF echo = On THEN
commStat := SendChar (comport - COM_OFF, ch, FALSE);
END;
END PutPortChar;
PROCEDURE Escape (ch : CHAR);
(* handles escape sequences *)
BEGIN
CASE ch OF
'*' : ClrScr;
| 'T', 'R' : ClrEol;
| ')' : attribute := NORMAL;
| '(' : attribute := HIGHLIGHT;
| 'f' : InsertMsg;
| 'g' : InsertOn;
ELSE
(* ignore *)
END;
END Escape;
PROCEDURE Cursor (ch : CHAR);
(* handles cursor positioning *)
VAR
x, y : CARDINAL;
BEGIN
y := ORD (CurChar1) - 20H;
x := ORD (ch) - 20H;
GotoXY (x, y); (* adjust for HOME = (1, 1) *)
END Cursor;
VAR
cx, cy : CARDINAL;
PROCEDURE InsertMsg;
(* get ready insert mode -- place a message at the bottom of the screen *)
BEGIN
IF NOT Insert THEN
GetXY (cx, cy); (* record current position *)
GotoXY (1, 24);
ClrEol;
attribute := REVERSE;
ELSE (* exit Insert mode *)
GetXY (cx, cy);
GotoXY (1, 24);
ClrEol;
GotoXY (cx, cy);
Insert := FALSE;
END;
END InsertMsg;
PROCEDURE InsertOn;
(* enter insert mode -- after INSERT MODE message is printed *)
BEGIN
attribute := NORMAL;
GotoXY (cx, cy);
Insert := TRUE;
END InsertOn;
BEGIN (* module initialization *)
echo := Off;
newline := FALSE;
Insert := FALSE;
EscState := FALSE;
CurState1 := FALSE;
CurState2 := FALSE;
END Term.
<a name="01e4_001d"><a name="01e4_001d">
<a name="01e4_001e">[LISTING ELEVEN]<a name="01e4_001e">
IMPLEMENTATION MODULE Screen;
(* module to perform "low level" screen functions (via AVIO) *)
IMPORT ASCII;
FROM SYSTEM IMPORT
ADR;
FROM Strings IMPORT
Length;
FROM Conversions IMPORT
IntToString;
FROM KH IMPORT
IDM_GREEN;
FROM Vio IMPORT
VioSetCurPos, VioGetCurPos, VioScrollUp,
VioWrtNCell, VioWrtTTY, VioCell;
CONST
GREY = 07H;
WHITE = 0FH;
REV_GY = 70H;
GREEN = 02H;
LITE_GRN = 0AH;
REV_GRN = 20H;
AMBER = 06H;
LITE_AMB = 0EH;
REV_AMB = 60H;
RED = 0CH;
CY_BK = 0B0H;
CY_BL = 0B9H;
REV_RD = 0CFH;
REV_BL = 9FH;
MAGENTA = 05H;
VAR
(* From Definition Module
NORMAL : CARDINAL;
HIGHLIGHT : CARDINAL;
REVERSE : CARDINAL;
attribute : CARDINAL;
hvps : HVPS;
*)
x, y : CARDINAL;
bCell : VioCell;
PROCEDURE White;
(* Sets up colors: Monochrome White *)
BEGIN
NORMAL := GREY;
HIGHLIGHT := WHITE;
REVERSE := REV_GY;
attribute := NORMAL;
END White;
PROCEDURE Green;
(* Sets up colors: Monochrome Green *)
BEGIN
NORMAL := GREEN;
HIGHLIGHT := LITE_GRN;
REVERSE := REV_GRN;
attribute := NORMAL;
END Green;
PROCEDURE Amber;
(* Sets up colors: Monochrome Amber *)
BEGIN
NORMAL := AMBER;
HIGHLIGHT := LITE_AMB;
REVERSE := REV_AMB;
attribute := NORMAL;
END Amber;
PROCEDURE Color1;
(* Sets up colors: Blue, Red, Green *)
BEGIN
NORMAL := GREEN;
HIGHLIGHT := RED;
REVERSE := REV_BL;
attribute := NORMAL;
END Color1;
PROCEDURE Color2;
(* Sets up colors: Cyan Background; Black, Blue, White-on-Red *)
BEGIN
NORMAL := CY_BK;
HIGHLIGHT := CY_BL;
REVERSE := REV_RD;
attribute := NORMAL;
END Color2;
PROCEDURE HexToString (num : INTEGER;
size : CARDINAL;
VAR buf : ARRAY OF CHAR;
VAR I : CARDINAL;
VAR Done : BOOLEAN);
(* Local Procedure to convert a number to a string, represented in HEX *)
CONST
ZERO = 30H; (* ASCII code *)
A = 41H;
VAR
i : CARDINAL;
h : CARDINAL;
t : ARRAY [0..10] OF CHAR;
BEGIN
i := 0;
REPEAT
h := num MOD 16;
IF h <= 9 THEN
t[i] := CHR (h + ZERO);
ELSE
t[i] := CHR (h - 10 + A);
END;
INC (i);
num := num DIV 16;
UNTIL num = 0;
IF (size > HIGH (buf)) OR (i > HIGH (buf)) THEN
Done := FALSE;
RETURN;
ELSE
Done := TRUE;
END;
WHILE size > i DO
buf[I] := '0'; (* pad with zeros *)
DEC (size);
INC (I);
END;
WHILE i > 0 DO
DEC (i);
buf[I] := t[i];
INC (I);
END;
buf[I] := 0C;
END HexToString;
PROCEDURE ClrScr;
(* Clear the screen, and home the cursor *)
BEGIN
bCell.ch := ' '; (* space = blank screen *)
bCell.attr := CHR (NORMAL); (* Normal Video Attribute *)
VioScrollUp (0, 0, 24, 79, 25, bCell, hvps);
GotoXY (0, 0);
END ClrScr;
PROCEDURE ClrEol;
(* clear from the current cursor position to the end of the line *)
BEGIN
GetXY (x, y); (* current cursor position *)
bCell.ch := ' '; (* space = blank *)
bCell.attr := CHR (NORMAL); (* Normal Video Attribute *)
VioScrollUp (y, x, y, 79, 1, bCell, hvps);
END ClrEol;
PROCEDURE Right;
(* move cursor to the right *)
BEGIN
GetXY (x, y);
INC (x);
GotoXY (x, y);
END Right;
PROCEDURE Left;
(* move cursor to the left *)
BEGIN
GetXY (x, y);
DEC (x);
GotoXY (x, y);
END Left;
PROCEDURE Up;
(* move cursor up *)
BEGIN
GetXY (x, y);
DEC (y);
GotoXY (x, y);
END Up;
PROCEDURE Down;
(* move cursor down *)
BEGIN
GetXY (x, y);
INC (y);
GotoXY (x, y);
END Down;
PROCEDURE GotoXY (col, row : CARDINAL);
(* position cursor at column, row *)
BEGIN
IF (col <= 79) AND (row <= 24) THEN
VioSetCurPos (row, col, hvps);
END;
END GotoXY;
PROCEDURE GetXY (VAR col, row : CARDINAL);
(* determine current cursor position *)
BEGIN
VioGetCurPos (row, col, hvps);
END GetXY;
PROCEDURE Write (c : CHAR);
(* Write a Character *)
BEGIN
WriteAtt (c);
END Write;
PROCEDURE WriteString (str : ARRAY OF CHAR);
(* Write String *)
VAR
i : CARDINAL;
c : CHAR;
BEGIN
i := 0;
c := str[i];
WHILE c # 0C DO
Write (c);
INC (i);
c := str[i];
END;
END WriteString;
PROCEDURE WriteInt (n : INTEGER; s : CARDINAL);
(* Write Integer *)
VAR
i : CARDINAL;
b : BOOLEAN;
str : ARRAY [0..6] OF CHAR;
BEGIN
i := 0;
IntToString (n, s, str, i, b);
WriteString (str);
END WriteInt;
PROCEDURE WriteHex (n, s : CARDINAL);
(* Write a Hexadecimal Number *)
VAR
i : CARDINAL;
b : BOOLEAN;
str : ARRAY [0..6] OF CHAR;
BEGIN
i := 0;
HexToString (n, s, str, i, b);
WriteString (str);
END WriteHex;
PROCEDURE WriteLn;
(* Write <cr> <lf> *)
BEGIN
Write (ASCII.cr); Write (ASCII.lf);
END WriteLn;
PROCEDURE WriteAtt (c : CHAR);
(* write character and attribute at cursor position *)
VAR
s : ARRAY [0..1] OF CHAR;
BEGIN
GetXY (x, y);
IF (c = ASCII.ht) THEN
bCell.ch := ' ';
bCell.attr := CHR (attribute);
REPEAT
VioWrtNCell (bCell, 1, y, x, hvps);
Right;
UNTIL (x MOD 8) = 0;
ELSIF (c = ASCII.cr) OR (c = ASCII.lf)
OR (c = ASCII.bel) OR (c = ASCII.bs) THEN
s[0] := c; s[1] := 0C;
VioWrtTTY (ADR (s), 1, hvps);
IF c = ASCII.lf THEN
ClrEol;
END;
ELSE
bCell.ch := c;
bCell.attr := CHR (attribute);
VioWrtNCell (bCell, 1, y, x, hvps);
Right;
END;
END WriteAtt;
BEGIN (* module initialization *)
ColorSet := IDM_GREEN;
NORMAL := GREEN;
HIGHLIGHT := LITE_GRN;
REVERSE := REV_GRN;
attribute := NORMAL;
END Screen.
<a name="01e4_001f"><a name="01e4_001f">
<a name="01e4_0020">[LISTING TWELVE]<a name="01e4_0020">
(**************************************************************************)
(* *)
(* Copyright (c) 1988, 1989 *)
(* by Stony Brook Software *)
(* and *)
(* Copyright (c) 1990 *)
(* by Brian R. Anderson *)
(* All rights reserved. *)
(* *)
(**************************************************************************)
IMPLEMENTATION MODULE CommPort [7];
FROM SYSTEM IMPORT
ADR, BYTE, WORD, ADDRESS;
FROM Storage IMPORT
ALLOCATE, DEALLOCATE;
FROM DosCalls IMPORT
DosOpen, AttributeSet, DosDevIOCtl, DosClose, DosRead, DosWrite;
TYPE
CP = POINTER TO CHAR;
VAR
pn : CARDINAL;
Handle : ARRAY [0..3] OF CARDINAL;
BufIn : ARRAY [0..3] OF CP;
BufOut : ARRAY [0..3] OF CP;
BufStart : ARRAY [0..3] OF CP;
BufLimit : ARRAY [0..3] OF CP;
BufSize : ARRAY [0..3] OF CARDINAL;
Temp : ARRAY [1..1024] OF CHAR; (* size of OS/2's serial queue *)
PROCEDURE CheckPort (portnum : CARDINAL) : BOOLEAN;
(* Check for a valid port number and open the port if it not alredy open *)
CONST
PortName : ARRAY [0..3] OF ARRAY [0..4] OF CHAR =
[['COM1', 0C], ['COM2', 0C], ['COM3', 0C], ['COM4', 0C]];
VAR
Action : CARDINAL;
BEGIN
(* check the port number *)
IF portnum > 3 THEN
RETURN FALSE;
END;
(* attempt to open the port if it is not already open *)
IF Handle[portnum] = 0 THEN
IF DosOpen(ADR(PortName[portnum]), Handle[portnum], Action, 0,
AttributeSet{}, 1, 12H, 0) # 0 THEN
RETURN FALSE;
END;
END;
RETURN TRUE;
END CheckPort;
PROCEDURE InitPort (portnum : CARDINAL; speed : BaudRate; data : DataBits;
stop : StopBits; check : Parity) : CommStatus;
(* Initialize a port *)
CONST
Rate : ARRAY BaudRate OF CARDINAL =
[110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200];
TransParity : ARRAY Parity OF BYTE = [2, 1, 0];
TYPE
LineChar = RECORD
bDataBits : BYTE;
bParity : BYTE;
bStopBits : BYTE;
END;
VAR
LC : LineChar;
BEGIN
(* Check the port number *)
IF NOT CheckPort(portnum) THEN
RETURN InvalidPort;
END;
(* Set the baud rate *)
IF DosDevIOCtl(0, ADR(Rate[speed]), 41H, 1, Handle[portnum]) # 0 THEN
RETURN InvalidParameter;
END;
(* set the characteristics *)
LC.bDataBits := BYTE(data);
IF stop = 1 THEN
DEC (stop); (* 0x00 = 1 stop bits; 0x02 = 2 stop bits *)
END;
LC.bStopBits := BYTE(stop);
LC.bParity := TransParity[check];
IF DosDevIOCtl(0, ADR(LC), 42H, 1, Handle[portnum]) # 0 THEN
RETURN InvalidParameter;
END;
RETURN Success;
END InitPort;
PROCEDURE StartReceiving (portnum, bufsize : CARDINAL) : CommStatus;
(* Start receiving characters on a port *)
BEGIN
IF NOT CheckPort(portnum) THEN
RETURN InvalidPort;
END;
IF BufStart[portnum] # NIL THEN
RETURN AlreadyReceiving;
END;
ALLOCATE (BufStart[portnum], bufsize);
BufIn[portnum] := BufStart[portnum];
BufOut[portnum] := BufStart[portnum];
BufLimit[portnum] := BufStart[portnum];
INC (BufLimit[portnum]:ADDRESS, bufsize - 1);
BufSize[portnum] := bufsize;
RETURN Success;
END StartReceiving;
PROCEDURE StopReceiving (portnum : CARDINAL) : CommStatus;
(* Stop receiving characters on a port *)
BEGIN
IF NOT CheckPort(portnum) THEN
RETURN InvalidPort;
END;
IF BufStart[portnum] # NIL THEN
DEALLOCATE (BufStart[portnum], BufSize[portnum]);
BufLimit[portnum] := NIL;
BufIn[portnum] := NIL;
BufOut[portnum] := NIL;
BufSize[portnum] := 0;
END;
DosClose(Handle[portnum]);
Handle[portnum] := 0;
RETURN Success;
END StopReceiving;
PROCEDURE GetChar (portnum : CARDINAL; VAR ch : CHAR) : CommStatus;
(* Get a character from the comm port *)
VAR
status : CARDINAL;
read : CARDINAL;
que : RECORD
ct : CARDINAL;
sz : CARDINAL;
END;
i : CARDINAL;
BEGIN
IF BufStart[portnum] = NIL THEN
RETURN NotReceiving;
END;
IF NOT CheckPort(portnum) THEN
RETURN InvalidPort;
END;
status := DosDevIOCtl (ADR (que), 0, 68H, 1, Handle[portnum]);
IF (status = 0) AND (que.ct # 0) THEN
status := DosRead (Handle[portnum], ADR (Temp), que.ct, read);
IF (status # 0) OR (read = 0) THEN
RETURN NotReceiving;
END;
FOR i := 1 TO read DO
BufIn[portnum]^ := Temp[i];
IF BufIn[portnum] = BufLimit[portnum] THEN
BufIn[portnum] := BufStart[portnum];
ELSE
INC (BufIn[portnum]:ADDRESS);
END;
IF BufIn[portnum] = BufOut[portnum] THEN
RETURN BufferOverflow;
END;
END;
END;
IF BufIn[portnum] = BufOut[portnum] THEN
RETURN NoCharacter;
END;
ch := BufOut[portnum]^;
IF BufOut[portnum] = BufLimit[portnum] THEN
BufOut[portnum] := BufStart[portnum];
ELSE
INC (BufOut[portnum]:ADDRESS);
END;
RETURN Success;
END GetChar;
PROCEDURE SendChar (portnum : CARDINAL; ch : CHAR;
modem : BOOLEAN) : CommStatus;
(* send a character to the comm port *)
VAR
wrote : CARDINAL;
status : CARDINAL;
commSt : CHAR;
BEGIN
IF NOT CheckPort(portnum) THEN
RETURN InvalidPort;
END;
status := DosDevIOCtl (ADR (commSt), 0, 64H, 1, Handle[portnum]);
IF (status # 0) OR (commSt # 0C) THEN
RETURN TimeOut;
ELSE
status := DosWrite(Handle[portnum], ADR(ch), 1, wrote);
IF (status # 0) OR (wrote # 1) THEN
RETURN TimeOut;
ELSE
RETURN Success;
END;
END;
END SendChar;
BEGIN (* module initialization *)
(* nothing open yet *)
FOR pn := 0 TO 3 DO
Handle[pn] := 0;
BufStart[pn] := NIL;
BufLimit[pn] := NIL;
BufIn[pn] := NIL;
BufOut[pn] := NIL;
BufSize[pn] := 0;
END;
END CommPort.
<a name="01e4_0021"><a name="01e4_0021">
<a name="01e4_0022">[LISTING THIRTEEN]<a name="01e4_0022">
IMPLEMENTATION MODULE Files; (* File I/O for Kermit *)
FROM FileSystem IMPORT
File, Response, Delete, Lookup, Close, ReadNBytes, WriteNBytes;
FROM Strings IMPORT
Append;
FROM Conversions IMPORT
CardToString;
FROM SYSTEM IMPORT
ADR, SIZE;
TYPE
buffer = ARRAY [1..512] OF CHAR;
VAR
ext : CARDINAL; (* new file extensions to avoid name conflict *)
inBuf, outBuf : buffer;
inP, outP : CARDINAL; (* buffer pointers *)
read, written : CARDINAL; (* number of bytes read or written *)
(* by ReadNBytes or WriteNBytes *)
PROCEDURE Open (VAR f : File; name : ARRAY OF CHAR) : Status;
(* opens an existing file for reading, returns status *)
BEGIN
Lookup (f, name, FALSE);
IF f.res = done THEN
inP := 0; read := 0;
RETURN Done;
ELSE
RETURN Error;
END;
END Open;
PROCEDURE Create (VAR f : File; name : ARRAY OF CHAR) : Status;
(* creates a new file for writing, returns status *)
VAR
ch : CHAR;
str : ARRAY [0..3] OF CHAR;
i : CARDINAL;
b : BOOLEAN;
BEGIN
LOOP
Lookup (f, name, FALSE); (* check to see if file exists *)
IF f.res = done THEN
Close (f);
(* Filename Clash: Change file name *)
IF ext > 99 THEN (* out of new names... *)
RETURN Error;
END;
i := 0;
WHILE (name[i] # 0C) AND (name[i] # '.') DO
INC (i); (* scan for end of filename *)
END;
name[i] := '.'; name[i + 1] := 'K'; name[i + 2] := 0C;
i := 0;
CardToString (ext, 1, str, i, b);
Append (name, str); (* append new extension *)
INC (ext);
ELSE
EXIT;
END;
END;
Lookup (f, name, TRUE);
IF f.res = done THEN
outP := 0;
RETURN Done;
ELSE
RETURN Error;
END;
END Create;
PROCEDURE CloseFile (VAR f : File; Which : FileType) : Status;
(* closes a file after reading or writing *)
BEGIN
written := outP;
IF (Which = Output) AND (outP > 0) THEN
WriteNBytes (f, ADR (outBuf), outP);
written := f.count;
END;
Close (f);
IF (written = outP) AND (f.res = done) THEN
RETURN Done;
ELSE
RETURN Error;
END;
END CloseFile;
PROCEDURE Get (VAR f : File; VAR ch : CHAR) : Status;
(* Reads one character from the file, returns status *)
BEGIN
IF inP = read THEN
ReadNBytes (f, ADR (inBuf), SIZE (inBuf));
read := f.count;
inP := 0;
END;
IF read = 0 THEN
RETURN EOF;
ELSE
INC (inP);
ch := inBuf[inP];
RETURN Done;
END;
END Get;
PROCEDURE Put (ch : CHAR);
(* Writes one character to the file buffer *)
BEGIN
INC (outP);
outBuf[outP] := ch;
END Put;
PROCEDURE DoWrite (VAR f : File) : Status;
(* Writes buffer to disk only if nearly full *)
BEGIN
IF outP < 400 THEN (* still room in buffer *)
RETURN Done;
ELSE
WriteNBytes (f, ADR (outBuf), outP);
written := f.count;
IF (written = outP) AND (f.res = done) THEN
outP := 0;
RETURN Done;
ELSE
RETURN Error;
END;
END;
END DoWrite;
BEGIN (* module initialization *)
ext := 0;
END Files.
<a name="01e4_0023"><a name="01e4_0023">
<a name="01e4_0024">[LISTING FOURTEEN]<a name="01e4_0024">
DEFINITION MODULE KH;
CONST
ID_OK = 25;
PARITY_OFF = 150;
ID_NONE = 152;
ID_ODD = 151;
ID_EVEN = 150;
STOP_OFF = 140;
ID_STOP2 = 142;
ID_STOP1 = 141;
DATA_OFF = 130;
ID_DATA8 = 138;
ID_DATA7 = 137;
BAUD_OFF = 120;
ID_B19K2 = 128;
ID_B9600 = 127;
ID_B4800 = 126;
ID_B2400 = 125;
ID_B1200 = 124;
ID_B600 = 123;
ID_B300 = 122;
ID_B150 = 121;
ID_B110 = 120;
COM_OFF = 100;
ID_COM2 = 101;
ID_COM1 = 100;
IDM_C2 = 24;
IDM_C1 = 23;
IDM_AMBER = 22;
IDM_GREEN = 21;
IDM_WHITE = 20;
IDM_COLORS = 19;
IDM_DIREND = 18;
ID_DIRPATH = 17;
ID_SENDFN = 16;
IDM_DIRPATH = 15;
IDM_SENDFN = 14;
IDM_TERMHELP = 13;
IDM_HELPMENU = 12;
IDM_ABOUT = 11;
IDM_PARITY = 10;
IDM_STOPBITS = 9;
IDM_DATABITS = 8;
IDM_BAUDRATE = 7;
IDM_COMPORT = 6;
IDM_QUIT = 5;
IDM_REC = 4;
IDM_SEND = 3;
IDM_CONNECT = 2;
IDM_DIR = 1;
IDM_OPTIONS = 52;
IDM_FILE = 51;
IDM_KERMIT = 50;
END KH.
<a name="01e4_0025"><a name="01e4_0025">
<a name="01e4_0026">
[LISTING FIFTEEN]<a name="01e4_0026">
IMPLEMENTATION MODULE KH;
END KH.
<a name="01e4_0027"><a name="01e4_0027">
<a name="01e4_0028">
[LISTING SIXTEEN]<a name="01e4_0028">
#define IDM_KERMIT 50
#define IDM_FILE 51
#define IDM_OPTIONS 52
#define IDM_HELP 0
#define IDM_DIR 1
#define IDM_CONNECT 2
#define IDM_SEND 3
#define IDM_REC 4
#define IDM_QUIT 5
#define IDM_COMPORT 6
#define IDM_BAUDRATE 7
#define IDM_DATABITS 8
#define IDM_STOPBITS 9
#define IDM_PARITY 10
#define IDM_ABOUT 11
#define IDM_HELPMENU 12
#define IDM_TERMHELP 13
#define IDM_SENDFN 14
#define IDM_DIRPATH 15
#define ID_SENDFN 16
#define ID_DIRPATH 17
#define IDM_DIREND 18
#define IDM_COLORS 19
#define IDM_WHITE 20
#define IDM_GREEN 21
#define IDM_AMBER 22
#define IDM_C1 23
#define IDM_C2 24
#define ID_OK 25
#define ID_COM1 100
#define ID_COM2 101
#define ID_B110 120
#define ID_B150 121
#define ID_B300 122
#define ID_B600 123
#define ID_B1200 124
#define ID_B2400 125
#define ID_B4800 126
#define ID_B9600 127
#define ID_B19K2 128
#define ID_DATA7 137
#define ID_DATA8 138
#define ID_STOP1 141
#define ID_STOP2 142
#define ID_EVEN 150
#define ID_ODD 151
#define ID_NONE 152
<a name="01e4_0029"><a name="01e4_0029">
<a name="01e4_002a">
[LISTING SEVENTEEN]<a name="01e4_002a">
IMPLEMENTATION MODULE DataLink; (* Sends and Receives Packets for PCKermit *)
FROM ElapsedTime IMPORT
StartTime, GetTime;
FROM Screen IMPORT
ClrScr, WriteString, WriteLn;
FROM OS2DEF IMPORT
HIWORD, LOWORD;
FROM PMWIN IMPORT
MPARAM, MPFROM2SHORT, WinPostMsg;
FROM Shell IMPORT
ChildFrameWindow, comport;
FROM CommPort IMPORT
CommStatus, GetChar, SendChar;
FROM PAD IMPORT
PacketType, yourNPAD, yourPADC, yourEOL;
FROM KH IMPORT
COM_OFF;
FROM SYSTEM IMPORT
BYTE;
IMPORT ASCII;
CONST
MAXtime = 100; (* hundredths of a second -- i.e., one second *)
MAXsohtrys = 100;
DL_BadCS = 1;
DL_NoSOH = 2;
TYPE
SMALLSET = SET OF [0..7]; (* BYTE *)
VAR
ch : CHAR;
status : CommStatus;
PROCEDURE Delay (t : CARDINAL);
(* delay time in milliseconds *)
VAR
tmp : LONGINT;
BEGIN
tmp := t DIV 10;
StartTime;
WHILE GetTime() < tmp DO
END;
END Delay;
PROCEDURE ByteAnd (a, b : BYTE) : BYTE;
BEGIN
RETURN BYTE (SMALLSET (a) * SMALLSET (b));
END ByteAnd;
PROCEDURE Char (c : INTEGER) : CHAR;
(* converts a number 0-95 into a printable character *)
BEGIN
RETURN (CHR (CARDINAL (ABS (c) + 32)));
END Char;
PROCEDURE UnChar (c : CHAR) : INTEGER;
(* converts a character into its corresponding number *)
BEGIN
RETURN (ABS (INTEGER (ORD (c)) - 32));
END UnChar;
PROCEDURE FlushUART;
(* ensure no characters left in UART holding registers *)
BEGIN
Delay (500);
REPEAT
status := GetChar (comport - COM_OFF, ch);
UNTIL status = NoCharacter;
END FlushUART;
PROCEDURE SendPacket (s : PacketType);
(* Adds SOH and CheckSum to packet *)
VAR
i : CARDINAL;
checksum : INTEGER;
BEGIN
Delay (10); (* give host a chance to catch its breath *)
FOR i := 1 TO yourNPAD DO
status := SendChar (comport - COM_OFF, yourPADC, FALSE);
END;
status := SendChar (comport - COM_OFF, ASCII.soh, FALSE);
i := 1;
checksum := 0;
WHILE s[i] # 0C DO
INC (checksum, ORD (s[i]));
status := SendChar (comport - COM_OFF, s[i], FALSE);
INC (i);
END;
checksum := checksum + (INTEGER (BITSET (checksum) * {7, 6}) DIV 64);
checksum := INTEGER (BITSET (checksum) * {5, 4, 3, 2, 1, 0});
status := SendChar (comport - COM_OFF, Char (checksum), FALSE);
IF yourEOL # 0C THEN
status := SendChar (comport - COM_OFF, yourEOL, FALSE);
END;
END SendPacket;
PROCEDURE ReceivePacket (VAR r : PacketType) : BOOLEAN;
(* strips SOH and checksum -- returns status: TRUE = good packet *)
(* received; FALSE = timed out waiting for packet or checksum error *)
VAR
sohtrys : INTEGER;
i, len : INTEGER;
ch : CHAR;
checksum : INTEGER;
mycheck, yourcheck : CHAR;
BEGIN
sohtrys := MAXsohtrys;
REPEAT
StartTime;
REPEAT
status := GetChar (comport - COM_OFF, ch);
UNTIL (status = Success) OR (GetTime() > MAXtime);
ch := CHAR (ByteAnd (ch, 177C)); (* mask off MSB *)
(* skip over up to MAXsohtrys padding characters, *)
(* but allow only MAXsohtrys/10 timeouts *)
IF status = Success THEN
DEC (sohtrys);
ELSE
DEC (sohtrys, 10);
END;
UNTIL (ch = ASCII.soh) OR (sohtrys <= 0);
IF ch = ASCII.soh THEN
(* receive rest of packet *)
StartTime;
REPEAT
status := GetChar (comport - COM_OFF, ch);
UNTIL (status = Success) OR (GetTime() > MAXtime);
ch := CHAR (ByteAnd (ch, 177C));
len := UnChar (ch);
r[1] := ch;
checksum := ORD (ch);
i := 2; (* on to second character in packet -- after LEN *)
REPEAT
StartTime;
REPEAT
status := GetChar (comport - COM_OFF, ch);
UNTIL (status = Success) OR (GetTime() > MAXtime);
ch := CHAR (ByteAnd (ch, 177C));
r[i] := ch; INC (i);
INC (checksum, (ORD (ch)));
UNTIL (i > len);
(* get checksum character *)
StartTime;
REPEAT
status := GetChar (comport - COM_OFF, ch);
UNTIL (status = Success) OR (GetTime() > MAXtime);
ch := CHAR (ByteAnd (ch, 177C));
yourcheck := ch;
r[i] := 0C;
checksum := checksum +
(INTEGER (BITSET (checksum) * {7, 6}) DIV 64);
checksum := INTEGER (BITSET (checksum) * {5, 4, 3, 2, 1, 0});
mycheck := Char (checksum);
IF mycheck = yourcheck THEN (* checksum OK *)
RETURN TRUE;
ELSE (* ERROR!!! *)
WinPostMsg (ChildFrameWindow, WM_DL,
MPFROM2SHORT (DL_BadCS, 0), 0);
RETURN FALSE;
END;
ELSE
WinPostMsg (ChildFrameWindow, WM_DL,
MPFROM2SHORT (DL_NoSOH, 0), 0);
RETURN FALSE;
END;
END ReceivePacket;
PROCEDURE DoDLMsg (mp1, mp2 : MPARAM);
(* Process DataLink Messages *)
BEGIN
CASE LOWORD (mp1) OF
DL_BadCS:
WriteString ("Bad Checksum"); WriteLn;
| DL_NoSOH:
WriteString ("No SOH"); WriteLn;
ELSE
(* Do Nothing *)
END;
END DoDLMsg;
END DataLink.
<a name="01e4_002b"><a name="01e4_002b">
<a name="01e4_002c">[LISTING EIGHTEEN]<a name="01e4_002c">
#include <os2.h>
#include "pckermit.h"
ICON IDM_KERMIT pckermit.ico
MENU IDM_KERMIT
BEGIN
SUBMENU "~File", IDM_FILE
BEGIN
MENUITEM "~Directory...", IDM_DIR
MENUITEM "~Connect\t^C", IDM_CONNECT
MENUITEM "~Send...\t^S", IDM_SEND
MENUITEM "~Receive...\t^R", IDM_REC
MENUITEM SEPARATOR
MENUITEM "E~xit\t^X", IDM_QUIT
MENUITEM "A~bout PCKermit...", IDM_ABOUT
END
SUBMENU "~Options", IDM_OPTIONS
BEGIN
MENUITEM "~COM port...", IDM_COMPORT
MENUITEM "~Baud rate...", IDM_BAUDRATE
MENUITEM "~Data bits...", IDM_DATABITS
MENUITEM "~Stop bits...", IDM_STOPBITS
MENUITEM "~Parity bits...", IDM_PARITY
END
SUBMENU "~Colors", IDM_COLORS
BEGIN
MENUITEM "~White Mono", IDM_WHITE
MENUITEM "~Green Mono", IDM_GREEN
MENUITEM "~Amber Mono", IDM_AMBER
MENUITEM "Full Color ~1", IDM_C1
MENUITEM "Full Color ~2", IDM_C2
END
MENUITEM "F1=Help", IDM_HELP, MIS_HELP | MIS_BUTTONSEPARATOR
END
ACCELTABLE IDM_KERMIT
BEGIN
"^C", IDM_CONNECT
"^S", IDM_SEND
"^R", IDM_REC
"^X", IDM_QUIT
END
DLGTEMPLATE IDM_COMPORT LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_COMPORT, 129, 91, 143, 54, FS_NOBYTEALIGN | FS_DLGBORDER |
WS_VISIBLE | WS_CLIPSIBLINGS | WS_SAVEBITS
BEGIN
CONTROL "Select COM Port", IDM_COMPORT, 10, 9, 83, 38,
WC_STATIC, SS_GROUPBOX | WS_VISIBLE
CONTROL "COM1", ID_COM1, 30, 25, 43, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_GROUP | WS_TABSTOP | WS_VISIBLE
CONTROL "COM2", ID_COM2, 30, 15, 39, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "OK", ID_OK, 101, 10, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
BS_DEFAULT | WS_GROUP | WS_TABSTOP | WS_VISIBLE
END
END
DLGTEMPLATE IDM_BAUDRATE LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_BAUDRATE, 131, 54, 142, 115, FS_NOBYTEALIGN |
FS_DLGBORDER | WS_VISIBLE | WS_CLIPSIBLINGS | WS_SAVEBITS
BEGIN
CONTROL "Select Baud Rate", IDM_BAUDRATE, 8, 6, 85, 107,
WC_STATIC, SS_GROUPBOX | WS_VISIBLE
CONTROL "110 Baud", ID_B110, 20, 90, 62, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_GROUP | WS_TABSTOP | WS_VISIBLE
CONTROL "150 Baud", ID_B150, 20, 80, 57, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "300 Baud", ID_B300, 20, 70, 58, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "600 Baud", ID_B600, 20, 60, 54, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "1200 Baud", ID_B1200, 20, 50, 59, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "2400 Baud", ID_B2400, 20, 40, 63, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "4800 Baud", ID_B4800, 20, 30, 62, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "9600 Baud", ID_B9600, 20, 20, 59, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "19,200 Baud", ID_B19K2, 20, 10, 69, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "OK", ID_OK, 100, 8, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
BS_DEFAULT | WS_GROUP | WS_TABSTOP | WS_VISIBLE
END
END
DLGTEMPLATE IDM_DATABITS LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_DATABITS, 137, 80, 140, 56, FS_NOBYTEALIGN |
FS_DLGBORDER | WS_VISIBLE | WS_SAVEBITS
BEGIN
CONTROL "Select Data Bits", IDM_DATABITS, 8, 11, 80, 36,
WC_STATIC, SS_GROUPBOX | WS_VISIBLE
CONTROL "7 Data Bits", ID_DATA7, 15, 25, 67, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_GROUP | WS_TABSTOP | WS_VISIBLE
CONTROL "8 Data Bits", ID_DATA8, 15, 15, 64, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "OK", ID_OK, 96, 12, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
BS_DEFAULT | WS_GROUP | WS_TABSTOP | WS_VISIBLE
END
END
DLGTEMPLATE IDM_STOPBITS LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_STOPBITS, 139, 92, 140, 43, FS_NOBYTEALIGN |
FS_DLGBORDER | WS_VISIBLE | WS_SAVEBITS
BEGIN
CONTROL "Select Stop Bits", IDM_STOPBITS, 9, 6, 80, 32,
WC_STATIC, SS_GROUPBOX | WS_VISIBLE
CONTROL "1 Stop Bit", ID_STOP1, 20, 20, 57, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_GROUP | WS_TABSTOP | WS_VISIBLE
CONTROL "2 Stop Bits", ID_STOP2, 20, 10, 60, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "OK", ID_OK, 96, 8, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
BS_DEFAULT | WS_GROUP | WS_TABSTOP | WS_VISIBLE
END
END
DLGTEMPLATE IDM_PARITY LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_PARITY, 138, 84, 134, 57, FS_NOBYTEALIGN | FS_DLGBORDER |
WS_VISIBLE | WS_SAVEBITS
BEGIN
CONTROL "Select Parity", IDM_PARITY, 12, 6, 64, 46, WC_STATIC,
SS_GROUPBOX | WS_VISIBLE
CONTROL "Even", ID_EVEN, 25, 30, 40, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_GROUP | WS_TABSTOP | WS_VISIBLE
CONTROL "Odd", ID_ODD, 25, 20, 38, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "None", ID_NONE, 25, 10, 40, 10, WC_BUTTON,
BS_AUTORADIOBUTTON | WS_TABSTOP | WS_VISIBLE
CONTROL "OK", ID_OK, 88, 8, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
BS_DEFAULT | WS_GROUP | WS_TABSTOP | WS_VISIBLE
END
END
DLGTEMPLATE IDM_ABOUT LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_ABOUT, 93, 74, 229, 88, FS_NOBYTEALIGN | FS_DLGBORDER |
WS_VISIBLE | WS_SAVEBITS
BEGIN
ICON IDM_KERMIT -1, 12, 64, 22, 16
CONTROL "PCKermit for OS/2", 256, 67, 70, 82, 8, WC_STATIC,
SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "Copyright (c) 1990 by Brian R. Anderson", 257, 27, 30, 172, 8,
WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "Microcomputer to Mainframe Communications", 259, 13, 50, 199, 8,
WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL " OK ", 258, 88, 10, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
BS_DEFAULT | WS_TABSTOP | WS_VISIBLE
END
END
DLGTEMPLATE IDM_HELPMENU LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_HELPMENU, 83, 45, 224, 125, FS_NOBYTEALIGN | FS_DLGBORDER |
WS_VISIBLE | WS_CLIPSIBLINGS | WS_SAVEBITS
BEGIN
ICON IDM_KERMIT -1, 14, 99, 21, 16
CONTROL "PCKermit Help Menu", 256, 64, 106, 91, 8, WC_STATIC,
SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "set communications Options .................. Alt, O",
258, 10, 80, 201, 8, WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP |
WS_GROUP | WS_VISIBLE
CONTROL "Connect to Host ................................... Alt, F; C",
259, 10, 70, 204, 8, WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP |
WS_GROUP | WS_VISIBLE
CONTROL "Directory .............................................. Alt, F; D",
260, 10, 60, 207, 8, WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP |
WS_GROUP | WS_VISIBLE
CONTROL "Send a File .......................................... Alt, F; S",
261, 10, 50, 207, 8, WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP |
WS_GROUP | WS_VISIBLE
CONTROL "Receive a File ...................................... Alt, F; R",
262, 10, 40, 209, 8, WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP |
WS_GROUP | WS_VISIBLE
CONTROL "Exit ...................................................... Alt, F; X",
263, 10, 30, 205, 8, WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP |
WS_GROUP | WS_VISIBLE
CONTROL "OK", 264, 83, 9, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
WS_TABSTOP | WS_VISIBLE | BS_DEFAULT
END
END
DLGTEMPLATE IDM_TERMHELP LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_TERMHELP, 81, 20, 238, 177, FS_NOBYTEALIGN |
FS_DLGBORDER | WS_VISIBLE | WS_CLIPSIBLINGS | WS_SAVEBITS
BEGIN
CONTROL "^E = Echo mode", 256, 10, 160, 72, 8, WC_STATIC,
SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "^L = Local echo mode", 257, 10, 150, 97, 8, WC_STATIC,
SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "^T = Terminal Mode (no echo)", 258, 10, 140, 131, 8, WC_STATIC,
SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "^N = Newline mode (<cr> --> <cr><lf>)", 259, 10, 130, 165, 8,
WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "^O = Newline mode OFF", 260, 10, 120, 109, 8, WC_STATIC,
SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "Televideo TVI950 / IBM 7171 Terminal Emulation", 261, 10, 100, 217, 8,
WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "Sh-F1 - Sh-F12 = PF1 - PF12", 262, 10, 90, 135, 8,
WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "Home = Clear", 263, 10, 80, 119, 8, WC_STATIC,
SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "PgDn = Page Down (as used in PROFS)",
264, 10, 70, 228, 8, WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP |
WS_GROUP | WS_VISIBLE
CONTROL "PgUp = Page Up (as used in PROFS)",
265, 10, 60, 227, 8, WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP |
WS_GROUP | WS_VISIBLE
CONTROL "Insert = Insert (Enter to Clear)", 266, 10, 40, 221, 8,
WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "Delete = Delete", 267, 10, 30, 199, 8,
WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "Control-G = Reset (rewrites the screen)", 268, 10, 20, 222, 8,
WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "Cursor Keys (i.e., Up, Down, Left, Right) all work.",
269, 10, 10, 229, 8, WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP |
WS_GROUP | WS_VISIBLE
CONTROL "OK", 270, 193, 158, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
BS_DEFAULT | WS_TABSTOP | WS_VISIBLE
CONTROL "End = End (as used in PROFS)", 271, 10, 50, 209, 8,
WC_STATIC, SS_TEXT | DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
END
END
DLGTEMPLATE IDM_SENDFN LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_SENDFN, 113, 90, 202, 60, FS_NOBYTEALIGN | FS_DLGBORDER |
WS_VISIBLE | WS_SAVEBITS
BEGIN
CONTROL "Send File", 256, 4, 4, 195, 24, WC_STATIC, SS_GROUPBOX |
WS_GROUP | WS_VISIBLE
CONTROL "Enter filename:", 257, 13, 11, 69, 8, WC_STATIC, SS_TEXT |
DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
ICON IDM_KERMIT -1, 15, 38, 22, 16
CONTROL "PCKermit for OS/2", 259, 59, 45, 82, 8, WC_STATIC, SS_TEXT |
DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "OK", 260, 154, 36, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
WS_TABSTOP | WS_VISIBLE | BS_DEFAULT
CONTROL "", ID_SENDFN, 89, 10, 98, 8, WC_ENTRYFIELD, ES_LEFT |
ES_MARGIN | WS_TABSTOP | WS_VISIBLE
END
END
DLGTEMPLATE IDM_DIRPATH LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_DIRPATH, 83, 95, 242, 46, FS_NOBYTEALIGN | FS_DLGBORDER |
WS_VISIBLE | WS_SAVEBITS
BEGIN
CONTROL "Directory", 256, 7, 5, 227, 24, WC_STATIC, SS_GROUPBOX |
WS_GROUP | WS_VISIBLE
CONTROL "Path:", 257, 28, 11, 26, 8, WC_STATIC, SS_TEXT | DT_LEFT |
DT_TOP | WS_GROUP | WS_VISIBLE
CONTROL "OK", 258, 185, 31, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
WS_TABSTOP | WS_VISIBLE | BS_DEFAULT
CONTROL "*.*", ID_DIRPATH, 57, 11, 166, 8, WC_ENTRYFIELD, ES_LEFT |
ES_AUTOSCROLL | ES_MARGIN | WS_TABSTOP | WS_VISIBLE
END
END
DLGTEMPLATE IDM_DIREND LOADONCALL MOVEABLE DISCARDABLE
BEGIN
DIALOG "", IDM_DIREND, 149, 18, 101, 27, FS_NOBYTEALIGN | FS_DLGBORDER |
WS_VISIBLE | WS_SAVEBITS
BEGIN
CONTROL "Cancel", 256, 30, 2, 38, 12, WC_BUTTON, BS_PUSHBUTTON |
BS_DEFAULT | WS_TABSTOP | WS_VISIBLE
CONTROL "Directory Complete", 257, 9, 16, 84, 8, WC_STATIC, SS_TEXT |
DT_LEFT | DT_TOP | WS_GROUP | WS_VISIBLE
END
END
<a name="01e4_002d"><a name="01e4_002d">
<a name="01e4_002e">[LISTING NINETEEN]<a name="01e4_002e">
HEAPSIZE 16384
STACKSIZE 16384
EXPORTS
WindowProc
ChildWindowProc
[FILE PCKERMIT]
OS2DEF.SYM: OS2DEF.DEF
M2 OS2DEF.DEF/OUT:OS2DEF.SYM
OS2DEF.OBJ: OS2DEF.MOD OS2DEF.SYM
M2 OS2DEF.MOD/OUT:OS2DEF.OBJ
PMWIN.SYM: PMWIN.DEF OS2DEF.SYM
M2 PMWIN.DEF/OUT:PMWIN.SYM
PMWIN.OBJ: PMWIN.MOD OS2DEF.SYM PMWIN.SYM
M2 PMWIN.MOD/OUT:PMWIN.OBJ
KH.SYM: KH.DEF
M2 KH.DEF/OUT:KH.SYM
KH.OBJ: KH.MOD KH.SYM
M2 KH.MOD/OUT:KH.OBJ
SHELL.SYM: SHELL.DEF PMWIN.SYM OS2DEF.SYM
M2 SHELL.DEF/OUT:SHELL.SYM
TERM.SYM: TERM.DEF
M2 TERM.DEF/OUT:TERM.SYM
PAD.SYM: PAD.DEF PMWIN.SYM
M2 PAD.DEF/OUT:PAD.SYM
DATALINK.SYM: DATALINK.DEF PAD.SYM PMWIN.SYM
M2 DATALINK.DEF/OUT:DATALINK.SYM
PMAVIO.SYM: PMAVIO.DEF PMWIN.SYM OS2DEF.SYM
M2 PMAVIO.DEF/OUT:PMAVIO.SYM
PMAVIO.OBJ: PMAVIO.MOD PMAVIO.SYM
M2 PMAVIO.MOD/OUT:PMAVIO.OBJ
PMGPI.SYM: PMGPI.DEF OS2DEF.SYM
M2 PMGPI.DEF/OUT:PMGPI.SYM
PMGPI.OBJ: PMGPI.MOD OS2DEF.SYM PMGPI.SYM
M2 PMGPI.MOD/OUT:PMGPI.OBJ
COMMPORT.SYM: COMMPORT.DEF
M2 COMMPORT.DEF/OUT:COMMPORT.SYM
COMMPORT.OBJ: COMMPORT.MOD COMMPORT.SYM
M2 COMMPORT.MOD/OUT:COMMPORT.OBJ
FILES.SYM: FILES.DEF
M2 FILES.DEF/OUT:FILES.SYM
PCKERMIT.OBJ: PCKERMIT.MOD SHELL.SYM KH.SYM PMWIN.SYM OS2DEF.SYM
M2 PCKERMIT.MOD/OUT:PCKERMIT.OBJ
SCREEN.SYM: SCREEN.DEF PMAVIO.SYM
M2 SCREEN.DEF/OUT:SCREEN.SYM
SCREEN.OBJ: SCREEN.MOD SCREEN.SYM
M2 SCREEN.MOD/OUT:SCREEN.OBJ
FILES.OBJ: FILES.MOD FILES.SYM
M2 FILES.MOD/OUT:FILES.OBJ
SHELL.OBJ: SHELL.MOD COMMPORT.SYM KH.SYM PMGPI.SYM PMWIN.SYM PMAVIO.SYM -
SCREEN.SYM DATALINK.SYM PAD.SYM TERM.SYM OS2DEF.SYM SHELL.SYM
M2 SHELL.MOD/OUT:SHELL.OBJ
TERM.OBJ: TERM.MOD COMMPORT.SYM KH.SYM SHELL.SYM PMWIN.SYM SCREEN.SYM TERM.SYM
M2 TERM.MOD/OUT:TERM.OBJ
PAD.OBJ: PAD.MOD DATALINK.SYM KH.SYM SHELL.SYM PMWIN.SYM COMMPORT.SYM -
FILES.SYM OS2DEF.SYM SCREEN.SYM PAD.SYM
M2 PAD.MOD/OUT:PAD.OBJ
DATALINK.OBJ: DATALINK.MOD KH.SYM PAD.SYM COMMPORT.SYM SHELL.SYM PMWIN.SYM -
OS2DEF.SYM SCREEN.SYM DATALINK.SYM
M2 DATALINK.MOD/OUT:DATALINK.OBJ
PCKERMIT.res: PCKERMIT.rc PCKERMIT.h PCKERMIT.ico
rc -r PCKERMIT.rc
PCKERMIT.EXE: OS2DEF.OBJ PMWIN.OBJ KH.OBJ PMAVIO.OBJ PMGPI.OBJ COMMPORT.OBJ -
PCKERMIT.OBJ SCREEN.OBJ FILES.OBJ SHELL.OBJ TERM.OBJ PAD.OBJ DATALINK.OBJ
LINK @PCKERMIT.LNK
rc PCKERMIT.res
PCKERMIT.exe: PCKERMIT.res
rc PCKERMIT.res
[FILE PCKERMIT.LNK]
KH.OBJ+
pckermit.OBJ+
SCREEN.OBJ+
COMMPORT.OBJ+
FILES.OBJ+
SHELL.OBJ+
TERM.OBJ+
PAD.OBJ+
DATALINK.OBJ
pckermit
pckermit
PM+
M2LIB+
DOSCALLS+
OS2
pckermit.edf
[FILE PAD.MOD]
IMPLEMENTATION MODULE PAD; (* Packet Assembler/Disassembler for Kermit *)
FROM SYSTEM IMPORT
ADR;
FROM Storage IMPORT
ALLOCATE, DEALLOCATE;
FROM Screen IMPORT
ClrScr, WriteString, WriteInt, WriteHex, WriteLn;
FROM OS2DEF IMPORT
HIWORD, LOWORD;
FROM DosCalls IMPORT
ExitType, DosExit;
FROM Strings IMPORT
Length, Assign;
FROM FileSystem IMPORT
File;
FROM Directories IMPORT
FileAttributes, AttributeSet, DirectoryEntry, FindFirst, FindNext;
FROM Files IMPORT
Status, FileType, Open, Create, CloseFile, Get, Put, DoWrite;
FROM PMWIN IMPORT
MPARAM, MPFROM2SHORT, WinPostMsg;
FROM Shell IMPORT
ChildFrameWindow, comport;
FROM KH IMPORT
COM_OFF;
FROM DataLink IMPORT
FlushUART, SendPacket, ReceivePacket;
FROM SYSTEM IMPORT
BYTE;
IMPORT ASCII;
CONST
myMAXL = 94;
myTIME = 10;
myNPAD = 0;
myPADC = 0C;
myEOL = 0C;
myQCTL = '#';
myQBIN = '&';
myCHKT = '1'; (* one character checksum *)
MAXtrys = 5;
(* From DEFINITION MODULE:
PAD_Quit = 0; *)
PAD_SendPacket = 1;
PAD_ResendPacket = 2;
PAD_NoSuchFile = 3;
PAD_ExcessiveErrors = 4;
PAD_ProbClSrcFile = 5;
PAD_ReceivedPacket = 6;
PAD_Filename = 7;
PAD_RequestRepeat = 8;
PAD_DuplicatePacket = 9;
PAD_UnableToOpen = 10;
PAD_ProbClDestFile = 11;
PAD_ErrWrtFile = 12;
PAD_Msg = 13;
TYPE
(* From Definition Module:
PacketType = ARRAY [1..100] OF CHAR;
*)
SMALLSET = SET OF [0..7]; (* a byte *)
VAR
yourMAXL : INTEGER; (* maximum packet length -- up to 94 *)
yourTIME : INTEGER; (* time out -- seconds *)
(* From Definition Module
yourNPAD : INTEGER; (* number of padding characters *)
yourPADC : CHAR; (* padding characters *)
yourEOL : CHAR; (* End Of Line -- terminator *)
*)
yourQCTL : CHAR; (* character for quoting controls '#' *)
yourQBIN : CHAR; (* character for quoting binary '&' *)
yourCHKT : CHAR; (* check type -- 1 = checksum, etc. *)
sF, rF : File; (* files being sent/received *)
InputFileOpen : BOOLEAN;
rFname : ARRAY [0..20] OF CHAR;
sP, rP : PacketType; (* packets sent/received *)
sSeq, rSeq : INTEGER; (* sequence numbers *)
PktNbr : INTEGER; (* actual packet number -- no repeats up to 32,000 *)
ErrorMsg : ARRAY [0..40] OF CHAR;
PROCEDURE PtrToStr (mp : MPARAM; VAR s : ARRAY OF CHAR);
(* Convert a pointer to a string into a string *)
TYPE
PC = POINTER TO CHAR;
VAR
p : PC;
i : CARDINAL;
c : CHAR;
BEGIN
i := 0;
REPEAT
p := PC (mp);
c := p^;
s[i] := c;
INC (i);
INC (mp);
UNTIL c = 0C;
END PtrToStr;
PROCEDURE DoPADMsg (mp1, mp2 : MPARAM);
(* Output messages for Packet Assembler/Disassembler *)
VAR
Message : ARRAY [0..40] OF CHAR;
BEGIN
CASE LOWORD (mp1) OF
PAD_SendPacket:
WriteString ("Sent Packet #");
WriteInt (LOWORD (mp2), 5);
WriteString (" (ID: "); WriteHex (HIWORD (mp2), 2);
WriteString ("h)");
| PAD_ResendPacket:
WriteString ("ERROR -- Resending:"); WriteLn;
WriteString (" Packet #");
WriteInt (LOWORD (mp2), 5);
WriteString (" (ID: "); WriteHex (HIWORD (mp2), 2);
WriteString ("h)");
| PAD_NoSuchFile:
WriteString ("No such file: ");
PtrToStr (mp2, Message); WriteString (Message);
| PAD_ExcessiveErrors:
WriteString ("Excessive errors ...");
| PAD_ProbClSrcFile:
WriteString ("Problem closing source file...");
| PAD_ReceivedPacket:
WriteString ("Received Packet #");
WriteInt (LOWORD (mp2), 5);
WriteString (" (ID: "); WriteHex (HIWORD (mp2), 2);
WriteString ("h)");
| PAD_Filename:
WriteString ("Filename = ");
PtrToStr (mp2, Message); WriteString (Message);
| PAD_RequestRepeat:
WriteString ("ERROR -- Requesting Repeat:"); WriteLn;
WriteString (" Packet #");
WriteInt (LOWORD (mp2), 5);
WriteString (" (ID: "); WriteHex (HIWORD (mp2), 2);
WriteString ("h)");
| PAD_DuplicatePacket:
WriteString ("Discarding Duplicate:"); WriteLn;
WriteString (" Packet #");
WriteString (" (ID: "); WriteHex (HIWORD (mp2), 2);
WriteString ("h)");
| PAD_UnableToOpen:
WriteString ("Unable to open file: ");
PtrToStr (mp2, Message); WriteString (Message);
| PAD_ProbClDestFile:
WriteString ("Error closing file: ");
PtrToStr (mp2, Message); WriteString (Message);
| PAD_ErrWrtFile:
WriteString ("Error writing to file: ");
PtrToStr (mp2, Message); WriteString (Message);
| PAD_Msg:
PtrToStr (mp2, Message); WriteString (Message);
ELSE
(* Do Nothing *)
END;
WriteLn;
END DoPADMsg;
PROCEDURE CloseInput;
(* Close the input file, if it exists. Reset Input File Open flag *)
BEGIN
IF InputFileOpen THEN
IF CloseFile (sF, Input) = Done THEN
InputFileOpen := FALSE;
ELSE
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ProbClSrcFile, 0),
ADR (sFname));
END;
END;
END CloseInput;
PROCEDURE NormalQuit;
(* Exit from Thread, Post message to Window *)
BEGIN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_Quit, 0), 0);
DosExit (EXIT_THREAD, 0);
END NormalQuit;
PROCEDURE ErrorQuit;
(* Exit from Thread, Post message to Window *)
BEGIN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_Error, 0), 0);
DosExit (EXIT_THREAD, 0);
END ErrorQuit;
PROCEDURE ByteXor (a, b : BYTE) : BYTE;
BEGIN
RETURN BYTE (SMALLSET (a) / SMALLSET (b));
END ByteXor;
PROCEDURE Char (c : INTEGER) : CHAR;
(* converts a number 0-94 into a printable character *)
BEGIN
RETURN (CHR (CARDINAL (ABS (c) + 32)));
END Char;
PROCEDURE UnChar (c : CHAR) : INTEGER;
(* converts a character into its corresponding number *)
BEGIN
RETURN (ABS (INTEGER (ORD (c)) - 32));
END UnChar;
PROCEDURE TellError (Seq : INTEGER);
(* Send error packet *)
BEGIN
sP[1] := Char (15);
sP[2] := Char (Seq);
sP[3] := 'E'; (* E-type packet *)
sP[4] := 'R'; (* error message starts *)
sP[5] := 'e';
sP[6] := 'm';
sP[7] := 'o';
sP[8] := 't';
sP[9] := 'e';
sP[10] := ' ';
sP[11] := 'A';
sP[12] := 'b';
sP[13] := 'o';
sP[14] := 'r';
sP[15] := 't';
sP[16] := 0C;
SendPacket (sP);
END TellError;
PROCEDURE ShowError (p : PacketType);
(* Output contents of error packet to the screen *)
VAR
i : INTEGER;
BEGIN
FOR i := 4 TO UnChar (p[1]) DO
ErrorMsg[i - 4] := p[i];
END;
ErrorMsg[i - 4] := 0C;
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_Msg, 0), ADR (ErrorMsg));
END ShowError;
PROCEDURE youInit (type : CHAR);
(* I initialization YOU for Send and Receive *)
BEGIN
sP[1] := Char (11); (* Length *)
sP[2] := Char (0); (* Sequence *)
sP[3] := type;
sP[4] := Char (myMAXL);
sP[5] := Char (myTIME);
sP[6] := Char (myNPAD);
sP[7] := CHAR (ByteXor (myPADC, 100C));
sP[8] := Char (ORD (myEOL));
sP[9] := myQCTL;
sP[10] := myQBIN;
sP[11] := myCHKT;
sP[12] := 0C; (* terminator *)
SendPacket (sP);
END youInit;
PROCEDURE myInit;
(* YOU initialize ME for Send and Receive *)
VAR
len : INTEGER;
BEGIN
len := UnChar (rP[1]);
IF len >= 4 THEN
yourMAXL := UnChar (rP[4]);
ELSE
yourMAXL := 94;
END;
IF len >= 5 THEN
yourTIME := UnChar (rP[5]);
ELSE
yourTIME := 10;
END;
IF len >= 6 THEN
yourNPAD := UnChar (rP[6]);
ELSE
yourNPAD := 0;
END;
IF len >= 7 THEN
yourPADC := CHAR (ByteXor (rP[7], 100C));
ELSE
yourPADC := 0C;
END;
IF len >= 8 THEN
yourEOL := CHR (UnChar (rP[8]));
ELSE
yourEOL := 0C;
END;
IF len >= 9 THEN
yourQCTL := rP[9];
ELSE
yourQCTL := 0C;
END;
IF len >= 10 THEN
yourQBIN := rP[10];
ELSE
yourQBIN := 0C;
END;
IF len >= 11 THEN
yourCHKT := rP[11];
IF yourCHKT # myCHKT THEN
yourCHKT := '1';
END;
ELSE
yourCHKT := '1';
END;
END myInit;
PROCEDURE SendInit;
BEGIN
youInit ('S');
END SendInit;
PROCEDURE SendFileName;
VAR
i, j : INTEGER;
BEGIN
(* send file name *)
i := 4; j := 0;
WHILE sFname[j] # 0C DO
sP[i] := sFname[j];
INC (i); INC (j);
END;
sP[1] := Char (j + 3);
sP[2] := Char (sSeq);
sP[3] := 'F'; (* filename packet *)
sP[i] := 0C;
SendPacket (sP);
END SendFileName;
PROCEDURE SendEOF;
BEGIN
sP[1] := Char (3);
sP[2] := Char (sSeq);
sP[3] := 'Z'; (* end of file *)
sP[4] := 0C;
SendPacket (sP);
END SendEOF;
PROCEDURE SendEOT;
BEGIN
sP[1] := Char (3);
sP[2] := Char (sSeq);
sP[3] := 'B'; (* break -- end of transmit *)
sP[4] := 0C;
SendPacket (sP);
END SendEOT;
PROCEDURE GetAck() : BOOLEAN;
(* Look for acknowledgement -- retry on timeouts or NAKs *)
VAR
Type : CHAR;
Seq : INTEGER;
retrys : INTEGER;
AckOK : BOOLEAN;
BEGIN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_SendPacket, 0),
MPFROM2SHORT (PktNbr, sSeq));
retrys := MAXtrys;
LOOP
IF Aborted THEN
TellError (sSeq);
CloseInput;
ErrorQuit;
END;
IF ReceivePacket (rP) THEN
Seq := UnChar (rP[2]);
Type := rP[3];
IF (Seq = sSeq) AND (Type = 'Y') THEN
AckOK := TRUE;
ELSIF (Seq = (sSeq + 1) MOD 64) AND (Type = 'N') THEN
AckOK := TRUE; (* NAK for (n + 1) taken as ACK for n *)
ELSIF Type = 'E' THEN
ShowError (rP);
AckOK := FALSE;
retrys := 0;
ELSE
AckOK := FALSE;
END;
ELSE
AckOK := FALSE;
END;
IF AckOK OR (retrys = 0) THEN
EXIT;
ELSE
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ResendPacket, 0),
MPFROM2SHORT (PktNbr, sSeq));
DEC (retrys);
FlushUART;
SendPacket (sP);
END;
END;
IF AckOK THEN
INC (PktNbr);
sSeq := (sSeq + 1) MOD 64;
RETURN TRUE;
ELSE
RETURN FALSE;
END;
END GetAck;
PROCEDURE GetInitAck() : BOOLEAN;
(* configuration for remote station *)
BEGIN
IF GetAck() THEN
myInit;
RETURN TRUE;
ELSE
RETURN FALSE;
END;
END GetInitAck;
PROCEDURE Send;
(* Send one or more files: sFname may be ambiguous *)
TYPE
LP = POINTER TO LIST; (* list of filenames *)
LIST = RECORD
fn : ARRAY [0..20] OF CHAR;
next : LP;
END;
VAR
gotFN : BOOLEAN;
attr : AttributeSet;
ent : DirectoryEntry;
front, back, t : LP; (* add at back of queue, remove from front *)
BEGIN
Aborted := FALSE;
InputFileOpen := FALSE;
front := NIL; back := NIL;
attr := AttributeSet {}; (* normal files only *)
IF Length (sFname) = 0 THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_Msg, 0),
ADR ("No file specified..."));
ErrorQuit;
ELSE
gotFN := FindFirst (sFname, attr, ent);
WHILE gotFN DO (* build up a list of file names *)
ALLOCATE (t, SIZE (LIST));
Assign (ent.name, t^.fn);
t^.next := NIL;
IF front = NIL THEN
front := t; (* start from empty queue *)
ELSE
back^.next := t; (* and to back of queue *)
END;
back := t;
gotFN := FindNext (ent);
END;
END;
IF front = NIL THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_NoSuchFile, 0),
ADR (sFname));
ErrorQuit;
ELSE
sSeq := 0; PktNbr := 0;
FlushUART;
SendInit; (* my configuration information *)
IF NOT GetInitAck() THEN (* get your configuration information *)
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
ErrorQuit;
END;
WHILE front # NIL DO (* send the files *)
Assign (front^.fn, sFname);
PktNbr := 1;
Send1;
t := front;
front := front^.next;
DEALLOCATE (t, SIZE (LIST));
END;
END;
SendEOT;
IF NOT GetAck() THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
CloseInput;
ErrorQuit;
END;
NormalQuit;
END Send;
PROCEDURE Send1;
(* Send one file: sFname *)
VAR
ch : CHAR;
i : INTEGER;
BEGIN
IF Open (sF, sFname) = Done THEN
InputFileOpen := TRUE;
ELSE;
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_NoSuchFile, 0),
ADR (sFname));
ErrorQuit;
END;
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_Filename, 0),
ADR (sFname));
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_Msg, 0),
ADR ("(<ESC> to abort file transfer.)"));
SendFileName;
IF NOT GetAck() THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
CloseInput;
ErrorQuit;
END;
(* send file *)
i := 4;
LOOP
IF Get (sF, ch) = EOF THEN (* send current packet & terminate *)
sP[1] := Char (i - 1);
sP[2] := Char (sSeq);
sP[3] := 'D'; (* data packet *)
sP[i] := 0C; (* indicate end of packet *)
SendPacket (sP);
IF NOT GetAck() THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
CloseInput;
ErrorQuit;
END;
SendEOF;
IF NOT GetAck() THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
CloseInput;
ErrorQuit;
END;
EXIT;
END;
IF i >= (yourMAXL - 4) THEN (* send current packet *)
sP[1] := Char (i - 1);
sP[2] := Char (sSeq);
sP[3] := 'D';
sP[i] := 0C;
SendPacket (sP);
IF NOT GetAck() THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
CloseInput;
ErrorQuit;
END;
i := 4;
END;
(* add character to current packet -- update count *)
IF ch > 177C THEN (* must be quoted (QBIN) and altered *)
(* toggle bit 7 to turn it off *)
ch := CHAR (ByteXor (ch, 200C));
sP[i] := myQBIN; INC (i);
END;
IF (ch < 40C) OR (ch = 177C) THEN (* quote (QCTL) and alter *)
(* toggle bit 6 to turn it on *)
ch := CHAR (ByteXor (ch, 100C));
sP[i] := myQCTL; INC (i);
END;
IF (ch = myQCTL) OR (ch = myQBIN) THEN (* must send it quoted *)
sP[i] := myQCTL; INC (i);
END;
sP[i] := ch; INC (i);
END; (* loop *)
CloseInput;
END Send1;
PROCEDURE ReceiveInit() : BOOLEAN;
(* receive my initialization information from you *)
VAR
RecOK : BOOLEAN;
trys : INTEGER;
BEGIN
trys := 1;
LOOP
IF Aborted THEN
TellError (rSeq);
ErrorQuit;
END;
RecOK := ReceivePacket (rP) AND (rP[3] = 'S');
IF RecOK OR (trys = MAXtrys) THEN
EXIT;
ELSE
INC (trys);
SendNak;
END;
END;
IF RecOK THEN
myInit;
RETURN TRUE;
ELSE
RETURN FALSE;
END;
END ReceiveInit;
PROCEDURE SendInitAck;
(* acknowledge your initialization of ME and send mine for YOU *)
BEGIN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ReceivedPacket, 0),
MPFROM2SHORT (PktNbr, rSeq));
INC (PktNbr);
rSeq := (rSeq + 1) MOD 64;
youInit ('Y');
END SendInitAck;
PROCEDURE ValidFileChar (VAR ch : CHAR) : BOOLEAN;
(* checks if character is one of 'A'..'Z', '0'..'9', makes upper case *)
BEGIN
ch := CAP (ch);
RETURN ((ch >= 'A') AND (ch <= 'Z')) OR ((ch >= '0') AND (ch <= '9'));
END ValidFileChar;
TYPE
HeaderType = (name, eot, fail);
PROCEDURE ReceiveHeader() : HeaderType;
(* receive the filename -- alter for local conditions, if necessary *)
VAR
i, j, k : INTEGER;
RecOK : BOOLEAN;
trys : INTEGER;
BEGIN
trys := 1;
LOOP
IF Aborted THEN
TellError (rSeq);
ErrorQuit;
END;
RecOK := ReceivePacket (rP) AND ((rP[3] = 'F') OR (rP[3] = 'B'));
IF trys = MAXtrys THEN
RETURN fail;
ELSIF RecOK AND (rP[3] = 'F') THEN
i := 4; (* data starts here *)
j := 0; (* beginning of filename string *)
WHILE (ValidFileChar (rP[i])) AND (j < 8) DO
rFname[j] := rP[i];
INC (i); INC (j);
END;
REPEAT
INC (i);
UNTIL (ValidFileChar (rP[i])) OR (rP[i] = 0C);
rFname[j] := '.'; INC (j);
k := 0;
WHILE (ValidFileChar (rP[i])) AND (k < 3) DO
rFname[j + k] := rP[i];
INC (i); INC (k);
END;
rFname[j + k] := 0C;
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_Filename, 0),
ADR (rFname));
RETURN name;
ELSIF RecOK AND (rP[3] = 'B') THEN
RETURN eot;
ELSE
INC (trys);
SendNak;
END;
END;
END ReceiveHeader;
PROCEDURE SendNak;
BEGIN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_RequestRepeat, 0),
MPFROM2SHORT (PktNbr, rSeq));
FlushUART;
sP[1] := Char (3); (* LEN *)
sP[2] := Char (rSeq);
sP[3] := 'N'; (* negative acknowledgement *)
sP[4] := 0C;
SendPacket (sP);
END SendNak;
PROCEDURE SendAck (Seq : INTEGER);
BEGIN
IF Seq # rSeq THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_DuplicatePacket, 0),
MPFROM2SHORT (0, rSeq));
ELSE
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ReceivedPacket, 0),
MPFROM2SHORT (PktNbr, rSeq));
rSeq := (rSeq + 1) MOD 64;
INC (PktNbr);
END;
sP[1] := Char (3);
sP[2] := Char (Seq);
sP[3] := 'Y'; (* acknowledgement *)
sP[4] := 0C;
SendPacket (sP);
END SendAck;
PROCEDURE Receive;
(* Receives a file (or files) *)
VAR
ch, Type : CHAR;
Seq : INTEGER;
i : INTEGER;
EOF, EOT, QBIN : BOOLEAN;
trys : INTEGER;
BEGIN
Aborted := FALSE;
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_Msg, 0),
ADR ("Ready to receive file(s)..."));
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_Msg, 0),
ADR ("(<ESC> to abort file transfer.)"));
FlushUART;
rSeq := 0; PktNbr := 0;
IF NOT ReceiveInit() THEN (* your configuration information *)
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
ErrorQuit;
END;
SendInitAck; (* send my configuration information *)
EOT := FALSE;
WHILE NOT EOT DO
CASE ReceiveHeader() OF
eot : EOT := TRUE; EOF := TRUE;
| name : IF Create (rF, rFname) # Done THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_UnableToOpen, 0),
ADR (rFname));
ErrorQuit;
ELSE
PktNbr := 1;
EOF := FALSE;
END;
| fail : WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
ErrorQuit;
END;
SendAck (rSeq); (* acknowledge for name or eot *)
trys := 1; (* initialize *)
WHILE NOT EOF DO
IF Aborted THEN
TellError (rSeq);
ErrorQuit;
END;
IF ReceivePacket (rP) THEN
Seq := UnChar (rP[2]);
Type := rP[3];
IF Type = 'Z' THEN
EOF := TRUE;
IF CloseFile (rF, Output) = Done THEN
(* normal file termination *)
ELSE
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ProbClDestFile, 0),
ADR (rFname));
ErrorQuit;
END;
trys := 1; (* good packet -- reset *)
SendAck (rSeq);
ELSIF Type = 'E' THEN
ShowError (rP);
ErrorQuit;
ELSIF (Type = 'D') AND ((Seq + 1) MOD 64 = rSeq) THEN
(* discard duplicate packet, and Ack anyway *)
trys := 1;
SendAck (Seq);
ELSIF (Type = 'D') AND (Seq = rSeq) THEN
(* put packet into file buffer *)
i := 4; (* first data in packet *)
WHILE rP[i] # 0C DO
ch := rP[i]; INC (i);
IF ch = yourQBIN THEN
ch := rP[i]; INC (i);
QBIN := TRUE;
ELSE
QBIN := FALSE;
END;
IF ch = yourQCTL THEN
ch := rP[i]; INC (i);
IF (ch # yourQCTL) AND (ch # yourQBIN) THEN
ch := CHAR (ByteXor (ch, 100C));
END;
END;
IF QBIN THEN
ch := CHAR (ByteXor (ch, 200C));
END;
Put (ch);
END;
(* write file buffer to disk *)
IF DoWrite (rF) # Done THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ErrWrtFile, 0),
ADR (rFname));
ErrorQuit;
END;
trys := 1;
SendAck (rSeq);
ELSE
INC (trys);
IF trys = MAXtrys THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
ErrorQuit;
ELSE
SendNak;
END;
END;
ELSE
INC (trys);
IF trys = MAXtrys THEN
WinPostMsg (ChildFrameWindow, WM_PAD,
MPFROM2SHORT (PAD_ExcessiveErrors, 0),
MPFROM2SHORT (0, 0));
ErrorQuit;
ELSE
SendNak;
END;
END;
END;
END;
NormalQuit;
END Receive;
BEGIN (* module initialization *)
yourEOL := ASCII.cr;
yourNPAD := 0;
yourPADC := 0C;
END PAD.
