Tcl Source Code

static void		FileSetupProc(ClientData clientData, int flags);
static void		FileWatchProc(ClientData instanceData, int mask);
static void		FileThreadActionProc(ClientData instanceData,
			    int action);
static int		FileTruncateProc(ClientData instanceData,
			    Tcl_WideInt length);
static DWORD		FileGetType(HANDLE handle);
static int		NativeIsComPort(CONST TCHAR *nativeName);
/*
 * This structure describes the channel type structure for file based IO.
 */

static const Tcl_ChannelType fileChannelType = {
    "file",			/* Type name. */
    TCL_CHANNEL_VERSION_5,	/* v5 channel */

	createMode = TRUNCATE_EXISTING;
	break;
    default:
	createMode = OPEN_EXISTING;
	break;
    }

    /*
     * [2413550] Avoid double-open of serial ports on Windows
     * Special handling for Windows serial ports by a "name-hint"
     * to directly open it with the OVERLAPPED flag set.
     */

    if( NativeIsComPort(nativeName) ) {

	handle = TclWinSerialOpen(INVALID_HANDLE_VALUE, nativeName, accessMode);
	if (handle == INVALID_HANDLE_VALUE) {
	    TclWinConvertError(GetLastError());
	    if (interp != (Tcl_Interp *) NULL) {
		Tcl_AppendResult(interp, "couldn't open serial \"",
			TclGetString(pathPtr), "\": ",
			Tcl_PosixError(interp), NULL);
	    }
	    return NULL;
	}

	/*
	* For natively named Windows serial ports we are done.
	*/
	channel = TclWinOpenSerialChannel(handle, channelName,
		channelPermissions);

	return channel;
    }
    /*
     * If the file is being created, get the file attributes from the
     * permissions argument, else use the existing file attributes.
     */

    if (mode & O_CREAT) {
	if (permissions & S_IWRITE) {

    }

    channel = NULL;

    switch (FileGetType(handle)) {
    case FILE_TYPE_SERIAL:
	/*
	 * Natively named serial ports "com1-9", "\\\\.\\comXX" are 
	 * already done with the code above.
	 * Here we handle all other serial port names.
	 *
	 * Reopen channel for OVERLAPPED operation. Normally this shouldn't
	 * fail, because the channel exists.
	 */

	handle = TclWinSerialOpen(handle, nativeName, accessMode);
	if (handle == INVALID_HANDLE_VALUE) {
	    TclWinConvertError(GetLastError());
	    if (interp != (Tcl_Interp *) NULL) {
		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
			"couldn't reopen serial \"%s\": %s",
			TclGetString(pathPtr), Tcl_PosixError(interp)));
	    }

		type = FILE_TYPE_SERIAL;
	    }
	}
    }

    return type;
}

 /*
 *----------------------------------------------------------------------
 *
 * NativeIsComPort --
 *
 *	Determines if a path refers to a Windows serial port.
 *	A simple and efficient solution is to use a "name hint" to detect 
 *      COM ports by their filename instead of resorting to a syscall 
 *	to detect serialness after the fact.
 *	The following patterns cover common serial port names:
 *	    COM[1-9]:?
 *	    //./COM[0-9]+
 *	    \\.\COM[0-9]+
 *
 * Results:
 *	1 = serial port, 0 = not.
 *
 *----------------------------------------------------------------------
 */

static int
NativeIsComPort(
    const TCHAR *nativePath)	/* Path of file to access, native encoding. */
{
    const WCHAR *p = (const WCHAR *) nativePath;
    int i, len = wcslen(p);

    /*
     * 1. Look for com[1-9]:?
     */

    if ( (len >= 4) && (len <= 5) 
	    && (_wcsnicmp(p, L"com", 3) == 0) ) {
	/*
	* The 4th character must be a digit 1..9 optionally followed by a ":"
	*/
	
	if ( (p[3] < L'1') || (p[3] > L'9') ) {
	    return 0;
	}
	if ( (len == 5) && (p[4] != L':') ) {
	    return 0;
	}
	return 1;
    }
    
    /*
     * 2. Look for //./com[0-9]+ or \\.\com[0-9]+
     */
    
    if ( (len >= 8) && ( 
	       (_wcsnicmp(p, L"//./com", 7) == 0)
	    || (_wcsnicmp(p, L"\\\\.\\com", 7) == 0) ) )
    {
	/*
	* Charaters 8..end must be a digits 0..9
	*/
    
	for ( i=7; i<len; i++ ) {
	    if ( (p[i] < '0') || (p[i] > '9') ) {
		return 0;
	    }
	}
	return 1;
    }
    return 0;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

MODULE_SCOPE TclFile	TclWinMakeFile(HANDLE handle);
MODULE_SCOPE Tcl_Channel TclWinOpenConsoleChannel(HANDLE handle,
			    char *channelName, int permissions);
MODULE_SCOPE Tcl_Channel TclWinOpenFileChannel(HANDLE handle, char *channelName,
			    int permissions, int appendMode);
MODULE_SCOPE Tcl_Channel TclWinOpenSerialChannel(HANDLE handle,
			    char *channelName, int permissions);
MODULE_SCOPE HANDLE	TclWinSerialOpen(HANDLE handle, const TCHAR *name,
			    DWORD access);
MODULE_SCOPE int	TclWinSymLinkCopyDirectory(const TCHAR *LinkOriginal,
			    const TCHAR *LinkCopy);
MODULE_SCOPE int	TclWinSymLinkDelete(const TCHAR *LinkOriginal,
			    int linkOnly);
#if defined(TCL_THREADS) && defined(USE_THREAD_ALLOC)
MODULE_SCOPE void	TclWinFreeAllocCache(void);

    return 0;
}

/*
 *----------------------------------------------------------------------
 *
 * TclWinSerialOpen --
 *
 *	Opens or Reopens the serial port with the OVERLAPPED FLAG set
 *
 * Results:
 *	Returns the new handle, or INVALID_HANDLE_VALUE. 

 *	If an existing channel is specified it is closed and reopened.
 *
 * Side effects:
 *	May close/reopen the original handle
 *
 *----------------------------------------------------------------------
 */

HANDLE
TclWinSerialOpen(
    HANDLE handle,
    const TCHAR *name,
    DWORD access)
{
    SerialInit();

    /*
     * If an open channel is specified, close it
     */

    if ( handle != INVALID_HANDLE_VALUE && CloseHandle(handle) == FALSE) {
	return INVALID_HANDLE_VALUE;
    }

    /*
     * Multithreaded I/O needs the overlapped flag set otherwise
     * ClearCommError blocks under Windows NT/2000 until serial output is
     * finished
     */




    handle = CreateFile(name, access, 0, 0, OPEN_EXISTING,
	    FILE_FLAG_OVERLAPPED, 0);

    return handle;
}

/*
 *----------------------------------------------------------------------
 *
 * TclWinOpenSerialChannel --