if (tsdPtr->cwdPathPtr == *pathPtrPtr) {
	return 1;
    } else {
	size_t len1, len2;
	const char *str1, *str2;

	str1 = Tcl_GetStringFromObj(tsdPtr->cwdPathPtr, &len1);
	str2 = Tcl_GetStringFromObj(*pathPtrPtr, &len2);
	if ((len1 == len2) && !memcmp(str1, str2, len1)) {
	    /*
	     * The values are equal but the objects are different.  Cache the
	     * current structure in place of the old one.
	     */

	    Tcl_DecrRefCount(*pathPtrPtr);

    ClientData clientData)
{
    size_t len = 0;
    const char *str = NULL;
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);

    if (cwdObj != NULL) {
	str = Tcl_GetStringFromObj(cwdObj, &len);
    }

    Tcl_MutexLock(&cwdMutex);
    if (cwdPathPtr != NULL) {
	Tcl_DecrRefCount(cwdPathPtr);
    }
    if (cwdClientData != NULL) {

	     * i.e. the representation relative to pathPtr.
	     */

	    norm = Tcl_FSGetNormalizedPath(NULL, pathPtr);
	    if (norm != NULL) {
		const char *path, *mount;

		mount = Tcl_GetStringFromObj(mElt, &mlen);
		path = Tcl_GetStringFromObj(norm, &len);
		if (path[len-1] == '/') {
		    /*
		     * Deal with the root of the volume.
		     */

		    len--;
		}

     * are reserved for VFS use.  These names can not conflict with real UNC
     * pathnames per https://msdn.microsoft.com/en-us/library/gg465305.aspx and
     * rfc3986's definition of reg-name.
     *
     * We check these first to avoid useless calls to the native filesystem's
     * normalizePathProc.
     */
    path = Tcl_GetStringFromObj(pathPtr, &i);

    if ( (i >= 3) && ( (path[0] == '/' && path[1] == '/')
		    || (path[0] == '\\' && path[1] == '\\') ) ) {
	for ( i = 2; ; i++) {
	    if (path[i] == '\0') break;
	    if (path[i] == path[0]) break;
	}

	result = TclUpdateReturnInfo(iPtr);
    } else if (result == TCL_ERROR) {
	/*
	 * Record information about where the error occurred.
	 */

	size_t length;
	const char *pathString = Tcl_GetStringFromObj(pathPtr, &length);
	unsigned limit = 150;
	int overflow = (length > limit);

	Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
		"\n    (file \"%.*s%s\" line %d)",
		(overflow ? limit : (unsigned)length), pathString,
		(overflow ? "..." : ""), Tcl_GetErrorLine(interp)));

	result = TclUpdateReturnInfo(iPtr);
    } else if (result == TCL_ERROR) {
	/*
	 * Record information about where the error occurred.
	 */

	size_t length;
	const char *pathString = Tcl_GetStringFromObj(pathPtr, &length);
	const unsigned int limit = 150;
	int overflow = (length > limit);

	Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
		"\n    (file \"%.*s%s\" line %d)",
		(overflow ? limit : (unsigned int)length), pathString,
		(overflow ? "..." : ""), Tcl_GetErrorLine(interp)));

	     * calling 'Tcl_FSEqualPaths', and in addition avoid a nasty
	     * infinite loop bug when trying to normalize tsdPtr->cwdPathPtr.
	     */

	    size_t len1, len2;
	    const char *str1, *str2;

	    str1 = Tcl_GetStringFromObj(tsdPtr->cwdPathPtr, &len1);
	    str2 = Tcl_GetStringFromObj(norm, &len2);
	    if ((len1 == len2) && (strcmp(str1, str2) == 0)) {
		/*
		 * The pathname values are equal so retain the old pathname
		 * object which is probably already shared and free the
		 * normalized pathname that was just produced.
		 */
	    cdEqual:

				 * length of the volume name. */
    Tcl_Obj **driveNameRef)	/* If not NULL, for an absolute pathname, a
				 * place to store a pointer to an object with a
				 * refCount of 1, and whose value is the name
				 * of the volume. */
{
    size_t pathLen;
    const char *path = Tcl_GetStringFromObj(pathPtr, &pathLen);
    Tcl_PathType type;

    type = TclFSNonnativePathType(path, pathLen, filesystemPtrPtr,
	    driveNameLengthPtr, driveNameRef);

    if (type != TCL_PATH_ABSOLUTE) {
	type = TclpGetNativePathType(pathPtr, driveNameLengthPtr,

		while (numVolumes > 0) {
		    Tcl_Obj *vol;
		    size_t len;
		    const char *strVol;

		    numVolumes--;
		    Tcl_ListObjIndex(NULL, thisFsVolumes, numVolumes, &vol);
		    strVol = Tcl_GetStringFromObj(vol,&len);
		    if ((size_t) pathLen < len) {
			continue;
		    }
		    if (strncmp(strVol, path, len) == 0) {
			type = TCL_PATH_ABSOLUTE;
			if (filesystemPtrPtr != NULL) {
			    *filesystemPtrPtr = fsRecPtr->fsPtr;

	Tcl_Obj *cwdPtr = Tcl_FSGetCwd(NULL);
	if (cwdPtr != NULL) {
	    const char *cwdStr, *normPathStr;
	    size_t cwdLen, normLen;
	    Tcl_Obj *normPath = Tcl_FSGetNormalizedPath(NULL, pathPtr);

	    if (normPath != NULL) {
		normPathStr = Tcl_GetStringFromObj(normPath, &normLen);
		cwdStr = Tcl_GetStringFromObj(cwdPtr, &cwdLen);
		if ((cwdLen >= normLen) && (strncmp(normPathStr, cwdStr,
			normLen) == 0)) {
		    /*
		     * The cwd is inside the directory to be removed.  Change
		     * the cwd to [file dirname $path].
		     */