#endif
#include "tclInt.h"
#ifdef __WIN32__
#   include "tclWinInt.h"
#endif
#include "tclFileSystem.h"

/*
 * struct FilesystemRecord --
 *
 * A filesystem record is used to keep track of each filesystem currently
 * registered with the core, in a linked list.
 */

typedef struct FilesystemRecord {
    ClientData clientData;	/* Client specific data for the new filesystem
				 * (can be NULL) */
    const Tcl_Filesystem *fsPtr;/* Pointer to filesystem dispatch table. */
    struct FilesystemRecord *nextPtr;
				/* The next filesystem registered to Tcl, or
				 * NULL if no more. */
    struct FilesystemRecord *prevPtr;
				/* The previous filesystem registered to Tcl,
				 * or NULL if no more. */
} FilesystemRecord;

/*
 * This structure holds per-thread private copy of the current directory
 * maintained by the global cwdPathPtr. This structure holds per-thread
 * private copies of some global data. This way we avoid most of the
 * synchronization calls which boosts performance, at cost of having to update
 * this information each time the corresponding epoch counter changes.
 */

typedef struct ThreadSpecificData {
    int initialized;
    int cwdPathEpoch;
    int filesystemEpoch;
    Tcl_Obj *cwdPathPtr;
    ClientData cwdClientData;
    FilesystemRecord *filesystemList;
    int claims;
} ThreadSpecificData;

/*
 * Prototypes for functions defined later in this file.
 */

static int		EvalFileCallback(ClientData data[],
			    Tcl_Interp *interp, int result);
static FilesystemRecord*FsGetFirstFilesystem(void);

 */

static Tcl_Obj *cwdPathPtr = NULL;
static int cwdPathEpoch = 0;
static ClientData cwdClientData = NULL;
TCL_DECLARE_MUTEX(cwdMutex)

static Tcl_ThreadDataKey fsDataKey;

/*
 * One of these structures is used each time we successfully load a file from
 * a file system by way of making a temporary copy of the file on the native
 * filesystem. We need to store both the actual unloadProc/clientData
 * combination which was used, and the original and modified filenames, so
 * that we can correctly undo the entire operation when we want to unload the

    }
    tsdPtr->initialized = 0;
}

int
TclFSCwdIsNative(void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);

    if (tsdPtr->cwdClientData != NULL) {
	return 1;
    } else {
	return 0;
    }
}

 *----------------------------------------------------------------------
 */

int
TclFSCwdPointerEquals(
    Tcl_Obj **pathPtrPtr)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);

    Tcl_MutexLock(&cwdMutex);
    if (tsdPtr->cwdPathPtr == NULL
	    || tsdPtr->cwdPathEpoch != cwdPathEpoch) {
	if (tsdPtr->cwdPathPtr != NULL) {
	    Tcl_DecrRefCount(tsdPtr->cwdPathPtr);
	}

	}
    }
}

static void
FsRecacheFilesystemList(void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
    FilesystemRecord *fsRecPtr, *tmpFsRecPtr = NULL, *toFree = NULL, *list;

    /*
     * Trash the current cache.
     */

    fsRecPtr = tsdPtr->filesystemList;

	tsdPtr->initialized = 1;
    }
}

static FilesystemRecord *
FsGetFirstFilesystem(void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
    if (tsdPtr->filesystemList == NULL || ((tsdPtr->claims == 0)
	    && (tsdPtr->filesystemEpoch != theFilesystemEpoch))) {
	FsRecacheFilesystemList();
    }
    return tsdPtr->filesystemList;
}


{
    return (filesystemEpoch == 0 || filesystemEpoch == theFilesystemEpoch);
}

static void
Claim()
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
    tsdPtr->claims++;
}

static void
Disclaim()
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
    tsdPtr->claims--;
}

int
TclFSEpoch()
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
    return tsdPtr->filesystemEpoch;
}


/*
 * If non-NULL, clientData is owned by us and must be freed later.
 */

static void
FsUpdateCwd(
    Tcl_Obj *cwdObj,
    ClientData clientData)
{
    int len;
    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_Obj *
Tcl_FSGetCwd(
    Tcl_Interp *interp)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);

    if (TclFSCwdPointerEquals(NULL)) {
	FilesystemRecord *fsRecPtr;
	Tcl_Obj *retVal = NULL;

	/*
	 * We've never been called before, try to find a cwd. Call each of the

	     * again here. On Unix it might actually be true that we always
	     * have the correct form in the native rep in which case we could
	     * simply use:
	     *		cd = Tcl_FSGetNativePath(pathPtr);
	     * instead. This should be examined by someone on Unix.
	     */

	    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&fsDataKey);
	    ClientData cd;
	    ClientData oldcd = tsdPtr->cwdClientData;

	    /*
	     * Assumption we are using a filesystem version 2.
	     */