*
 * Copyright (c) 1991-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * RCS: @(#) $Id: tclIOUtil.c,v 1.22 2001/09/29 11:09:35 vincentdarley Exp $
 * RCS: @(#) $Id: tclIOUtil.c,v 1.23 2001/10/18 12:08:11 vincentdarley Exp $
 */

#include "tclInt.h"
#include "tclPort.h"

/*
 * Prototypes for procedures defined later in this file.  The last

 */
int
Tcl_FSChdir(pathPtr)
    Tcl_Obj *pathPtr;
{
    Tcl_Filesystem *fsPtr;
    int retVal = -1;
    Tcl_Obj *normDirName;
    
    normDirName = Tcl_FSGetNormalizedPath(NULL, pathPtr);
    if (Tcl_FSGetNormalizedPath(NULL, pathPtr) == NULL) {
    if (normDirName == NULL) {
        return TCL_ERROR;
    }
    
    fsPtr = Tcl_FSGetFileSystemForPath(pathPtr);
    if (fsPtr != NULL) {
	Tcl_FSChdirProc *proc = fsPtr->chdirProc;
	if (proc != NULL) {

	 * thrown, we can just continue (and that will report the error
	 * to the user).  If there was no error we must assume that the
	 * cwd was actually changed to the normalized value we
	 * calculated above, and we must therefore cache that
	 * information.
	 */
	if (retVal == TCL_OK) {
	    /* 
	     * Note that this normalized path may be different to what
	     * we found above (or at least a different object), if the
	     * filesystem epoch changed recently.  This can actually
	     * happen with scripted documents very easily.  Therefore
	     * we ask for the normalized path again (the correct value
	     * will have been cached as a result of the
	     * Tcl_FSGetFileSystemForPath call above anyway).
	     */
	    Tcl_Obj *normDirName = Tcl_FSGetNormalizedPath(NULL, pathPtr);
	    if (normDirName == NULL) {
	        return TCL_ERROR;
	    }
	    /* 
	     * We will be adding a reference to this object when
	     * we store it in the cwdPathPtr.
	     */
	    Tcl_IncrRefCount(normDirName);
	    /* Get a lock on the cwd while we modify it */
	    Tcl_MutexLock(&cwdMutex);
	    /* Free up the previous cwd we stored */
	    if (cwdPathPtr != NULL) {
		Tcl_DecrRefCount(cwdPathPtr);
	    }
	    /* Now remember the current cwd */
	    cwdPathPtr = normDirName;
	    Tcl_IncrRefCount(cwdPathPtr);
	    Tcl_MutexUnlock(&cwdMutex);
	}
    }
    
    return (retVal);
}


    if (objPtr->typePtr == &tclFsPathType) {
        return TCL_OK;
    }
    
    /* Free old representation */
    if (objPtr->typePtr != NULL) {
	if (objPtr->bytes == NULL) {
	    if (objPtr->typePtr->updateStringProc == NULL) {
		if (interp != NULL) {
		    Tcl_ResetResult(interp);
		    Tcl_AppendResult(interp, "can't find object",
				     "string representation", (char *) NULL);
		}
		return TCL_ERROR;
	    }
	    objPtr->typePtr->updateStringProc(objPtr);
	}
	if ((objPtr->typePtr->freeIntRepProc) != NULL) {
	    (*objPtr->typePtr->freeIntRepProc)(objPtr);
	}
    }

    if (objPtr->typePtr == &tclFsPathType) {
	return TCL_OK;
    }
    
    /* Free old representation */
    if (objPtr->typePtr != NULL) {
	if (objPtr->bytes == NULL) {
	    if (objPtr->typePtr->updateStringProc == NULL) {
		if (interp != NULL) {
		    Tcl_ResetResult(interp);
		    Tcl_AppendResult(interp, "can't find object",
				     "string representation", (char *) NULL);
		}
	        return TCL_ERROR;
	    }
	    objPtr->typePtr->updateStringProc(objPtr);
	}
	if ((objPtr->typePtr->freeIntRepProc) != NULL) {
	    (*objPtr->typePtr->freeIntRepProc)(objPtr);
	}
    }

	    Tcl_DStringInit(&temp);
	    Tcl_JoinPath(1, &dir, &temp);
	    Tcl_DStringFree(&dirString);
	} else {
	    /* We have a user name '~user' */
	    Tcl_DStringInit(&temp);
	    if (TclpGetUserHome(name+1, &temp) == NULL) {	
		if (interp) {
		if (interp != NULL) {
		    Tcl_ResetResult(interp);
		    Tcl_AppendResult(interp, "user \"", (name+1), 
				     "\" doesn't exist", (char *) NULL);
		}
		Tcl_DStringFree(&temp);
		if (split != len) { name[split] = separator; }
		return TCL_ERROR;

    
    /* 
     * Free old representation; shouldn't normally be any,
     * but best to be safe. 
     */
    if (objPtr->typePtr != NULL) {
	if (objPtr->bytes == NULL) {
	    if (objPtr->typePtr->updateStringProc == NULL) {
		return NULL;
	    }
	    objPtr->typePtr->updateStringProc(objPtr);
	}
	if ((objPtr->typePtr->freeIntRepProc) != NULL) {
	    (*objPtr->typePtr->freeIntRepProc)(objPtr);
	}
    }