/*
 * tclWinFCmd.c
 *
 *      This file implements the Windows specific portion of file manipulation 
 *      subcommands of the "file" command. 
 *
 * Copyright (c) 1996-1998 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: tclWinFCmd.c,v 1.7 1999/12/09 14:44:11 hobbs Exp $
 */

#include "tclWinInt.h"

/*
 * The following constants specify the type of callback when
 * TraverseWinTree() calls the traverseProc()
 */

#define DOTREE_PRED   1     /* pre-order directory  */
#define DOTREE_POSTD  2     /* post-order directory */
#define DOTREE_F      3     /* regular file */

/*
 * Callbacks for file attributes code.
 */

static int		GetWinFileAttributes _ANSI_ARGS_((Tcl_Interp *interp,
			    int objIndex, CONST char *fileName,
			    Tcl_Obj **attributePtrPtr));
static int		GetWinFileLongName _ANSI_ARGS_((Tcl_Interp *interp,
			    int objIndex, CONST char *fileName,
			    Tcl_Obj **attributePtrPtr));
static int		GetWinFileShortName _ANSI_ARGS_((Tcl_Interp *interp,
			    int objIndex, CONST char *fileName,
			    Tcl_Obj **attributePtrPtr));
static int		SetWinFileAttributes _ANSI_ARGS_((Tcl_Interp *interp,
			    int objIndex, CONST char *fileName,
			    Tcl_Obj *attributePtr));
static int		CannotSetAttribute _ANSI_ARGS_((Tcl_Interp *interp,
			    int objIndex, CONST char *fileName,
			    Tcl_Obj *attributePtr));

/*
 * Constants and variables necessary for file attributes subcommand.
 */

enum {
    WIN_ARCHIVE_ATTRIBUTE,
    WIN_HIDDEN_ATTRIBUTE,
    WIN_LONGNAME_ATTRIBUTE,
    WIN_READONLY_ATTRIBUTE,
    WIN_SHORTNAME_ATTRIBUTE,
    WIN_SYSTEM_ATTRIBUTE
};

static int attributeArray[] = {FILE_ATTRIBUTE_ARCHIVE, FILE_ATTRIBUTE_HIDDEN,
	0, FILE_ATTRIBUTE_READONLY, 0, FILE_ATTRIBUTE_SYSTEM};


char *tclpFileAttrStrings[] = {
	"-archive", "-hidden", "-longname", "-readonly",
	"-shortname", "-system", (char *) NULL
};

const TclFileAttrProcs tclpFileAttrProcs[] = {
	{GetWinFileAttributes, SetWinFileAttributes},
	{GetWinFileAttributes, SetWinFileAttributes},
	{GetWinFileLongName, CannotSetAttribute},
	{GetWinFileAttributes, SetWinFileAttributes},
	{GetWinFileShortName, CannotSetAttribute},
	{GetWinFileAttributes, SetWinFileAttributes}};

/*
 * Prototype for the TraverseWinTree callback function.
 */

typedef int (TraversalProc)(Tcl_DString *srcPtr, Tcl_DString *dstPtr, 
	int type, Tcl_DString *errorPtr);

/*
 * Declarations for local procedures defined in this file:
 */

static void		StatError(Tcl_Interp *interp, CONST char *fileName);
static int		ConvertFileNameFormat(Tcl_Interp *interp, 
			    int objIndex, CONST char *fileName, int longShort,
			    Tcl_Obj **attributePtrPtr);
static int		DoCopyFile(Tcl_DString *srcPtr, Tcl_DString *dstPtr);
static int		DoCreateDirectory(Tcl_DString *pathPtr);
static int		DoDeleteFile(Tcl_DString *pathPtr);
static int		DoRemoveDirectory(Tcl_DString *pathPtr, int recursive, 
			    Tcl_DString *errorPtr);
static int		DoRenameFile(const TCHAR *nativeSrc, Tcl_DString *dstPtr);
static int		TraversalCopy(Tcl_DString *srcPtr, Tcl_DString *dstPtr, 
			    int type, Tcl_DString *errorPtr);
static int		TraversalDelete(Tcl_DString *srcPtr, Tcl_DString *dstPtr, 
			    int type, Tcl_DString *errorPtr);
static int		TraverseWinTree(TraversalProc *traverseProc,
			    Tcl_DString *sourcePtr, Tcl_DString *dstPtr, 
			    Tcl_DString *errorPtr);


/*
 *---------------------------------------------------------------------------
 *
 * TclpRenameFile, DoRenameFile --
 *
 *      Changes the name of an existing file or directory, from src to dst.
 *	If src and dst refer to the same file or directory, does nothing
 *	and returns success.  Otherwise if dst already exists, it will be
 *	deleted and replaced by src subject to the following conditions:
 *	    If src is a directory, dst may be an empty directory.
 *	    If src is a file, dst may be a file.
 *	In any other situation where dst already exists, the rename will
 *	fail.  
 *
 * Results:
 *	If the file or directory was successfully renamed, returns TCL_OK.
 *	Otherwise the return value is TCL_ERROR and errno is set to
 *	indicate the error.  Some possible values for errno are:
 *
 *	ENAMETOOLONG: src or dst names are too long.
 *	EACCES:     src or dst parent directory can't be read and/or written.
 *	EEXIST:	    dst is a non-empty directory.
 *	EINVAL:	    src is a root directory or dst is a subdirectory of src.
 *	EISDIR:	    dst is a directory, but src is not.
 *	ENOENT:	    src doesn't exist.  src or dst is "".
 *	ENOTDIR:    src is a directory, but dst is not.  
 *	EXDEV:	    src and dst are on different filesystems.
 *
 *	EACCES:     exists an open file already referring to src or dst.
 *	EACCES:     src or dst specify the current working directory (NT).
 *	EACCES:	    src specifies a char device (nul:, com1:, etc.) 
 *	EEXIST:	    dst specifies a char device (nul:, com1:, etc.) (NT)
 *	EACCES:	    dst specifies a char device (nul:, com1:, etc.) (95)
 *	
 * Side effects:
 *	The implementation supports cross-filesystem renames of files,
 *	but the caller should be prepared to emulate cross-filesystem
 *	renames of directories if errno is EXDEV.
 *
 *---------------------------------------------------------------------------
 */

int
TclpRenameFile(
    CONST char *src,		/* Pathname of file or dir to be renamed
				 * (UTF-8). */
    CONST char *dst)		/* New pathname of file or directory
				 * (UTF-8). */
{
    int result;
    TCHAR *nativeSrc;
    Tcl_DString srcString, dstString;

    nativeSrc = Tcl_WinUtfToTChar(src, -1, &srcString);
    Tcl_WinUtfToTChar(dst, -1, &dstString);

    result = DoRenameFile(nativeSrc, &dstString);
    Tcl_DStringFree(&srcString);
    Tcl_DStringFree(&dstString);
    return result;
}

static int
DoRenameFile(
    CONST TCHAR *nativeSrc,	/* Pathname of file or dir to be renamed
				 * (native). */ 
    Tcl_DString *dstPtr)	/* New pathname for file or directory
				 * (native). */
{    
    const TCHAR *nativeDst;
    DWORD srcAttr, dstAttr;

    nativeDst = (TCHAR *) Tcl_DStringValue(dstPtr);

    /*
     * Would throw an exception under NT if one of the arguments is a 
     * char block device.
     */

    __try {
	if ((*tclWinProcs->moveFileProc)(nativeSrc, nativeDst) != FALSE) {
	    return TCL_OK;
	}
    } __except (-1) {}

    TclWinConvertError(GetLastError());

    srcAttr = (*tclWinProcs->getFileAttributesProc)(nativeSrc);
    dstAttr = (*tclWinProcs->getFileAttributesProc)(nativeDst);
    if (srcAttr == 0xffffffff) {
	if ((*tclWinProcs->getFullPathNameProc)(nativeSrc, 0, NULL, NULL) >= MAX_PATH) {
	    errno = ENAMETOOLONG;
	    return TCL_ERROR;
	}
	srcAttr = 0;
    }
    if (dstAttr == 0xffffffff) {
	if ((*tclWinProcs->getFullPathNameProc)(nativeDst, 0, NULL, NULL) >= MAX_PATH) {
	    errno = ENAMETOOLONG;
	    return TCL_ERROR;
	}
	dstAttr = 0;
    }

    if (errno == EBADF) {
	errno = EACCES;
	return TCL_ERROR;
    }
    if (errno == EACCES) {
	decode:
	if (srcAttr & FILE_ATTRIBUTE_DIRECTORY) {
	    TCHAR *nativeSrcRest, *nativeDstRest;
	    char **srcArgv, **dstArgv;
	    int size, srcArgc, dstArgc;
	    WCHAR nativeSrcPath[MAX_PATH];
	    WCHAR nativeDstPath[MAX_PATH];
	    Tcl_DString srcString, dstString;
	    CONST char *src, *dst;

	    size = (*tclWinProcs->getFullPathNameProc)(nativeSrc, MAX_PATH, 
		    nativeSrcPath, &nativeSrcRest);
	    if ((size == 0) || (size > MAX_PATH)) {
		return TCL_ERROR;
	    }
	    size = (*tclWinProcs->getFullPathNameProc)(nativeDst, MAX_PATH, 
		    nativeDstPath, &nativeDstRest);
	    if ((size == 0) || (size > MAX_PATH)) {
		return TCL_ERROR;
	    }
	    (*tclWinProcs->charLowerProc)((TCHAR *) nativeSrcPath);
	    (*tclWinProcs->charLowerProc)((TCHAR *) nativeDstPath);

	    src = Tcl_WinTCharToUtf((TCHAR *) nativeSrcPath, -1, &srcString);
	    dst = Tcl_WinTCharToUtf((TCHAR *) nativeDstPath, -1, &dstString);
	    if (strncmp(src, dst, Tcl_DStringLength(&srcString)) == 0) {
		/*
		 * Trying to move a directory into itself.
		 */

		errno = EINVAL;
		Tcl_DStringFree(&srcString);
		Tcl_DStringFree(&dstString);
		return TCL_ERROR;
	    }
	    Tcl_SplitPath(src, &srcArgc, &srcArgv);
	    Tcl_SplitPath(dst, &dstArgc, &dstArgv);
	    Tcl_DStringFree(&srcString);
	    Tcl_DStringFree(&dstString);

	    if (srcArgc == 1) {
		/*
		 * They are trying to move a root directory.  Whether
		 * or not it is across filesystems, this cannot be
		 * done.
		 */

		Tcl_SetErrno(EINVAL);
	    } else if ((srcArgc > 0) && (dstArgc > 0) &&
		    (strcmp(srcArgv[0], dstArgv[0]) != 0)) {
		/*
		 * If src is a directory and dst filesystem != src
		 * filesystem, errno should be EXDEV.  It is very
		 * important to get this behavior, so that the caller
		 * can respond to a cross filesystem rename by
		 * simulating it with copy and delete.  The MoveFile
		 * system call already handles the case of moving a
		 * file between filesystems.
		 */

		Tcl_SetErrno(EXDEV);
	    }

	    ckfree((char *) srcArgv);
	    ckfree((char *) dstArgv);
	}

	/*
	 * Other types of access failure is that dst is a read-only
	 * filesystem, that an open file referred to src or dest, or that
	 * src or dest specified the current working directory on the
	 * current filesystem.  EACCES is returned for those cases.
	 */

    } else if (Tcl_GetErrno() == EEXIST) {
	/*
	 * Reports EEXIST any time the target already exists.  If it makes
	 * sense, remove the old file and try renaming again.
	 */

	if (srcAttr & FILE_ATTRIBUTE_DIRECTORY) {
	    if (dstAttr & FILE_ATTRIBUTE_DIRECTORY) {
		/*
		 * Overwrite empty dst directory with src directory.  The
		 * following call will remove an empty directory.  If it
		 * fails, it's because it wasn't empty.
		 */

		if (DoRemoveDirectory(dstPtr, 0, NULL) == TCL_OK) {
		    /*
		     * Now that that empty directory is gone, we can try
		     * renaming again.  If that fails, we'll put this empty
		     * directory back, for completeness.
		     */

		    if ((*tclWinProcs->moveFileProc)(nativeSrc, nativeDst) != FALSE) {
			return TCL_OK;
		    }

		    /*
		     * Some new error has occurred.  Don't know what it
		     * could be, but report this one.
		     */

		    TclWinConvertError(GetLastError());
		    (*tclWinProcs->createDirectoryProc)(nativeDst, NULL);
		    (*tclWinProcs->setFileAttributesProc)(nativeDst, dstAttr);
		    if (Tcl_GetErrno() == EACCES) {
			/*
			 * Decode the EACCES to a more meaningful error.
			 */

			goto decode;
		    }
		}
	    } else {	/* (dstAttr & FILE_ATTRIBUTE_DIRECTORY) == 0 */
		Tcl_SetErrno(ENOTDIR);
	    }
	} else {    /* (srcAttr & FILE_ATTRIBUTE_DIRECTORY) == 0 */
	    if (dstAttr & FILE_ATTRIBUTE_DIRECTORY) {
		Tcl_SetErrno(EISDIR);
	    } else {
		/*
		 * Overwrite existing file by:
		 * 
		 * 1. Rename existing file to temp name.
		 * 2. Rename old file to new name.
		 * 3. If success, delete temp file.  If failure,
		 *    put temp file back to old name.
		 */

		TCHAR *nativeRest, *nativeTmp, *nativePrefix;
		int result, size;
		WCHAR tempBuf[MAX_PATH];
		
		size = (*tclWinProcs->getFullPathNameProc)(nativeDst, MAX_PATH, 
			tempBuf, &nativeRest);
		if ((size == 0) || (size > MAX_PATH) || (nativeRest == NULL)) {
		    return TCL_ERROR;
		}
		nativeTmp = (TCHAR *) tempBuf;
		((char *) nativeRest)[0] = '\0';
		((char *) nativeRest)[1] = '\0';    /* In case it's Unicode. */

		result = TCL_ERROR;
		nativePrefix = (tclWinProcs->useWide) 
			? (TCHAR *) L"tclr" : (TCHAR *) "tclr";
		if ((*tclWinProcs->getTempFileNameProc)(nativeTmp, 
			nativePrefix, 0, tempBuf) != 0) {
		    /*
		     * Strictly speaking, need the following DeleteFile and
		     * MoveFile to be joined as an atomic operation so no
		     * other app comes along in the meantime and creates the
		     * same temp file.
		     */
		     
		    nativeTmp = (TCHAR *) tempBuf;
		    (*tclWinProcs->deleteFileProc)(nativeTmp);
		    if ((*tclWinProcs->moveFileProc)(nativeDst, nativeTmp) != FALSE) {
			if ((*tclWinProcs->moveFileProc)(nativeSrc, nativeDst) != FALSE) {
			    (*tclWinProcs->setFileAttributesProc)(nativeTmp, 
				    FILE_ATTRIBUTE_NORMAL);
			    (*tclWinProcs->deleteFileProc)(nativeTmp);
			    return TCL_OK;
			} else {
			    (*tclWinProcs->deleteFileProc)(nativeDst);
			    (*tclWinProcs->moveFileProc)(nativeTmp, nativeDst);
			}
		    } 

		    /*
		     * Can't backup dst file or move src file.  Return that
		     * error.  Could happen if an open file refers to dst.
		     */

		    TclWinConvertError(GetLastError());
		    if (Tcl_GetErrno() == EACCES) {
			/*
			 * Decode the EACCES to a more meaningful error.
			 */

			goto decode;
		    }
		}
		return result;
	    }
	}
    }
    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpCopyFile, DoCopyFile --
 *
 *      Copy a single file (not a directory).  If dst already exists and
 *	is not a directory, it is removed.
 *
 * Results:
 *	If the file was successfully copied, returns TCL_OK.  Otherwise
 *	the return value is TCL_ERROR and errno is set to indicate the
 *	error.  Some possible values for errno are:
 *
 *	EACCES:     src or dst parent directory can't be read and/or written.
 *	EISDIR:	    src or dst is a directory.
 *	ENOENT:	    src doesn't exist.  src or dst is "".
 *
 *	EACCES:     exists an open file already referring to dst (95).
 *	EACCES:	    src specifies a char device (nul:, com1:, etc.) (NT)
 *	ENOENT:	    src specifies a char device (nul:, com1:, etc.) (95)
 *
 * Side effects:
 *	It is not an error to copy to a char device.
 *
 *---------------------------------------------------------------------------
 */

int 
TclpCopyFile(
    CONST char *src,		/* Pathname of file to be copied (UTF-8). */
    CONST char *dst)		/* Pathname of file to copy to (UTF-8). */
{
    int result;
    Tcl_DString srcString, dstString;

    Tcl_WinUtfToTChar(src, -1, &srcString);
    Tcl_WinUtfToTChar(dst, -1, &dstString);
    result = DoCopyFile(&srcString, &dstString);
    Tcl_DStringFree(&srcString);
    Tcl_DStringFree(&dstString);
    return result;
}

static int
DoCopyFile(
    Tcl_DString *srcPtr,	/* Pathname of file to be copied (native). */
    Tcl_DString *dstPtr)	/* Pathname of file to copy to (native). */
{
    CONST TCHAR *nativeSrc, *nativeDst;

    nativeSrc = (TCHAR *) Tcl_DStringValue(srcPtr);
    nativeDst = (TCHAR *) Tcl_DStringValue(dstPtr);

    /*
     * Would throw an exception under NT if one of the arguments is a char
     * block device.
     */

    __try {
	if ((*tclWinProcs->copyFileProc)(nativeSrc, nativeDst, 0) != FALSE) {
	    return TCL_OK;
	}
    } __except (-1) {}

    TclWinConvertError(GetLastError());
    if (Tcl_GetErrno() == EBADF) {
	Tcl_SetErrno(EACCES);
	return TCL_ERROR;
    }
    if (Tcl_GetErrno() == EACCES) {
	DWORD srcAttr, dstAttr;

	srcAttr = (*tclWinProcs->getFileAttributesProc)(nativeSrc);
	dstAttr = (*tclWinProcs->getFileAttributesProc)(nativeDst);
	if (srcAttr != 0xffffffff) {
	    if (dstAttr == 0xffffffff) {
		dstAttr = 0;
	    }
	    if ((srcAttr & FILE_ATTRIBUTE_DIRECTORY) ||
		    (dstAttr & FILE_ATTRIBUTE_DIRECTORY)) {
		Tcl_SetErrno(EISDIR);
	    }
	    if (dstAttr & FILE_ATTRIBUTE_READONLY) {
		(*tclWinProcs->setFileAttributesProc)(nativeDst, 
			dstAttr & ~FILE_ATTRIBUTE_READONLY);
		if ((*tclWinProcs->copyFileProc)(nativeSrc, nativeDst, 0) != FALSE) {
		    return TCL_OK;
		}
		/*
		 * Still can't copy onto dst.  Return that error, and
		 * restore attributes of dst.
		 */

		TclWinConvertError(GetLastError());
		(*tclWinProcs->setFileAttributesProc)(nativeDst, dstAttr);
	    }
	}
    }
    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpDeleteFile, DoDeleteFile --
 *
 *      Removes a single file (not a directory).
 *
 * Results:
 *	If the file was successfully deleted, returns TCL_OK.  Otherwise
 *	the return value is TCL_ERROR and errno is set to indicate the
 *	error.  Some possible values for errno are:
 *
 *	EACCES:     a parent directory can't be read and/or written.
 *	EISDIR:	    path is a directory.
 *	ENOENT:	    path doesn't exist or is "".
 *
 *	EACCES:     exists an open file already referring to path.
 *	EACCES:	    path is a char device (nul:, com1:, etc.)
 *
 * Side effects:
 *      The file is deleted, even if it is read-only.
 *
 *---------------------------------------------------------------------------
 */

int
TclpDeleteFile(
    CONST char *path)		/* Pathname of file to be removed (UTF-8). */
{
    int result;
    Tcl_DString pathString;

    Tcl_WinUtfToTChar(path, -1, &pathString);
    result = DoDeleteFile(&pathString);
    Tcl_DStringFree(&pathString);
    return result;
}

static int
DoDeleteFile(
    Tcl_DString *pathPtr)	/* Pathname of file to be removed (native). */
{
    DWORD attr;
    CONST TCHAR *nativePath;

    nativePath = (TCHAR *) Tcl_DStringValue(pathPtr);
    
    if ((*tclWinProcs->deleteFileProc)(nativePath) != FALSE) {
	return TCL_OK;
    }
    TclWinConvertError(GetLastError());

    /*
     * Win32s thinks that "" is the same as "." and then reports EISDIR
     * instead of ENOENT.
     */

    if (tclWinProcs->useWide) {
	if (((WCHAR *) nativePath)[0] == '\0') {
	    Tcl_SetErrno(ENOENT);
	    return TCL_ERROR;
	}
    } else {
	if (((char *) nativePath)[0] == '\0') {
	    Tcl_SetErrno(ENOENT);
	    return TCL_ERROR;
	}
    }
    if (Tcl_GetErrno() == EACCES) {
        attr = (*tclWinProcs->getFileAttributesProc)(nativePath);
	if (attr != 0xffffffff) {
	    if (attr & FILE_ATTRIBUTE_DIRECTORY) {
		/*
		 * Windows NT reports removing a directory as EACCES instead
		 * of EISDIR.
		 */

		Tcl_SetErrno(EISDIR);
	    } else if (attr & FILE_ATTRIBUTE_READONLY) {
		(*tclWinProcs->setFileAttributesProc)(nativePath, 
			attr & ~FILE_ATTRIBUTE_READONLY);
		if ((*tclWinProcs->deleteFileProc)(nativePath) != FALSE) {
		    return TCL_OK;
		}
		TclWinConvertError(GetLastError());
		(*tclWinProcs->setFileAttributesProc)(nativePath, attr);
	    }
	}
    } else if (Tcl_GetErrno() == ENOENT) {
        attr = (*tclWinProcs->getFileAttributesProc)(nativePath);
	if (attr != 0xffffffff) {
	    if (attr & FILE_ATTRIBUTE_DIRECTORY) {
	    	/*
		 * Windows 95 reports removing a directory as ENOENT instead 
		 * of EISDIR. 
		 */

		Tcl_SetErrno(EISDIR);
	    }
	}
    } else if (Tcl_GetErrno() == EINVAL) {
	/*
	 * Windows NT reports removing a char device as EINVAL instead of
	 * EACCES.
	 */

	Tcl_SetErrno(EACCES);
    }

    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpCreateDirectory --
 *
 *      Creates the specified directory.  All parent directories of the
 *	specified directory must already exist.  The directory is
 *	automatically created with permissions so that user can access
 *	the new directory and create new files or subdirectories in it.
 *
 * Results:
 *	If the directory was successfully created, returns TCL_OK.
 *	Otherwise the return value is TCL_ERROR and errno is set to
 *	indicate the error.  Some possible values for errno are:
 *
 *	EACCES:     a parent directory can't be read and/or written.
 *	EEXIST:	    path already exists.
 *	ENOENT:	    a parent directory doesn't exist.
 *
 * Side effects:
 *      A directory is created.
 *
 *---------------------------------------------------------------------------
 */

int
TclpCreateDirectory(
    CONST char *path)		/* Pathname of directory to create (UTF-8). */
{
    int result;
    Tcl_DString pathString;

    Tcl_WinUtfToTChar(path, -1, &pathString);
    result = DoCreateDirectory(&pathString);
    Tcl_DStringFree(&pathString);
    return result;
}

static int
DoCreateDirectory(
    Tcl_DString *pathPtr)	/* Pathname of directory to create (native). */
{
    int error;
    CONST TCHAR *nativePath;

    nativePath = (TCHAR *) Tcl_DStringValue(pathPtr);
    if ((*tclWinProcs->createDirectoryProc)(nativePath, NULL) == 0) {
	error = GetLastError();
	TclWinConvertError(error);
	return TCL_ERROR;
    }   
    return TCL_OK;
}

/*
 *---------------------------------------------------------------------------
 *
 * TclpCopyDirectory --
 *
 *      Recursively copies a directory.  The target directory dst must
 *	not already exist.  Note that this function does not merge two
 *	directory hierarchies, even if the target directory is an an
 *	empty directory.
 *
 * Results:
 *	If the directory was successfully copied, returns TCL_OK.
 *	Otherwise the return value is TCL_ERROR, errno is set to indicate
 *	the error, and the pathname of the file that caused the error
 *	is stored in errorPtr.  See TclpCreateDirectory and TclpCopyFile
 *	for a description of possible values for errno.
 *
 * Side effects:
 *      An exact copy of the directory hierarchy src will be created
 *	with the name dst.  If an error occurs, the error will
 *      be returned immediately, and remaining files will not be
 *	processed.
 *
 *---------------------------------------------------------------------------
 */

int
TclpCopyDirectory(
    CONST char *src,		/* Pathname of directory to be copied
				 * (UTF-8). */
    CONST char *dst,		/* Pathname of target directory (UTF-8). */
    Tcl_DString *errorPtr)	/* If non-NULL, uninitialized or free
				 * DString filled with UTF-8 name of file
				 * causing error. */
{
    int result;
    Tcl_DString srcString, dstString;

    Tcl_WinUtfToTChar(src, -1, &srcString);
    Tcl_WinUtfToTChar(dst, -1, &dstString);

    result = TraverseWinTree(TraversalCopy, &srcString, &dstString, errorPtr);

    Tcl_DStringFree(&srcString);
    Tcl_DStringFree(&dstString);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TclpRemoveDirectory, DoRemoveDirectory -- 
 *
 *	Removes directory (and its contents, if the recursive flag is set).
 *
 * Results:
 *	If the directory was successfully removed, returns TCL_OK.
 *	Otherwise the return value is TCL_ERROR, errno is set to indicate
 *	the error, and the pathname of the file that caused the error
 *	is stored in errorPtr.  Some possible values for errno are:
 *
 *	EACCES:     path directory can't be read and/or written.
 *	EEXIST:	    path is a non-empty directory.
 *	EINVAL:	    path is root directory or current directory.
 *	ENOENT:	    path doesn't exist or is "".
 * 	ENOTDIR:    path is not a directory.
 *
 *	EACCES:	    path is a char device (nul:, com1:, etc.) (95)
 *	EINVAL:	    path is a char device (nul:, com1:, etc.) (NT)
 *
 * Side effects:
 *	Directory removed.  If an error occurs, the error will be returned
 *	immediately, and remaining files will not be deleted.
 *
 *----------------------------------------------------------------------
 */

int
TclpRemoveDirectory(
    CONST char *path,		/* Pathname of directory to be removed
				 * (UTF-8). */
    int recursive,		/* If non-zero, removes directories that
				 * are nonempty.  Otherwise, will only remove
				 * empty directories. */
    Tcl_DString *errorPtr)	/* If non-NULL, uninitialized or free
				 * DString filled with UTF-8 name of file
				 * causing error. */
{
    int result;
    Tcl_DString pathString;

    Tcl_WinUtfToTChar(path, -1, &pathString);
    result = DoRemoveDirectory(&pathString, recursive, errorPtr);
    Tcl_DStringFree(&pathString);

    return result;
}

static int
DoRemoveDirectory(
    Tcl_DString *pathPtr,	/* Pathname of directory to be removed
				 * (native). */
    int recursive,		/* If non-zero, removes directories that
				 * are nonempty.  Otherwise, will only remove
				 * empty directories. */
    Tcl_DString *errorPtr)	/* If non-NULL, uninitialized or free
				 * DString filled with UTF-8 name of file
				 * causing error. */
{
    CONST TCHAR *nativePath;
    DWORD attr;

    nativePath = (TCHAR *) Tcl_DStringValue(pathPtr);

    if ((*tclWinProcs->removeDirectoryProc)(nativePath) != FALSE) {
	return TCL_OK;
    }
    TclWinConvertError(GetLastError());

    /*
     * Win32s thinks that "" is the same as "." and then reports EACCES
     * instead of ENOENT.
     */


    if (tclWinProcs->useWide) {
	if (((WCHAR *) nativePath)[0] == '\0') {
	    Tcl_SetErrno(ENOENT);
	    return TCL_ERROR;
	}
    } else {
	if (((char *) nativePath)[0] == '\0') {
	    Tcl_SetErrno(ENOENT);
	    return TCL_ERROR;
	}
    }
    if (Tcl_GetErrno() == EACCES) {
	attr = (*tclWinProcs->getFileAttributesProc)(nativePath);
	if (attr != 0xffffffff) {
	    if ((attr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
		/* 
		 * Windows 95 reports calling RemoveDirectory on a file as an 
		 * EACCES, not an ENOTDIR.
		 */
		
		Tcl_SetErrno(ENOTDIR);
		goto end;
	    }

	    if (attr & FILE_ATTRIBUTE_READONLY) {
		attr &= ~FILE_ATTRIBUTE_READONLY;
		if ((*tclWinProcs->setFileAttributesProc)(nativePath, attr) == FALSE) {
		    goto end;
		}
		if ((*tclWinProcs->removeDirectoryProc)(nativePath) != FALSE) {
		    return TCL_OK;
		}
		TclWinConvertError(GetLastError());
		(*tclWinProcs->setFileAttributesProc)(nativePath, 
			attr | FILE_ATTRIBUTE_READONLY);
	    }

	    /* 
	     * Windows 95 and Win32s report removing a non-empty directory 
	     * as EACCES, not EEXIST.  If the directory is not empty,
	     * change errno so caller knows what's going on.
	     */

	    if (TclWinGetPlatformId() != VER_PLATFORM_WIN32_NT) {
		char *path, *find;
		HANDLE handle;
		WIN32_FIND_DATAA data;
		Tcl_DString buffer;
		int len;

		path = (char *) nativePath;

		Tcl_DStringInit(&buffer);
		len = strlen(path);
		find = Tcl_DStringAppend(&buffer, path, len);
		if ((len > 0) && (find[len - 1] != '\\')) {
		    Tcl_DStringAppend(&buffer, "\\", 1);
		}
		find = Tcl_DStringAppend(&buffer, "*.*", 3);
		handle = FindFirstFileA(find, &data);
		if (handle != INVALID_HANDLE_VALUE) {
		    while (1) {
			if ((strcmp(data.cFileName, ".") != 0)
				&& (strcmp(data.cFileName, "..") != 0)) {
			    /*
			     * Found something in this directory.
			     */

			    Tcl_SetErrno(EEXIST);
			    break;
			}
			if (FindNextFileA(handle, &data) == FALSE) {
			    break;
			}
		    }
		    FindClose(handle);
		}
		Tcl_DStringFree(&buffer);
	    }
	}
    }
    if (Tcl_GetErrno() == ENOTEMPTY) {
	/* 
	 * The caller depends on EEXIST to signify that the directory is
	 * not empty, not ENOTEMPTY. 
	 */

	Tcl_SetErrno(EEXIST);
    }
    if ((recursive != 0) && (Tcl_GetErrno() == EEXIST)) {
	/*
	 * The directory is nonempty, but the recursive flag has been
	 * specified, so we recursively remove all the files in the directory.
	 */

	return TraverseWinTree(TraversalDelete, pathPtr, NULL, errorPtr);
    }
    
    end:
    if (errorPtr != NULL) {
	Tcl_WinTCharToUtf(nativePath, -1, errorPtr);
    }
    return TCL_ERROR;
}

/*
 *---------------------------------------------------------------------------
 *
 * TraverseWinTree --
 *
 *      Traverse directory tree specified by sourcePtr, calling the function 
 *	traverseProc for each file and directory encountered.  If destPtr 
 *	is non-null, each of name in the sourcePtr directory is appended to 
 *	the directory specified by destPtr and passed as the second argument 
 *	to traverseProc() .
 *
 * Results:
 *      Standard Tcl result.
 *
 * Side effects:
 *      None caused by TraverseWinTree, however the user specified 
 *	traverseProc() may change state.  If an error occurs, the error will
 *      be returned immediately, and remaining files will not be processed.
 *
 *---------------------------------------------------------------------------
 */

static int 
TraverseWinTree(
    TraversalProc *traverseProc,/* Function to call for every file and
				 * directory in source hierarchy. */
    Tcl_DString *sourcePtr,	/* Pathname of source directory to be
				 * traversed (native). */
    Tcl_DString *targetPtr,	/* Pathname of directory to traverse in
				 * parallel with source directory (native). */
    Tcl_DString *errorPtr)	/* If non-NULL, uninitialized or free
				 * DString filled with UTF-8 name of file
				 * causing error. */
{
    DWORD sourceAttr;
    TCHAR *nativeSource, *nativeErrfile;
    int result, found, sourceLen, targetLen, oldSourceLen, oldTargetLen;
    HANDLE handle;
    WIN32_FIND_DATAT data;

    nativeErrfile = NULL;
    result = TCL_OK;
    oldTargetLen = 0;		/* lint. */

    nativeSource = (TCHAR *) Tcl_DStringValue(sourcePtr);
    oldSourceLen = Tcl_DStringLength(sourcePtr);
    sourceAttr = (*tclWinProcs->getFileAttributesProc)(nativeSource);
    if (sourceAttr == 0xffffffff) {
	nativeErrfile = nativeSource;
	goto end;
    }
    if ((sourceAttr & FILE_ATTRIBUTE_DIRECTORY) == 0) {
	/*
	 * Process the regular file
	 */

	return (*traverseProc)(sourcePtr, targetPtr, DOTREE_F, errorPtr);
    }

    if (tclWinProcs->useWide) {
	Tcl_DStringAppend(sourcePtr, (char *) L"\\*.*", 4 * sizeof(WCHAR) + 1);
	Tcl_DStringSetLength(sourcePtr, Tcl_DStringLength(sourcePtr) - 1);
    } else {
	Tcl_DStringAppend(sourcePtr, "\\*.*", 4);
    }
    nativeSource = (TCHAR *) Tcl_DStringValue(sourcePtr);
    handle = (*tclWinProcs->findFirstFileProc)(nativeSource, &data);
    if (handle == INVALID_HANDLE_VALUE) {      
	/* 
	 * Can't read directory
	 */

	TclWinConvertError(GetLastError());
	nativeErrfile = nativeSource;
	goto end;
    }

    nativeSource[oldSourceLen + 1] = '\0';
    Tcl_DStringSetLength(sourcePtr, oldSourceLen);
    result = (*traverseProc)(sourcePtr, targetPtr, DOTREE_PRED, errorPtr);
    if (result != TCL_OK) {
	FindClose(handle);
	return result;
    }

    sourceLen = oldSourceLen;

    if (tclWinProcs->useWide) {
	sourceLen += sizeof(WCHAR);
	Tcl_DStringAppend(sourcePtr, (char *) L"\\", sizeof(WCHAR) + 1);
	Tcl_DStringSetLength(sourcePtr, sourceLen);
    } else {
	sourceLen += 1;
	Tcl_DStringAppend(sourcePtr, "\\", 1);
    }
    if (targetPtr != NULL) {
	oldTargetLen = Tcl_DStringLength(targetPtr);

	targetLen = oldTargetLen;
	if (tclWinProcs->useWide) {
	    targetLen += sizeof(WCHAR);
	    Tcl_DStringAppend(targetPtr, (char *) L"\\", sizeof(WCHAR) + 1);
	    Tcl_DStringSetLength(targetPtr, targetLen);
	} else {
	    targetLen += 1;
	    Tcl_DStringAppend(targetPtr, "\\", 1);
	}
    }

    found = 1;
    for ( ; found; found = (*tclWinProcs->findNextFileProc)(handle, &data)) {
	TCHAR *nativeName;
	int len;

	if (tclWinProcs->useWide) {
	    WCHAR *wp;

	    wp = data.w.cFileName;
	    if (*wp == '.') {
		wp++;
		if (*wp == '.') {
		    wp++;
		}
		if (*wp == '\0') {
		    continue;
		}
	    }
	    nativeName = (TCHAR *) data.w.cFileName;
	    len = Tcl_UniCharLen(data.w.cFileName) * sizeof(WCHAR);
	} else {
	    if ((strcmp(data.a.cFileName, ".") == 0) 
		    || (strcmp(data.a.cFileName, "..") == 0)) {
		continue;
	    }
	    nativeName = (TCHAR *) data.a.cFileName;
	    len = strlen(data.a.cFileName);
	}

	/* 
	 * Append name after slash, and recurse on the file. 
	 */

	Tcl_DStringAppend(sourcePtr, (char *) nativeName, len + 1);
	Tcl_DStringSetLength(sourcePtr, Tcl_DStringLength(sourcePtr) - 1);
	if (targetPtr != NULL) {
	    Tcl_DStringAppend(targetPtr, (char *) nativeName, len + 1);
	    Tcl_DStringSetLength(targetPtr, Tcl_DStringLength(targetPtr) - 1);
	}
	result = TraverseWinTree(traverseProc, sourcePtr, targetPtr, 
		errorPtr);
	if (result != TCL_OK) {
	    break;
	}

	/*
	 * Remove name after slash.
	 */

	Tcl_DStringSetLength(sourcePtr, sourceLen);
	if (targetPtr != NULL) {
	    Tcl_DStringSetLength(targetPtr, targetLen);
	}
    }
    FindClose(handle);

    /*
     * Strip off the trailing slash we added
     */

    Tcl_DStringSetLength(sourcePtr, oldSourceLen + 1);
    Tcl_DStringSetLength(sourcePtr, oldSourceLen);
    if (targetPtr != NULL) {
	Tcl_DStringSetLength(targetPtr, oldTargetLen + 1);
	Tcl_DStringSetLength(targetPtr, oldTargetLen);
    }
    if (result == TCL_OK) {
	/*
	 * Call traverseProc() on a directory after visiting all the
	 * files in that directory.
	 */

	result = (*traverseProc)(sourcePtr, targetPtr, DOTREE_POSTD, 
		errorPtr);
    }
    end:
    if (nativeErrfile != NULL) {
	TclWinConvertError(GetLastError());
	if (errorPtr != NULL) {
	    Tcl_WinTCharToUtf(nativeErrfile, -1, errorPtr);
	}
	result = TCL_ERROR;
    }
	    
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TraversalCopy
 *
 *      Called from TraverseUnixTree in order to execute a recursive
 *      copy of a directory.
 *
 * Results:
 *      Standard Tcl result.
 *
 * Side effects:
 *      Depending on the value of type, src may be copied to dst.
 *      
 *----------------------------------------------------------------------
 */

static int 
TraversalCopy(
    Tcl_DString *srcPtr,	/* Source pathname to copy. */
    Tcl_DString *dstPtr,	/* Destination pathname of copy. */
    int type,			/* Reason for call - see TraverseWinTree() */
    Tcl_DString *errorPtr)	/* If non-NULL, initialized DString filled
				 * with UTF-8 name of file causing error. */
{
    TCHAR *nativeDst, *nativeSrc;
    DWORD attr;

    switch (type) {
	case DOTREE_F: {
	    if (DoCopyFile(srcPtr, dstPtr) == TCL_OK) {
		return TCL_OK;
	    }
	    break;
	}
	case DOTREE_PRED: {
	    if (DoCreateDirectory(dstPtr) == TCL_OK) {
		nativeSrc = (TCHAR *) Tcl_DStringValue(srcPtr);
		nativeDst = (TCHAR *) Tcl_DStringValue(dstPtr);
		attr = (*tclWinProcs->getFileAttributesProc)(nativeSrc);
		if ((*tclWinProcs->setFileAttributesProc)(nativeDst, attr) != FALSE) {
		    return TCL_OK;
		}
		TclWinConvertError(GetLastError());
	    }
	    break;
	}
        case DOTREE_POSTD: {
	    return TCL_OK;
	}
    }

    /*
     * There shouldn't be a problem with src, because we already
     * checked it to get here.
     */

    if (errorPtr != NULL) {
	nativeDst = (TCHAR *) Tcl_DStringValue(dstPtr);
	Tcl_WinTCharToUtf(nativeDst, -1, errorPtr);
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * TraversalDelete --
 *
 *      Called by procedure TraverseWinTree for every file and
 *      directory that it encounters in a directory hierarchy. This
 *      procedure unlinks files, and removes directories after all the
 *      containing files have been processed.
 *
 * Results:
 *      Standard Tcl result.
 *
 * Side effects:
 *      Files or directory specified by src will be deleted. If an
 *      error occurs, the windows error is converted to a Posix error
 *      and errno is set accordingly.
 *
 *----------------------------------------------------------------------
 */

static int
TraversalDelete( 
    Tcl_DString *srcPtr,	/* Source pathname to delete. */
    Tcl_DString *dstPtr,	/* Not used. */
    int type,			/* Reason for call - see TraverseWinTree() */
    Tcl_DString *errorPtr)	/* If non-NULL, initialized DString filled
				 * with UTF-8 name of file causing error. */
{
    TCHAR *nativeSrc;

    switch (type) {
	case DOTREE_F: {
	    if (DoDeleteFile(srcPtr) == TCL_OK) {
		return TCL_OK;
	    }
	    break;
	}
	case DOTREE_PRED: {
	    return TCL_OK;
	}
	case DOTREE_POSTD: {
	    if (DoRemoveDirectory(srcPtr, 0, NULL) == TCL_OK) {
		return TCL_OK;
	    }
	    break;
	}
    }

    if (errorPtr != NULL) {
	nativeSrc = (TCHAR *) Tcl_DStringValue(srcPtr);
	Tcl_WinTCharToUtf(nativeSrc, -1, errorPtr);
    }
    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------
 *
 * StatError --
 *
 *	Sets the object result with the appropriate error.
 *
 * Results:
 *      None.
 *
 * Side effects:
 *      The interp's object result is set with an error message
 *	based on the objIndex, fileName and errno.
 *
 *----------------------------------------------------------------------
 */

static void
StatError(
    Tcl_Interp *interp,		/* The interp that has the error */
    CONST char *fileName)	/* The name of the file which caused the 
				 * error. */
{
    TclWinConvertError(GetLastError());
    Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), 
	    "could not read \"", fileName, "\": ", Tcl_PosixError(interp), 
	    (char *) NULL);
}

/*
 *----------------------------------------------------------------------
 *
 * GetWinFileAttributes --
 *
 *      Returns a Tcl_Obj containing the value of a file attribute.
 *	This routine gets the -hidden, -readonly or -system attribute.
 *
 * Results:
 *      Standard Tcl result and a Tcl_Obj in attributePtrPtr. The object
 *	will have ref count 0. If the return value is not TCL_OK,
 *	attributePtrPtr is not touched.
 *
 * Side effects:
 *      A new object is allocated if the file is valid.
 *
 *----------------------------------------------------------------------
 */

static int
GetWinFileAttributes(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    CONST char *fileName,	/* The name of the file. */
    Tcl_Obj **attributePtrPtr)	/* A pointer to return the object with. */
{
    DWORD result;
    Tcl_DString ds;
    TCHAR *nativeName;

    nativeName = Tcl_WinUtfToTChar(fileName, -1, &ds);
    result = (*tclWinProcs->getFileAttributesProc)(nativeName);
    Tcl_DStringFree(&ds);

    if (result == 0xffffffff) {
	StatError(interp, fileName);
	return TCL_ERROR;
    }

    *attributePtrPtr = Tcl_NewBooleanObj(result & attributeArray[objIndex]);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * ConvertFileNameFormat --
 *
 *      Returns a Tcl_Obj containing either the long or short version of the 
 *	file name.
 *
 * Results:
 *      Standard Tcl result and a Tcl_Obj in attributePtrPtr. The object
 *	will have ref count 0. If the return value is not TCL_OK,
 *	attributePtrPtr is not touched.
 *
 * Side effects:
 *      A new object is allocated if the file is valid.
 *
 *----------------------------------------------------------------------
 */

static int
ConvertFileNameFormat(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    CONST char *fileName,	/* The name of the file. */
    int longShort,		/* 0 to short name, 1 to long name. */
    Tcl_Obj **attributePtrPtr)	/* A pointer to return the object with. */
{
    int pathc, i;
    char **pathv, **newv;
    char *resultStr;
    Tcl_DString resultDString;
    int result = TCL_OK;

    Tcl_SplitPath(fileName, &pathc, &pathv);
    newv = (char **) ckalloc(pathc * sizeof(char *));

    if (pathc == 0) {
	Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), 
		"could not read \"", fileName,
		"\": no such file or directory", 
		(char *) NULL);
	result = TCL_ERROR;
	goto cleanup;
    }
    
    for (i = 0; i < pathc; i++) {
	if ((pathv[i][0] == '/')
		|| ((strlen(pathv[i]) == 3) && (pathv[i][1] == ':'))
		|| (strcmp(pathv[i], ".") == 0)
		|| (strcmp(pathv[i], "..") == 0)) {
	    /*
	     * Handle "/", "//machine/export", "c:/", "." or ".." by just
	     * copying the string literally.  Uppercase the drive letter,
	     * just because it looks better under Windows to do so.
	     */

	    simple:
	    pathv[i][0] = (char) Tcl_UniCharToUpper(UCHAR(pathv[i][0]));
	    newv[i] = (char *) ckalloc(strlen(pathv[i]) + 1);
	    lstrcpyA(newv[i], pathv[i]);
	} else {
	    char *str;
	    TCHAR *nativeName;
	    Tcl_DString ds;
	    WIN32_FIND_DATAT data;
	    HANDLE handle;
	    DWORD attr;

	    Tcl_DStringInit(&resultDString);
	    str = Tcl_JoinPath(i + 1, pathv, &resultDString);
	    nativeName = Tcl_WinUtfToTChar(str, -1, &ds);
	    handle = (*tclWinProcs->findFirstFileProc)(nativeName, &data);
	    if (handle == INVALID_HANDLE_VALUE) {
		/*
		 * FindFirstFile() doesn't like root directories.  We 
		 * would only get a root directory here if the caller
		 * specified "c:" or "c:." and the current directory on the
		 * drive was the root directory
		 */

		attr = (*tclWinProcs->getFileAttributesProc)(nativeName);
		if ((attr != 0xFFFFFFFF) && (attr & FILE_ATTRIBUTE_DIRECTORY)) {
		    Tcl_DStringFree(&ds);
		    Tcl_DStringFree(&resultDString);

		    goto simple;
		}
	    }
	    Tcl_DStringFree(&ds);
	    Tcl_DStringFree(&resultDString);

	    if (handle == INVALID_HANDLE_VALUE) {
		pathc = i - 1;
		StatError(interp, fileName);
		result = TCL_ERROR;
		goto cleanup;
	    }
	    if (tclWinProcs->useWide) {
		nativeName = (TCHAR *) data.w.cAlternateFileName;
		if (longShort) {
		    if (data.w.cFileName[0] != '\0') {
			nativeName = (TCHAR *) data.w.cFileName;
		    } 
		} else {
		    if (data.w.cAlternateFileName[0] == '\0') {
			nativeName = (TCHAR *) data.w.cFileName;
		    }
		}
	    } else {
		nativeName = (TCHAR *) data.a.cAlternateFileName;
		if (longShort) {
		    if (data.a.cFileName[0] != '\0') {
			nativeName = (TCHAR *) data.a.cFileName;
		    } 
		} else {
		    if (data.a.cAlternateFileName[0] == '\0') {
			nativeName = (TCHAR *) data.a.cFileName;
		    }
		}
	    }

	    /*
	     * Purify reports a extraneous UMR in Tcl_WinTCharToUtf() trying 
	     * to dereference nativeName as a Unicode string.  I have proven 
	     * to myself that purify is wrong by running the following 
	     * example when nativeName == data.w.cAlternateFileName and 
	     * noting that purify doesn't complain about the first line,
	     * but does complain about the second.
	     *
	     *	fprintf(stderr, "%d\n", data.w.cAlternateFileName[0]);
	     *	fprintf(stderr, "%d\n", ((WCHAR *) nativeName)[0]);
	     */

	    Tcl_WinTCharToUtf(nativeName, -1, &ds);
	    newv[i] = ckalloc(Tcl_DStringLength(&ds) + 1);
	    lstrcpyA(newv[i], Tcl_DStringValue(&ds));
	    Tcl_DStringFree(&ds);
	    FindClose(handle);
	}
    }

    Tcl_DStringInit(&resultDString);
    resultStr = Tcl_JoinPath(pathc, newv, &resultDString);
    *attributePtrPtr = Tcl_NewStringObj(resultStr, 
	    Tcl_DStringLength(&resultDString));
    Tcl_DStringFree(&resultDString);

cleanup:
    for (i = 0; i < pathc; i++) {
	ckfree(newv[i]);
    }
    ckfree((char *) newv);
    ckfree((char *) pathv);
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * GetWinFileLongName --
 *
 *      Returns a Tcl_Obj containing the short version of the file
 *	name.
 *
 * Results:
 *      Standard Tcl result and a Tcl_Obj in attributePtrPtr. The object
 *	will have ref count 0. If the return value is not TCL_OK,
 *	attributePtrPtr is not touched.
 *
 * Side effects:
 *      A new object is allocated if the file is valid.
 *
 *----------------------------------------------------------------------
 */

static int
GetWinFileLongName(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    CONST char *fileName,	/* The name of the file. */
    Tcl_Obj **attributePtrPtr)	/* A pointer to return the object with. */
{
    return ConvertFileNameFormat(interp, objIndex, fileName, 1, attributePtrPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * GetWinFileShortName --
 *
 *      Returns a Tcl_Obj containing the short version of the file
 *	name.
 *
 * Results:
 *      Standard Tcl result and a Tcl_Obj in attributePtrPtr. The object
 *	will have ref count 0. If the return value is not TCL_OK,
 *	attributePtrPtr is not touched.
 *
 * Side effects:
 *      A new object is allocated if the file is valid.
 *
 *----------------------------------------------------------------------
 */

static int
GetWinFileShortName(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    CONST char *fileName,	/* The name of the file. */
    Tcl_Obj **attributePtrPtr)	/* A pointer to return the object with. */
{
    return ConvertFileNameFormat(interp, objIndex, fileName, 0, attributePtrPtr);
}

/*
 *----------------------------------------------------------------------
 *
 * SetWinFileAttributes --
 *
 *	Set the file attributes to the value given by attributePtr.
 *	This routine sets the -hidden, -readonly, or -system attributes.
 *
 * Results:
 *      Standard TCL error.
 *
 * Side effects:
 *      The file's attribute is set.
 *
 *----------------------------------------------------------------------
 */

static int
SetWinFileAttributes(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    CONST char *fileName,	/* The name of the file. */
    Tcl_Obj *attributePtr)	/* The new value of the attribute. */
{
    DWORD fileAttributes;
    int yesNo;
    int result;
    Tcl_DString ds;
    TCHAR *nativeName;

    nativeName = Tcl_WinUtfToTChar(fileName, -1, &ds);
    fileAttributes = (*tclWinProcs->getFileAttributesProc)(nativeName);

    if (fileAttributes == 0xffffffff) {
	StatError(interp, fileName);
	result = TCL_ERROR;
	goto end;
    }

    result = Tcl_GetBooleanFromObj(interp, attributePtr, &yesNo);
    if (result != TCL_OK) {
	goto end;
    }

    if (yesNo) {
	fileAttributes |= (attributeArray[objIndex]);
    } else {
	fileAttributes &= ~(attributeArray[objIndex]);
    }

    if (!(*tclWinProcs->setFileAttributesProc)(nativeName, fileAttributes)) {
	StatError(interp, fileName);
	result = TCL_ERROR;
	goto end;
    }

    end:
    Tcl_DStringFree(&ds);

    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * SetWinFileLongName --
 *
 *	The attribute in question is a readonly attribute and cannot
 *	be set.
 *
 * Results:
 *      TCL_ERROR
 *
 * Side effects:
 *      The object result is set to a pertinant error message.
 *
 *----------------------------------------------------------------------
 */

static int
CannotSetAttribute(
    Tcl_Interp *interp,		/* The interp we are using for errors. */
    int objIndex,		/* The index of the attribute. */
    CONST char *fileName,	/* The name of the file. */
    Tcl_Obj *attributePtr)	/* The new value of the attribute. */
{
    Tcl_AppendStringsToObj(Tcl_GetObjResult(interp), 
	    "cannot set attribute \"", tclpFileAttrStrings[objIndex],
	    "\" for file \"", fileName, "\": attribute is readonly", 
	    (char *) NULL);
    return TCL_ERROR;
}


/*
 *---------------------------------------------------------------------------
 *
 * TclpListVolumes --
 *
 *	Lists the currently mounted volumes
 *
 * Results:
 *	A standard Tcl result.  Will always be TCL_OK, since there is no way
 *	that this command can fail.  Also, the interpreter's result is set to 
 *	the list of volumes.
 *
 * Side effects:
 *	None
 *
 *---------------------------------------------------------------------------
 */

int
TclpListVolumes( 
    Tcl_Interp *interp)		/* Interpreter for returning volume list. */
{
    Tcl_Obj *resultPtr, *elemPtr;
    char buf[40 * 4];		/* There couldn't be more than 30 drives??? */
    int i;
    char *p;

    resultPtr = Tcl_GetObjResult(interp);

    /*
     * On Win32s:
     * GetLogicalDriveStrings() isn't implemented.
     * GetLogicalDrives() returns incorrect information.
     */

    if (GetLogicalDriveStringsA(sizeof(buf), buf) == 0) {
	/*
	 * GetVolumeInformation() will detects all drives, but causes
	 * chattering on empty floppy drives.  We only do this if 
	 * GetLogicalDriveStrings() didn't work.  It has also been reported
	 * that on some laptops it takes a while for GetVolumeInformation()
	 * to return when pinging an empty floppy drive, another reason to 
	 * try to avoid calling it.
	 */

	buf[1] = ':';
	buf[2] = '/';
	buf[3] = '\0';

	for (i = 0; i < 26; i++) {
	    buf[0] = (char) ('a' + i);
	    if (GetVolumeInformationA(buf, NULL, 0, NULL, NULL, NULL, NULL, 0)  
		    || (GetLastError() == ERROR_NOT_READY)) {
		elemPtr = Tcl_NewStringObj(buf, -1);
		Tcl_ListObjAppendElement(NULL, resultPtr, elemPtr);
	    }
	}
    } else {
	for (p = buf; *p != '\0'; p += 4) {
	    p[2] = '/';
	    elemPtr = Tcl_NewStringObj(p, -1);
	    Tcl_ListObjAppendElement(NULL, resultPtr, elemPtr);
	}
    }
    return TCL_OK;	
}
