Merge 8.7

16 files changed, 192 insertions, 193 deletions

diff --git a/generic/tclEncoding.c b/generic/tclEncoding.c
index 14efadb..222f11d 100644
--- a/generic/tclEncoding.c
+++ b/generic/tclEncoding.c
@@ -234,12 +234,12 @@ static int		TableToUtfProc(ClientData clientData, const char *src,
 			    char *dst, int dstLen, int *srcReadPtr,
 			    int *dstWrotePtr, int *dstCharsPtr);
 static size_t		unilen(const char *src);
-static int		UnicodeToUtfProc(ClientData clientData,
+static int		UniCharToUtfProc(ClientData clientData,
 			    const char *src, int srcLen, int flags,
 			    Tcl_EncodingState *statePtr, char *dst, int dstLen,
 			    int *srcReadPtr, int *dstWrotePtr,
 			    int *dstCharsPtr);
-static int		UtfToUnicodeProc(ClientData clientData,
+static int		UtfToUniCharProc(ClientData clientData,
 			    const char *src, int srcLen, int flags,
 			    Tcl_EncodingState *statePtr, char *dst, int dstLen,
 			    int *srcReadPtr, int *dstWrotePtr,
@@ -596,8 +596,8 @@ TclInitEncodingSubsystem(void)
     Tcl_CreateEncoding(&type);
 
     type.encodingName   = "unicode";
-    type.toUtfProc	= UnicodeToUtfProc;
-    type.fromUtfProc    = UtfToUnicodeProc;
+    type.toUtfProc	= UniCharToUtfProc;
+    type.fromUtfProc    = UtfToUniCharProc;
     type.freeProc	= NULL;
     type.nullSize	= 2;
     type.clientData	= NULL;
@@ -2339,7 +2339,7 @@ UtfToUtfProc(
 /*
  *-------------------------------------------------------------------------
  *
- * UnicodeToUtfProc --
+ * UniCharToUtfProc --
  *
  *	Convert from Unicode to UTF-8.
  *
@@ -2353,7 +2353,7 @@ UtfToUtfProc(
  */
 
 static int
-UnicodeToUtfProc(
+UniCharToUtfProc(
     ClientData clientData,	/* Not used. */
     const char *src,		/* Source string in Unicode. */
     int srcLen,			/* Source string length in bytes. */
@@ -2429,7 +2429,7 @@ UnicodeToUtfProc(
 /*
  *-------------------------------------------------------------------------
  *
- * UtfToUnicodeProc --
+ * UtfToUniCharProc --
  *
  *	Convert from UTF-8 to Unicode.
  *
@@ -2443,7 +2443,7 @@ UnicodeToUtfProc(
  */
 
 static int
-UtfToUnicodeProc(
+UtfToUniCharProc(
     ClientData clientData,	/* TableEncodingData that specifies
 				 * encoding. */
     const char *src,		/* Source string in UTF-8. */
diff --git a/generic/tclIOUtil.c b/generic/tclIOUtil.c
index c366af9..33507ac 100644
--- a/generic/tclIOUtil.c
+++ b/generic/tclIOUtil.c
@@ -4700,7 +4700,7 @@ Tcl_FSGetFileSystemForPath(
  * Tcl_FSGetNativePath --
  *
  *	This function is for use by the Win/Unix native filesystems, so that
- *	they can easily retrieve the native (char* or TCHAR*) representation
+ *	they can easily retrieve the native (char* or WCHAR*) representation
  *	of a path. Other filesystems will probably want to implement similar
  *	functions. They basically act as a safety net around
  *	Tcl_FSGetInternalRep. Normally your file-system functions will always
diff --git a/generic/tclStringObj.c b/generic/tclStringObj.c
index 2635583..6a0d796 100644
--- a/generic/tclStringObj.c
+++ b/generic/tclStringObj.c
@@ -1944,7 +1944,7 @@ Tcl_AppendFormatToObj(
 	    }
 	    break;
 	case 'c': {
-	    char buf[4];
+	    char buf[TCL_UTF_MAX] = "";
 	    int code, length;
 
 	    if (TclGetIntFromObj(interp, segment, &code) != TCL_OK) {
diff --git a/generic/tclStubInit.c b/generic/tclStubInit.c
index b00b233..b9efe22 100644
--- a/generic/tclStubInit.c
+++ b/generic/tclStubInit.c
@@ -122,7 +122,7 @@ Tcl_WinUtfToTChar(
     if (!string) {
 	return NULL;
     }
-    return (char *)Tcl_UtfToWCharDString(string, len, dsPtr);
+    return (char *)TclUtfToWCharDString(string, len, dsPtr);
 }
 
 char *
@@ -140,7 +140,7 @@ Tcl_WinTCharToUtf(
     } else {
 	len /= 2;
     }
-    return TclWCharToUtfDString((Tcl_UniChar *)string, len, dsPtr);
+    return TclWCharToUtfDString((const WCHAR *)string, len, dsPtr);
 }
 
 #if defined(TCL_WIDE_INT_IS_LONG)
diff --git a/generic/tclZipfs.c b/generic/tclZipfs.c
index 2322ba6..c831143 100644
--- a/generic/tclZipfs.c
+++ b/generic/tclZipfs.c
@@ -4833,7 +4833,7 @@ int
 TclZipfs_AppHook(
     int *argcPtr,		/* Pointer to argc */
 #ifdef _WIN32
-    TCHAR
+    WCHAR
 #else /* !_WIN32 */
     char
 #endif /* _WIN32 */
diff --git a/unix/tclUnixChan.c b/unix/tclUnixChan.c
index 29fc03e..d76be4e 100644
--- a/unix/tclUnixChan.c
+++ b/unix/tclUnixChan.c
@@ -654,17 +654,15 @@ TtySetOptionProc(
      */
 
     if ((len > 1) && (strncmp(optionName, "-xchar", len) == 0)) {
-	Tcl_DString ds;
-
 	if (Tcl_SplitList(interp, value, &argc, &argv) == TCL_ERROR) {
 	    return TCL_ERROR;
 	} else if (argc != 2) {
+	badXchar:
 	    if (interp) {
 		Tcl_SetObjResult(interp, Tcl_NewStringObj(
 			"bad value for -xchar: should be a list of"
-			" two elements", -1));
-		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "FCONFIGURE",
-			"VALUE", NULL);
+			" two elements with each a single 8-bit character", -1));
+		Tcl_SetErrorCode(interp, "TCL", "VALUE", "XCHAR", NULL);
 	    }
 	    Tcl_Free(argv);
 	    return TCL_ERROR;
@@ -672,13 +670,23 @@ TtySetOptionProc(
 
 	tcgetattr(fsPtr->fd, &iostate);
 
-	Tcl_UtfToExternalDString(NULL, argv[0], -1, &ds);
-	iostate.c_cc[VSTART] = *(const cc_t *) Tcl_DStringValue(&ds);
-	TclDStringClear(&ds);
+	iostate.c_cc[VSTART] = argv[0][0];
+	iostate.c_cc[VSTOP] = argv[1][0];
+	if (argv[0][0] & 0x80 || argv[1][0] & 0x80) {
+	    Tcl_UniChar character = 0;
+	    int charLen;
 
-	Tcl_UtfToExternalDString(NULL, argv[1], -1, &ds);
-	iostate.c_cc[VSTOP] = *(const cc_t *) Tcl_DStringValue(&ds);
-	Tcl_DStringFree(&ds);
+	    charLen = Tcl_UtfToUniChar(argv[0], &character);
+	    if ((character > 0xFF) || argv[0][charLen]) {
+		goto badXchar;
+	    }
+	    iostate.c_cc[VSTART] = character;
+	    charLen = Tcl_UtfToUniChar(argv[1], &character);
+	    if ((character > 0xFF) || argv[1][charLen]) {
+		goto badXchar;
+	    }
+	    iostate.c_cc[VSTOP] = character;
+	}
 	Tcl_Free(argv);
 
 	tcsetattr(fsPtr->fd, TCSADRAIN, &iostate);
diff --git a/win/tclWin32Dll.c b/win/tclWin32Dll.c
index aee41c6..915f9a3 100644
--- a/win/tclWin32Dll.c
+++ b/win/tclWin32Dll.c
@@ -46,8 +46,8 @@ BOOL APIENTRY		DllMain(HINSTANCE hInst, DWORD reason,
  */
 
 typedef struct MountPointMap {
-    TCHAR *volumeName;		/* Native wide string volume name. */
-    TCHAR driveLetter;		/* Drive letter corresponding to the volume
+    WCHAR *volumeName;		/* Native wide string volume name. */
+    WCHAR driveLetter;		/* Drive letter corresponding to the volume
 				 * name. */
     struct MountPointMap *nextPtr;
 				/* Pointer to next structure in list, or
@@ -286,11 +286,11 @@ TclWinEncodingsCleanup(void)
 
 char
 TclWinDriveLetterForVolMountPoint(
-    const TCHAR *mountPoint)
+    const WCHAR *mountPoint)
 {
     MountPointMap *dlIter, *dlPtr2;
-    TCHAR Target[55];		/* Target of mount at mount point */
-    TCHAR drive[4] = TEXT("A:\\");
+    WCHAR Target[55];		/* Target of mount at mount point */
+    WCHAR drive[4] = TEXT("A:\\");
 
     /*
      * Detect the volume mounted there. Unfortunately, there is no simple way
@@ -301,14 +301,14 @@ TclWinDriveLetterForVolMountPoint(
     Tcl_MutexLock(&mountPointMap);
     dlIter = driveLetterLookup;
     while (dlIter != NULL) {
-	if (_tcscmp(dlIter->volumeName, mountPoint) == 0) {
+	if (wcscmp(dlIter->volumeName, mountPoint) == 0) {
 	    /*
 	     * We need to check whether this information is still valid, since
 	     * either the user or various programs could have adjusted the
 	     * mount points on the fly.
 	     */
 
-	    drive[0] = (TCHAR) dlIter->driveLetter;
+	    drive[0] = (WCHAR) dlIter->driveLetter;
 
 	    /*
 	     * Try to read the volume mount point and see where it points.
@@ -316,7 +316,7 @@ TclWinDriveLetterForVolMountPoint(
 
 	    if (GetVolumeNameForVolumeMountPoint(drive,
 		    Target, 55) != 0) {
-		if (_tcscmp(dlIter->volumeName, Target) == 0) {
+		if (wcscmp(dlIter->volumeName, Target) == 0) {
 		    /*
 		     * Nothing has changed.
 		     */
@@ -379,7 +379,7 @@ TclWinDriveLetterForVolMountPoint(
 
 	    for (dlIter = driveLetterLookup; dlIter != NULL;
 		    dlIter = dlIter->nextPtr) {
-		if (_tcscmp(dlIter->volumeName, Target) == 0) {
+		if (wcscmp(dlIter->volumeName, Target) == 0) {
 		    alreadyStored = 1;
 		    break;
 		}
@@ -400,7 +400,7 @@ TclWinDriveLetterForVolMountPoint(
 
     for (dlIter = driveLetterLookup; dlIter != NULL;
 	    dlIter = dlIter->nextPtr) {
-	if (_tcscmp(dlIter->volumeName, mountPoint) == 0) {
+	if (wcscmp(dlIter->volumeName, mountPoint) == 0) {
 	    Tcl_MutexUnlock(&mountPointMap);
 	    return (char) dlIter->driveLetter;
 	}
@@ -447,7 +447,7 @@ TclWinDriveLetterForVolMountPoint(
  *		nativeBuffer <- UtfToExternal(encoding, utfBuffer);
  *		Tcl_FreeEncoding(encoding);
  *
- *	By convention, in Windows a TCHAR is a Unicode character. If you plan
+ *	By convention, in Windows a WCHAR is a Unicode character. If you plan
  *	on targeting a Unicode interface when running on Windows, these
  *	functions should be used. If you plan on targetting a "char" oriented
  *	function on Windows, use Tcl_UtfToExternal() with an encoding of NULL.
@@ -463,7 +463,7 @@ TclWinDriveLetterForVolMountPoint(
  *---------------------------------------------------------------------------
  */
 
-TCHAR *
+WCHAR *
 Tcl_WinUtfToTChar(
     const char *string,		/* Source string in UTF-8. */
     size_t len,			/* Source string length in bytes, or -1
diff --git a/win/tclWinChan.c b/win/tclWinChan.c
index 421ae50..739d595 100644
--- a/win/tclWinChan.c
+++ b/win/tclWinChan.c
@@ -96,7 +96,7 @@ static void		FileThreadActionProc(ClientData instanceData,
 static int		FileTruncateProc(ClientData instanceData,
 			    Tcl_WideInt length);
 static DWORD		FileGetType(HANDLE handle);
-static int		NativeIsComPort(const TCHAR *nativeName);
+static int		NativeIsComPort(const WCHAR *nativeName);
 
 /*
  * This structure describes the channel type structure for file based IO.
@@ -849,7 +849,7 @@ TclpOpenFileChannel(
     Tcl_Channel channel = 0;
     int channelPermissions = 0;
     DWORD accessMode = 0, createMode, shareMode, flags;
-    const TCHAR *nativeName;
+    const WCHAR *nativeName;
     HANDLE handle;
     char channelName[16 + TCL_INTEGER_SPACE];
     TclFile readFile = NULL, writeFile = NULL;
@@ -1557,7 +1557,7 @@ FileGetType(
 
 static int
 NativeIsComPort(
-    const TCHAR *nativePath)	/* Path of file to access, native encoding. */
+    const WCHAR *nativePath)	/* Path of file to access, native encoding. */
 {
     const WCHAR *p = (const WCHAR *) nativePath;
     int i, len = wcslen(p);
diff --git a/win/tclWinFCmd.c b/win/tclWinFCmd.c
index 1465549..e3aca91 100644
--- a/win/tclWinFCmd.c
+++ b/win/tclWinFCmd.c
@@ -71,7 +71,7 @@ const TclFileAttrProcs tclpFileAttrProcs[] = {
  * Prototype for the TraverseWinTree callback function.
  */
 
-typedef int (TraversalProc)(const TCHAR *srcPtr, const TCHAR *dstPtr,
+typedef int (TraversalProc)(const WCHAR *srcPtr, const WCHAR *dstPtr,
 	int type, Tcl_DString *errorPtr);
 
 /*
@@ -82,18 +82,18 @@ static void		StatError(Tcl_Interp *interp, Tcl_Obj *fileName);
 static int		ConvertFileNameFormat(Tcl_Interp *interp,
 			    int objIndex, Tcl_Obj *fileName, int longShort,
 			    Tcl_Obj **attributePtrPtr);
-static int		DoCopyFile(const TCHAR *srcPtr, const TCHAR *dstPtr);
-static int		DoCreateDirectory(const TCHAR *pathPtr);
-static int		DoRemoveJustDirectory(const TCHAR *nativeSrc,
+static int		DoCopyFile(const WCHAR *srcPtr, const WCHAR *dstPtr);
+static int		DoCreateDirectory(const WCHAR *pathPtr);
+static int		DoRemoveJustDirectory(const WCHAR *nativeSrc,
 			    int ignoreError, Tcl_DString *errorPtr);
 static int		DoRemoveDirectory(Tcl_DString *pathPtr, int recursive,
 			    Tcl_DString *errorPtr);
-static int		DoRenameFile(const TCHAR *nativeSrc,
-			    const TCHAR *dstPtr);
-static int		TraversalCopy(const TCHAR *srcPtr, const TCHAR *dstPtr,
+static int		DoRenameFile(const WCHAR *nativeSrc,
+			    const WCHAR *dstPtr);
+static int		TraversalCopy(const WCHAR *srcPtr, const WCHAR *dstPtr,
 			    int type, Tcl_DString *errorPtr);
-static int		TraversalDelete(const TCHAR *srcPtr,
-			    const TCHAR *dstPtr, int type,
+static int		TraversalDelete(const WCHAR *srcPtr,
+			    const WCHAR *dstPtr, int type,
 			    Tcl_DString *errorPtr);
 static int		TraverseWinTree(TraversalProc *traverseProc,
 			    Tcl_DString *sourcePtr, Tcl_DString *dstPtr,
@@ -151,9 +151,9 @@ TclpObjRenameFile(
 
 static int
 DoRenameFile(
-    const TCHAR *nativeSrc,	/* Pathname of file or dir to be renamed
+    const WCHAR *nativeSrc,	/* Pathname of file or dir to be renamed
 				 * (native). */
-    const TCHAR *nativeDst)	/* New pathname for file or directory
+    const WCHAR *nativeDst)	/* New pathname for file or directory
 				 * (native). */
 {
 #if defined(HAVE_NO_SEH) && !defined(_WIN64)
@@ -307,11 +307,11 @@ DoRenameFile(
     if (errno == EACCES) {
     decode:
 	if (srcAttr & FILE_ATTRIBUTE_DIRECTORY) {
-	    TCHAR *nativeSrcRest, *nativeDstRest;
+	    WCHAR *nativeSrcRest, *nativeDstRest;
 	    const char **srcArgv, **dstArgv;
 	    int size, srcArgc, dstArgc;
-	    TCHAR nativeSrcPath[MAX_PATH];
-	    TCHAR nativeDstPath[MAX_PATH];
+	    WCHAR nativeSrcPath[MAX_PATH];
+	    WCHAR nativeDstPath[MAX_PATH];
 	    Tcl_DString srcString, dstString;
 	    const char *src, *dst;
 
@@ -445,20 +445,20 @@ DoRenameFile(
 		 *    back to old name.
 		 */
 
-		TCHAR *nativeRest, *nativeTmp, *nativePrefix;
+		WCHAR *nativeRest, *nativeTmp, *nativePrefix;
 		int result, size;
-		TCHAR tempBuf[MAX_PATH];
+		WCHAR tempBuf[MAX_PATH];
 
 		size = GetFullPathName(nativeDst, MAX_PATH,
 			tempBuf, &nativeRest);
 		if ((size == 0) || (size > MAX_PATH) || (nativeRest == NULL)) {
 		    return TCL_ERROR;
 		}
-		nativeTmp = (TCHAR *) tempBuf;
+		nativeTmp = (WCHAR *) tempBuf;
 		nativeRest[0] = L'\0';
 
 		result = TCL_ERROR;
-		nativePrefix = (TCHAR *) L"tclr";
+		nativePrefix = (WCHAR *) L"tclr";
 		if (GetTempFileName(nativeTmp, nativePrefix,
 			0, tempBuf) != 0) {
 		    /*
@@ -540,8 +540,8 @@ TclpObjCopyFile(
 
 static int
 DoCopyFile(
-    const TCHAR *nativeSrc,	/* Pathname of file to be copied (native). */
-    const TCHAR *nativeDst)	/* Pathname of file to copy to (native). */
+    const WCHAR *nativeSrc,	/* Pathname of file to be copied (native). */
+    const WCHAR *nativeDst)	/* Pathname of file to copy to (native). */
 {
 #if defined(HAVE_NO_SEH) && !defined(_WIN64)
     TCLEXCEPTION_REGISTRATION registration;
@@ -749,7 +749,7 @@ TclpDeleteFile(
     const void *nativePath)	/* Pathname of file to be removed (native). */
 {
     DWORD attr;
-    const TCHAR *path = nativePath;
+    const WCHAR *path = nativePath;
 
     /*
      * The DeleteFile API acts differently under Win95/98 and NT WRT NULL and
@@ -859,7 +859,7 @@ TclpObjCreateDirectory(
 
 static int
 DoCreateDirectory(
-    const TCHAR *nativePath)	/* Pathname of directory to create (native). */
+    const WCHAR *nativePath)	/* Pathname of directory to create (native). */
 {
     if (CreateDirectory(nativePath, NULL) == 0) {
 	DWORD error = GetLastError();
@@ -1009,7 +1009,7 @@ TclpObjRemoveDirectory(
 
 static int
 DoRemoveJustDirectory(
-    const TCHAR *nativePath,	/* Pathname of directory to be removed
+    const WCHAR *nativePath,	/* Pathname of directory to be removed
 				 * (native). */
     int ignoreError,		/* If non-zero, don't initialize the errorPtr
 				 * under some circumstances on return. */
@@ -1129,7 +1129,7 @@ DoRemoveDirectory(
 				 * filled with UTF-8 name of file causing
 				 * error. */
 {
-    int res = DoRemoveJustDirectory((const TCHAR *)Tcl_DStringValue(pathPtr), recursive,
+    int res = DoRemoveJustDirectory((const WCHAR *)Tcl_DStringValue(pathPtr), recursive,
 	    errorPtr);
 
     if ((res == TCL_ERROR) && (recursive != 0) && (Tcl_GetErrno() == EEXIST)) {
@@ -1180,7 +1180,7 @@ TraverseWinTree(
 				 * error. */
 {
     DWORD sourceAttr;
-    TCHAR *nativeSource, *nativeTarget, *nativeErrfile;
+    WCHAR *nativeSource, *nativeTarget, *nativeErrfile;
     int result, found, sourceLen, targetLen = 0, oldSourceLen, oldTargetLen;
     HANDLE handle;
     WIN32_FIND_DATA data;
@@ -1189,8 +1189,8 @@ TraverseWinTree(
     result = TCL_OK;
     oldTargetLen = 0;		/* lint. */
 
-    nativeSource = (TCHAR *) Tcl_DStringValue(sourcePtr);
-    nativeTarget = (TCHAR *)
+    nativeSource = (WCHAR *) Tcl_DStringValue(sourcePtr);
+    nativeTarget = (WCHAR *)
 	    (targetPtr == NULL ? NULL : Tcl_DStringValue(targetPtr));
 
     oldSourceLen = Tcl_DStringLength(sourcePtr);
@@ -1217,10 +1217,10 @@ TraverseWinTree(
 	return traverseProc(nativeSource, nativeTarget, DOTREE_F, errorPtr);
     }
 
-    Tcl_DStringAppend(sourcePtr, (char *) TEXT("\\*.*"), 4 * sizeof(TCHAR) + 1);
+    Tcl_DStringAppend(sourcePtr, (char *) L"\\*.*", 4 * sizeof(WCHAR) + 1);
     Tcl_DStringSetLength(sourcePtr, Tcl_DStringLength(sourcePtr) - 1);
 
-    nativeSource = (TCHAR *) Tcl_DStringValue(sourcePtr);
+    nativeSource = (WCHAR *) Tcl_DStringValue(sourcePtr);
     handle = FindFirstFile(nativeSource, &data);
     if (handle == INVALID_HANDLE_VALUE) {
 	/*
@@ -1241,24 +1241,24 @@ TraverseWinTree(
 	return result;
     }
 
-    sourceLen = oldSourceLen + sizeof(TCHAR);
-    Tcl_DStringAppend(sourcePtr, (char *) TEXT("\\"), sizeof(TCHAR) + 1);
+    sourceLen = oldSourceLen + sizeof(WCHAR);
+    Tcl_DStringAppend(sourcePtr, (char *) L"\\", sizeof(WCHAR) + 1);
     Tcl_DStringSetLength(sourcePtr, sourceLen);
     if (targetPtr != NULL) {
 	oldTargetLen = Tcl_DStringLength(targetPtr);
 
 	targetLen = oldTargetLen;
-	targetLen += sizeof(TCHAR);
-	Tcl_DStringAppend(targetPtr, (char *) TEXT("\\"), sizeof(TCHAR) + 1);
+	targetLen += sizeof(WCHAR);
+	Tcl_DStringAppend(targetPtr, (char *) L"\\", sizeof(WCHAR) + 1);
 	Tcl_DStringSetLength(targetPtr, targetLen);
     }
 
     found = 1;
     for (; found; found = FindNextFile(handle, &data)) {
-	TCHAR *nativeName;
+	WCHAR *nativeName;
 	int len;
 
-	TCHAR *wp = data.cFileName;
+	WCHAR *wp = data.cFileName;
 	if (*wp == '.') {
 	    wp++;
 	    if (*wp == '.') {
@@ -1268,8 +1268,8 @@ TraverseWinTree(
 		continue;
 	    }
 	}
-	nativeName = (TCHAR *) data.cFileName;
-	len = _tcslen(data.cFileName) * sizeof(TCHAR);
+	nativeName = (WCHAR *) data.cFileName;
+	len = wcslen(data.cFileName) * sizeof(WCHAR);
 
 	/*
 	 * Append name after slash, and recurse on the file.
@@ -1314,8 +1314,8 @@ TraverseWinTree(
 	 * files in that directory.
 	 */
 
-	result = traverseProc((const TCHAR *)Tcl_DStringValue(sourcePtr),
-		(const TCHAR *)(targetPtr == NULL ? NULL : Tcl_DStringValue(targetPtr)),
+	result = traverseProc((const WCHAR *)Tcl_DStringValue(sourcePtr),
+		(const WCHAR *)(targetPtr == NULL ? NULL : Tcl_DStringValue(targetPtr)),
 		DOTREE_POSTD, errorPtr);
     }
 
@@ -1350,8 +1350,8 @@ TraverseWinTree(
 
 static int
 TraversalCopy(
-    const TCHAR *nativeSrc,	/* Source pathname to copy. */
-    const TCHAR *nativeDst,	/* Destination pathname of copy. */
+    const WCHAR *nativeSrc,	/* Source pathname to copy. */
+    const WCHAR *nativeDst,	/* 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. */
@@ -1416,8 +1416,8 @@ TraversalCopy(
 
 static int
 TraversalDelete(
-    const TCHAR *nativeSrc,	/* Source pathname to delete. */
-    const TCHAR *dstPtr,	/* Not used. */
+    const WCHAR *nativeSrc,	/* Source pathname to delete. */
+    const WCHAR *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. */
@@ -1503,7 +1503,7 @@ GetWinFileAttributes(
     Tcl_Obj **attributePtrPtr)	/* A pointer to return the object with. */
 {
     DWORD result;
-    const TCHAR *nativeName;
+    const WCHAR *nativeName;
     int attr;
 
     nativeName = Tcl_FSGetNativePath(fileName);
@@ -1636,7 +1636,7 @@ ConvertFileNameFormat(
 	    Tcl_Obj *tempPath;
 	    Tcl_DString ds;
 	    Tcl_DString dsTemp;
-	    const TCHAR *nativeName;
+	    const WCHAR *nativeName;
 	    const char *tempString;
 	    WIN32_FIND_DATA data;
 	    HANDLE handle;
@@ -1683,7 +1683,7 @@ ConvertFileNameFormat(
 		}
 	    } else {
 		if (data.cAlternateFileName[0] == '\0') {
-		    nativeName = (TCHAR *) data.cFileName;
+		    nativeName = (WCHAR *) data.cFileName;
 		}
 	    }
 
@@ -1829,7 +1829,7 @@ SetWinFileAttributes(
 {
     DWORD fileAttributes, old;
     int yesNo, result;
-    const TCHAR *nativeName;
+    const WCHAR *nativeName;
 
     nativeName = Tcl_FSGetNativePath(fileName);
     fileAttributes = old = GetFileAttributes(nativeName);
diff --git a/win/tclWinFile.c b/win/tclWinFile.c
index 6a48c13..bc5df72 100644
--- a/win/tclWinFile.c
+++ b/win/tclWinFile.c
@@ -156,27 +156,27 @@ static void		FromCTime(time_t posixTime, FILETIME *fileTime);
  * Declarations for local functions defined in this file:
  */
 
-static int		NativeAccess(const TCHAR *path, int mode);
-static int		NativeDev(const TCHAR *path);
-static int		NativeStat(const TCHAR *path, Tcl_StatBuf *statPtr,
+static int		NativeAccess(const WCHAR *path, int mode);
+static int		NativeDev(const WCHAR *path);
+static int		NativeStat(const WCHAR *path, Tcl_StatBuf *statPtr,
 			    int checkLinks);
 static unsigned short	NativeStatMode(DWORD attr, int checkLinks,
 			    int isExec);
-static int		NativeIsExec(const TCHAR *path);
-static int		NativeReadReparse(const TCHAR *LinkDirectory,
+static int		NativeIsExec(const WCHAR *path);
+static int		NativeReadReparse(const WCHAR *LinkDirectory,
 			    REPARSE_DATA_BUFFER *buffer, DWORD desiredAccess);
-static int		NativeWriteReparse(const TCHAR *LinkDirectory,
+static int		NativeWriteReparse(const WCHAR *LinkDirectory,
 			    REPARSE_DATA_BUFFER *buffer);
 static int		NativeMatchType(int isDrive, DWORD attr,
-			    const TCHAR *nativeName, Tcl_GlobTypeData *types);
+			    const WCHAR *nativeName, Tcl_GlobTypeData *types);
 static int		WinIsDrive(const char *name, size_t nameLen);
 static int		WinIsReserved(const char *path);
-static Tcl_Obj *	WinReadLink(const TCHAR *LinkSource);
-static Tcl_Obj *	WinReadLinkDirectory(const TCHAR *LinkDirectory);
-static int		WinLink(const TCHAR *LinkSource,
-			    const TCHAR *LinkTarget, int linkAction);
-static int		WinSymLinkDirectory(const TCHAR *LinkDirectory,
-			    const TCHAR *LinkTarget);
+static Tcl_Obj *	WinReadLink(const WCHAR *LinkSource);
+static Tcl_Obj *	WinReadLinkDirectory(const WCHAR *LinkDirectory);
+static int		WinLink(const WCHAR *LinkSource,
+			    const WCHAR *LinkTarget, int linkAction);
+static int		WinSymLinkDirectory(const WCHAR *LinkDirectory,
+			    const WCHAR *LinkTarget);
 MODULE_SCOPE void	tclWinDebugPanic(const char *format, ...);
 
 /*
@@ -191,12 +191,12 @@ MODULE_SCOPE void	tclWinDebugPanic(const char *format, ...);
 
 static int
 WinLink(
-    const TCHAR *linkSourcePath,
-    const TCHAR *linkTargetPath,
+    const WCHAR *linkSourcePath,
+    const WCHAR *linkTargetPath,
     int linkAction)
 {
-    TCHAR tempFileName[MAX_PATH];
-    TCHAR *tempFilePart;
+    WCHAR tempFileName[MAX_PATH];
+    WCHAR *tempFilePart;
     DWORD attr;
 
     /*
@@ -306,10 +306,10 @@ WinLink(
 
 static Tcl_Obj *
 WinReadLink(
-    const TCHAR *linkSourcePath)
+    const WCHAR *linkSourcePath)
 {
-    TCHAR tempFileName[MAX_PATH];
-    TCHAR *tempFilePart;
+    WCHAR tempFileName[MAX_PATH];
+    WCHAR *tempFilePart;
     DWORD attr;
 
     /*
@@ -370,8 +370,8 @@ WinReadLink(
 
 static int
 WinSymLinkDirectory(
-    const TCHAR *linkDirPath,
-    const TCHAR *linkTargetPath)
+    const WCHAR *linkDirPath,
+    const WCHAR *linkTargetPath)
 {
     DUMMY_REPARSE_BUFFER dummy;
     REPARSE_DATA_BUFFER *reparseBuffer = (REPARSE_DATA_BUFFER *) &dummy;
@@ -442,8 +442,8 @@ WinSymLinkDirectory(
 
 int
 TclWinSymLinkCopyDirectory(
-    const TCHAR *linkOrigPath,	/* Existing junction - reparse point */
-    const TCHAR *linkCopyPath)	/* Will become a duplicate junction */
+    const WCHAR *linkOrigPath,	/* Existing junction - reparse point */
+    const WCHAR *linkCopyPath)	/* Will become a duplicate junction */
 {
     DUMMY_REPARSE_BUFFER dummy;
     REPARSE_DATA_BUFFER *reparseBuffer = (REPARSE_DATA_BUFFER *) &dummy;
@@ -473,7 +473,7 @@ TclWinSymLinkCopyDirectory(
 
 int
 TclWinSymLinkDelete(
-    const TCHAR *linkOrigPath,
+    const WCHAR *linkOrigPath,
     int linkOnly)
 {
     /*
@@ -538,7 +538,7 @@ TclWinSymLinkDelete(
 
 static Tcl_Obj *
 WinReadLinkDirectory(
-    const TCHAR *linkDirPath)
+    const WCHAR *linkDirPath)
 {
     int attr, len, offset;
     DUMMY_REPARSE_BUFFER dummy;
@@ -634,9 +634,9 @@ WinReadLinkDirectory(
 	    }
 	}
 
-	Tcl_WinTCharToUtf((const TCHAR *)
+	Tcl_WinTCharToUtf(
 		reparseBuffer->MountPointReparseBuffer.PathBuffer,
-		(int) reparseBuffer->MountPointReparseBuffer
+		reparseBuffer->MountPointReparseBuffer
 		.SubstituteNameLength, &ds);
 
 	copy = Tcl_DStringValue(&ds)+offset;
@@ -673,7 +673,7 @@ WinReadLinkDirectory(
 
 static int
 NativeReadReparse(
-    const TCHAR *linkDirPath,	/* The junction to read */
+    const WCHAR *linkDirPath,	/* The junction to read */
     REPARSE_DATA_BUFFER *buffer,/* Pointer to buffer. Cannot be NULL */
     DWORD desiredAccess)
 {
@@ -729,7 +729,7 @@ NativeReadReparse(
 
 static int
 NativeWriteReparse(
-    const TCHAR *linkDirPath,
+    const WCHAR *linkDirPath,
     REPARSE_DATA_BUFFER *buffer)
 {
     HANDLE hFile;
@@ -893,7 +893,7 @@ TclpMatchInDirectory(
 				 * May be NULL. In particular the directory
 				 * flag is very important. */
 {
-    const TCHAR *native;
+    const WCHAR *native;
 
     if (types != NULL && types->type == TCL_GLOB_TYPE_MOUNT) {
 	/*
@@ -1293,7 +1293,7 @@ NativeMatchType(
     int isDrive,		/* Is this a drive. */
     DWORD attr,			/* We already know the attributes for the
 				 * file. */
-    const TCHAR *nativeName,	/* Native path to check. */
+    const WCHAR *nativeName,	/* Native path to check. */
     Tcl_GlobTypeData *types)	/* Type description to match against. */
 {
     /*
@@ -1542,7 +1542,7 @@ TclpGetUserHome(
 
 static int
 NativeAccess(
-    const TCHAR *nativePath,	/* Path of file to access, native encoding. */
+    const WCHAR *nativePath,	/* Path of file to access, native encoding. */
     int mode)			/* Permission setting. */
 {
     DWORD attr;
@@ -1804,9 +1804,9 @@ NativeAccess(
 
 static int
 NativeIsExec(
-    const TCHAR *path)
+    const WCHAR *path)
 {
-    int len = _tcslen(path);
+    int len = wcslen(path);
 
     if (len < 5) {
 	return 0;
@@ -1817,11 +1817,11 @@ NativeIsExec(
     }
 
     path += len-3;
-    if ((_tcsicmp(path, TEXT("exe")) == 0)
-	    || (_tcsicmp(path, TEXT("com")) == 0)
-	    || (_tcsicmp(path, TEXT("cmd")) == 0)
-	    || (_tcsicmp(path, TEXT("cmd")) == 0)
-	    || (_tcsicmp(path, TEXT("bat")) == 0)) {
+    if ((wcsicmp(path, L"exe") == 0)
+	    || (wcsicmp(path, L"com") == 0)
+	    || (wcsicmp(path, L"cmd") == 0)
+	    || (wcsicmp(path, L"cmd") == 0)
+	    || (wcsicmp(path, L"bat") == 0)) {
 	return 1;
     }
     return 0;
@@ -1848,7 +1848,7 @@ TclpObjChdir(
     Tcl_Obj *pathPtr)	/* Path to new working directory. */
 {
     int result;
-    const TCHAR *nativePath;
+    const WCHAR *nativePath;
 
     nativePath = Tcl_FSGetNativePath(pathPtr);
 
@@ -1892,7 +1892,7 @@ TclpGetCwd(
     Tcl_DString *bufferPtr)	/* Uninitialized or free DString filled with
 				 * name of current directory. */
 {
-    TCHAR buffer[MAX_PATH];
+    WCHAR buffer[MAX_PATH];
     char *p;
     WCHAR *native;
 
@@ -1915,7 +1915,7 @@ TclpGetCwd(
 	    && (native[2] == '\\') && (native[3] == '\\')) {
 	native += 2;
     }
-    Tcl_WinTCharToUtf((TCHAR *) native, -1, bufferPtr);
+    Tcl_WinTCharToUtf(native, -1, bufferPtr);
 
     /*
      * Convert to forward slashes for easier use in scripts.
@@ -1970,7 +1970,7 @@ TclpObjStat(
 
 static int
 NativeStat(
-    const TCHAR *nativePath,	/* Path of file to stat */
+    const WCHAR *nativePath,	/* Path of file to stat */
     Tcl_StatBuf *statPtr,	/* Filled with results of stat call. */
     int checkLinks)		/* If non-zero, behave like 'lstat' */
 {
@@ -2111,12 +2111,12 @@ NativeStat(
 
 static int
 NativeDev(
-    const TCHAR *nativePath)	/* Full path of file to stat */
+    const WCHAR *nativePath)	/* Full path of file to stat */
 {
     int dev;
     Tcl_DString ds;
-    TCHAR nativeFullPath[MAX_PATH];
-    TCHAR *nativePart;
+    WCHAR nativeFullPath[MAX_PATH];
+    WCHAR *nativePart;
     const char *fullPath;
 
     GetFullPathName(nativePath, MAX_PATH, nativeFullPath, &nativePart);
@@ -2125,7 +2125,7 @@ NativeDev(
     if ((fullPath[0] == '\\') && (fullPath[1] == '\\')) {
 	const char *p;
 	DWORD dw;
-	const TCHAR *nativeVol;
+	const WCHAR *nativeVol;
 	Tcl_DString volString;
 
 	p = strchr(fullPath + 2, '\\');
@@ -2287,7 +2287,7 @@ ClientData
 TclpGetNativeCwd(
     ClientData clientData)
 {
-    TCHAR buffer[MAX_PATH];
+    WCHAR buffer[MAX_PATH];
 
     if (GetCurrentDirectory(MAX_PATH, buffer) == 0) {
 	TclWinConvertError(GetLastError());
@@ -2295,7 +2295,7 @@ TclpGetNativeCwd(
     }
 
     if (clientData != NULL) {
-	if (_tcscmp((const TCHAR*)clientData, buffer) == 0) {
+	if (wcscmp((const WCHAR*)clientData, buffer) == 0) {
 	    return clientData;
 	}
     }
@@ -2336,8 +2336,8 @@ TclpObjLink(
 {
     if (toPtr != NULL) {
 	int res;
-	const TCHAR *LinkTarget;
-	const TCHAR *LinkSource = Tcl_FSGetNativePath(pathPtr);
+	const WCHAR *LinkTarget;
+	const WCHAR *LinkSource = Tcl_FSGetNativePath(pathPtr);
 	Tcl_Obj *normalizedToPtr = Tcl_FSGetNormalizedPath(NULL, toPtr);
 
 	if (normalizedToPtr == NULL) {
@@ -2356,7 +2356,7 @@ TclpObjLink(
 	    return NULL;
 	}
     } else {
-	const TCHAR *LinkSource = Tcl_FSGetNativePath(pathPtr);
+	const WCHAR *LinkSource = Tcl_FSGetNativePath(pathPtr);
 
 	if (LinkSource == NULL) {
 	    return NULL;
@@ -2390,7 +2390,7 @@ TclpFilesystemPathType(
 {
 #define VOL_BUF_SIZE 32
     int found;
-    TCHAR volType[VOL_BUF_SIZE];
+    WCHAR volType[VOL_BUF_SIZE];
     char *firstSeparator;
     const char *path;
     Tcl_Obj *normPath = Tcl_FSGetNormalizedPath(NULL, pathPtr);
@@ -2491,7 +2491,7 @@ TclpObjNormalizePath(
 	     */
 
 	    WIN32_FILE_ATTRIBUTE_DATA data;
-	    const TCHAR *nativePath = Tcl_WinUtfToTChar(path,
+	    const WCHAR *nativePath = Tcl_WinUtfToTChar(path,
 		    currentPathEndPosition - path, &ds);
 
 	    if (GetFileAttributesEx(nativePath,
@@ -2634,8 +2634,8 @@ TclpObjNormalizePath(
 
 		    Tcl_DStringAppend(&dsNorm, ((const char *)nativePath)
 			    + Tcl_DStringLength(&ds)
-			    - (dotLen * sizeof(TCHAR)),
-			    (int)(dotLen * sizeof(TCHAR)));
+			    - (dotLen * sizeof(WCHAR)),
+			    dotLen * sizeof(WCHAR));
 		} else {
 		    /*
 		     * Normal path.
@@ -2693,10 +2693,10 @@ TclpObjNormalizePath(
 
 	if (1) {
 	    WCHAR wpath[MAX_PATH];
-	    const TCHAR *nativePath =
+	    const WCHAR *nativePath =
 		    Tcl_WinUtfToTChar(path, lastValidPathEnd - path, &ds);
 	    DWORD wpathlen = GetLongPathNameProc(nativePath,
-		    (TCHAR *) wpath, MAX_PATH);
+		    (WCHAR *) wpath, MAX_PATH);
 
 	    /*
 	     * We have to make the drive letter uppercase.
@@ -2724,7 +2724,7 @@ TclpObjNormalizePath(
 	 * native encoding, so we have to convert it to Utf.
 	 */
 
-	Tcl_WinTCharToUtf((const TCHAR *) Tcl_DStringValue(&dsNorm),
+	Tcl_WinTCharToUtf((const WCHAR *) Tcl_DStringValue(&dsNorm),
 		Tcl_DStringLength(&dsNorm), &ds);
 	nextCheckpoint = Tcl_DStringLength(&ds);
 	if (*lastValidPathEnd != 0) {
@@ -2900,7 +2900,7 @@ TclpNativeToNormalized(
     size_t len;
     char *copy, *p;
 
-    Tcl_WinTCharToUtf((const TCHAR *) clientData, -1, &ds);
+    Tcl_WinTCharToUtf((const WCHAR *) clientData, -1, &ds);
     copy = Tcl_DStringValue(&ds);
     len = Tcl_DStringLength(&ds);
 
@@ -3092,7 +3092,7 @@ TclNativeDupInternalRep(
 	return NULL;
     }
 
-    len = sizeof(TCHAR) * (_tcslen((const TCHAR *) clientData) + 1);
+    len = sizeof(WCHAR) * (wcslen((const WCHAR *) clientData) + 1);
 
     copy = Tcl_Alloc(len);
     memcpy(copy, clientData, len);
@@ -3123,7 +3123,7 @@ TclpUtime(
 {
     int res = 0;
     HANDLE fileHandle;
-    const TCHAR *native;
+    const WCHAR *native;
     DWORD attr = 0;
     DWORD flags = FILE_ATTRIBUTE_NORMAL;
     FILETIME lastAccessTime, lastModTime;
@@ -3174,7 +3174,7 @@ int
 TclWinFileOwned(
     Tcl_Obj *pathPtr)		/* File whose ownership is to be checked */
 {
-    const TCHAR *native;
+    const WCHAR *native;
     PSID ownerSid = NULL;
     PSECURITY_DESCRIPTOR secd = NULL;
     HANDLE token;
diff --git a/win/tclWinInit.c b/win/tclWinInit.c
index a9d6abc..b2c8aaa 100644
--- a/win/tclWinInit.c
+++ b/win/tclWinInit.c
@@ -155,7 +155,7 @@ TclpInitPlatform(void)
     /*
      * Fill available functions depending on windows version
      */
-    handle = GetModuleHandle(TEXT("KERNEL32"));
+    handle = GetModuleHandle(L"KERNEL32");
     tclWinProcs.cancelSynchronousIo =
 	    (BOOL (WINAPI *)(HANDLE)) GetProcAddress(handle,
 	    "CancelSynchronousIo");
@@ -469,14 +469,14 @@ TclpGetUserName(
     Tcl_DStringInit(bufferPtr);
 
     if (TclGetEnv("USERNAME", bufferPtr) == NULL) {
-	TCHAR szUserName[UNLEN+1];
+	WCHAR szUserName[UNLEN+1];
 	DWORD cchUserNameLen = UNLEN;
 
 	if (!GetUserName(szUserName, &cchUserNameLen)) {
 	    return NULL;
 	}
 	cchUserNameLen--;
-	cchUserNameLen *= sizeof(TCHAR);
+	cchUserNameLen *= sizeof(WCHAR);
 	Tcl_WinTCharToUtf(szUserName, cchUserNameLen, bufferPtr);
     }
     return Tcl_DStringValue(bufferPtr);
@@ -517,7 +517,7 @@ TclpSetVariables(
 	    TclGetProcessGlobalValue(&defaultLibraryDir), TCL_GLOBAL_ONLY);
 
     if (!osInfoInitialized) {
-	HMODULE handle = GetModuleHandle(TEXT("NTDLL"));
+	HMODULE handle = GetModuleHandle(L"NTDLL");
 	int(__stdcall *getversion)(void *) =
 		(int(__stdcall *)(void *)) GetProcAddress(handle, "RtlGetVersion");
 	osInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
diff --git a/win/tclWinInt.h b/win/tclWinInt.h
index 0e7a44f..a12ed16 100644
--- a/win/tclWinInt.h
+++ b/win/tclWinInt.h
@@ -46,7 +46,7 @@ MODULE_SCOPE TclWinProcs tclWinProcs;
  */
 
 MODULE_SCOPE char	TclWinDriveLetterForVolMountPoint(
-			    const TCHAR *mountPoint);
+			    const WCHAR *mountPoint);
 MODULE_SCOPE void	TclWinEncodingsCleanup();
 MODULE_SCOPE void	TclWinInit(HINSTANCE hInst);
 MODULE_SCOPE TclFile	TclWinMakeFile(HANDLE handle);
@@ -56,7 +56,7 @@ 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,
+MODULE_SCOPE HANDLE	TclWinSerialOpen(HANDLE handle, const WCHAR *name,
 			    DWORD access);
 MODULE_SCOPE int	TclWinSymLinkCopyDirectory(const TCHAR *LinkOriginal,
 			    const TCHAR *LinkCopy);
diff --git a/win/tclWinPipe.c b/win/tclWinPipe.c
index 6f86b95..ffa3fbf 100644
--- a/win/tclWinPipe.c
+++ b/win/tclWinPipe.c
@@ -191,7 +191,7 @@ static DWORD WINAPI	PipeReaderThread(LPVOID arg);
 static void		PipeSetupProc(ClientData clientData, int flags);
 static void		PipeWatchProc(ClientData instanceData, int mask);
 static DWORD WINAPI	PipeWriterThread(LPVOID arg);
-static int		TempFileName(TCHAR name[MAX_PATH]);
+static int		TempFileName(WCHAR name[MAX_PATH]);
 static int		WaitForRead(PipeInfo *infoPtr, int blocking);
 static void		PipeThreadActionProc(ClientData instanceData,
 			    int action);
@@ -463,10 +463,10 @@ TclWinMakeFile(
 
 static int
 TempFileName(
-    TCHAR name[MAX_PATH])	/* Buffer in which name for temporary file
+    WCHAR name[MAX_PATH])	/* Buffer in which name for temporary file
 				 * gets stored. */
 {
-    const TCHAR *prefix = TEXT("TCL");
+    const WCHAR *prefix = L"TCL";
     if (GetTempPath(MAX_PATH, name) != 0) {
 	if (GetTempFileName(name, prefix, 0, name) != 0) {
 	    return 1;
@@ -533,7 +533,7 @@ TclpOpenFile(
     HANDLE handle;
     DWORD accessMode, createMode, shareMode, flags;
     Tcl_DString ds;
-    const TCHAR *nativePath;
+    const WCHAR *nativePath;
 
     /*
      * Map the access bits to the NT access mode.
@@ -650,7 +650,7 @@ TclFile
 TclpCreateTempFile(
     const char *contents)	/* String to write into temp file, or NULL. */
 {
-    TCHAR name[MAX_PATH];
+    WCHAR name[MAX_PATH];
     const char *native;
     Tcl_DString dstring;
     HANDLE handle;
@@ -744,7 +744,7 @@ TclpCreateTempFile(
 Tcl_Obj *
 TclpTempFileName(void)
 {
-    TCHAR fileName[MAX_PATH];
+    WCHAR fileName[MAX_PATH];
 
     if (TempFileName(fileName) == 0) {
 	return NULL;
@@ -936,7 +936,7 @@ TclpCreateProcess(
 				 * process. */
 {
     int result, applType, createFlags;
-    Tcl_DString cmdLine;	/* Complete command line (TCHAR). */
+    Tcl_DString cmdLine;	/* Complete command line (WCHAR). */
     STARTUPINFO startInfo;
     PROCESS_INFORMATION procInfo;
     SECURITY_ATTRIBUTES secAtts;
@@ -1048,7 +1048,7 @@ TclpCreateProcess(
 	 * sink.
 	 */
 
-	startInfo.hStdOutput = CreateFile(TEXT("NUL:"), GENERIC_WRITE, 0,
+	startInfo.hStdOutput = CreateFile(L"NUL:", GENERIC_WRITE, 0,
 		&secAtts, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
     } else {
 	DuplicateHandle(hProcess, outputHandle, hProcess,
@@ -1068,7 +1068,7 @@ TclpCreateProcess(
 	 * sink.
 	 */
 
-	startInfo.hStdError = CreateFile(TEXT("NUL:"), GENERIC_WRITE, 0,
+	startInfo.hStdError = CreateFile(L"NUL:", GENERIC_WRITE, 0,
 		&secAtts, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
     } else {
 	DuplicateHandle(hProcess, errorHandle, hProcess, &startInfo.hStdError,
@@ -1134,7 +1134,7 @@ TclpCreateProcess(
 
     BuildCommandLine(execPath, argc, argv, &cmdLine);
 
-    if (CreateProcess(NULL, (TCHAR *) Tcl_DStringValue(&cmdLine),
+    if (CreateProcess(NULL, (WCHAR *) Tcl_DStringValue(&cmdLine),
 	    NULL, NULL, TRUE, (DWORD) createFlags, NULL, NULL, &startInfo,
 	    &procInfo) == 0) {
 	TclWinConvertError(GetLastError());
@@ -1260,14 +1260,14 @@ ApplicationType(
 {
     int applType, i, nameLen, found;
     HANDLE hFile;
-    TCHAR *rest;
+    WCHAR *rest;
     char *ext;
     char buf[2];
     DWORD attr, read;
     IMAGE_DOS_HEADER header;
     Tcl_DString nameBuf, ds;
-    const TCHAR *nativeName;
-    TCHAR nativeFullPath[MAX_PATH];
+    const WCHAR *nativeName;
+    WCHAR nativeFullPath[MAX_PATH];
     static const char extensions[][5] = {"", ".com", ".exe", ".bat", ".cmd"};
 
     /*
@@ -1512,7 +1512,7 @@ BuildCommandLine(
     int argc,			/* Number of arguments. */
     const char **argv,		/* Argument strings in UTF. */
     Tcl_DString *linePtr)	/* Initialized Tcl_DString that receives the
-				 * command line (TCHAR). */
+				 * command line (WCHAR). */
 {
     const char *arg, *start, *special, *bspos;
     int quote = 0, i;
@@ -3101,7 +3101,7 @@ TclpOpenTemporaryFile(
     Tcl_Obj *extensionObj,
     Tcl_Obj *resultingNameObj)
 {
-    TCHAR name[MAX_PATH];
+    WCHAR name[MAX_PATH];
     char *namePtr;
     HANDLE handle;
     DWORD flags = FILE_ATTRIBUTE_TEMPORARY;
@@ -3118,7 +3118,7 @@ TclpOpenTemporaryFile(
     if (length == 0) {
 	goto gotError;
     }
-    namePtr += length * sizeof(TCHAR);
+    namePtr += length * sizeof(WCHAR);
     if (basenameObj) {
 	const char *string = TclGetStringFromObj(basenameObj, &length);
 
@@ -3127,8 +3127,8 @@ TclpOpenTemporaryFile(
 	namePtr += Tcl_DStringLength(&buf);
 	Tcl_DStringFree(&buf);
     } else {
-	const TCHAR *baseStr = TEXT("TCL");
-	length = 3 * sizeof(TCHAR);
+	const WCHAR *baseStr = L"TCL";
+	length = 3 * sizeof(WCHAR);
 
 	memcpy(namePtr, baseStr, length);
 	namePtr += length;
diff --git a/win/tclWinPort.h b/win/tclWinPort.h
index 42f58de..3094f0d 100644
--- a/win/tclWinPort.h
+++ b/win/tclWinPort.h
@@ -52,15 +52,6 @@ typedef DWORD_PTR * PDWORD_PTR;
 #   include <wspiapi.h>
 #endif
 
-#ifdef CHECK_UNICODE_CALLS
-#   define _UNICODE
-#   define UNICODE
-#   define __TCHAR_DEFINED
-    typedef float *_TCHAR;
-#   define _TCHAR_DEFINED
-    typedef float *TCHAR;
-#endif /* CHECK_UNICODE_CALLS */
-
 /*
  *  Pull in the typedef of TCHAR for windows.
  */
diff --git a/win/tclWinSerial.c b/win/tclWinSerial.c
index ac569e4..f2169be 100644
--- a/win/tclWinSerial.c
+++ b/win/tclWinSerial.c
@@ -1368,7 +1368,7 @@ SerialWriterThread(
 HANDLE
 TclWinSerialOpen(
     HANDLE handle,
-    const TCHAR *name,
+    const WCHAR *name,
     DWORD access)
 {
     SerialInit();
@@ -1595,7 +1595,7 @@ SerialSetOptionProc(
     BOOL result, flag;
     size_t len, vlen;
     Tcl_DString ds;
-    const TCHAR *native;
+    const WCHAR *native;
     int argc;
     const char **argv;
 
@@ -1718,7 +1718,7 @@ SerialSetOptionProc(
 	    if (interp != NULL) {
 		Tcl_SetObjResult(interp, Tcl_NewStringObj(
 			"bad value for -xchar: should be a list of"
-			" two elements with each a single character", -1));
+			" two elements with each a single 8-bit character", -1));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "XCHAR", NULL);
 	    }
 	    Tcl_Free(argv);
@@ -1742,12 +1742,12 @@ SerialSetOptionProc(
 	    int charLen;
 
 	    charLen = Tcl_UtfToUniChar(argv[0], &character);
-	    if (argv[0][charLen]) {
+	    if ((character > 0xFF) || argv[0][charLen]) {
 		goto badXchar;
 	    }
 	    dcb.XonChar = (char) character;
 	    charLen = Tcl_UtfToUniChar(argv[1], &character);
-	    if (argv[1][charLen]) {
+	    if ((character > 0xFF) || argv[1][charLen]) {
 		goto badXchar;
 	    }
 	    dcb.XoffChar = (char) character;
@@ -2077,7 +2077,7 @@ SerialGetOptionProc(
 	Tcl_DStringStartSublist(dsPtr);
     }
     if (len==0 || (len>1 && strncmp(optionName, "-xchar", len) == 0)) {
-	char buf[4];
+	char buf[TCL_UTF_MAX];
 	valid = 1;
 
 	if (!GetCommState(infoPtr->handle, &dcb)) {
@@ -2088,9 +2088,9 @@ SerialGetOptionProc(
 	    }
 	    return TCL_ERROR;
 	}
-	sprintf(buf, "%c", dcb.XonChar);
+	buf[Tcl_UniCharToUtf(UCHAR(dcb.XonChar), buf)] = '\0';
 	Tcl_DStringAppendElement(dsPtr, buf);
-	sprintf(buf, "%c", dcb.XoffChar);
+	buf[Tcl_UniCharToUtf(UCHAR(dcb.XoffChar), buf)] = '\0';
 	Tcl_DStringAppendElement(dsPtr, buf);
     }
     if (len == 0) {
diff --git a/win/tclWinSock.c b/win/tclWinSock.c
index ecf5e86..5cb19e9 100644
--- a/win/tclWinSock.c
+++ b/win/tclWinSock.c
@@ -82,7 +82,7 @@
  */
 
 static int initialized = 0;
-static const TCHAR className[] = TEXT("TclSocket");
+static const WCHAR className[] = L"TclSocket";
 TCL_DECLARE_MUTEX(socketMutex)
 
 /*
@@ -363,7 +363,7 @@ InitializeHostName(
     size_t *lengthPtr,
     Tcl_Encoding *encodingPtr)
 {
-    TCHAR tbuf[MAX_COMPUTERNAME_LENGTH + 1];
+    WCHAR tbuf[MAX_COMPUTERNAME_LENGTH + 1];
     DWORD length = MAX_COMPUTERNAME_LENGTH + 1;
     Tcl_DString ds;