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diff --git a/lisp/tabify.el b/lisp/tabify.el
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+;; Tab conversion commands for Emacs
+;; Copyright (C) 1985 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+(defun untabify (start end)
+  "Convert all tabs in region to multiple spaces, preserving columns.
+The variable tab-width controls the action."
+  (interactive "r")
+  (save-excursion
+    (save-restriction
+      (narrow-to-region start end)
+      (goto-char start)
+      (while (search-forward "\t" nil t)	; faster than re-search
+	(let ((start (point))
+	      (column (current-column))
+	      (indent-tabs-mode nil))
+	  (skip-chars-backward "\t")
+	  (delete-region start (point))
+	  (indent-to column))))))
+
+(defun tabify (start end)
+  "Convert multiple spaces in region to tabs when possible.
+A group of spaces is partially replaced by tabs
+when this can be done without changing the column they end at.
+The variable tab-width controls the action."
+  (interactive "r")
+  (save-excursion
+    (save-restriction
+      (narrow-to-region start end)
+      (goto-char start)
+      (while (re-search-forward "[ \t][ \t][ \t]*" nil t)
+	(let ((column (current-column))
+	      (indent-tabs-mode t))
+	  (delete-region (match-beginning 0) (point))
+	  (indent-to column))))))