4.3BSD/usr/contrib/emacs/lisp/inc-vers.el

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;; Load this file to increment the recorded Emacs version number.
;; Copyright (C) 1985 Richard M. Stallman.

;; This file is part of GNU Emacs.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY.  No author or distributor
;; accepts responsibility to anyone for the consequences of using it
;; or for whether it serves any particular purpose or works at all,
;; unless he says so in writing.  Refer to the GNU Emacs General Public
;; License for full details.

;; Everyone is granted permission to copy, modify and redistribute
;; GNU Emacs, but only under the conditions described in the
;; GNU Emacs General Public License.   A copy of this license is
;; supposed to have been given to you along with GNU Emacs so you
;; can know your rights and responsibilities.  It should be in a
;; file named COPYING.  Among other things, the copyright notice
;; and this notice must be preserved on all copies.


(insert-file-contents "../lisp/version.el")

(re-search-forward "emacs-version \"[0-9.]*")
(save-excursion
  (save-restriction
    (narrow-to-region (point)
		      (progn (skip-chars-backward "0-9") (point)))
    (goto-char (point-min))
    (let ((version (read (current-buffer))))
      (delete-region (point-min) (point-max))
      (prin1 (1+ version) (current-buffer)))))
(skip-chars-backward "^\"")
(message "New Emacs version will be %s"
	 (buffer-substring (point)
			   (progn (skip-chars-forward "^\"") (point))))


(write-region (point-min) (point-max) "../lisp/version.el" nil 'nomsg)
(erase-buffer)
(set-buffer-modified-p nil)

(kill-emacs)