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+;;; vc-filewise.el --- common functions for file-oriented back ends.
+
+;; Copyright (C) 1992-1996, 1998-2014 Free Software Foundation, Inc.
+
+;; Author:     FSF (see vc.el for full credits)
+;; Maintainer: Andre Spiegel <spiegel@gnu.org>
+;; Package: vc
+
+;; 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Common functions for file-oriented back ends - SCCS, RCS, SRC, CVS
+;;
+;; The main purpose of this file is so none of this code has to live
+;; in the always-resident vc-hooks.  A secondary purpose is to remove
+;; code specific to this class of back ends from vc.el.
+
+;;; Code:
+
+(eval-when-compile (require 'vc))
+
+(defun vc-master-name (file)
+  "Return the master name of FILE.
+If the file is not registered, or the master name is not known, return nil."
+  (or (vc-file-getprop file 'vc-name)
+      ;; force computation of the property by calling
+      ;; vc-BACKEND-registered explicitly
+      (let ((backend (vc-backend file)))
+	(if (and backend
+		 (vc-filewise-registered backend file))
+	    (vc-file-getprop file 'vc-name)))))
+
+(defun vc-rename-master (oldmaster newfile templates)
+  "Rename OLDMASTER to be the master file for NEWFILE based on TEMPLATES."
+  (let* ((dir (file-name-directory (expand-file-name oldmaster)))
+	 (newdir (or (file-name-directory newfile) ""))
+	 (newbase (file-name-nondirectory newfile))
+	 (masters
+	  ;; List of potential master files for `newfile'
+	  (mapcar
+	   (lambda (s) (vc-possible-master s newdir newbase))
+	   templates)))
+    (when (or (file-symlink-p oldmaster)
+	      (file-symlink-p (file-name-directory oldmaster)))
+      (error "This is unsafe in the presence of symbolic links"))
+    (rename-file
+     oldmaster
+     (catch 'found
+       ;; If possible, keep the master file in the same directory.
+       (dolist (f masters)
+	 (when (and f (string= (file-name-directory (expand-file-name f)) dir))
+	   (throw 'found f)))
+       ;; If not, just use the first possible place.
+       (dolist (f masters)
+	 (and f (or (not (setq dir (file-name-directory f)))
+		    (file-directory-p dir))
+	      (throw 'found f)))
+       (error "New file lacks a version control directory")))))
+
+(defun vc-filewise-registered (backend file)
+  "Check if FILE is registered in BACKEND using vc-BACKEND-master-templates."
+  (let ((sym (vc-make-backend-sym backend 'master-templates)))
+    (unless (get backend 'vc-templates-grabbed)
+      (put backend 'vc-templates-grabbed t))
+    (let ((result (vc-check-master-templates file (symbol-value sym))))
+      (if (stringp result)
+	  (vc-file-setprop file 'vc-name result)
+	nil))))				; Not registered
+
+(provide 'vc-filewise)