Typo.

[gnu-emacs] / lisp / rot13.el

diff --git a/lisp/rot13.el b/lisp/rot13.el
index a3307ea352eb6b687ee7d6d3c5d251ae6fcb459b..449583ab8dd47ffcef3d875ce612a3d93cfe4d19 100644 (file)
--- a/lisp/rot13.el
+++ b/lisp/rot13.el
@@ -1,8 +1,9 @@
-;;; rot13.el --- display a buffer in rot13.
+;;; rot13.el --- display a buffer in rot13
 
-;; Copyright (C) 1988 Free Software Foundation, Inc.
+;; Copyright (C) 1988, 2002, 2003, 2004, 2005,
+;;   2006 Free Software Foundation, Inc.
 
-;; Author: Howard Gayle:
+;; Author: Howard Gayle
 ;; Maintainer: FSF
 
 ;; This file is part of GNU Emacs.
@@ -19,19 +20,23 @@
 
 ;; 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, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Commentary:
 
-;; The single entry point, `rot13-other-window', performs a Caesar cipher
-;; encrypt/decrypt on the current buffer and displays the result in another 
+;; The entry point, `rot13-other-window', performs a Caesar cipher
+;; encrypt/decrypt on the current buffer and displays the result in another
 ;; window.  Rot13 encryption is sometimes used on USENET as a read-at-your-
 ;; own-risk wrapper for material some might consider offensive, such as
 ;; ethnic humor.
 ;;
 ;; Written by Howard Gayle.
 ;; This hack is mainly to show off the char table stuff.
+;;
+;; New entry points, `rot13', `rot13-string', and `rot13-region' that
+;; performs Ceasar cipher encrypt/decrypt on buffers and strings, was
+;; added by Simon Josefsson.
 
 ;;; Code:
 
@@ -45,6 +50,42 @@
     table)
   "Char table for rot 13 display.")
 
+(defvar rot13-translate-table
+  (let ((str (make-string 127 0))
+       (i 0))
+    (while (< i 127)
+      (aset str i i)
+      (setq i (1+ i)))
+    (setq i 0)
+    (while (< i 26)
+      (aset str (+ i ?a) (+ (% (+ i 13) 26) ?a))
+      (aset str (+ i ?A) (+ (% (+ i 13) 26) ?A))
+      (setq i (1+ i)))
+    str)
+  "String table for rot 13 translation.")
+
+;;;###autoload
+(defun rot13 (object &optional start end)
+  "Return Rot13 encryption of OBJECT, a buffer or string."
+  (if (bufferp object)
+      (with-current-buffer object
+       (rot13-region start end))
+    (rot13-string object)))
+
+;;;###autoload
+(defun rot13-string (string)
+  "Return Rot13 encryption of STRING."
+  (with-temp-buffer
+    (insert string)
+    (rot13-region (point-min) (point-max))
+    (buffer-string)))
+
+;;;###autoload
+(defun rot13-region (start end)
+  "Rot13 encrypt the region between START and END in current buffer."
+  (interactive "r")
+  (translate-region start end rot13-translate-table))
+
 ;;;###autoload
 (defun rot13-other-window ()
   "Display current buffer in rot 13 in another window.
@@ -70,4 +111,5 @@ See also `toggle-rot13-mode'."
 
 (provide 'rot13)
 
+;;; arch-tag: ad5b9ca8-946c-4414-996f-e9b1bf9ec79f
 ;;; rot13.el ends here