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+;; Functions for dealing with char tables.
+;; Copyright (C) 1987 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.
+
+
+;; Written by Howard Gayle.  See case-table.el for details.
+
+(require 'case-table)
+
+(defun rope-to-vector (rope)
+  (let* ((len (/ (length rope) 2))
+	 (vector (make-vector len nil))
+	 (i 0))
+    (while (< i len)
+      (aset vector i (rope-elt rope i))
+      (setq i (1+ i)))))
+
+(defun describe-display-table (DT)
+  "Describe the display-table DT in a help buffer."
+  (with-output-to-temp-buffer "*Help*"
+    (princ "\nTruncation glyf: ")
+    (prin1 (aref dt 256))
+    (princ "\nWrap glyf: ")
+    (prin1 (aref dt 257))
+    (princ "\nEscape glyf: ")
+    (prin1 (aref dt 258))
+    (princ "\nCtrl glyf: ")
+    (prin1 (aref dt 259))
+    (princ "\nSelective display rope: ")
+    (prin1 (rope-to-vector (aref dt 260)))
+    (princ "\nCharacter display ropes:\n")
+    (let ((vector (make-vector 256 nil))
+	  (i 0))
+      (while (< i 256)
+	(aset vector i
+	      (if (stringp (aref dt i))
+		  (rope-to-vector (aref dt i))
+		(aref dt i)))
+	(setq i (1+ i)))
+      (describe-vector vector))
+    (print-help-return-message)))
+
+(defun describe-current-display-table ()
+   "Describe the display-table in use in the selected window and buffer."
+   (interactive)
+   (describe-display-table
+    (or (window-display-table (selected-window))
+	buffer-display-table
+	standard-display-table)))
+
+(defun make-display-table ()
+  (make-vector 261 nil))
+
+(defun standard-display-8bit (l h)
+  "Display characters in the range [L, H] literally."
+  (while (<= l h)
+    (if (and (>= l ?\ ) (< l 127))
+	(if standard-display-table (aset standard-display-table l nil))
+      (or standard-display-table
+	  (setq standard-display-table (make-vector 261 nil)))
+      (aset standard-display-table l l))
+    (setq l (1+ l))))
+
+(defun standard-display-ascii (c s)
+  "Display character C using string S."
+  (or standard-display-table
+      (setq standard-display-table (make-vector 261 nil)))
+  (aset standard-display-table c (apply 'make-rope (append s nil))))
+
+(defun standard-display-g1 (c sc)
+  "Display character C as character SC in the g1 character set."
+  (or standard-display-table
+      (setq standard-display-table (make-vector 261 nil)))
+  (aset standard-display-table c
+	(make-rope (create-glyf (concat "\016" (char-to-string sc) "\017")))))
+
+(defun standard-display-graphic (c gc)
+  "Display character C as character GC in graphics character set."
+  (or standard-display-table
+      (setq standard-display-table (make-vector 261 nil)))
+  (aset standard-display-table c
+	(make-rope (create-glyf (concat "\e(0" (char-to-string gc) "\e(B")))))
+
+(defun standard-display-underline (c uc)
+  "Display character C as character UC plus underlining."
+  (or standard-display-table
+      (setq standard-display-table (make-vector 261 nil)))
+  (aset standard-display-table c
+	(make-rope (create-glyf (concat "\e[4m" (char-to-string uc) "\e[m")))))
+
+(defun create-glyf (string)
+  (let ((i 256))
+    (while (and (< i 65536) (aref glyf-table i)
+		(not (string= (aref glyf-table i) string)))
+      (setq i (1+ i)))
+    (if (= i 65536)
+	(error "No free glyf codes remain"))
+    (aset glyf-table i string)))
+
+(provide 'disp-table)