From: Kenichi Handa <handa@m17n.org>
Date: Wed, 18 Jun 1997 13:21:23 +0000 (+0000)
Subject: (coding-system-parent): Moved from mule-util.el.
X-Git-Tag: emacs-20.1~1634
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=bd882697eaf8c576757b07373761169fabb581e3;p=emacs.git

(coding-system-parent): Moved from mule-util.el.
---

diff --git a/lisp/international/mule.el b/lisp/international/mule.el
index 830f3924e2f..5b97b0e6e33 100644
--- a/lisp/international/mule.el
+++ b/lisp/international/mule.el
@@ -291,6 +291,13 @@ See also the documentation of make-char."
        (or (get coding-system 'coding-category)
 	   (coding-system-category (get coding-system 'coding-system)))))
 
+(defun coding-system-parent (coding-system)
+  "Return parent of CODING-SYSTEM."
+  (let ((parent (get coding-system 'parent-coding-system)))
+    (and parent
+	 (or (coding-system-parent parent)
+	     parent))))
+
 ;; Make subsidiary coding systems (eol-type variants) of CODING-SYSTEM.
 (defun make-subsidiary-coding-system (coding-system)
   (let ((subsidiaries (vector (intern (format "%s-unix" coding-system))