From b8893d79a7c7c1870ac9263eef28461223346fe3 Mon Sep 17 00:00:00 2001
From: tomo <tomo>
Date: Mon, 28 Jun 1999 13:40:59 +0000
Subject: [PATCH] (coding-system-get): New function. (coding-system-put): New
 function. (coding-system-category): New function.

---
 lisp/mule/mule-misc.el |   56 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/lisp/mule/mule-misc.el b/lisp/mule/mule-misc.el
index 8de1883..a8524e0 100644
--- a/lisp/mule/mule-misc.el
+++ b/lisp/mule/mule-misc.el
@@ -313,4 +313,60 @@ when the language environment is made current."
 ;;   (put env-sym 'quail-environ-doc-string doc-string)
 ;;   (put env-sym 'set-quail-environ enable-function))
 
+
+;;; @ coding-system category
+;;;
+
+(defun coding-system-get (coding-system prop)
+  "Extract a value from CODING-SYSTEM's property list for property PROP."
+  (or (plist-get
+       (get (coding-system-name coding-system) 'coding-system-property)
+       prop)
+      (condition-case nil
+	  (coding-system-property 'iso-2022-jp 'mnemonics)
+	(error nil))))
+
+(defun coding-system-put (coding-system prop val)
+  "Change value in CODING-SYSTEM's property list PROP to VAL."
+  (put (coding-system-name coding-system)
+       'coding-system-property
+       (plist-put (get (coding-system-name coding-system)
+		       'coding-system-property)
+		  prop val)))
+
+(defun coding-system-category (coding-system)
+  "Return the coding category of CODING-SYSTEM."
+  (or (coding-system-get coding-system 'category)
+      (let ((type (coding-system-type coding-system)))
+	(cond ((eq type 'no-conversion)
+	       'no-conversion)
+	      ((eq type 'shift-jis)
+	       'shift-jis)
+	      ((eq type 'ucs-4)
+	       'ucs-4)
+	      ((eq type 'utf-8)
+	       'utf-8)
+	      ((eq type 'big5)
+	       'big5)
+	      ((eq type 'iso2022)
+	       (cond ((coding-system-lock-shift coding-system)
+		      'iso-lock-shift)
+		     ((coding-system-seven coding-system)
+		      'iso-7)
+		     (t
+		      (let ((dim 0)
+			    ccs
+			    (i 0))
+			(while (< i 4)
+			  (setq ccs (coding-system-charset coding-system i))
+			  (if (and ccs
+				   (> (charset-dimension ccs) dim))
+			      (setq dim (charset-dimension ccs))
+			    )
+			  (setq i (1+ i)))
+			(cond ((= dim 1) 'iso-8-1)
+			      ((= dim 2) 'iso-8-2)
+			      (t 'iso-8-designate))
+			))))))))
+	    
 ;;; mule-misc.el ends here
-- 
1.7.10.4