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

2 files changed, 20 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index eb028c98a25..4738fb4812f 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,11 @@
+2004-10-12  Kenichi Handa  <handa@m17n.org>
+
+        * international/mule.el (coding-system-equal): Moved from
+        mule-util.el.
+
+        * international/mule-util.el (coding-system-equal): Moved to
+        mule.el.
+
 2004-10-12  Kim F. Storm  <storm@cua.dk>
 
         * kmacro.el (kmacro-insert-counter, kmacro-add-counter): Use and
diff --git a/lisp/international/mule.el b/lisp/international/mule.el
index 8b4ba9b2ce3..840dd67087f 100644
--- a/lisp/international/mule.el
+++ b/lisp/international/mule.el
@@ -535,6 +535,18 @@ coding system whose eol-type is N."
                  (and (not (> (downcase c1) (downcase c2)))
                       (< c1 c2)))))))
 
+(defun coding-system-equal (coding-system-1 coding-system-2)
+  "Return t if and only if CODING-SYSTEM-1 and CODING-SYSTEM-2 are identical.
+Two coding systems are identical if two symbols are equal
+or one is an alias of the other."
+  (or (eq coding-system-1 coding-system-2)
+      (and (equal (coding-system-spec coding-system-1)
+                  (coding-system-spec coding-system-2))
+           (let ((eol-type-1 (coding-system-eol-type coding-system-1))
+                 (eol-type-2 (coding-system-eol-type coding-system-2)))
+             (or (eq eol-type-1 eol-type-2)
+                 (and (vectorp eol-type-1) (vectorp eol-type-2)))))))
+
 (defun add-to-coding-system-list (coding-system)
   "Add CODING-SYSTEM to `coding-system-list' while keeping it sorted."
   (if (or (null coding-system-list)