X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=lisp%2Fmm-util.el;h=f7330e5b7dd440324b7de30142ba739f4332ff19;hb=4cacb5f23eb830e6950dba987063f413977708d7;hp=aa9c838d81665c495417b40e4867f65feac06d25;hpb=4dc0c478fdf39b896a5185812101be972b98d5c7;p=elisp%2Fgnus.git-

diff --git a/lisp/mm-util.el b/lisp/mm-util.el
index aa9c838..f7330e5 100644
--- a/lisp/mm-util.el
+++ b/lisp/mm-util.el
@@ -552,14 +552,21 @@ If the charset is `composition', return the actual one."
     ;; This is for XEmacs.
     (mm-mule-charset-to-mime-charset charset)))
 
-(defun mm-delete-duplicates (list)
-  "Simple substitute for CL `delete-duplicates', testing with `equal'."
-  (let (result head)
-    (while list
-      (setq head (car list))
-      (setq list (delete head list))
-      (setq result (cons head result)))
-    (nreverse result)))
+(if (fboundp 'delete-dups)
+    (defalias 'mm-delete-duplicates 'delete-dups)
+  (defun mm-delete-duplicates (list)
+    "Destructively remove `equal' duplicates from LIST.
+Store the result in LIST and return it.  LIST must be a proper list.
+Of several `equal' occurrences of an element in LIST, the first
+one is kept.
+
+This is a compatibility function for Emacsen without `delete-dups'."
+    ;; Code from `subr.el' in Emacs 22:
+    (let ((tail list))
+      (while tail
+	(setcdr tail (delete (car tail) (cdr tail)))
+	(setq tail (cdr tail))))
+    list))
 
 ;; Fixme:  This is used in places when it should be testing the
 ;; default multibyteness.  See mm-default-multibyte-p.