charset ANSI_x3.4-1968, et al

[Karl Chen <quarl@cs.berkeley.edu>]

Dear Gnus developers, I've been starting to receive a lot of
emails from cron [1] with this header:

 Content-Type: text/plain; charset=ANSI_X3.4-1968

I get the message: Unknown charset: ANSI_X3.4-1968

According to RFC 1345, "ANSI_X3.4-1968", along with other names,
are aliases for US-ASCII, and actually, "ANSI_X3.4-1968" is the
official name (though according to
http://www.iana.org/assignments/character-sets, "US-ASCII" is the
preferred MIME name).

Could you consider something such as the patch below, which works
for me:


--- mm-util.el	17 Mar 2007 18:08:14 -0700	7.62
+++ mm-util.el	17 Mar 2007 18:27:45 -0700	
@@ -641,8 +641,9 @@
    ((and allow-override
 	 (let ((cs (cdr (assq charset mm-charset-override-alist))))
 	   (and cs (mm-coding-system-p cs) cs))))
-   ;; ascii
-   ((eq charset 'us-ascii)
+   ;; ascii (see RFC 1345)
+   (memq charset '(us-ascii ansi_x3.4-1968 ansi_x3.4-1986 iso-ir-6 iso646-us
+                            iso_646.irv:1991 us ibm367 cp367 csascii))
     'ascii)
    ;; Check to see whether we can handle this charset.  (This depends
    ;; on there being some coding system matching each `mime-charset'


Regards, Karl

[1] This is now happening on multiple systems (which are all
    Debian).  cron appears to be using the default locale name.
    On Linux, you can get the string ANSI_x3.4-1968 if you run
    "LC_CTYPE=C locale charmap".