Revision: miles@gnu.org--gnu-2004/emacs--unicode--0--patch-15

Merge from emacs--cvs-trunk--0

Patches applied:

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-218
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-220
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-221
   Restore deleted tagline in etc/TUTORIAL.ru

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-222
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-228
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-229
   Remove TeX output files from the archive

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-230
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-247
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-248
   src/lisp.h (CYCLE_CHECK): Macro moved from xfaces.c

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-249
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-256
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-258
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-263
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-264
   Update from CVS: lispref/display.texi: emacs -> Emacs.

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-265
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-274
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-275
   Update from CVS: man/makefile.w32-in: Revert last change

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-276
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-295
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-296
   Allow restarting an existing debugger session that's exited

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-297
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-299
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-300
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-327
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-328
   Update from CVS: src/.gdbinit (xsymbol): Fix last change.

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-329
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-344
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-345
   Tweak source regexps so that building in place won't cause problems

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-346
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-351
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-352
   Update from CVS: lisp/flymake.el: New file.

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-353
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-361
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-362
   Support " [...]" style defaults in minibuffer-electric-default-mode

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-363
   (read-number): Use canonical format for default in prompt.

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-364
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-367
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-368
   Improve display-supports-face-attributes-p on non-ttys

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-369
   Rewrite face-differs-from-default-p

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-370
   Move `display-supports-face-attributes-p' entirely into C code

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-371
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-372
   Simplify face-differs-from-default-p; don't consider :stipple.

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-373
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-374
   (tty_supports_face_attributes_p): Ensure attributes differ from default

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-375
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-376
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-377
   (Fdisplay_supports_face_attributes_p): Work around bootstrapping problem

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-378
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-380
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-381
   Face merging cleanups

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-382
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-384
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-385
   src/xfaces.c (push_named_merge_point): Return 0 if a cycle is detected

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-386
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-395
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-396
   Tweak arch tagging to make build/install-in-place less annoying

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-397
   Work around vc-arch problems when building eshell

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-398
   Tweak permissions

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-399
   Tweak directory permissions

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-400
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-401
   More build-in-place tweaking of arch tagging

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-402
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-403
   Yet more build-in-place tweaking of arch tagging

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-404
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-409
   Update from CVS

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-410
   Make sure image types are initialized for lookup too

 * miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-411
 - miles@gnu.org--gnu-2004/emacs--cvs-trunk--0--patch-416
   Update from CVS

1 files changed, 16 insertions, 6 deletions

diff --git a/src/undo.c b/src/undo.c
index dd086db6c40..9fdc46a3b13 100644
--- a/src/undo.c
+++ b/src/undo.c
@@ -292,14 +292,15 @@ but another undo command will undo to the previous boundary.  */)
 
 /* At garbage collection time, make an undo list shorter at the end,
    returning the truncated list.
-   MINSIZE and MAXSIZE are the limits on size allowed, as described below.
-   In practice, these are the values of undo-limit and
-   undo-strong-limit.  */
+   MINSIZE, MAXSIZE and LIMITSIZE are the limits on size allowed,
+   as described below.
+   In practice, these are the values of undo-limit,
+   undo-strong-limit, and undo-outer-limit.  */
 
 Lisp_Object
-truncate_undo_list (list, minsize, maxsize)
+truncate_undo_list (list, minsize, maxsize, limitsize)
      Lisp_Object list;
-     int minsize, maxsize;
+     int minsize, maxsize, limitsize;
 {
   Lisp_Object prev, next, last_boundary;
   int size_so_far = 0;
@@ -308,7 +309,8 @@ truncate_undo_list (list, minsize, maxsize)
   next = list;
   last_boundary = Qnil;
 
-  /* Always preserve at least the most recent undo record.
+  /* Always preserve at least the most recent undo record
+     unless it is really horribly big.
      If the first element is an undo boundary, skip past it.
 
      Skip, skip, skip the undo, skip, skip, skip the undo,
@@ -323,6 +325,7 @@ truncate_undo_list (list, minsize, maxsize)
       prev = next;
       next = XCDR (next);
     }
+
   while (CONSP (next) && ! NILP (XCAR (next)))
     {
       Lisp_Object elt;
@@ -338,13 +341,20 @@ truncate_undo_list (list, minsize, maxsize)
                             + SCHARS (XCAR (elt)));
         }
 
+      /* If we reach LIMITSIZE before the first boundary,
+         we're heading for memory full, so truncate the list to nothing.  */
+      if (size_so_far > limitsize)
+        return Qnil;
+
       /* Advance to next element.  */
       prev = next;
       next = XCDR (next);
     }
+
   if (CONSP (next))
     last_boundary = prev;
 
+  /* Keep more if it fits.  */
   while (CONSP (next))
     {
       Lisp_Object elt;