Fix bug#5395: typing '#' in an empty C buffer throws "args out of range".

* progmodes/cc-defs.el: (c-set-cpp-delimiters, c-clear-cpp-delimiters):
Check for EOB playing the role of delimiter.

2 files changed, 11 insertions, 2 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index f9e55700c10..4b34373f2d3 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2010-01-19  Alan Mackenzie  <acm@muc.de>
+
+        * progmodes/cc-defs.el: Fix bug#5395: typing '#' in an empty
+        buffer throws "args out of range".
+        (c-set-cpp-delimiters, c-clear-cpp-delimiters): Check for EOB
+        playing the role of delimiter.
+
 2010-01-18  Stephen Leake  <stephen_leake@member.fsf.org>
 
         * lisp/progmodes/ada-mode.el: Fix bug#5400.
diff --git a/lisp/progmodes/cc-defs.el b/lisp/progmodes/cc-defs.el
index de0cd896b8e..bb91dee6ce8 100644
--- a/lisp/progmodes/cc-defs.el
+++ b/lisp/progmodes/cc-defs.el
@@ -1217,12 +1217,14 @@ been put there by c-put-char-property.  POINT remains unchanged."
   ;; This macro does a hidden buffer change.
   `(progn
      (c-put-char-property ,beg 'category 'c-cpp-delimiter)
-     (c-put-char-property ,end 'category 'c-cpp-delimiter)))
+     (if (< ,end (point-max))
+         (c-put-char-property ,end 'category 'c-cpp-delimiter))))
 (defmacro c-clear-cpp-delimiters (beg end)
   ;; This macro does a hidden buffer change.
   `(progn
      (c-clear-char-property ,beg 'category)
-     (c-clear-char-property ,end 'category)))
+     (if (< ,end (point-max))
+         (c-clear-char-property ,end 'category))))
 
 (defsubst c-comment-out-cpps ()
   ;; Render all preprocessor constructs syntactically commented out.