# HG changeset patch
# User Jaroslav Hajek <highegg@gmail.com>
# Date 1269588244 -3600
# Node ID 13c1f15c67fae00c99ecff3ddd202d20535ab376
# Parent  c0c24219fccf650cf91dda14f48f46f20c925016
guard against recursive calls of missing_function_hook

diff --git a/src/ChangeLog b/src/ChangeLog
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,8 @@
+2010-03-26  Jaroslav Hajek  <highegg@gmail.com>
+
+	* variables.cc (maybe_missing_function_hook): Temporarily clear before
+	executing the hook to avoid recursive calls.
+
 2010-03-25  John W. Eaton  <jwe@octave.org>
 
 	* gl2ps-renderer.cc (glps_renderer::draw): Tag call to fclose
diff --git a/src/variables.cc b/src/variables.cc
--- a/src/variables.cc
+++ b/src/variables.cc
@@ -2394,5 +2394,16 @@
 {
   // Don't do this if we're handling errors.
   if (buffer_error_messages == 0 && ! Vmissing_function_hook.empty ())
-    feval (Vmissing_function_hook, octave_value (name));
+    {
+      // Ensure auto-restoration.
+      unwind_protect frame;
+      frame.protect_var (Vmissing_function_hook);
+
+      // Clear the variable prior to calling the function.
+      const std::string func_name = Vmissing_function_hook;
+      Vmissing_function_hook.clear ();
+
+      // Call.
+      feval (func_name, octave_value (name));
+    }
 }