# HG changeset patch
# User John W. Eaton <jwe@octave.org>
# Date 1346890940 14400
# Node ID b516da00c5e44e78f9dd42c6af2b8690d3ec660b
# Parent  ec3a9ff6c37529f81d56aa9674709bfda6fcc9ee
don't insert unknonwn parameters in internal octave_config_info struct

* toplev.cc (Foctave_config_info): Check that field exists before
attempting to access contents.

diff -r ec3a9ff6c375 -r b516da00c5e4 libinterp/interpfcn/toplev.cc
--- a/libinterp/interpfcn/toplev.cc	Wed Sep 05 16:59:19 2012 -0700
+++ b/libinterp/interpfcn/toplev.cc	Wed Sep 05 20:22:20 2012 -0400
@@ -1474,12 +1474,17 @@
 
       if (! error_state)
         {
-          Cell c = m.contents (arg.c_str ());
+          if (m.isfield (arg))
+            {
+              Cell c = m.contents (arg);
 
-          if (c.is_empty ())
-            error ("octave_config_info: no info for `%s'", arg.c_str ());
+              if (c.is_empty ())
+                error ("octave_config_info: no info for `%s'", arg.c_str ());
+              else
+                retval = c(0);
+            }
           else
-            retval = c(0);
+            error ("octave_config_info: invalid parameter `%s'", arg.c_str ());
         }
     }
   else if (nargin == 0)