[seed] libseed: Attempting to connect a signal to something which is not a function should throw a signal a

[Robert Carr <racarr src gnome org>]

commit 774cc2f5e705a2333cc12d8d3a550ced6c8251e3
Author: Robert Carr <racarr svn gnome org>
Date:   Wed May 13 00:27:14 2009 -0400

    libseed: Attempting to connect a signal to something which is not a function should throw a signal at CONNECTION time
---
 libseed/seed-signals.c |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/libseed/seed-signals.c b/libseed/seed-signals.c
index 3865b72..8a9a008 100644
--- a/libseed/seed-signals.c
+++ b/libseed/seed-signals.c
@@ -96,6 +96,17 @@ seed_gobject_signal_connect_by_name (JSContextRef ctx,
       return JSValueMakeNull (ctx);
     }
 
+  if (JSValueIsNull (ctx, arguments[1]) || 
+      !JSValueIsObject (ctx, arguments[1]) || 
+      !JSObjectIsFunction (ctx, (JSObjectRef) arguments[1]))
+    {
+      seed_make_exception (ctx, exception, "ArgumentError",
+			   "Signal connection by name "
+			   "requires a function"
+			   " as second argument");
+      return JSValueMakeNull (ctx);
+    }
+
   if (argumentCount == 3)
     {
       user_data = (JSObjectRef) arguments[2];
@@ -289,6 +300,16 @@ seed_gobject_signal_connect_on_property (JSContextRef ctx,
 
       return JSValueMakeNull (ctx);
     }
+  
+  if (JSValueIsNull (ctx, arguments[0]) || 
+      !JSValueIsObject (ctx, arguments[0]) || 
+      !JSObjectIsFunction (ctx, (JSObjectRef) arguments[0]))
+    {
+      seed_make_exception (ctx, exception, "ArgumentError",
+			   "Signal connection requires a function"
+			   " as first argument");
+      return JSValueMakeNull (ctx);
+    }
 
   if (argumentCount == 1)
     seed_gobject_signal_connect (ctx, privates->signal_name,