make it possible to replace the probabilities while reading a new .pgf

src/runtime/c/pgf/namespace.h

@@ -407,6 +407,33 @@ void namespace_iter(Namespace<V> map, PgfItor* itor, PgfExn *err)
         return;
 }
 
+template <class V,class A>
+void namespace_vec_fill_names(Namespace<V> node, size_t offs, Vector<A> *vec)
+{
+    if (node == 0)
+        return;
+
+    namespace_vec_fill_names(node->left,  offs, vec);
+
+    offs += namespace_size(node->left);
+    vector_elem(vec, offs++)->name = &node->value->name;
+
+    namespace_vec_fill_names(node->right, offs, vec);
+}
+
+template <class V,class A>
+Vector<A> *namespace_to_sorted_names(Namespace<V> node)
+{
+    Vector<A> *vec = (Vector<A> *)
+        malloc(sizeof(Vector<A>)+node->sz*sizeof(A));
+    if (errno != 0)
+        throw pgf_systemerror(errno);
+    vec->len = node->sz;
+    memset(vec->data, 0, node->sz*sizeof(A));
+    namespace_vec_fill_names(node, 0, vec);
+    return vec;
+}
+
 template <class V>
 void namespace_release(Namespace<V> node)
 {