1 files changed, 45 insertions, 0 deletions
diff --git a/lib/erl_interface/src/decode/decode_list_header.c b/lib/erl_interface/src/decode/decode_list_header.c
new file mode 100644
index 0000000000..dda711f9fd
--- /dev/null
+++ b/lib/erl_interface/src/decode/decode_list_header.c
@@ -0,0 +1,45 @@
+/*
+ * %CopyrightBegin%
+ * 
+ * Copyright Ericsson AB 1998-2009. All Rights Reserved.
+ * 
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ * 
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * %CopyrightEnd%
+ */
+#include "eidef.h"
+#include "eiext.h"
+#include "putget.h"
+
+int ei_decode_list_header(const char *buf, int *index, int *arity)
+{
+  const char *s = buf + *index;
+  const char *s0 = s;
+
+  switch (get8(s)) {
+  case ERL_NIL_EXT:
+    if (arity) *arity = 0;
+    break;
+    
+  case ERL_LIST_EXT:
+    if (arity) *arity = get32be(s);
+    else s+= 4;
+    break;
+
+  default:
+    return -1;
+  }
+  
+  *index += s-s0; 
+
+  return 0;
+}