From 0cebc347f8923142028d18d3a7e2d1cdd6f3c750 Mon Sep 17 00:00:00 2001
From: Pierre Fenoll <pierrefenoll@gmail.com>
Date: Fri, 20 Apr 2018 15:13:37 +0200
Subject: [PATCH] fail when trying to encode atom 'undefined'

---
 c_src/encoder.c | 3 +++
 c_src/jiffy.c   | 1 +
 c_src/jiffy.h   | 1 +
 3 files changed, 5 insertions(+)

diff --git a/c_src/encoder.c b/c_src/encoder.c
index afc3c14..b9d4040 100644
--- a/c_src/encoder.c
+++ b/c_src/encoder.c
@@ -759,6 +759,9 @@ encode_iter(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
                 ret = enc_error(e, "false");
                 goto done;
             }
+        } else if(enif_compare(curr, e->atoms->atom_undefined) == 0) {
+            ret = enc_obj_error(e, "invalid_ejson", curr);
+            goto done;
         } else if(enif_is_binary(env, curr)) {
             if(!enc_string(e, curr)) {
                 ret = enc_obj_error(e, "invalid_string", curr);
diff --git a/c_src/jiffy.c b/c_src/jiffy.c
index 03ded3e..d0088d2 100644
--- a/c_src/jiffy.c
+++ b/c_src/jiffy.c
@@ -34,6 +34,7 @@ load(ErlNifEnv* env, void** priv, ERL_NIF_TERM info)
     st->atom_escape_forward_slashes = make_atom(env, "escape_forward_slashes");
     st->atom_dedupe_keys = make_atom(env, "dedupe_keys");
     st->atom_copy_strings = make_atom(env, "copy_strings");
+    st->atom_undefined = make_atom(env, "undefined");
 
     // Markers used in encoding
     st->ref_object = make_atom(env, "$object_ref$");
diff --git a/c_src/jiffy.h b/c_src/jiffy.h
index ef03a06..9aa1335 100644
--- a/c_src/jiffy.h
+++ b/c_src/jiffy.h
@@ -37,6 +37,7 @@ typedef struct {
     ERL_NIF_TERM    atom_escape_forward_slashes;
     ERL_NIF_TERM    atom_dedupe_keys;
     ERL_NIF_TERM    atom_copy_strings;
+    ERL_NIF_TERM    atom_undefined;
 
     ERL_NIF_TERM    ref_object;
     ERL_NIF_TERM    ref_array;