2 files changed, 20 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_nif.c b/erts/emulator/beam/erl_nif.c
index a07aa2e81f..4a3b0ad8ca 100644
--- a/erts/emulator/beam/erl_nif.c
+++ b/erts/emulator/beam/erl_nif.c
@@ -601,6 +601,15 @@ int enif_get_double(ErlNifEnv* env, Eterm term, double* dp)
     return 1;
 }
 
+int enif_get_atom_length(ErlNifEnv* env, Eterm atom, unsigned* len)
+{
+    Atom* ap;
+    if (is_not_atom(atom)) return 0;
+    ap = atom_tab(atom_val(atom));
+    *len = ap->len;
+    return 1;
+}
+
 int enif_get_list_cell(ErlNifEnv* env, Eterm term, Eterm* head, Eterm* tail)
 {
     Eterm* val;
@@ -611,6 +620,13 @@ int enif_get_list_cell(ErlNifEnv* env, Eterm term, Eterm* head, Eterm* tail)
     return 1;
 }
 
+int enif_get_list_length(ErlNifEnv* env, Eterm term, unsigned* len)
+{
+    if (is_not_list(term) && is_not_nil(term)) return 0;
+    *len = list_length(term);
+    return 1;
+}
+
 ERL_NIF_TERM enif_make_int(ErlNifEnv* env, int i)
 {
 #if SIZEOF_INT == ERTS_SIZEOF_ETERM
diff --git a/erts/emulator/beam/erl_nif_api_funcs.h b/erts/emulator/beam/erl_nif_api_funcs.h
index 1ef27c3df3..4d025567ad 100644
--- a/erts/emulator/beam/erl_nif_api_funcs.h
+++ b/erts/emulator/beam/erl_nif_api_funcs.h
@@ -108,6 +108,8 @@ ERL_NIF_API_FUNC_DECL(unsigned,enif_sizeof_resource,(ErlNifEnv*, void* obj));
 ERL_NIF_API_FUNC_DECL(unsigned char*,enif_make_new_binary,(ErlNifEnv*,unsigned size,ERL_NIF_TERM* termp));
 ERL_NIF_API_FUNC_DECL(int,enif_is_list,(ErlNifEnv*, ERL_NIF_TERM term));
 ERL_NIF_API_FUNC_DECL(int,enif_is_tuple,(ErlNifEnv*, ERL_NIF_TERM term));
+ERL_NIF_API_FUNC_DECL(int,enif_get_atom_length,(ErlNifEnv*, ERL_NIF_TERM atom, unsigned* len));
+ERL_NIF_API_FUNC_DECL(int,enif_get_list_length,(ErlNifEnv* env, ERL_NIF_TERM term, unsigned* len));
 
 /*
 ** Add last to keep compatibility on Windows!!!
@@ -202,6 +204,8 @@ ERL_NIF_API_FUNC_DECL(int,enif_is_tuple,(ErlNifEnv*, ERL_NIF_TERM term));
 #  define enif_make_new_binary ERL_NIF_API_FUNC_MACRO(enif_make_new_binary)
 #  define enif_is_list ERL_NIF_API_FUNC_MACRO(enif_is_list)
 #  define enif_is_tuple ERL_NIF_API_FUNC_MACRO(enif_is_tuple)
+#  define enif_get_atom_length ERL_NIF_API_FUNC_MACRO(enif_get_atom_length)
+#  define enif_get_list_length ERL_NIF_API_FUNC_MACRO(enif_get_list_length)
 #endif
 
 #ifndef enif_make_list1