Add tolower_nofilter function

Author: prefiks

c_src/stringprep.cpp

@@ -516,12 +516,18 @@ static ERL_NIF_TERM to_lower(ErlNifEnv *env, int argc,
   return prep(env, argc, argv, ACMask, 1);
 }
 
+static ERL_NIF_TERM to_lower_no_filter(ErlNifEnv *env, int argc,
+							 const ERL_NIF_TERM argv[]) {
+  return prep(env, argc, argv, 0, 1);
+}
+
 static ErlNifFunc nif_funcs[] =
 	{
 		{"nodeprep", 1, nodeprep},
 		{"nameprep", 1, nameprep},
 		{"resourceprep", 1, resourceprep},
-		{"tolower", 1, to_lower}
+		{"tolower", 1, to_lower},
+		{"tolower_nofilter", 1, to_lower_no_filter}
 	};
 
 ERL_NIF_INIT(stringprep, nif_funcs, load, NULL, NULL, NULL)

src/stringprep.erl

@@ -28,7 +28,7 @@
 -compile(no_native).
 
 -export([start/0, load_nif/0, tolower/1, nameprep/1,
-	 nodeprep/1, resourceprep/1]).
+	 nodeprep/1, resourceprep/1, tolower_nofilter/1]).
 
 %%%===================================================================
 %%% API functions
@@ -51,6 +51,10 @@ load_nif() ->
 tolower(_String) ->
     erlang:nif_error(nif_not_loaded).
 
+-spec tolower_nofilter(iodata()) -> binary() | error.
+tolower_nofilter(_String) ->
+    erlang:nif_error(nif_not_loaded).
+
 -spec nameprep(iodata()) -> binary() | error.
 nameprep(_String) ->
     erlang:nif_error(nif_not_loaded).