Fix dialyzer warnings

src/esqlite.app.src

@@ -1,7 +1,7 @@
 {application, esqlite,
  [
   {description, "sqlite nif interface"},
-  {vsn, "0.1.0"},
+  {vsn, "0.1.1"},
   {modules, [esqlite3, esqlite3_nif]},
   {registered, []},
   {applications, [

src/esqlite3.erl

@@ -172,18 +172,25 @@ fetchone(Statement) ->
     end.
 
 %%
--spec fetchall(statement()) -> list(tuple()).
+-spec fetchall(statement()) ->
+                      list(tuple()) |
+                      {error, term()}.
 fetchall(Statement) ->
     case try_step(Statement, 0) of
         '$done' ->
             [];
         {error, _} = E -> E;
         {row, Row} ->
-            [Row | fetchall(Statement)]
+            case fetchall(Statement) of
+                {error, _} = E -> E;
+                Rest -> [Row | Rest]
+            end
     end.
 
 %% Try the step, when the database is busy,
--spec try_step(statement(), non_neg_integer()) -> term().
+-spec try_step(statement(), non_neg_integer()) -> 
+                      '$done' |
+                      term().
 try_step(_Statement, Tries) when Tries > 5 ->
     throw(too_many_tries);
 try_step(Statement, Tries) ->
@@ -267,6 +274,7 @@ step(Stmt) ->
 %% @doc
 %%
 %% @spec step(prepared_statement(), timeout()) -> tuple()
+-spec step(term(), timeout()) -> tuple() | '$busy' | '$done'.
 step(Stmt, Timeout) ->
     Ref = make_ref(),
     ok = esqlite3_nif:step(Stmt, Ref, self()),

src/esqlite3_nif.erl

@@ -34,7 +34,7 @@
          column_names/3,
          column_types/3,
          close/3
-]).
+        ]).
 
 -on_load(init/0).
 
@@ -50,7 +50,7 @@ init() ->
 %%
 %% @spec start() -> {ok, connection()} | {error, msg()}
 start() ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc Open the specified sqlite3 database.
 %%
@@ -58,8 +58,9 @@ start() ->
 %% ok immediately. When the database is opened
 %%
 %%  @spec open(connection(), reference(), pid(), string()) -> ok | {error, message()}
+
 open(_Db, _Ref, _Dest, _Filename) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc Exec the query.
 %%
@@ -71,7 +72,7 @@ open(_Db, _Ref, _Dest, _Filename) ->
 %%
 %%  @spec exec(connection(), Ref::reference(), Dest::pid(), string()) -> ok | {error, message()}
 exec(_Db, _Ref, _Dest, _Sql) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc Get the number of affected rows of last statement
 %%
@@ -79,62 +80,59 @@ exec(_Db, _Ref, _Dest, _Sql) ->
 %% with answer() integer | {error, reason()}
 %%
 changes(_Db, _Ref, _Dest) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc
 %%
 %% @spec prepare(connection(), reference(), pid(), string()) -> ok | {error, message()}
 prepare(_Db, _Ref, _Dest, _Sql) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc
 %%
 %% @spec step(statement(), reference(), pid()) -> ok | {error, message()}
 step(_Stmt, _Ref, _Dest) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc
 %%
 %% @spec reset(statement(), reference(), pid()) -> ok | {error, message()}
 reset(_Stmt, _Ref, _Dest) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc
 %%
 %%
 finalize(_Stmt, _Ref, _Dest) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc Bind parameters to a prepared statement.
 %%
 %% @spec bind(statement(), reference(), pid(), []) -> ok | {error, message()}
 bind(_Stmt, _Ref, _Dest, _Args) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc Retrieve the column names of the prepared statement
 %%
 %% @spec column_names(statement(), reference(), pid()) -> {ok, tuple()} | {error, message()}
 column_names(_Stmt, _Ref, _Dest) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc Retrieve the column types of the prepared statement
 %%
 %% @spec column_types(statement(), reference(), pid()) -> {ok, tuple()} | {error, message()}
 column_types(_Stmt, _Ref, _Dest) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 %% @doc Close the connection.
 %%
 %% @spec close(connection(), reference(), pid()) -> ok | {error, message()}
 close(_Db, _Ref, _Dest) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
 
 
 %% @doc Insert record
 %%
 %% @spec insert(connection(), Ref::reference(), Dest::pid(), string()) -> {ok, integer()} | {error, message()}
 insert(_Db, _Ref, _Dest, _Sql) ->
-    exit(nif_library_not_loaded).
+    erlang:nif_error(nif_library_not_loaded).
-
-
-