erts: Add tests for enif_snprintf

2 files changed, 33 insertions, 4 deletions

diff --git a/erts/emulator/test/nif_SUITE.erl b/erts/emulator/test/nif_SUITE.erl
index a7767132ee..e764071415 100644
--- a/erts/emulator/test/nif_SUITE.erl
+++ b/erts/emulator/test/nif_SUITE.erl
@@ -46,7 +46,8 @@
          nif_now_time/1, nif_cpu_time/1, nif_unique_integer/1,
          nif_is_process_alive/1, nif_is_port_alive/1,
          nif_term_to_binary/1, nif_binary_to_term/1,
-         nif_port_command/1
+         nif_port_command/1,
+         nif_snprintf/1
 	]).
 
 -export([many_args_100/100]).
@@ -81,8 +82,8 @@ all() ->
      nif_now_time, nif_cpu_time, nif_unique_integer,
      nif_is_process_alive, nif_is_port_alive,
      nif_term_to_binary, nif_binary_to_term,
-     nif_port_command
-    ].
+     nif_port_command,
+     nif_snprintf].
 
 init_per_testcase(_Case, Config) ->
     Config.
@@ -2024,9 +2025,18 @@ nif_port_command(Config) ->
     port_close(Port),
 
     {'EXIT', {badarg, _}} = (catch port_command_nif(Port, "hello\n")),
+    ok.
 
+nif_snprintf(Config) ->
+    ensure_lib_loaded(Config),
+    <<"ok",0>> = format_term_nif(3,ok),
+    <<"o",0>>  = format_term_nif(2,ok),
+    <<"\"hello world\"",0>> = format_term_nif(14,"hello world"),
+    <<"{{hello,world,-33},3.14",_/binary>> = format_term_nif(50,{{hello,world, -33}, 3.14, self()}),
+    <<"{{hello,world,-33},",0>> = format_term_nif(20,{{hello,world, -33}, 3.14, self()}),
     ok.
 
+
 %% The NIFs:
 lib_version() -> undefined.
 call_history() -> ?nif_stub.
@@ -2091,6 +2101,7 @@ is_port_alive_nif(_) -> ?nif_stub.
 term_to_binary_nif(_, _) -> ?nif_stub.
 binary_to_term_nif(_, _, _) -> ?nif_stub.
 port_command_nif(_, _) -> ?nif_stub.
+format_term_nif(_,_) -> ?nif_stub.
 
 %% maps
 is_map_nif(_) -> ?nif_stub.
diff --git a/erts/emulator/test/nif_SUITE_data/nif_SUITE.c b/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
index 11e5dab58e..951b6959a8 100644
--- a/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
+++ b/erts/emulator/test/nif_SUITE_data/nif_SUITE.c
@@ -2109,6 +2109,23 @@ static ERL_NIF_TERM port_command(ErlNifEnv* env, int argc, const ERL_NIF_TERM ar
     return atom_true;
 }
 
+static ERL_NIF_TERM format_term(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
+{
+    ErlNifBinary obin;
+    unsigned int size;
+
+    if (!enif_get_uint(env, argv[0], &size))
+	return enif_make_badarg(env);
+    if (!enif_alloc_binary(size,&obin))
+	return enif_make_badarg(env);
+
+    if (enif_snprintf((char*)obin.data, (size_t)size, "%T", argv[1]) < 0)
+        return atom_false;
+
+    return enif_make_binary(env,&obin);
+}
+
+
 static ErlNifFunc nif_funcs[] =
 {
     {"lib_version", 0, lib_version},
@@ -2190,7 +2207,8 @@ static ErlNifFunc nif_funcs[] =
     {"is_port_alive_nif", 1, is_port_alive},
     {"term_to_binary_nif", 2, term_to_binary},
     {"binary_to_term_nif", 3, binary_to_term},
-    {"port_command_nif", 2, port_command}
+    {"port_command_nif", 2, port_command},
+    {"format_term_nif", 2, format_term}
 };
 
 ERL_NIF_INIT(nif_SUITE,nif_funcs,load,reload,upgrade,unload)