n-api: re-write test_make_callback

This re-writes the test in C by dropping std::vector<napi_value> in
favour of a C99 variable length array, and by dropping the anonymous
namespace in favour of static function declarations.

Backport-PR-URL: #19447
PR-URL: #19448
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

Author: Gabriel Schulhof

test/addons-napi/test_make_callback/binding.cc renamed to test/addons-napi/test_make_callback/binding.c

@@ -1,23 +1,23 @@
 #include <node_api.h>
 #include "../common.h"
-#include <vector>
 
-namespace {
+#define MAX_ARGUMENTS 10
 
+static
 napi_value MakeCallback(napi_env env, napi_callback_info info) {
-  const int kMaxArgs = 10;
-  size_t argc = kMaxArgs;
-  napi_value args[kMaxArgs];
+  size_t argc = MAX_ARGUMENTS;
+  size_t n;
+  napi_value args[MAX_ARGUMENTS];
   NAPI_CALL(env, napi_get_cb_info(env, info, &argc, args, NULL, NULL));
 
   NAPI_ASSERT(env, argc > 0, "Wrong number of arguments");
 
   napi_value recv = args[0];
   napi_value func = args[1];
 
-  std::vector<napi_value> argv;
-  for (size_t n = 2; n < argc; n += 1) {
-    argv.push_back(args[n]);
+  napi_value argv[MAX_ARGUMENTS - 2];
+  for (n = 2; n < argc; n += 1) {
+    argv[n - 2] = args[n];
   }
 
   napi_valuetype func_type;
@@ -34,7 +34,7 @@ napi_value MakeCallback(napi_env env, napi_callback_info info) {
   napi_value result;
   if (func_type == napi_function) {
     NAPI_CALL(env, napi_make_callback(
-        env, context, recv, func, argv.size(), argv.data(), &result));
+        env, context, recv, func, argc - 2, argv, &result));
   } else {
     NAPI_ASSERT(env, false, "Unexpected argument type");
   }
@@ -44,6 +44,7 @@ napi_value MakeCallback(napi_env env, napi_callback_info info) {
   return result;
 }
 
+static
 napi_value Init(napi_env env, napi_value exports) {
   napi_value fn;
   NAPI_CALL(env, napi_create_function(
@@ -52,6 +53,4 @@ napi_value Init(napi_env env, napi_value exports) {
   return exports;
 }
 
-}  // namespace
-
 NAPI_MODULE(binding, Init)

test/addons-napi/test_make_callback/binding.gyp

@@ -3,7 +3,7 @@
     {
       'target_name': 'binding',
       'defines': [ 'V8_DEPRECATION_WARNINGS=1' ],
-      'sources': [ 'binding.cc' ]
+      'sources': [ 'binding.c' ]
     }
   ]
 }