Add support for simple run of "main"

native_client_sdk/src/examples/hello_world_stdio/hello_world.c

Index: native_client_sdk/src/examples/hello_world_stdio/hello_world.c
diff --git a/native_client_sdk/src/examples/hello_world_stdio/hello_world.c b/native_client_sdk/src/examples/hello_world_stdio/hello_world.c
index 2771be0ae8c6c86f401d5117ddc98cd8874372e6..0d2faf14b5de91858d687f128bf742e387c2628d 100644
--- a/native_client_sdk/src/examples/hello_world_stdio/hello_world.c
+++ b/native_client_sdk/src/examples/hello_world_stdio/hello_world.c
@@ -1,7 +1,11 @@
+/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
 #include <stdio.h>
 #include <string.h>
 
-
 #include "ppapi/c/ppb_var.h"
 #include "ppapi/c/ppb_messaging.h"
 #include "ppapi/c/ppb_console.h"
@@ -10,49 +14,12 @@
 
 
 // Have the Module object provided by ppapi_main create a basic
-// PPAPI instance with default arguments to setting up
-// stdio file handles, processing keyboard, etc...
-// PPAPI Instance with default arguments.
+// PPAPI instance with default arguments which mounts the dev
+// file system providing /dev/null, /dev/tty, and /devl/console3
+// for null STDIN, STDOUT directed to PostMessage and STDERR
+// directed to the JavaScript Console with LogLevel 'ERROR'
 PPAPI_MAIN_WITH_DEFAULT_ARGS
 
-static PPB_Messaging* ppb_messaging_interface = NULL;
-static PPB_Var* ppb_var_interface = NULL;
-static PPB_Console* ppb_console_interface = NULL;
-
-
-/**
- * Creates new string PP_Var from C string. The resulting object will be a
- * refcounted string object. It will be AddRef()ed for the caller. When the
- * caller is done with it, it should be Release()d.
- * @param[in] str C string to be converted to PP_Var
- * @return PP_Var containing string.
- */
-static struct PP_Var CStrToVar(const char* str) {
-  if (ppb_var_interface != NULL) {
-    return ppb_var_interface->VarFromUtf8(str, strlen(str));
-  }
-  return PP_MakeUndefined();
-}
-
-//
-// Post a message back to JavaScript
-//
-static void SendMessage(const char *str) {
-  PP_Instance instance = PPAPI_GetInstanceId();
-  if (ppb_messaging_interface)
-    ppb_messaging_interface->PostMessage(instance, CStrToVar(str));
-}
-
-//
-// Send a message to the JavaScript Console
-//
-static void LogMessage(const char *str) {
-  PP_Instance instance = PPAPI_GetInstanceId();
-  if (ppb_console_interface)
-    ppb_console_interface->Log(instance, PP_LOGLEVEL_LOG,
-                          CStrToVar(str));
-}
-
 //
 // The "main" entry point called by PPAPIInstance once initialization
 // takes place.  This is called off the main thread, which is hidden
@@ -64,15 +31,20 @@ static void LogMessage(const char *str) {
 // Where the embed tag for this module uses KEY=VALUE
 //
 int ppapi_main(int argc, const char *argv[]) {
-  ppb_messaging_interface =
-      (PPB_Messaging*) PPAPI_GetInterface(PPB_MESSAGING_INTERFACE);
-  ppb_var_interface =
-      (PPB_Var*) PPAPI_GetInterface(PPB_VAR_INTERFACE);
-  ppb_console_interface =
-      (PPB_Console*) PPAPI_GetInterface(PPB_CONSOLE_INTERFACE);
+  int index = 1;
 
-  SendMessage("Hello World STDIO.\n");
-  LogMessage("Hello World STDERR.\n");
+  // Use PostMessage to send "Hello World" to JavaScript.
+  printf("Hello World STDIO.\n");
 
+  // Use PPAPI Console interface to send "Hello World" to the
+  // JavaScript Console.
+  fprintf(stderr, "Hello World STDERR.\n");
+
+  // Print the arguments we received from the web page
+  printf("NAME: %s\n", argv[0]);
+  while (index + 2 < argc) {
+    printf("  ARGS: %s=%s\n", argv[index+0], argv[index+1]);
+    index += 2;
+  }
   return 0;
 }