Add --console switch for Windows

Windows subsystem does not work like console subsystem which makes it almost impossible to obtain `stdout` until the application has finished. This adds a `--console` switch to make the game either attach to an existing console or show a new one and redirect the C streams to it.

src/cmdline/RootCommands.cpp

@@ -30,10 +30,26 @@ extern "C"
 #include "../network/network.h"
 #include "CommandLine.hpp"
 
+#ifdef USE_BREAKPAD
+#define IMPLIES_SILENT_BREAKPAD ", implies --silent-breakpad"
+#else
+#define IMPLIES_SILENT_BREAKPAD
+#endif // USE_BREAKPAD
+
+#if defined(__WINDOWS__) && !defined(DEBUG)
+    #define __PROVIDE_CONSOLE__ 1
+#endif // defined(__WINDOWS__) && !defined(DEBUG)
+
 #ifndef DISABLE_NETWORK
 int  gNetworkStart = NETWORK_MODE_NONE;
 char gNetworkStartHost[128];
 int  gNetworkStartPort = NETWORK_DEFAULT_PORT;
+
+static uint32 _port            = 0;
+#endif
+
+#ifdef __PROVIDE_CONSOLE__
+    static bool _provideConsole;
 #endif
 
 static bool   _help            = false;
@@ -43,21 +59,12 @@ static bool   _all             = false;
 static bool   _about           = false;
 static bool   _verbose         = false;
 static bool   _headless        = false;
-#ifndef DISABLE_NETWORK
-static uint32 _port            = 0;
-#endif
 static utf8 * _password        = nullptr;
 static utf8 * _userDataPath    = nullptr;
 static utf8 * _openrctDataPath = nullptr;
 static utf8 * _rct2DataPath    = nullptr;
 static bool   _silentBreakpad  = false;
 
-#ifdef USE_BREAKPAD
-#define IMPLIES_SILENT_BREAKPAD ", implies --silent-breakpad"
-#else
-#define IMPLIES_SILENT_BREAKPAD
-#endif // USE_BREAKPAD
-
 static const CommandLineOptionDefinition StandardOptions[]
 {
     { CMDLINE_TYPE_SWITCH,  &_help,            'h', "help",              "show this help message and exit"                            },
@@ -67,6 +74,9 @@ static const CommandLineOptionDefinition StandardOptions[]
     { CMDLINE_TYPE_SWITCH,  &_about,           NAC, "about",             "show information about " OPENRCT2_NAME                      },
     { CMDLINE_TYPE_SWITCH,  &_verbose,         NAC, "verbose",           "log verbose messages"                                       },
     { CMDLINE_TYPE_SWITCH,  &_headless,        NAC, "headless",          "run " OPENRCT2_NAME " headless" IMPLIES_SILENT_BREAKPAD     },
+#ifdef __PROVIDE_CONSOLE__
+    { CMDLINE_TYPE_SWITCH,  &_provideConsole,  NAC, "console",           "creates a new or attaches to an existing console window for standard output" },
+#endif
 #ifndef DISABLE_NETWORK
     { CMDLINE_TYPE_INTEGER, &_port,            NAC, "port",              "port to use for hosting or joining a server"                },
 #endif
@@ -144,6 +154,13 @@ exitcode_t CommandLine::HandleCommandDefault()
 {
     exitcode_t result = EXITCODE_CONTINUE;
 
+#ifdef __PROVIDE_CONSOLE__
+    if (_provideConsole)
+    {
+        platform_windows_open_console();
+    }
+#endif
+
     if (_about)
     {
         PrintAbout();

src/openrct2.c

@@ -661,17 +661,3 @@ static void openrct2_setup_rct2_hooks()
 {
 	// None for now
 }
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1900)
-/**
- * Temporary fix for libraries not compiled with VS2015
- */
-FILE **__iob_func()
-{
-	static FILE* streams[3];
-	streams[0] = stdin;
-	streams[1] = stdout;
-	streams[2] = stderr;
-	return streams;
-}
-#endif

src/platform/platform.h

@@ -203,6 +203,7 @@ datetime64 platform_get_datetime_now_utc();
 	#include <windows.h>
 	#undef GetMessage
 
+	void platform_windows_open_console();
 	int windows_get_registry_install_info(rct2_install_info *installInfo, char *source, char *font, uint8 charset);
 	HWND windows_get_window_handle();
 	void platform_setup_file_associations();

src/platform/windows.c

@@ -143,6 +143,17 @@ __declspec(dllexport) int StartOpenRCT(HINSTANCE hInstance, HINSTANCE hPrevInsta
 
 #endif // NO_RCT2
 
+void platform_windows_open_console()
+{
+	if (!AttachConsole(ATTACH_PARENT_PROCESS)) {
+		AllocConsole();
+	}
+
+	freopen("CONIN$", "r", stdin);
+	freopen("CONOUT$", "w", stdout);
+	freopen("CONOUT$", "w", stderr);
+}
+
 utf8 **windows_get_command_line_args(int *outNumArgs)
 {
 	int argc;