diff --git a/Minecraft.Client/Platform/Common/UI/UIController.cpp b/Minecraft.Client/Platform/Common/UI/UIController.cpp
index 05102f0f8..1ab74b80f 100644
--- a/Minecraft.Client/Platform/Common/UI/UIController.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIController.cpp
@@ -1203,6 +1203,8 @@ void UIController::setupCustomDrawGameState()
 	RenderManager.StartFrame();
 #elif defined __PSVITA__
 	RenderManager.StartFrame();
+#elif defined __linux__
+	RenderManager.StartFrame();
 #elif defined __ORBIS__
 	RenderManager.StartFrame(false);
 	// Set up a viewport for the render that matches Iggy's own viewport, apart form using an opengl-style z-range (Iggy uses a DX-style range on PS4), so
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene.cpp b/Minecraft.Client/Platform/Common/UI/UIScene.cpp
index e6127c8e4..3b7b11046 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene.cpp
@@ -283,7 +283,7 @@ void UIScene::loadMovie()
 #elif defined __PSVITA__
 	moviePath.append(L"Vita.swf");
 	m_loadedResolution = eSceneResolution_Vita;
-#elif defined _WINDOWS64 || defined __linux__
+#elif defined _WINDOWS64
 	if(ui.getScreenHeight() == 720)
 	{
 		moviePath.append(L"720.swf");
@@ -994,8 +994,7 @@ bool UIScene::allowRepeat(int key)
 
 void UIScene::externalCallback(IggyExternalFunctionCallUTF16 * call)
 {
-	if(wcscmp((wchar_t *)call->function_name.string,L"handlePress")==0)
-	{
+	if(std::char_traits<char16_t>::compare(call->function_name.string, u"handlePress", 12) == 0) {
 		if(call->num_arguments != 2)
 		{
 			app.DebugPrintf("Callback for handlePress did not have the correct number of arguments\n");
@@ -1014,7 +1013,7 @@ void UIScene::externalCallback(IggyExternalFunctionCallUTF16 * call)
 		}
 		handlePress(call->arguments[0].number, call->arguments[1].number);
 	}
-	else if(wcscmp((wchar_t *)call->function_name.string,L"handleFocusChange")==0)
+	else if(std::char_traits<char16_t>::compare(call->function_name.string, u"handleFocusChange", 18) == 0)
 	{
 		if(call->num_arguments != 2)
 		{
@@ -1034,7 +1033,7 @@ void UIScene::externalCallback(IggyExternalFunctionCallUTF16 * call)
 		}
 		_handleFocusChange(call->arguments[0].number, call->arguments[1].number);
 	}
-	else if(wcscmp((wchar_t *)call->function_name.string,L"handleInitFocus")==0)
+	else if(std::char_traits<char16_t>::compare(call->function_name.string, u"handleInitFocus", 16) == 0)
 	{
 		if(call->num_arguments != 2)
 		{
@@ -1054,7 +1053,7 @@ void UIScene::externalCallback(IggyExternalFunctionCallUTF16 * call)
 		}
 		_handleInitFocus(call->arguments[0].number, call->arguments[1].number);
 	}
-	else if(wcscmp((wchar_t *)call->function_name.string,L"handleCheckboxToggled")==0)
+	else if(std::char_traits<char16_t>::compare(call->function_name.string, u"handleCheckboxToggled", 22) == 0)
 	{
 		if(call->num_arguments != 2)
 		{
@@ -1074,7 +1073,7 @@ void UIScene::externalCallback(IggyExternalFunctionCallUTF16 * call)
 		}
 		handleCheckboxToggled(call->arguments[0].number, call->arguments[1].boolval);
 	}
-	else if(wcscmp((wchar_t *)call->function_name.string,L"handleSliderMove")==0)
+	else if(std::char_traits<char16_t>::compare(call->function_name.string, u"handleSliderMove", 17) == 0)
 	{
 		if(call->num_arguments != 2)
 		{
@@ -1094,7 +1093,7 @@ void UIScene::externalCallback(IggyExternalFunctionCallUTF16 * call)
 		}
 		handleSliderMove(call->arguments[0].number, call->arguments[1].number);
 	}
-	else if(wcscmp((wchar_t *)call->function_name.string,L"handleAnimationEnd")==0)
+	else if(std::char_traits<char16_t>::compare(call->function_name.string, u"handleAnimationEnd", 19) == 0)
 	{
 		if(call->num_arguments != 0)
 		{
@@ -1106,7 +1105,7 @@ void UIScene::externalCallback(IggyExternalFunctionCallUTF16 * call)
 		}
 		handleAnimationEnd();
 	}
-	else if(wcscmp((wchar_t *)call->function_name.string,L"handleSelectionChanged")==0)
+	else if(std::char_traits<char16_t>::compare(call->function_name.string, u"handleSelectionChanged", 23) == 0)
 	{
 		if(call->num_arguments != 1)
 		{
@@ -1126,7 +1125,7 @@ void UIScene::externalCallback(IggyExternalFunctionCallUTF16 * call)
 		}
 		handleSelectionChanged(call->arguments[0].number);
 	}
-	else if(wcscmp((wchar_t *)call->function_name.string,L"handleRequestMoreData")==0)
+	else if(std::char_traits<char16_t>::compare(call->function_name.string, u"handleRequestMoreData", 22) == 0)
 	{
 		if(call->num_arguments == 0)
 		{
@@ -1153,7 +1152,7 @@ void UIScene::externalCallback(IggyExternalFunctionCallUTF16 * call)
 			handleRequestMoreData(call->arguments[0].number, call->arguments[1].boolval);
 		}
 	}
-	else if(wcscmp((wchar_t *)call->function_name.string,L"handleTouchBoxRebuild")==0)
+	else if(std::char_traits<char16_t>::compare(call->function_name.string, u"handleTouchBoxRebuild", 22) == 0)
 	{
 		handleTouchBoxRebuild();
 	}
@@ -1248,3 +1247,25 @@ bool UIScene::isReadyToDelete()
 {
 	return true;
 }
+
+static int UIScene::parseSlotId(const char16_t *s) {
+	// must be nonnull, must start with 'slot_', first char after the underscore must be a digit
+	if (!s ||
+		(s[0] != u's' || s[1] != u'l' || s[2] != u'o' || s[3] != u't' ||
+		s[4] != u'_') ||
+		(s[5] < u'0' || s[5] > u'9')) {
+		return -1;
+	}
+
+	int i = 5;
+	int id = 0;
+
+	// keep consuming digits until we reach a non-digit. each digit scales the existing id value
+	// by 10 plus the actual digit value. (this is referred to as a 'number' by the way) 
+	while (s[i] >= u'0' && s[i] <= u'9') {
+		id = id * 10 + (s[i] - u'0');
+		i++;
+	}
+
+	return id;
+}
\ No newline at end of file
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene.h b/Minecraft.Client/Platform/Common/UI/UIScene.h
index 315229390..a2e3a8f61 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene.h
+++ b/Minecraft.Client/Platform/Common/UI/UIScene.h
@@ -267,4 +267,6 @@ protected:
 	size_t GetCallbackUniqueId();
 
 	virtual bool isReadyToDelete();
+
+	static int parseSlotId(const char16_t *s);
 };
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene_AbstractContainerMenu.cpp b/Minecraft.Client/Platform/Common/UI/UIScene_AbstractContainerMenu.cpp
index 7757e135d..ce233bf4a 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene_AbstractContainerMenu.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene_AbstractContainerMenu.cpp
@@ -222,15 +222,14 @@ void UIScene_AbstractContainerMenu::customDraw(IggyCustomDrawCallbackRegion *reg
 	if(pMinecraft->localplayers[m_iPad] == NULL || pMinecraft->localgameModes[m_iPad] == NULL) return;
 
 	std::shared_ptr<ItemInstance> item = nullptr;
-	if(wcscmp((wchar_t *)region->name,L"pointerIcon")==0)
+	if(std::char_traits<char16_t>::compare(region->name, u"pointerIcon", 11) == 0)
 	{		
 		m_cacheSlotRenders = false;
 		item = pMinecraft->localplayers[m_iPad]->inventory->getCarried();
 	}
 	else
 	{
-		int slotId = -1;
-		swscanf((wchar_t*)region->name,L"slot_%d",&slotId);
+		int slotId = parseSlotId(region->name);
 		if (slotId == -1)
 		{
 			app.DebugPrintf("This is not the control we are looking for\n");
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene_CraftingMenu.cpp b/Minecraft.Client/Platform/Common/UI/UIScene_CraftingMenu.cpp
index ba5673bbf..a15900d9a 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene_CraftingMenu.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene_CraftingMenu.cpp
@@ -436,11 +436,10 @@ void UIScene_CraftingMenu::customDraw(IggyCustomDrawCallbackRegion *region)
 	if(pMinecraft->localplayers[m_iPad] == NULL || pMinecraft->localgameModes[m_iPad] == NULL) return;
 
 	std::shared_ptr<ItemInstance> item = nullptr;
-	int slotId = -1;
 	float alpha = 1.0f;
 	bool decorations = true;
 	bool inventoryItem = false;
-	swscanf((wchar_t*)region->name,L"slot_%d",&slotId);
+	int slotId = parseSlotId(region->name);
 	if (slotId == -1)
 	{
 		app.DebugPrintf("This is not the control we are looking for\n");
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene_DebugOverlay.cpp b/Minecraft.Client/Platform/Common/UI/UIScene_DebugOverlay.cpp
index e9fabdfac..3ff5cacb5 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene_DebugOverlay.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene_DebugOverlay.cpp
@@ -120,6 +120,7 @@ void UIScene_DebugOverlay::customDraw(IggyCustomDrawCallbackRegion *region)
 	if(pMinecraft->localplayers[m_iPad] == NULL || pMinecraft->localgameModes[m_iPad] == NULL) return;
 
 	int itemId = -1;
+	// 4jcraft: TODO: UB on our platform since this casts char16_t* to wchar_t*
 	swscanf((wchar_t*)region->name,L"item_%d",&itemId);
 	if (itemId == -1 || itemId > Item::ITEM_NUM_COUNT || Item::items[itemId] == NULL)
 	{
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene_EnchantingMenu.cpp b/Minecraft.Client/Platform/Common/UI/UIScene_EnchantingMenu.cpp
index 15734fa95..6d55dfba8 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene_EnchantingMenu.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene_EnchantingMenu.cpp
@@ -250,7 +250,7 @@ void UIScene_EnchantingMenu::customDraw(IggyCustomDrawCallbackRegion *region)
 	if(pMinecraft->localplayers[m_iPad] == NULL || pMinecraft->localgameModes[m_iPad] == NULL) return;
 	
 
-	if(wcscmp((wchar_t *)region->name,L"EnchantmentBook")==0)
+	if(std::char_traits<char16_t>::compare(region->name, u"EnchantmentBook", 15) == 0)
 	{
 		// Setup GDraw, normal game render states and matrices
 		CustomDrawData *customDrawRegion = ui.setupCustomDraw(this,region);
@@ -263,8 +263,7 @@ void UIScene_EnchantingMenu::customDraw(IggyCustomDrawCallbackRegion *region)
 	}
 	else
 	{
-		int slotId = -1;
-		swscanf((wchar_t*)region->name,L"slot_Button%d",&slotId);
+		int slotId = parseSlotId(region->name);
 		if(slotId >= 0)
 		{
 			// Setup GDraw, normal game render states and matrices
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene_HUD.cpp b/Minecraft.Client/Platform/Common/UI/UIScene_HUD.cpp
index b1883b4ed..ff8f3b079 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene_HUD.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene_HUD.cpp
@@ -182,8 +182,7 @@ void UIScene_HUD::customDraw(IggyCustomDrawCallbackRegion *region)
 	Minecraft *pMinecraft = Minecraft::GetInstance();
 	if(pMinecraft->localplayers[m_iPad] == NULL || pMinecraft->localgameModes[m_iPad] == NULL) return;
 
-	int slot = -1;
-	swscanf((wchar_t*)region->name,L"slot_%d",&slot);
+	int slot = parseSlotId(region->name);
 	if (slot == -1)
 	{
 		app.DebugPrintf("This is not the control we are looking for\n");
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene_InventoryMenu.cpp b/Minecraft.Client/Platform/Common/UI/UIScene_InventoryMenu.cpp
index 7a94452fc..22378c97d 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene_InventoryMenu.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene_InventoryMenu.cpp
@@ -222,7 +222,7 @@ void UIScene_InventoryMenu::customDraw(IggyCustomDrawCallbackRegion *region)
 	Minecraft *pMinecraft = Minecraft::GetInstance();
 	if(pMinecraft->localplayers[m_iPad] == NULL || pMinecraft->localgameModes[m_iPad] == NULL) return;
 
-	if(wcscmp((wchar_t *)region->name,L"player")==0)
+	if(std::char_traits<char16_t>::compare(region->name, u"player", 6) == 0)
 	{
 		// Setup GDraw, normal game render states and matrices
 		CustomDrawData *customDrawRegion = ui.setupCustomDraw(this,region);
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene_LeaderboardsMenu.cpp b/Minecraft.Client/Platform/Common/UI/UIScene_LeaderboardsMenu.cpp
index 8bc4ab11b..77ec06275 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene_LeaderboardsMenu.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene_LeaderboardsMenu.cpp
@@ -961,11 +961,11 @@ int UIScene_LeaderboardsMenu::SetLeaderboardTitleIcons()
 
 void UIScene_LeaderboardsMenu::customDraw(IggyCustomDrawCallbackRegion *region)
 {
-	int slotId = -1;
-	swscanf((wchar_t*)region->name,L"slot_%d",&slotId);
+	int slotId = parseSlotId(region->name);
 	if (slotId == -1)
 	{
-		//app.DebugPrintf("This is not the control we are looking for\n");
+		//assert(0);
+app.DebugPrintf("This is not the control we are looking for\n");
 	}
 	else
 	{
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene_MainMenu.cpp b/Minecraft.Client/Platform/Common/UI/UIScene_MainMenu.cpp
index 207dc28a5..7c0575186 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene_MainMenu.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene_MainMenu.cpp
@@ -424,7 +424,7 @@ void UIScene_MainMenu::RunAction(int iPad)
 
 void UIScene_MainMenu::customDraw(IggyCustomDrawCallbackRegion *region)
 {
-	if(wcscmp((wchar_t *)region->name,L"Splash")==0)
+	if(std::char_traits<char16_t>::compare(region->name, u"Splash", 6) == 0)
 	{
 		PIXBeginNamedEvent(0,"Custom draw splash");
 		customDrawSplash(region);
diff --git a/Minecraft.Client/Platform/Common/UI/UIScene_TradingMenu.cpp b/Minecraft.Client/Platform/Common/UI/UIScene_TradingMenu.cpp
index 619a22bf3..c4ea9e469 100644
--- a/Minecraft.Client/Platform/Common/UI/UIScene_TradingMenu.cpp
+++ b/Minecraft.Client/Platform/Common/UI/UIScene_TradingMenu.cpp
@@ -148,8 +148,7 @@ void UIScene_TradingMenu::customDraw(IggyCustomDrawCallbackRegion *region)
 	if(pMinecraft->localplayers[m_iPad] == NULL || pMinecraft->localgameModes[m_iPad] == NULL) return;
 
 	std::shared_ptr<ItemInstance> item = nullptr;
-	int slotId = -1;
-	swscanf((wchar_t*)region->name,L"slot_%d",&slotId);
+	int slotId = parseSlotId(region->name);
 
 	if(slotId < MerchantMenu::USE_ROW_SLOT_END)
 	{