IOS/USB_KBD: Use std::array for member variables where applicable

Simplifies initialization code quite a bit, and replaces a pointer
variable for SMessageData with a type properly representing the whole
set of data it needs.

Source/Core/Core/IOS/USB/USB_KBD.cpp

@@ -5,7 +5,6 @@
 #include "Core/IOS/USB/USB_KBD.h"
 
 #include <array>
-#include <cstring>
 #include <queue>
 
 #include "Common/FileUtil.h"
@@ -177,17 +176,9 @@ constexpr std::array<u8, 256> s_key_codes_azerty{};
 #endif
 }  // Anonymous namespace
 
-USB_KBD::SMessageData::SMessageData(u32 type, u8 modifiers, u8* pressed_keys)
+USB_KBD::SMessageData::SMessageData(u32 type, u8 modifiers, PressedKeyData pressed_keys)
+    : MsgType{Common::swap32(type)}, Modifiers{modifiers}, PressedKeys{pressed_keys}
 {
-  MsgType = Common::swap32(type);
-  Unk1 = 0;  // swapped
-  Modifiers = modifiers;
-  Unk2 = 0;
-
-  if (pressed_keys)  // Doesn't need to be in a specific order
-    memcpy(PressedKeys, pressed_keys, sizeof(PressedKeys));
-  else
-    memset(PressedKeys, 0, sizeof(PressedKeys));
 }
 
 // TODO: support in netplay/movies.
@@ -203,15 +194,11 @@ IPCCommandResult USB_KBD::Open(const OpenRequest& request)
   ini.Load(File::GetUserPath(F_DOLPHINCONFIG_IDX));
   ini.GetOrCreateSection("USB Keyboard")->Get("Layout", &m_KeyboardLayout, KBD_LAYOUT_QWERTY);
 
-  m_MessageQueue = std::queue<SMessageData>();
-  for (bool& pressed : m_OldKeyBuffer)
-  {
-    pressed = false;
-  }
-
+  m_MessageQueue = {};
+  m_OldKeyBuffer.fill(false);
   m_OldModifiers = 0x00;
 
-  // m_MessageQueue.push(SMessageData(MSG_KBD_CONNECT, 0, nullptr));
+  // m_MessageQueue.emplace(MSG_KBD_CONNECT, 0, PressedKeyData{});
   return Device::Open(request);
 }
 
@@ -251,12 +238,12 @@ void USB_KBD::Update()
     return;
 
   u8 Modifiers = 0x00;
-  u8 PressedKeys[6] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+  PressedKeyData PressedKeys{0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
   bool GotEvent = false;
-  int num_pressed_keys = 0;
-  for (int i = 0; i < 256; i++)
+  size_t num_pressed_keys = 0;
+  for (size_t i = 0; i < m_OldKeyBuffer.size(); i++)
   {
-    bool KeyPressedNow = IsKeyPressed(i);
+    bool KeyPressedNow = IsKeyPressed(static_cast<int>(i));
     bool KeyPressedBefore = m_OldKeyBuffer[i];
     u8 KeyCode = 0;
 
@@ -281,7 +268,7 @@ void USB_KBD::Update()
         PressedKeys[num_pressed_keys] = KeyCode;
 
         num_pressed_keys++;
-        if (num_pressed_keys == 6)
+        if (num_pressed_keys == PressedKeys.size())
           break;
       }
 
@@ -320,6 +307,6 @@ void USB_KBD::Update()
   }
 
   if (GotEvent)
-    m_MessageQueue.push(SMessageData(MSG_EVENT, Modifiers, PressedKeys));
+    m_MessageQueue.emplace(MSG_EVENT, Modifiers, PressedKeys);
 }
 }  // namespace IOS::HLE::Device

Source/Core/Core/IOS/USB/USB_KBD.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <array>
 #include <queue>
 #include <string>
 
@@ -31,22 +32,24 @@ private:
     MSG_EVENT = 2
   };
 
+  using PressedKeyData = std::array<u8, 6>;
+
 #pragma pack(push, 1)
   struct SMessageData
   {
-    u32 MsgType;
-    u32 Unk1;
-    u8 Modifiers;
-    u8 Unk2;
-    u8 PressedKeys[6];
+    u32 MsgType = 0;
+    u32 Unk1 = 0;
+    u8 Modifiers = 0;
+    u8 Unk2 = 0;
+    PressedKeyData PressedKeys{};
 
-    SMessageData(u32 msg_type, u8 modifiers, u8* pressed_keys);
+    SMessageData(u32 msg_type, u8 modifiers, PressedKeyData pressed_keys);
   };
 #pragma pack(pop)
   std::queue<SMessageData> m_MessageQueue;
 
-  bool m_OldKeyBuffer[256];
-  u8 m_OldModifiers;
+  std::array<bool, 256> m_OldKeyBuffer{};
+  u8 m_OldModifiers = 0;
 
   virtual bool IsKeyPressed(int _Key);
 
@@ -56,6 +59,6 @@ private:
     KBD_LAYOUT_QWERTY = 0,
     KBD_LAYOUT_AZERTY = 1
   };
-  int m_KeyboardLayout;
+  int m_KeyboardLayout = KBD_LAYOUT_QWERTY;
 };
 }  // namespace IOS::HLE::Device