Rename Misc.cpp to CommonFuncs.cpp

Because its only function is declared in CommonFuncs.h.

Source/Core/Common/CommonFuncs.cpp

@@ -0,0 +1,33 @@
+// Copyright 2009 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <cstddef>
+#include <cstring>
+#include <errno.h>
+
+#include "Common/CommonFuncs.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+// Generic function to get last error message.
+// Call directly after the command or use the error num.
+// This function might change the error code.
+std::string GetLastErrorMsg()
+{
+  const size_t buff_size = 256;
+  char err_str[buff_size];
+
+#ifdef _WIN32
+  FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, GetLastError(),
+                 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), err_str, buff_size, nullptr);
+#else
+  // Thread safe (XSI-compliant)
+  if (strerror_r(errno, err_str, buff_size))
+    return "";
+#endif
+
+  return std::string(err_str);
+}