Remove unnecessary use of thread local storage

Common/SysError.cpp

@@ -0,0 +1,61 @@
+// Copyright (C) 2003 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0 or later versions.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+#include <cstring>
+#include <string>
+
+#include "util/text/utf8.h"
+#include "SysError.h"
+
+#ifdef _WIN32
+#include "CommonWindows.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() {
+#ifdef _WIN32
+	return GetStringErrorMsg(GetLastError());
+#else
+	return GetStringErrorMsg(errno);
+#endif
+}
+
+std::string GetStringErrorMsg(int errCode) {
+	static const size_t buff_size = 1023;
+
+#ifdef _WIN32
+	wchar_t err_strw[buff_size] = {};
+
+	FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errCode,
+		MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
+		err_strw, buff_size, NULL);
+
+	char err_str[buff_size] = {};
+	snprintf(err_str, buff_size, "%s", ConvertWStringToUTF8(err_strw).c_str());
+	return std::string(err_str);
+#else
+	char err_str[buff_size] = {};
+
+	// Thread safe (XSI-compliant)
+	if (strerror_r(errCode, err_str, buff_size) == 0) {
+		return "Unknown error";
+	}
+	return err_str;
+#endif
+}