citra-nightly/src/common/misc.cpp

// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <cstddef>

#ifdef _WIN32
#include <windows.h>
#else
#include <cerrno>
#include <cstring>
#endif

// Neither Android nor OS X support TLS
#if  defined(__APPLE__) || (ANDROID && __clang__)
#define __thread
#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.
const char* GetLastErrorMsg()
{
    static const size_t buff_size = 255;

#ifdef _WIN32
    static __declspec(thread) char err_str[buff_size] = {};

    FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, nullptr, GetLastError(),
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        err_str, buff_size, nullptr);
#else
    static __thread char err_str[buff_size] = {};

    // Thread safe (XSI-compliant)
    strerror_r(errno, err_str, buff_size);
#endif

    return err_str;
}