codepage.cpp

#ifdef _WIN32
#include <windows.h>
#ifdef _MSC_VER
#pragma comment(lib, "ntdll.lib")
#endif

extern "C" __declspec(dllimport) long WINAPI RtlGetVersion (PRTL_OSVERSIONINFOEXW);

static bool check_windows_build_number(unsigned major, unsigned minor, unsigned build)
{
    if (RTL_OSVERSIONINFOEXW rovi = {.dwOSVersionInfoSize = sizeof(rovi)}; !RtlGetVersion(&rovi))
        return rovi.dwMajorVersion > major ||
               rovi.dwMajorVersion == major && rovi.dwMinorVersion > minor ||
               rovi.dwMajorVersion == major && rovi.dwMinorVersion == minor && rovi.dwBuildNumber >= build;
    else
        return false;
}
#endif