internal static unsafe Version GetOSVersion()

in JetBrains.HabitatDetector/src/Impl/MacOsX/MacOsHelper.cs [51:86]

• 32 lines of code
• 5 McCabe index (conditional complexity)

    internal static unsafe Version GetOSVersion(JetArchitecture processArchitecture)
    {
      var processInfo = LibObjC.objc_msgSend(LibObjC.objc_getClass("NSProcessInfo"), LibObjC.sel_getUid("processInfo"));
      var operationSystemVersionUid = LibObjC.sel_getUid("operatingSystemVersion");
      LibObjC.NSOperatingSystemVersion res;
      switch (processArchitecture)
      {
      case JetArchitecture.Arm64:
        res = LibObjC.NSOperatingSystemVersion_objc_msgSend(processInfo, operationSystemVersionUid);
        break;
      case JetArchitecture.X64:
        LibObjC.NSOperatingSystemVersion_objc_msgSend_stret(out res, processInfo, operationSystemVersionUid);
        break;
      default:
        throw new ArgumentOutOfRangeException(nameof(processArchitecture), processArchitecture, null);
      }

      int major;
      int minor;
      int patch;
      checked
      {
        major = (int)res.majorVersion;
        minor = (int)res.minorVersion;
        patch = (int)res.patchVersion;
      }

      // Note(ww898): Compatibility with older software! See also SYSTEM_VERSION_COMPAT=1. Big Sur and newer OSes always returns 10.16!!!
      if (major == 10 && minor == 16)
      {
        major = 11;
        minor = 0;
      }

      return new Version(major, minor, patch);
    }