UIDevice+machine.swift

extension UIDevice {
    private static func sysctl(by name: String) -> String {
        return name.withCString {
            var size = 0
            sysctlbyname($0, nil, &size, nil, 0)
            var value = [CChar](repeating: 0, count: size)
            sysctlbyname($0, &value, &size, nil, 0)
            return String(cString: value)
        }
    }

    private struct HW {
        static let machine = sysctl(by: "hw.machine")
    }

    var machine: String {
        return HW.machine
    }
}