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use libc::{c_char, c_int};
extern "C" {
fn get_os_release(outbuf: *const c_char, outlen: usize) -> c_int;
fn get_build_number() -> c_int;
}
/// Get the version of the currently running kernel.
///
/// **Note**: On Windows 8 and later this will report the Windows 8 OS version value `6.2`,
/// unless the final application is build to explicitly target Windows 10.
/// See [`GetVersionEx`] for details.
///
/// [`GetVersionEx`]: https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getversionexa
///
///
/// Returns `None` if an error occured.
pub fn kernel_version() -> Option<String> {
unsafe {
// Windows 10 should report "10.0", which is 4 bytes,
// "unknown" is 7 bytes.
// We need to account for the null byte.
let size = 8;
let mut buf = vec![0; size];
let written = get_os_release(buf.as_mut_ptr() as _, size) as usize;
match written {
0 => None,
_ => Some(String::from_utf8_lossy(&buf[0..written]).into_owned()),
}
}
}
/// Get the build number from Windows.
///
/// **Note**: On Windows 8 and later this may report a Windows 8 build number,
/// for example 9200, unless the final application is build to explicitly
/// target Windows 10.
/// See [`GetVersionEx`] for details.
///
/// [`GetVersionEx`]: https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getversionexa
///
///
/// Returns `None` if an error occured.
pub fn windows_build_number() -> Option<i32> {
unsafe {
// Get windows build number
let build_number = get_build_number();
match build_number {
0 => None,
_ => Some(build_number),
}
}
}