// yet another kernel's container_of macro for Rust

#[macro_export]
macro_rules! container_of {
    ($ptr:expr, $type:ty, $field:ident) => {
        ($ptr as *const _ as *const u8).sub(core::mem::offset_of!($type, $field) as usize) as *const $type
    };
}

#[macro_export]
macro_rules! container_of_offset {
    ($ptr:expr, $type:ty, $offset:expr) => {
        ($ptr as *const _ as *const u8).sub($offset) as *const $type
    };
}

#[macro_export]
macro_rules! to_field_offset {
    ($ptr:expr, $type:ty, $offset:expr) => {
        ($ptr as *const _ as *const u8).add($offset) as *const $type
    };
}