/// The datatype used for the ioctl number
#[cfg(any(target_os = "android", target_env = "musl"))]
#[doc(hidden)]
pub type ioctl_num_type = ::libc::c_int;
#[cfg(not(any(target_os = "android", target_env = "musl")))]
#[doc(hidden)]
pub type ioctl_num_type = ::libc::c_ulong;
/// The datatype used for the 3rd argument
#[doc(hidden)]
pub type ioctl_param_type = ::libc::c_ulong;

#[doc(hidden)]
pub const NRBITS: ioctl_num_type = 8;
#[doc(hidden)]
pub const TYPEBITS: ioctl_num_type = 8;

#[cfg(any(target_arch = "mips", target_arch = "mips64", target_arch = "powerpc", target_arch = "powerpc64", target_arch = "sparc64"))]
mod consts {
    #[doc(hidden)]
    pub const NONE: u8 = 1;
    #[doc(hidden)]
    pub const READ: u8 = 2;
    #[doc(hidden)]
    pub const WRITE: u8 = 4;
    #[doc(hidden)]
    pub const SIZEBITS: u8 = 13;
    #[doc(hidden)]
    pub const DIRBITS: u8 = 3;
}

// "Generic" ioctl protocol
#[cfg(any(target_arch = "x86",
          target_arch = "arm",
          target_arch = "s390x",
          target_arch = "x86_64",
          target_arch = "aarch64"))]
mod consts {
    #[doc(hidden)]
    pub const NONE: u8 = 0;
    #[doc(hidden)]
    pub const READ: u8 = 2;
    #[doc(hidden)]
    pub const WRITE: u8 = 1;
    #[doc(hidden)]
    pub const SIZEBITS: u8 = 14;
    #[doc(hidden)]
    pub const DIRBITS: u8 = 2;
}

pub use self::consts::*;

#[doc(hidden)]
pub const NRSHIFT: ioctl_num_type = 0;
#[doc(hidden)]
pub const TYPESHIFT: ioctl_num_type = NRSHIFT + NRBITS as ioctl_num_type;
#[doc(hidden)]
pub const SIZESHIFT: ioctl_num_type = TYPESHIFT + TYPEBITS as ioctl_num_type;
#[doc(hidden)]
pub const DIRSHIFT: ioctl_num_type = SIZESHIFT + SIZEBITS as ioctl_num_type;

#[doc(hidden)]
pub const NRMASK: ioctl_num_type = (1 << NRBITS) - 1;
#[doc(hidden)]
pub const TYPEMASK: ioctl_num_type = (1 << TYPEBITS) - 1;
#[doc(hidden)]
pub const SIZEMASK: ioctl_num_type = (1 << SIZEBITS) - 1;
#[doc(hidden)]
pub const DIRMASK: ioctl_num_type = (1 << DIRBITS) - 1;

/// Encode an ioctl command.
#[macro_export]
#[doc(hidden)]
macro_rules! ioc {
    ($dir:expr, $ty:expr, $nr:expr, $sz:expr) => (
        (($dir as $crate::sys::ioctl::ioctl_num_type & $crate::sys::ioctl::DIRMASK) << $crate::sys::ioctl::DIRSHIFT) |
        (($ty as $crate::sys::ioctl::ioctl_num_type & $crate::sys::ioctl::TYPEMASK) << $crate::sys::ioctl::TYPESHIFT) |
        (($nr as $crate::sys::ioctl::ioctl_num_type & $crate::sys::ioctl::NRMASK) << $crate::sys::ioctl::NRSHIFT) |
        (($sz as $crate::sys::ioctl::ioctl_num_type & $crate::sys::ioctl::SIZEMASK) << $crate::sys::ioctl::SIZESHIFT))
}

/// Generate an ioctl request code for a command that passes no data.
///
/// This is equivalent to the `_IO()` macro exposed by the C ioctl API.
///
/// You should only use this macro directly if the `ioctl` you're working
/// with is "bad" and you cannot use `ioctl_none!()` directly.
///
/// # Example
///
/// ```
/// # #[macro_use] extern crate nix;
/// const KVMIO: u8 = 0xAE;
/// ioctl_write_int_bad!(kvm_create_vm, request_code_none!(KVMIO, 0x03));
/// # fn main() {}
/// ```
#[macro_export]
macro_rules! request_code_none {
    ($ty:expr, $nr:expr) => (ioc!($crate::sys::ioctl::NONE, $ty, $nr, 0))
}

/// Generate an ioctl request code for a command that reads.
///
/// This is equivalent to the `_IOR()` macro exposed by the C ioctl API.
///
/// You should only use this macro directly if the `ioctl` you're working
/// with is "bad" and you cannot use `ioctl_read!()` directly.
///
/// The read/write direction is relative to userland, so this
/// command would be userland is reading and the kernel is
/// writing.
#[macro_export]
macro_rules! request_code_read {
    ($ty:expr, $nr:expr, $sz:expr) => (ioc!($crate::sys::ioctl::READ, $ty, $nr, $sz))
}

/// Generate an ioctl request code for a command that writes.
///
/// This is equivalent to the `_IOW()` macro exposed by the C ioctl API.
///
/// You should only use this macro directly if the `ioctl` you're working
/// with is "bad" and you cannot use `ioctl_write!()` directly.
///
/// The read/write direction is relative to userland, so this
/// command would be userland is writing and the kernel is
/// reading.
#[macro_export]
macro_rules! request_code_write {
    ($ty:expr, $nr:expr, $sz:expr) => (ioc!($crate::sys::ioctl::WRITE, $ty, $nr, $sz))
}

/// Generate an ioctl request code for a command that reads and writes.
///
/// This is equivalent to the `_IOWR()` macro exposed by the C ioctl API.
///
/// You should only use this macro directly if the `ioctl` you're working
/// with is "bad" and you cannot use `ioctl_readwrite!()` directly.
#[macro_export]
macro_rules! request_code_readwrite {
    ($ty:expr, $nr:expr, $sz:expr) => (ioc!($crate::sys::ioctl::READ | $crate::sys::ioctl::WRITE, $ty, $nr, $sz))
}
