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|
/// The `libc_bitflags!` macro helps with a common use case of defining bitflags with values from
/// the libc crate. It is used the same way as the `bitflags!` macro, except that only the name of
/// the flag value has to be given.
///
/// The `libc` crate must be in scope with the name `libc`.
///
/// # Example
/// ```
/// libc_bitflags!{
/// pub flags ProtFlags: libc::c_int {
/// PROT_NONE,
/// PROT_READ,
/// PROT_WRITE,
/// PROT_EXEC,
/// #[cfg(any(target_os = "linux", target_os = "android"))]
/// PROT_GROWSDOWN,
/// #[cfg(any(target_os = "linux", target_os = "android"))]
/// PROT_GROWSUP,
/// }
/// }
/// ```
macro_rules! libc_bitflags {
// (non-pub) Exit rule.
(@call_bitflags
{
name: $BitFlags:ident,
type: $T:ty,
attrs: [$($attrs:tt)*],
flags: [$($flags:tt)*],
}
) => {
bitflags! {
$($attrs)*
flags $BitFlags: $T {
$($flags)*
}
}
};
// (pub) Exit rule.
(@call_bitflags
{
pub,
name: $BitFlags:ident,
type: $T:ty,
attrs: [$($attrs:tt)*],
flags: [$($flags:tt)*],
}
) => {
bitflags! {
$($attrs)*
pub flags $BitFlags: $T {
$($flags)*
}
}
};
// (non-pub) Done accumulating.
(@accumulate_flags
{
name: $BitFlags:ident,
type: $T:ty,
attrs: $attrs:tt,
},
$flags:tt;
) => {
libc_bitflags! {
@call_bitflags
{
name: $BitFlags,
type: $T,
attrs: $attrs,
flags: $flags,
}
}
};
// (pub) Done accumulating.
(@accumulate_flags
{
pub,
name: $BitFlags:ident,
type: $T:ty,
attrs: $attrs:tt,
},
$flags:tt;
) => {
libc_bitflags! {
@call_bitflags
{
pub,
name: $BitFlags,
type: $T,
attrs: $attrs,
flags: $flags,
}
}
};
// Munch an attr.
(@accumulate_flags
$prefix:tt,
[$($flags:tt)*];
#[$attr:meta] $($tail:tt)*
) => {
libc_bitflags! {
@accumulate_flags
$prefix,
[
$($flags)*
#[$attr]
];
$($tail)*
}
};
// Munch last ident if not followed by a comma.
(@accumulate_flags
$prefix:tt,
[$($flags:tt)*];
$flag:ident
) => {
libc_bitflags! {
@accumulate_flags
$prefix,
[
$($flags)*
const $flag = libc::$flag,
];
}
};
// Munch an ident; covers terminating comma case.
(@accumulate_flags
$prefix:tt,
[$($flags:tt)*];
$flag:ident, $($tail:tt)*
) => {
libc_bitflags! {
@accumulate_flags
$prefix,
[
$($flags)*
const $flag = libc::$flag,
];
$($tail)*
}
};
// (non-pub) Entry rule.
(
$(#[$attr:meta])*
flags $BitFlags:ident: $T:ty {
$($vals:tt)*
}
) => {
libc_bitflags! {
@accumulate_flags
{
name: $BitFlags,
type: $T,
attrs: [$(#[$attr])*],
},
[];
$($vals)*
}
};
// (pub) Entry rule.
(
$(#[$attr:meta])*
pub flags $BitFlags:ident: $T:ty {
$($vals:tt)*
}
) => {
libc_bitflags! {
@accumulate_flags
{
pub,
name: $BitFlags,
type: $T,
attrs: [$(#[$attr])*],
},
[];
$($vals)*
}
};
}
/// A Rust version of the familiar C `offset_of` macro. It returns the byte
/// offset of `field` within struct `ty`
macro_rules! offset_of {
($ty:ty, $field:ident) => {
&(*(0 as *const $ty)).$field as *const _ as usize
}
}
|
