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Diffstat (limited to 'vendor/rustix/src/utils.rs')
-rw-r--r-- | vendor/rustix/src/utils.rs | 82 |
1 files changed, 0 insertions, 82 deletions
diff --git a/vendor/rustix/src/utils.rs b/vendor/rustix/src/utils.rs deleted file mode 100644 index d21ed88..0000000 --- a/vendor/rustix/src/utils.rs +++ /dev/null @@ -1,82 +0,0 @@ -//! Miscellaneous minor utilities. - -#![allow(dead_code)] -#![allow(unused_macros)] - -use core::ffi::c_void; -use core::mem::{align_of, size_of}; -use core::ptr::{null, null_mut, NonNull}; - -/// Convert a `&T` into a `*const T` without using an `as`. -#[inline] -pub(crate) const fn as_ptr<T>(t: &T) -> *const T { - t -} - -/// Convert a `&mut T` into a `*mut T` without using an `as`. -#[inline] -pub(crate) fn as_mut_ptr<T>(t: &mut T) -> *mut T { - t -} - -/// Convert an `Option<&T>` into a possibly-null `*const T`. -#[inline] -pub(crate) const fn option_as_ptr<T>(t: Option<&T>) -> *const T { - match t { - Some(t) => t, - None => null(), - } -} - -/// Convert an `Option<&mut T>` into a possibly-null `*mut T`. -#[inline] -pub(crate) fn option_as_mut_ptr<T>(t: Option<&mut T>) -> *mut T { - match t { - Some(t) => t, - None => null_mut(), - } -} - -/// Convert a `*mut c_void` to a `*mut T`, checking that it is not null, -/// misaligned, or pointing to a region of memory that wraps around the address -/// space. -pub(crate) fn check_raw_pointer<T>(value: *mut c_void) -> Option<NonNull<T>> { - if (value as usize).checked_add(size_of::<T>()).is_none() - || (value as usize) % align_of::<T>() != 0 - { - return None; - } - - NonNull::new(value.cast()) -} - -/// Create an array value containing all default values, inferring the type. -#[inline] -pub(crate) fn default_array<T: Default + Copy, const N: usize>() -> [T; N] { - [T::default(); N] -} - -/// Create a union value containing a default value in one of its arms. -/// -/// The field names a union field which must have the same size as the union -/// itself. -macro_rules! default_union { - ($union:ident, $field:ident) => {{ - let u = $union { - $field: Default::default(), - }; - - // Assert that the given field initializes the whole union. - #[cfg(test)] - unsafe { - let field_value = u.$field; - assert_eq!( - core::mem::size_of_val(&u), - core::mem::size_of_val(&field_value) - ); - const_assert_eq!(memoffset::offset_of_union!($union, $field), 0); - } - - u - }}; -} |