vendor/rustix-0.36.5/src/utils.rs

   1 /// Convert a `&T` into a `*const T` without using an `as`.
   2 #[inline]
   3 #[allow(dead_code)]
   4 pub(crate) const fn as_ptr<T>(t: &T) -> *const T {
   5     t
   6 }
   7
   8 /// Convert a `&mut T` into a `*mut T` without using an `as`.
   9 #[inline]
  10 #[allow(dead_code)]
  11 pub(crate) fn as_mut_ptr<T>(t: &mut T) -> *mut T {
  12     t
  13 }
  14
  15 /// Convert a `*mut c_void` to a `*mut T`, checking that it is not null,
  16 /// misaligned, or pointing to a region of memory that wraps around the address
  17 /// space.
  18 #[allow(dead_code)]
  19 pub(crate) fn check_raw_pointer<T>(value: *mut core::ffi::c_void) -> Option<core::ptr::NonNull<T>> {
  20     if (value as usize)
  21         .checked_add(core::mem::size_of::<T>())
  22         .is_none()
  23         || (value as usize) % core::mem::align_of::<T>() != 0
  24     {
  25         return None;
  26     }
  27
  28     core::ptr::NonNull::new(value.cast())
  29 }