diff options
Diffstat (limited to 'vendor/rustix/src/utils.rs')
-rw-r--r-- | vendor/rustix/src/utils.rs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/vendor/rustix/src/utils.rs b/vendor/rustix/src/utils.rs index efbbe81aa..dcbadb260 100644 --- a/vendor/rustix/src/utils.rs +++ b/vendor/rustix/src/utils.rs @@ -11,3 +11,19 @@ pub(crate) const fn as_ptr<T>(t: &T) -> *const T { pub(crate) fn as_mut_ptr<T>(t: &mut T) -> *mut T { t } + +/// 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. +#[allow(dead_code)] +pub(crate) fn check_raw_pointer<T>(value: *mut core::ffi::c_void) -> Option<core::ptr::NonNull<T>> { + if (value as usize) + .checked_add(core::mem::size_of::<T>()) + .is_none() + || (value as usize) % core::mem::align_of::<T>() != 0 + { + return None; + } + + core::ptr::NonNull::new(value.cast()) +} |