Merging upstream version 1.73.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/vendor/rustix-0.37.22/src/utils.rs b/vendor/rustix-0.37.22/src/utils.rs
new file mode 100644
index 000000000..df2ac315b
--- /dev/null
+++ b/vendor/rustix-0.37.22/src/utils.rs
@@ -0,0 +1,48 @@
+#![allow(dead_code)]
+
+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 optional_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 optional_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())
+}