Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

1 files changed, 34 insertions, 0 deletions

diff --git a/vendor/rustix/src/bitcast.rs b/vendor/rustix/src/bitcast.rs
new file mode 100644
index 0000000..77e0e63
--- /dev/null
+++ b/vendor/rustix/src/bitcast.rs
@@ -0,0 +1,34 @@
+//! The `bitcast` and `bitflags_bits` macros.
+
+#![allow(unused_macros)]
+
+// Ensure that the source and destination types are both primitive integer
+// types and the same size, and then bitcast.
+macro_rules! bitcast {
+    ($x:expr) => {{
+        if false {
+            // Ensure the source and destinations are primitive integer types.
+            let _ = !$x;
+            let _ = $x as u8;
+            0
+        } else if false {
+            // Ensure that the source and destinations are the same size.
+            // SAFETY: This code is under an `if false`.
+            #[allow(unsafe_code, unused_unsafe, clippy::useless_transmute)]
+            unsafe {
+                ::core::mem::transmute($x)
+            }
+        } else {
+            // Do the conversion.
+            $x as _
+        }
+    }};
+}
+
+/// Return a [`bitcast`] of the value of `$x.bits()`, where `$x` is a
+/// `bitflags` type.
+macro_rules! bitflags_bits {
+    ($x:expr) => {{
+        bitcast!($x.bits())
+    }};
+}