Adding upstream version 124.0.1.upstream/124.0.1

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

1 files changed, 21 insertions, 0 deletions

diff --git a/third_party/rust/rustix/src/buffer.rs b/third_party/rust/rustix/src/buffer.rs
new file mode 100644
index 0000000000..e4b40c7391
--- /dev/null
+++ b/third_party/rust/rustix/src/buffer.rs
@@ -0,0 +1,21 @@
+//! Utilities to help with buffering.
+
+#![allow(unsafe_code)]
+
+use core::mem::MaybeUninit;
+use core::slice;
+
+/// Split an uninitialized byte slice into initialized and uninitialized parts.
+///
+/// # Safety
+///
+/// At least `init` bytes must be initialized.
+#[inline]
+pub(super) unsafe fn split_init(
+    buf: &mut [MaybeUninit<u8>],
+    init: usize,
+) -> (&mut [u8], &mut [MaybeUninit<u8>]) {
+    let (init, uninit) = buf.split_at_mut(init);
+    let init = slice::from_raw_parts_mut(init.as_mut_ptr() as *mut u8, init.len());
+    (init, uninit)
+}