From 1b6a04ca5504955c571d1c97504fb45ea0befee4 Mon Sep 17 00:00:00 2001
From: Valentin Popov <valentin@popov.link>
Date: Mon, 8 Jan 2024 01:21:28 +0400
Subject: Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>
---
 vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs | 107 ++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs

(limited to 'vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs')

diff --git a/vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs b/vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs
new file mode 100644
index 0000000..f0ad750
--- /dev/null
+++ b/vendor/rustix/src/maybe_polyfill/no_std/io/mod.rs
@@ -0,0 +1,107 @@
+//! The following is derived from Rust's
+//! library/std/src/sys/unix/io.rs
+//! dca3f1b786efd27be3b325ed1e01e247aa589c3b.
+//!
+//! All code in this file is licensed MIT or Apache 2.0 at your option.
+
+#![allow(unsafe_code)]
+use crate::backend::c;
+#[cfg(not(linux_raw))]
+use c::size_t as __kernel_size_t;
+use core::marker::PhantomData;
+use core::slice;
+#[cfg(linux_raw)]
+use linux_raw_sys::general::__kernel_size_t;
+
+/// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html>
+#[derive(Copy, Clone)]
+#[repr(transparent)]
+pub struct IoSlice<'a> {
+    vec: c::iovec,
+    _p: PhantomData<&'a [u8]>,
+}
+
+impl<'a> IoSlice<'a> {
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.new>
+    #[inline]
+    pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
+        IoSlice {
+            vec: c::iovec {
+                iov_base: buf.as_ptr() as *mut u8 as *mut c::c_void,
+                iov_len: buf.len() as _,
+            },
+            _p: PhantomData,
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance>
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n as _ {
+            panic!("advancing IoSlice beyond its length");
+        }
+
+        unsafe {
+            // `__kernel_size_t` will always have the same size as `usize`, but it is a `u32` on
+            // 32-bit platforms and `u64` on 64-bit platforms when using `linux_raw` backend
+            self.vec.iov_len -= n as __kernel_size_t;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.as_slice>
+    #[inline]
+    pub fn as_slice(&self) -> &[u8] {
+        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len as usize) }
+    }
+}
+
+/// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html>
+#[repr(transparent)]
+pub struct IoSliceMut<'a> {
+    vec: c::iovec,
+    _p: PhantomData<&'a mut [u8]>,
+}
+
+impl<'a> IoSliceMut<'a> {
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.new>
+    #[inline]
+    pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
+        IoSliceMut {
+            vec: c::iovec {
+                iov_base: buf.as_mut_ptr() as *mut c::c_void,
+                iov_len: buf.len() as _,
+            },
+            _p: PhantomData,
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance>
+    #[inline]
+    pub fn advance(&mut self, n: usize) {
+        if self.vec.iov_len < n as _ {
+            panic!("advancing IoSliceMut beyond its length");
+        }
+
+        unsafe {
+            // `__kernel_size_t` will always have the same size as `usize`, but it is a `u32` on
+            // 32-bit platforms and `u64` on 64-bit platforms when using `linux_raw` backend
+            self.vec.iov_len -= n as __kernel_size_t;
+            self.vec.iov_base = self.vec.iov_base.add(n);
+        }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.as_slice>
+    #[inline]
+    pub fn as_slice(&self) -> &[u8] {
+        unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len as usize) }
+    }
+
+    /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.as_slice_mut>
+    #[inline]
+    pub fn as_mut_slice(&mut self) -> &mut [u8] {
+        unsafe {
+            slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len as usize)
+        }
+    }
+}
-- 
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