Add missing functions for the Nintendo Switch

library/std/src/os/switch/ffi/mod.rs

@@ -0,0 +1,45 @@
+//! Unix-specific extension to the primitives in the `std::ffi` module.
+//!
+//! # Examples
+//!
+//! ```
+//! use std::ffi::OsString;
+//! use std::os::unix::ffi::OsStringExt;
+//!
+//! let bytes = b"foo".to_vec();
+//!
+//! // OsStringExt::from_vec
+//! let os_string = OsString::from_vec(bytes);
+//! assert_eq!(os_string.to_str(), Some("foo"));
+//!
+//! // OsStringExt::into_vec
+//! let bytes = os_string.into_vec();
+//! assert_eq!(bytes, b"foo");
+//! ```
+//!
+//! ```
+//! use std::ffi::OsStr;
+//! use std::os::unix::ffi::OsStrExt;
+//!
+//! let bytes = b"foo";
+//!
+//! // OsStrExt::from_bytes
+//! let os_str = OsStr::from_bytes(bytes);
+//! assert_eq!(os_str.to_str(), Some("foo"));
+//!
+//! // OsStrExt::as_bytes
+//! let bytes = os_str.as_bytes();
+//! assert_eq!(bytes, b"foo");
+//! ```
+
+#![stable(feature = "rust1", since = "1.0.0")]
+mod os_str;
+
+#[stable(feature = "rust1", since = "1.0.0")]
+pub use self::os_str::{OsStrExt, OsStringExt};
+
+#[stable(feature = "rust1", since = "1.0.0")]
+mod ffi {
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub use crate::sys_common::os_str_bytes::*;
+}

library/std/src/os/switch/ffi/os_str.rs

@@ -0,0 +1,68 @@
+use crate::ffi::{OsStr, OsString};
+use crate::mem;
+use crate::sealed::Sealed;
+use crate::sys::os_str::Buf;
+use crate::sys_common::{AsInner, FromInner, IntoInner};
+
+// Note: this file is currently reused in other `std::os::{platform}::ffi` modules to reduce duplication.
+// Keep this in mind when applying changes to this file that only apply to `unix`.
+
+/// Platform-specific extensions to [`OsString`].
+///
+/// This trait is sealed: it cannot be implemented outside the standard library.
+/// This is so that future additional methods are not breaking changes.
+#[stable(feature = "rust1", since = "1.0.0")]
+pub trait OsStringExt: Sealed {
+    /// Creates an [`OsString`] from a byte vector.
+    ///
+    /// See the module documentation for an example.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    fn from_vec(vec: Vec<u8>) -> Self;
+
+    /// Yields the underlying byte vector of this [`OsString`].
+    ///
+    /// See the module documentation for an example.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    fn into_vec(self) -> Vec<u8>;
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl OsStringExt for OsString {
+    fn from_vec(vec: Vec<u8>) -> OsString {
+        FromInner::from_inner(Buf { inner: vec })
+    }
+    fn into_vec(self) -> Vec<u8> {
+        self.into_inner().inner
+    }
+}
+
+/// Platform-specific extensions to [`OsStr`].
+///
+/// This trait is sealed: it cannot be implemented outside the standard library.
+/// This is so that future additional methods are not breaking changes.
+#[stable(feature = "rust1", since = "1.0.0")]
+pub trait OsStrExt: Sealed {
+    #[stable(feature = "rust1", since = "1.0.0")]
+    /// Creates an [`OsStr`] from a byte slice.
+    ///
+    /// See the module documentation for an example.
+    fn from_bytes(slice: &[u8]) -> &Self;
+
+    /// Gets the underlying byte view of the [`OsStr`] slice.
+    ///
+    /// See the module documentation for an example.
+    #[stable(feature = "rust1", since = "1.0.0")]
+    fn as_bytes(&self) -> &[u8];
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl OsStrExt for OsStr {
+    #[inline]
+    fn from_bytes(slice: &[u8]) -> &OsStr {
+        unsafe { mem::transmute(slice) }
+    }
+    #[inline]
+    fn as_bytes(&self) -> &[u8] {
+        &self.as_inner().inner
+    }
+}

library/std/src/os/switch/mod.rs

@@ -0,0 +1,2 @@
+#![stable(feature = "rust1", since = "1.0.0")]
+pub mod ffi;

library/std/src/sys/switch/rwlock.rs

@@ -4,6 +4,8 @@ pub struct RWLock {
     mode: UnsafeCell<isize>,
 }
 
+pub type MovableRWLock = Box<RWLock>;
+
 unsafe impl Send for RWLock {}
 unsafe impl Sync for RWLock {} // no threads on wasm
 

library/std/src/sys/switch/thread.rs

@@ -5,6 +5,8 @@ use crate::mem;
 use crate::ptr;
 use crate::sys::os;
 use crate::time::Duration;
+use crate::num::NonZeroUsize;
+use crate::sys::unsupported;
 
 use nnsdk::{os::SleepThread, TimeSpan};
 
@@ -146,4 +148,8 @@ pub mod guard {
 
 fn min_stack_size(_: *const libc::pthread_attr_t) -> usize {
     0x1000 // just a guess
+}
+
+pub fn available_concurrency() -> io::Result<NonZeroUsize> {
+    unsupported()
 }