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3b83f5d5e7
`kernel::ffi::CStr` was introduced in commitd126d23801("rust: str: add `CStr` type") in November 2022 as an upstreaming of earlier work that was done in May 2021[0]. That earlier work, having predated the inclusion of `CStr` in `core`, largely duplicated the implementation of `std::ffi::CStr`. `std::ffi::CStr` was moved to `core::ffi::CStr` in Rust 1.64 in September 2022. Hence replace `kernel::str::CStr` with `core::ffi::CStr` to reduce our custom code footprint, and retain needed custom functionality through an extension trait. Add `CStr` to `ffi` and the kernel prelude. Link:faa3cbcca0[0] Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Acked-by: Danilo Krummrich <dakr@kernel.org> Reviewed-by: Benno Lossin <lossin@kernel.org> Signed-off-by: Tamir Duberstein <tamird@gmail.com> Link: https://patch.msgid.link/20251018-cstr-core-v18-16-9378a54385f8@gmail.com [ Removed assert that would now depend on the Rust version. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
51 lines
1.3 KiB
Rust
51 lines
1.3 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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//! Foreign function interface (FFI) types.
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//!
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//! This crate provides mapping from C primitive types to Rust ones.
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//!
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//! The Rust [`core`] crate provides [`core::ffi`], which maps integer types to the platform default
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//! C ABI. The kernel does not use [`core::ffi`], so it can customise the mapping that deviates from
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//! the platform default.
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#![no_std]
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macro_rules! alias {
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($($name:ident = $ty:ty;)*) => {$(
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#[allow(non_camel_case_types, missing_docs)]
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pub type $name = $ty;
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// Check size compatibility with `core`.
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const _: () = assert!(
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::core::mem::size_of::<$name>() == ::core::mem::size_of::<::core::ffi::$name>()
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);
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)*}
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}
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alias! {
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// `core::ffi::c_char` is either `i8` or `u8` depending on architecture. In the kernel, we use
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// `-funsigned-char` so it's always mapped to `u8`.
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c_char = u8;
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c_schar = i8;
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c_uchar = u8;
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c_short = i16;
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c_ushort = u16;
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c_int = i32;
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c_uint = u32;
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// In the kernel, `intptr_t` is defined to be `long` in all platforms, so we can map the type to
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// `isize`.
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c_long = isize;
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c_ulong = usize;
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c_longlong = i64;
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c_ulonglong = u64;
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}
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pub use core::ffi::c_void;
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pub use core::ffi::CStr;
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