no-std-io2 is a fork of no-std-io, which is a fork of core2.

Ever wanted a Cursor or the Error trait in no_std? Well now you can have it. A 'fork' of Rust's std modules for no_std environments, with the added benefit of optionally taking advantage of alloc.

The goal of this crate is to provide a stable interface for building I/O and error trait functionality in no_std environments. The current code corresponds to the most recent stable API of Rust 1.56.0. It is also a goal to achieve a true alloc-less experience, with opt-in alloc support.

This crate works on stable with some limitations in functionality, and nightly without limitations by adding the relevant feature flag.

[dependencies]
no_std_io2 = "0.9"

Add the crate, use the things you would usually want from std::io, but instead from no_std_io2::io, and use no_std_io2::error::Error in place of std::error::Error.

• std: enables std pass-throughs for the polyfilled types, but allows accessing the new types
• alloc: enable aspects of the Read and Write traits that require alloc support (WIP)
• nightly: enables nightly-only features.

• No std::io::Error, so we have our own copy without any Os error functions
• IoSlice and the *_vectored family of functions are not implemented.
• BufReader and BufWriter have a different signature, as they now use a const generic bounded array for the internal buffer.

Other than items perhaps being entirely missing or certain functions unavailable on some traits, no function signatures have been changed.

• Error trait is not implemented for ! because never_type feature is not yet stabilized.

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Almost all of the code in this repository is a copy of the Rust language codebase with minor modifications.

For attributions, see https://thanks.rust-lang.org/.