Systems Programming in Rust

A collection of my systems programming learning projects, built in Rust as one Cargo workspace. Each project lives in its own folder with its own README.

git clone https://github.com/obah/systems_programming_rs.git
cd systems_programming_rs
cargo run -p <package> -- <args>

Projects

CLI tools

Project	Status	Description
todo	✅ Done	A task manager for the terminal — add, list, rename, complete and delete tasks, persisted to a plain text file.
calc_mini_interpreter	🚧 WIP	An arithmetic REPL — a lexer → parser → evaluator pipeline in miniature. Variables exist in the evaluator but aren't reachable from input yet.
diff	🚧 WIP	Compares two files line by line. Reports whether they differ; per-line output and an LCS algorithm are still to come.

Serialization & binary formats

Project	Status	Description
bit_manipulation	✅ Done	Packing a record header (4-bit tag, 1-bit flag, 11-bit length) into a single u16 and reading it back out.
type_layout	✅ Done	How Rust lays a struct out in memory — the same two fields under repr(Rust), repr(C), repr(packed) and repr(packed(2)). Fails to build on purpose (E0793).
bytes	✅ Done	Round-tripping a (u32, i64, f64) through a byte buffer in both endiannesses with Cursor and byteorder. Ends in a deliberate NaN != NaN panic.
serde_serialization	✅ Done	Serde's data model — a derived Point, and a hand-written Deserialize with its own Visitor for a Message enum.
tcp_codec	✅ Done	Length-prefixed framing over TCP with Tokio — a 4-byte big-endian prefix turned into a Stream/Sink via Framed, plus Tokio-tutorial working notes.
resp2_parser	🚧 WIP	A parser, encoder and TCP server for RESP2, the protocol Redis speaks — real redis-cli talks to it. Replies are still stubbed +OK.

Concurrency

Project	Status	Description
rust_practice	🚧 WIP	Lessons on threads, channels, shared state and atomics, with exercises alongside. cargo run hangs on the atomics lesson — a todo!() worker, which is its own lesson.

Development

cargo test -p <package>   # test one project
cargo test                # test everything
cargo clippy
cargo fmt