Скачать или смотреть A demo of a memory safe c called fil c

Download 1M+ code from https://codegive.com/7ce80aa
okay, let's dive into creating a memory-safe "file c" library with a demo, leveraging rust for memory management and c for core logic (and a bridge between them). this approach provides a path to safer file handling without completely abandoning existing c codebases.

*why this approach?*

*leverage rust's memory safety:* rust's ownership, borrowing, and lifetime systems guarantee memory safety at compile time, preventing common c errors like buffer overflows, use-after-free, and dangling pointers.
*incremental adoption:* this allows you to gradually introduce memory safety into existing c projects without rewriting everything at once.
*c interoperability:* rust provides excellent facilities for calling c code (ffi - foreign function interface) and vice-versa.
*potential performance:* c can be used where performance is absolutely critical. rust can handle the more complex memory management and error handling tasks.

*overview of the demo*

we'll create a simplified "file c" library with the following features:

1. *opening/closing files:* safe handling of file descriptors.
2. *reading from files:* reading data into a buffer, with bounds checking.
3. *writing to files:* writing data from a buffer, again with bounds checking.
4. *error handling:* robust error reporting using rust's `result` type.
5. *c api:* a c-compatible api to use the file operations.

*project structure*



*1. setting up the rust project (cargo.toml)*

create a new rust library project:



modify `cargo.toml`:



*explanation:*

`crate-type = ["cdylib"]`: this tells rust to compile the code into a dynamic library (like a `.so` on linux or a `.dll` on windows) that can be linked to c code.
`libc`: this crate provides rust bindings for common c standard library functions, such as `open`, `read`, `write`, and `close`.

*2. rust library code (src/lib.rs)*



*explanation:*

`[repr(c)]`: ensures that the `filcfile` struct has the ...

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