Book Image

Mastering Rust. - Second Edition

By : Rahul Sharma
Book Image

Mastering Rust. - Second Edition

By: Rahul Sharma

Overview of this book

Rust is an empowering language that provides a rare combination of safety, speed, and zero-cost abstractions. Mastering Rust – Second Edition is filled with clear and simple explanations of the language features along with real-world examples, showing you how you can build robust, scalable, and reliable programs. This second edition of the book improves upon the previous one and touches on all aspects that make Rust a great language. We have included the features from latest Rust 2018 edition such as the new module system, the smarter compiler, helpful error messages, and the stable procedural macros. You’ll learn how Rust can be used for systems programming, network programming, and even on the web. You’ll also learn techniques such as writing memory-safe code, building idiomatic Rust libraries, writing efficient asynchronous networking code, and advanced macros. The book contains a mix of theory and hands-on tasks so you acquire the skills as well as the knowledge, and it also provides exercises to hammer the concepts in. After reading this book, you will be able to implement Rust for your enterprise projects, write better tests and documentation, design for performance, and write idiomatic Rust code.
Table of Contents (19 chapters)

Calling C code from Rust

First, we'll take a look at an example of calling C code from Rust. We'll create a new binary crate from which we'll call our C function that's defined in a separate C file. Let's create a new project by running cargo new c_from_rust. Within the directory, we'll also add our C source, that is, the mystrlen.c file, which has the following code inside it:

// c_from_rust/mystrlen.c

unsigned int mystrlen(char *str) {
unsigned int c;
for (c = 0; *str != '\0'; c++, *str++);
return c;

It contains a simple function, mystrlen, which returns the length of a string passed to it. We want to invoke mystrlen from Rust. To do that, we'll need to compile this C source into a static library. There's one more example in the upcoming section, where we cover linking dynamically to a shared library. We'll...