cstr

A macro for getting &'static CStr from literal or identifier.

This macro checks whether the given literal is valid for CStr at compile time, and returns a static reference of CStr.

Note that it currently cannot be used to initialize constants due to restriction of Rust.

Also, it currently only supports a UTF-8 string as input because Rust's tokenizer only accepts that without the b prefix. This may be expanded in the future if necessary.

Example

```rust

[macro_use] extern crate cstr;

use std::ffi::CStr;

fn main() { let test = cstr!("hello"); asserteq!(test, CStr::frombyteswithnul(b"hello\0").unwrap()); let test = cstr!(hello); asserteq!(test, CStr::frombyteswithnul(b"hello\0").unwrap()); } ```

Note for 2018 edition

On Rust 2018 edition, you can not simply use cstr::cstr!(...) or use cstr::cstr; due to limitation of procedural-masquerade, the crate we use to build this macro.

You need to stick with 2015 edition's #[macro_use] or import everything from this crate via use cstr::*;.