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.

Example

```rust use cstr::cstr; use std::ffi::CStr;

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