clucstr

Secure creation of CStr with zero cost. Plugin for rust compiler.

Use

```

![feature(plugin)]

![plugin(clucstr)]

use std::ffi::CStr;

fn main() { let cstr = cstr!("cluWorld!!!"); let cstrbarr = cstr!(b"cluWorld!!!"); let cstr_b = cstr!(b'A'); } ```

```

![feature(plugin)]

![plugin(clucstr)]

use std::ffi::CStr;

fn main() { println_str(cstr!("cluWorld!!!")); //CSTR "cluWorld!!!" //CArray [99, 108, 117, 87, 111, 114, 108, 100, 33, 33, 33, 0] 12

println_str(cstr!(b"cluWorld!!!"));
//CSTR "cluWorld!!!"
//CArray [99, 108, 117, 87, 111, 114, 108, 100, 33, 33, 33, 0] 12

println_str(cstr!(b'A'));
//CSTR "A"
//CArray [65, 0] 2

}

fn println_str(cstr: &CStr) { println!("CSTR {:?}", cstr);

let cstr_array = cstr.to_bytes_with_nul();
println!("CArray {:?} {}", cstr_array, cstr_array.len());
println!();

} ```

Panic

```

![feature(plugin)]

![plugin(clucstr)]

use std::ffi::CStr;

fn main() { let cstr = cstr!("\0Teststr"); // PANIC! A null byte was found.

let c_str = cstr!(b"\0Test_array"); 
// PANIC! A null byte was found.

let c_str = cstr!("Test_str\0"); 
//It is allowed to write since the null byte is at the end.

let c_str = cstr!(b"Test_str\0"); 
//It is allowed to write since the null byte is at the end.

} ```

Benchmarking

cstr_macros - old method of converting strings to cstr. Note that in CStr, there is no protection from null bytes.

cstr_plugin - new method for converting strings to cstr. ```

![feature(plugin)]

![plugin(clucstr)]

![feature(test)]

extern crate test; use std::ffi::CStr;

[macro_export]

macrorules! cstrmacro { ($s:expr) => { unsafe { ::std::ffi::CStr::fromptr( concat!($s, "\0") as *const str
as *const [::std::os::raw::cchar] as *const ::std::os::raw::c_char ) } }; }

[cfg(test)]

mod tests { use super::*; use test::Bencher;

#[bench]
fn cstr_plugin(b: &mut Bencher) {
    b.iter(|| {
    for _a in 0..10 {
        let _cstr0 = cstr!(b"test");
    }       
});
}
#[bench]
fn cstr_macros(b: &mut Bencher) {
    b.iter(|| {
    for _a in 0..10 {
        let _cstr0 = cstr_macro!("test");
    }
});
}

} ``` running 2 tests

test tests::cstr_macros ... bench: 90 ns/iter (+/- 14)

test tests::cstr_plugin ... bench: 0 ns/iter (+/- 0)

License

Copyright 2018 #UlinProject Денис Котляров

Licensed under the Apache License, Version 2.0