Macro cstr 

cstr!() { /* proc-macro */ }

cstr checks its input for null bytes and, if none are found, generates an &'static CStr. It must be provided a string literal.

Examples

use std::ffi::CStr;
use constant_cstr::cstr;

const DEV_PTMX: &'static CStr = cstr!("/dev/ptmx");

Passing an input string with a null byte will cause a compile error with a message indicating the position of the null byte:

use std::ffi::CStr;
use constant_cstr::cstr;

const HELLO: &'static CStr = cstr!("Hell\0, world");

error: proc macro panicked
  --> src/example.rs:4:34
   |
 4 |     const HELLO: &'static CStr = cstr!("Hell\0, world");
   |                                  ^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: message: "Hell\0, world" contains a null byte at position 4