sudo-rs 0.2.9

A memory safe implementation of sudo and su.
Documentation 
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// the `std::print` macros panic on any IO error. these are non-panicking alternatives
macro_rules! println_ignore_io_error {
    ($($tt:tt)*) => {{
        use std::io::Write;
        let _ = writeln!(std::io::stdout(), $($tt)*);
    }}
}

macro_rules! eprintln_ignore_io_error {
    ($($tt:tt)*) => {{
        use std::io::Write;
        let _ = writeln!(std::io::stderr(), $($tt)*);
    }}
}

// catch unintentional uses of `print*` macros with the test suite
#[allow(unused_macros)]
#[cfg(debug_assertions)]
macro_rules! eprintln {
    ($($tt:tt)*) => {
        compile_error!("do not use `eprintln!`; use the `write!` macro instead")
    };
}

#[allow(unused_macros)]
#[cfg(debug_assertions)]
macro_rules! eprint {
    ($($tt:tt)*) => {
        compile_error!("do not use `eprint!`; use the `write!` macro instead")
    };
}

#[allow(unused_macros)]
#[cfg(debug_assertions)]
macro_rules! println {
    ($($tt:tt)*) => {
        compile_error!("do not use `println!`; use the `write!` macro instead")
    };
}

#[allow(unused_macros)]
#[cfg(debug_assertions)]
macro_rules! print {
    ($($tt:tt)*) => {
        compile_error!("do not use `print!`; use the `write!` macro instead")
    };
}

macro_rules! cstr {
    ($lit:literal) => {{
        // this `const` item produces compile time errors = it performs the checks at compile time
        const CS: &'static std::ffi::CStr =
            match std::ffi::CStr::from_bytes_until_nul(concat!($lit, "\0").as_bytes()) {
                Ok(x) => x,
                Err(_) => panic!("string literal did not pass CStr checks"),
            };
        CS
    }};
}