Few doubts about Boring and certificates about boring HOT 2 OPEN

// Licensed under CC0

extern "C" {
    fn putenv(s: *const u8) -> usize;
}

extern "C" {
    fn getenv(s: *const u8) -> *const u8;
}

fn main() {
    unsafe { putenv("SOMETHING=ISUP\0".as_bytes().as_ptr()) };

    // Environment variable is returned to us in a form of a pointer
    let env_ptr = unsafe { getenv("SOMETHING\0".as_bytes().as_ptr()) };
    assert_ne!(env_ptr as usize, 0);
    
    // If we get a null pointer, the environment variable is non existent
    let env_ptr = unsafe { getenv("ELSE\0".as_bytes().as_ptr()) };
    assert_eq!(env_ptr as usize, 0);
}