getpwnam.rs

extern crate libc;

use libc::{passwd, getpwent, setpwent};
use std::ffi::CString;

unsafe fn getpwnam(name: &str) -> Option<passwd> {
    setpwent();
    while let Some(pw) = getpwent().as_ref() {
        let pw_name = CString::from_raw(pw.pw_name).into_string().expect("found null");
        if pw_name == name {
            return Some(pw.clone());
        }
    }
    None
}

fn main() {
    unsafe {
        match getpwnam("philipp") {
            Some(pw) => {
                println!("name: {:?}, uid: {:?}, gid: {:?}",
                         CString::from_raw(pw.pw_name).into_string().unwrap(),
                         pw.pw_uid,
                         pw.pw_gid)
            }
            None => println!("found no user"),
        }
    }
}