systemd 0.4.0

A rust interface to libsystemd provided APIs
Documentation 
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//! APIs to process and generate 128-bit ID values for systemd.
//!
//! These ID values are a generalization of OSF UUIDs but use a
//! simpler string format. See `man 3 sd-id128` for more details.

use super::Result;
use ffi;
use std::ffi::CStr;
use std::fmt;

/// A 128-bit ID for systemd.
pub struct Id128 {
    pub(crate) inner: ffi::id128::sd_id128_t,
}

impl fmt::Display for Id128 {
    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
        for b in self.inner.bytes.iter() {
            try!(write!(fmt, "{:02x}", b));
        }
        Ok(())
    }
}

impl Default for Id128 {
    /// Return a null-ID, consisting of only NUL bytes.
    fn default() -> Self {
        Id128 {
            inner: ffi::id128::sd_id128_t { bytes: [0x00; 16] },
        }
    }
}

impl Id128 {
    pub fn from_cstr(s: &CStr) -> Result<Id128> {
        let mut r = Id128::default();
        sd_try!(ffi::id128::sd_id128_from_string(s.as_ptr(), &mut r.inner));
        Ok(r)
    }

    pub fn from_random() -> Result<Id128> {
        let mut r = Id128::default();
        sd_try!(ffi::id128::sd_id128_randomize(&mut r.inner));
        Ok(r)
    }

    pub fn from_machine() -> Result<Id128> {
        let mut r = Id128::default();
        sd_try!(ffi::id128::sd_id128_get_machine(&mut r.inner));
        Ok(r)
    }

    pub fn from_boot() -> Result<Id128> {
        let mut r = Id128::default();
        sd_try!(ffi::id128::sd_id128_get_boot(&mut r.inner));
        Ok(r)
    }

    pub fn as_bytes(&self) -> &[u8; 16] {
        &self.inner.bytes
    }
}

impl PartialEq for Id128 {
    fn eq(&self, other: &Id128) -> bool {
        self.inner.bytes == other.inner.bytes
    }
}

impl Clone for Id128 {
    fn clone(&self) -> Self {
        Id128 { inner: ffi::id128::sd_id128_t { bytes: self.inner.bytes.clone() } }
    }
}