posix-acl 1.2.0

Simple library to interact with POSIX filesystem ACLs
Documentation 
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//! This file is for small helpers & utilities that aren't exported by the library.
use acl_sys::acl_free;
use std::ffi::CString;
use std::io;
use std::os::raw::c_void;
use std::os::unix::ffi::OsStrExt;
use std::path::Path;

/// NB! Unix-only
pub(crate) fn path_to_cstring(path: &Path) -> CString {
    CString::new(path.as_os_str().as_bytes()).unwrap()
}

/// Safe wrapper around C pointers to automatically free when going out of scope.
pub(crate) struct AutoPtr<T>(pub(crate) *mut T);

impl<T> Drop for AutoPtr<T> {
    fn drop(&mut self) {
        let ret = unsafe { acl_free(self.0.cast::<c_void>()) };
        check_return(ret, "acl_free");
    }
}

pub(crate) fn check_return(ret: i32, func: &str) {
    assert_eq!(ret, 0, "Error in {}: {}", func, io::Error::last_os_error());
}

pub(crate) fn check_pointer<T: ?Sized>(ret: *const T, func: &str) {
    assert!(
        !ret.is_null(),
        "Error in {}: {}",
        func,
        io::Error::last_os_error()
    );
}