cfn_guard/rules/libyaml/
util.rs

1use std::{
2    marker::PhantomData,
3    mem::{self, MaybeUninit},
4    ops::Deref,
5    ptr::{addr_of, NonNull},
6};
7
8use crate::rules::path_value::Location;
9#[allow(clippy::unsafe_removed_from_name)]
10use unsafe_libyaml as sys;
11
12pub(crate) struct Owned<T, Init = T> {
13    ptr: NonNull<T>,
14    marker: PhantomData<NonNull<Init>>,
15}
16
17impl<T> Owned<T> {
18    pub fn new_uninit() -> Owned<MaybeUninit<T>, T> {
19        // FIXME: use Box::new_uninit when stable
20        let boxed = Box::new(MaybeUninit::<T>::uninit());
21        Owned {
22            ptr: unsafe { NonNull::new_unchecked(Box::into_raw(boxed)) },
23            marker: PhantomData,
24        }
25    }
26
27    pub unsafe fn assume_init(definitely_init: Owned<MaybeUninit<T>, T>) -> Owned<T> {
28        let ptr = definitely_init.ptr;
29        mem::forget(definitely_init);
30        Owned {
31            ptr: ptr.cast(),
32            marker: PhantomData,
33        }
34    }
35}
36
37#[repr(transparent)]
38pub(crate) struct InitPtr<T> {
39    pub ptr: *mut T,
40}
41
42impl<T, Init> Deref for Owned<T, Init> {
43    type Target = InitPtr<Init>;
44
45    fn deref(&self) -> &Self::Target {
46        unsafe { &*addr_of!(self.ptr).cast::<InitPtr<Init>>() }
47    }
48}
49
50impl<T, Init> Drop for Owned<T, Init> {
51    fn drop(&mut self) {
52        let _ = unsafe { Box::from_raw(self.ptr.as_ptr()) };
53    }
54}
55
56pub(crate) fn system_mark_to_location(mark: sys::yaml_mark_t) -> Location {
57    Location {
58        line: mark.line as usize,
59        col: mark.column as usize,
60    }
61}
cfn_guard/rules/libyaml/util.rs

cfn_guard/rules/libyaml/
util.rs
