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Replace std::mem::uninitialized with MaybeUninit (#1027)

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* Replace `std::mem::uninitialized` with `MaybeUninit`

* Avoid undefined behavior when using `MaybeUninit`

* Restore unused `PointerState` fields as internally public

* Zero-initialize some struct values in Xlib FFI calls

* Reform usage of `MaybeUninit` in Xlib FFI

* Prefer safe zero-initialization using `Default`, when possible
* Zero-initialize integers and floats using `0` or `0.0`
* Use `MaybeUninit::uninit` for large byte buffers and union types
* Use `MaybeUninit::uninit` when the resulting value is ignored
This commit is contained in:
Murarth 2019-07-11 09:34:32 -07:00 • committed by Hal Gentz
parent 17b8310517
commit 7daf146801
9 changed files with 186 additions and 126 deletions
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4
src/platform_impl/linux/x11/util/hint.rs
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@ -317,13 +317,13 @@ impl XConnection {
pub fn get_normal_hints(&self, window: ffi::Window) -> Result<NormalHints<'_>, XError> {
let size_hints = self.alloc_size_hints();
let mut supplied_by_user: c_long = unsafe { mem::uninitialized() };
let mut supplied_by_user = MaybeUninit::uninit();
unsafe {
(self.xlib.XGetWMNormalHints)(
self.display,
window,
size_hints.ptr,
&mut supplied_by_user,
supplied_by_user.as_mut_ptr(),
);
}
self.check_errors().map(|_| NormalHints { size_hints })