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use MaybeUninit

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This commit is contained in:
Folkert 2021-06-19 00:46:47 +02:00
parent 53ccef0506
commit 474a0747cd
1 changed files with 4 additions and 6 deletions
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10
examples/cli/platform/src/lib.rs
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@ -3,6 +3,7 @@
use core::alloc::Layout;
use core::ffi::c_void;
use core::mem;
use core::mem::MaybeUninit;
use errno::{errno, Errno};
use libc::{self, c_char, c_int};
use roc_std::{alloca, RocCallResult, RocList, RocResult, RocStr};
@ -167,10 +168,7 @@ pub struct Fd(c_int);
pub unsafe fn roc_fx_open(roc_path: RocStr) -> RocResult<Fd, Errno> {
const BUF_BYTES: usize = 256;
// I know that since Rust 1.39 mem::uninitialized() is deprecated in favor
// of MaybeUninit, but I couldn't get this to work with MaybeUninit.
#[allow(deprecated)]
let mut buf: [u8; BUF_BYTES] = mem::uninitialized();
let mut buf: MaybeUninit<[u8; BUF_BYTES]> = MaybeUninit::uninit();
// If the path fits in the stack-allocated buffer, we can avoid a heap
// allocation when translating our `RocStr` to a null-terminated `char*`.
@ -179,9 +177,9 @@ pub unsafe fn roc_fx_open(roc_path: RocStr) -> RocResult<Fd, Errno> {
let c_path: *mut c_char;
if path_fits_in_buf {
roc_path.write_c_str(&mut buf as *mut u8);
roc_path.write_c_str(buf.as_mut_ptr() as *mut u8);
c_path = buf.as_mut_ptr() as *mut c_char;
c_path = buf.assume_init().as_mut_ptr() as *mut c_char;
} else {
c_path = roc_alloc(path_len, mem::align_of::<c_char>() as u32) as *mut c_char;