bjoernager/rust
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use memset to initialize a readbuf

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The 8472 2022-10-08 12:55:43 +02:00
parent 43c22af267
commit b9e4a1cf26
1 changed files with 6 additions and 3 deletions
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9
library/std/src/io/readbuf.rs
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@ -3,10 +3,10 @@
#[cfg(test)]
mod tests;
use crate::cmp;
use crate::fmt::{self, Debug, Formatter};
use crate::io::{Result, Write};
use crate::mem::{self, MaybeUninit};
use crate::{cmp, ptr};
/// A borrowed byte buffer which is incrementally filled and initialized.
///
@ -250,8 +250,11 @@ impl<'a> BorrowedCursor<'a> {
/// Initializes all bytes in the cursor.
#[inline]
pub fn ensure_init(&mut self) -> &mut Self {
for byte in self.uninit_mut() {
byte.write(0);
let uninit = self.uninit_mut();
// SAFETY: 0 is a valid value for MaybeUninit<u8> and the length matches the allocation
// since it is comes from a slice reference.
unsafe {
ptr::write_bytes(uninit.as_mut_ptr(), 0, uninit.len());
}
self.buf.init = self.buf.capacity();