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Avoid panic branch in EscapeDefault::backslash and EscapeDebug::backslash. #121805

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Avoid panic branch in EscapeDefault::backslash and EscapeDebug::backslash. #121805

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8 changes: 7 additions & 1 deletion library/core/src/escape.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
use crate::ascii;
use crate::num::NonZero;
use crate::ops::Range;
use crate::ptr;

const HEX_DIGITS: [ascii::Char; 16] = *b"0123456789abcdef".as_ascii().unwrap();

Expand Down Expand Up @@ -82,7 +83,12 @@ impl<const N: usize> EscapeIterInner<N> {
const { assert!(M <= N) };

let mut data = [ascii::Char::Null; N];
data[..M].copy_from_slice(&array);

// SAFETY: `M` is smaller than or equal to `N`, and `data` does not overlap `array`.
unsafe {
ptr::copy_nonoverlapping(array.as_ptr(), data.as_mut_ptr(), M);
}

Self::new(data, 0..M as u8)
}

Expand Down