35 lines
1.0 KiB
Rust
35 lines
1.0 KiB
Rust
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use crate::fmt;
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use crate::str;
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/// Used for slow path in `Display` implementations when alignment is required.
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pub struct IpDisplayBuffer<const SIZE: usize> {
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buf: [u8; SIZE],
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len: usize,
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}
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impl<const SIZE: usize> IpDisplayBuffer<SIZE> {
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#[inline(always)]
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pub const fn new(_ip: &[u8; SIZE]) -> Self {
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Self { buf: [0; SIZE], len: 0 }
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}
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#[inline(always)]
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pub fn as_str(&self) -> &str {
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// SAFETY: `buf` is only written to by the `fmt::Write::write_str` implementation
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// which writes a valid UTF-8 string to `buf` and correctly sets `len`.
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unsafe { str::from_utf8_unchecked(&self.buf[..self.len]) }
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}
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}
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impl<const SIZE: usize> fmt::Write for IpDisplayBuffer<SIZE> {
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fn write_str(&mut self, s: &str) -> fmt::Result {
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if let Some(buf) = self.buf.get_mut(self.len..(self.len + s.len())) {
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buf.copy_from_slice(s.as_bytes());
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self.len += s.len();
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Ok(())
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} else {
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Err(fmt::Error)
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}
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}
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}
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