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Implement read*_exact for std:io::repeat #136818

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Merged
merged 1 commit into from
Feb 13, 2025
Merged

Implement read*_exact for std:io::repeat #136818

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11 changes: 11 additions & 0 deletions library/std/src/io/util.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,13 @@ impl Read for Repeat {
Ok(buf.len())
}

fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
for slot in &mut *buf {
*slot = self.byte;
}
Ok(())
}

fn read_buf(&mut self, mut buf: BorrowedCursor<'_>) -> io::Result<()> {
// SAFETY: No uninit bytes are being written
for slot in unsafe { buf.as_mut() } {
Expand All @@ -204,6 +211,10 @@ impl Read for Repeat {
Ok(())
}

fn read_buf_exact(&mut self, buf: BorrowedCursor<'_>) -> io::Result<()> {
self.read_buf(buf)
}

/// This function is not supported by `io::Repeat`, because there's no end of its data
fn read_to_end(&mut self, _: &mut Vec<u8>) -> io::Result<usize> {
Err(io::Error::from(io::ErrorKind::OutOfMemory))
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