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read_buf_exact: on error, all read bytes are appended to the buffer #109022

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Mar 19, 2023
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18 changes: 16 additions & 2 deletions library/std/src/io/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -823,8 +823,22 @@ pub trait Read {

/// Read the exact number of bytes required to fill `cursor`.
///
/// This is equivalent to the [`read_exact`](Read::read_exact) method, except that it is passed a [`BorrowedCursor`] rather than `[u8]` to
/// allow use with uninitialized buffers.
/// This is similar to the [`read_exact`](Read::read_exact) method, except
/// that it is passed a [`BorrowedCursor`] rather than `[u8]` to allow use
/// with uninitialized buffers.
///
/// # Errors
///
/// If this function encounters an error of the kind [`ErrorKind::Interrupted`]
/// then the error is ignored and the operation will continue.
///
/// If this function encounters an "end of file" before completely filling
/// the buffer, it returns an error of the kind [`ErrorKind::UnexpectedEof`].
///
/// If any other read error is encountered then this function immediately
/// returns.
///
/// If this function returns an error, all bytes read will be appended to `cursor`.
#[unstable(feature = "read_buf", issue = "78485")]
fn read_buf_exact(&mut self, mut cursor: BorrowedCursor<'_>) -> Result<()> {
while cursor.capacity() > 0 {
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