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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /third_party/rust/futures-util/src/io/write_all.rs
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/futures-util/src/io/write_all.rs')
-rw-r--r--third_party/rust/futures-util/src/io/write_all.rs43
1 files changed, 43 insertions, 0 deletions
diff --git a/third_party/rust/futures-util/src/io/write_all.rs b/third_party/rust/futures-util/src/io/write_all.rs
new file mode 100644
index 0000000000..08c025f94d
--- /dev/null
+++ b/third_party/rust/futures-util/src/io/write_all.rs
@@ -0,0 +1,43 @@
+use futures_core::future::Future;
+use futures_core::ready;
+use futures_core::task::{Context, Poll};
+use futures_io::AsyncWrite;
+use std::io;
+use std::mem;
+use std::pin::Pin;
+
+/// Future for the [`write_all`](super::AsyncWriteExt::write_all) method.
+#[derive(Debug)]
+#[must_use = "futures do nothing unless you `.await` or poll them"]
+pub struct WriteAll<'a, W: ?Sized> {
+ writer: &'a mut W,
+ buf: &'a [u8],
+}
+
+impl<W: ?Sized + Unpin> Unpin for WriteAll<'_, W> {}
+
+impl<'a, W: AsyncWrite + ?Sized + Unpin> WriteAll<'a, W> {
+ pub(super) fn new(writer: &'a mut W, buf: &'a [u8]) -> Self {
+ Self { writer, buf }
+ }
+}
+
+impl<W: AsyncWrite + ?Sized + Unpin> Future for WriteAll<'_, W> {
+ type Output = io::Result<()>;
+
+ fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+ let this = &mut *self;
+ while !this.buf.is_empty() {
+ let n = ready!(Pin::new(&mut this.writer).poll_write(cx, this.buf))?;
+ {
+ let (_, rest) = mem::take(&mut this.buf).split_at(n);
+ this.buf = rest;
+ }
+ if n == 0 {
+ return Poll::Ready(Err(io::ErrorKind::WriteZero.into()));
+ }
+ }
+
+ Poll::Ready(Ok(()))
+ }
+}