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Fixes for BufferedWriter and LineBufferedWriter #10738

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Dec 1, 2013
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Fixes for BufferedWriter and LineBufferedWriter #10738

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38 changes: 28 additions & 10 deletions src/libstd/io/buffered.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -166,12 +166,19 @@ impl<W: Writer> BufferedWriter<W> {
pub fn new(inner: W) -> BufferedWriter<W> {
BufferedWriter::with_capacity(DEFAULT_CAPACITY, inner)
}

fn flush_buf(&mut self) {
if self.pos != 0 {
self.inner.write(self.buf.slice_to(self.pos));
self.pos = 0;
}
}
}

impl<W: Writer> Writer for BufferedWriter<W> {
fn write(&mut self, buf: &[u8]) {
if self.pos + buf.len() > self.buf.len() {
self.flush();
self.flush_buf();
}

if buf.len() > self.buf.len() {
Expand All @@ -184,16 +191,13 @@ impl<W: Writer> Writer for BufferedWriter<W> {
}

fn flush(&mut self) {
if self.pos != 0 {
self.inner.write(self.buf.slice_to(self.pos));
self.pos = 0;
}
self.flush_buf();
self.inner.flush();
}
}

impl<W: Writer> Decorator<W> for BufferedWriter<W> {
fn inner(self) -> W { self.inner }
fn inner(mut self) -> W { self.flush_buf(); self.inner }
fn inner_ref<'a>(&'a self) -> &'a W { &self.inner }
fn inner_mut_ref<'a>(&'a mut self) -> &'a mut W { &mut self.inner }
}
Expand All @@ -218,7 +222,7 @@ impl<W: Writer> LineBufferedWriter<W> {

impl<W: Writer> Writer for LineBufferedWriter<W> {
fn write(&mut self, buf: &[u8]) {
match buf.iter().position(|&b| b == '\n' as u8) {
match buf.iter().rposition(|&b| b == '\n' as u8) {
Some(i) => {
self.inner.write(buf.slice_to(i + 1));
self.inner.flush();
Expand Down Expand Up @@ -387,6 +391,15 @@ mod test {
writer.inner_ref().inner_ref().as_slice());
}

#[test]
fn test_buffered_writer_inner_flushes() {
let mut w = BufferedWriter::with_capacity(3, MemWriter::new());
w.write([0, 1]);
assert_eq!([], w.inner_ref().inner_ref().as_slice());
let w = w.inner();
assert_eq!([0, 1], w.inner_ref().as_slice());
}

// This is just here to make sure that we don't infinite loop in the
// newtype struct autoderef weirdness
#[test]
Expand Down Expand Up @@ -430,10 +443,15 @@ mod test {
assert_eq!(*writer.inner_ref().inner_ref(), ~[]);
writer.flush();
assert_eq!(*writer.inner_ref().inner_ref(), ~[0, 1]);
writer.write([0, '\n' as u8, 1]);
assert_eq!(*writer.inner_ref().inner_ref(), ~[0, 1, 0, '\n' as u8]);
writer.write([0, '\n' as u8, 1, '\n' as u8, 2]);
assert_eq!(*writer.inner_ref().inner_ref(),
~[0, 1, 0, '\n' as u8, 1, '\n' as u8]);
writer.flush();
assert_eq!(*writer.inner_ref().inner_ref(), ~[0, 1, 0, '\n' as u8, 1]);
assert_eq!(*writer.inner_ref().inner_ref(),
~[0, 1, 0, '\n' as u8, 1, '\n' as u8, 2]);
writer.write([3, '\n' as u8]);
assert_eq!(*writer.inner_ref().inner_ref(),
~[0, 1, 0, '\n' as u8, 1, '\n' as u8, 2, 3, '\n' as u8]);
}

#[bench]
Expand Down