Rollup merge of rust-lang#72705 - Lucretiel:stdio-forwarding, r=Amanieu

Added io forwarding methods to the stdio structs

Added methods to forward the `io::Read` and `io::Write` methods of the myriad wrapper structs in `stdio.rs` to their underlying readers / writers. This is especially important for the structs on the outside of a locking boundary, to ensure that the lock isn't being dropped and re-acquired in a loop.

src/libstd/io/stdio.rs

@@ -96,7 +96,20 @@ impl Read for StdinRaw {
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
+
+    fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
+        self.0.read_to_end(buf)
+    }
+
+    fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
+        self.0.read_to_string(buf)
+    }
+
+    fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
+        self.0.read_exact(buf)
+    }
 }
+
 impl Write for StdoutRaw {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.0.write(buf)
@@ -114,7 +127,20 @@ impl Write for StdoutRaw {
     fn flush(&mut self) -> io::Result<()> {
         self.0.flush()
     }
+
+    fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+        self.0.write_all(buf)
+    }
+
+    fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
+        self.0.write_all_vectored(bufs)
+    }
+
+    fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
+        self.0.write_fmt(fmt)
+    }
 }
+
 impl Write for StderrRaw {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.0.write(buf)
@@ -132,6 +158,18 @@ impl Write for StderrRaw {
     fn flush(&mut self) -> io::Result<()> {
         self.0.flush()
     }
+
+    fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+        self.0.write_all(buf)
+    }
+
+    fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
+        self.0.write_all_vectored(bufs)
+    }
+
+    fn write_fmt(&mut self, fmt: fmt::Arguments<'_>) -> io::Result<()> {
+        self.0.write_fmt(fmt)
+    }
 }
 
 enum Maybe<T> {
@@ -420,16 +458,37 @@ impl Read for StdinLock<'_> {
     unsafe fn initializer(&self) -> Initializer {
         Initializer::nop()
     }
+
+    fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
+        self.inner.read_to_end(buf)
+    }
+
+    fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
+        self.inner.read_to_string(buf)
+    }
+
+    fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
+        self.inner.read_exact(buf)
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl BufRead for StdinLock<'_> {
     fn fill_buf(&mut self) -> io::Result<&[u8]> {
         self.inner.fill_buf()
     }
+
     fn consume(&mut self, n: usize) {
         self.inner.consume(n)
     }
+
+    fn read_until(&mut self, byte: u8, buf: &mut Vec<u8>) -> io::Result<usize> {
+        self.inner.read_until(byte, buf)
+    }
+
+    fn read_line(&mut self, buf: &mut String) -> io::Result<usize> {
+        self.inner.read_line(buf)
+    }
 }
 
 #[stable(feature = "std_debug", since = "1.16.0")]
@@ -593,6 +652,9 @@ impl Write for Stdout {
     fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
         self.lock().write_all(buf)
     }
+    fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
+        self.lock().write_all_vectored(bufs)
+    }
     fn write_fmt(&mut self, args: fmt::Arguments<'_>) -> io::Result<()> {
         self.lock().write_fmt(args)
     }
@@ -612,6 +674,12 @@ impl Write for StdoutLock<'_> {
     fn flush(&mut self) -> io::Result<()> {
         self.inner.borrow_mut().flush()
     }
+    fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+        self.inner.borrow_mut().write_all(buf)
+    }
+    fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
+        self.inner.borrow_mut().write_all_vectored(bufs)
+    }
 }
 
 #[stable(feature = "std_debug", since = "1.16.0")]
@@ -767,6 +835,9 @@ impl Write for Stderr {
     fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
         self.lock().write_all(buf)
     }
+    fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
+        self.lock().write_all_vectored(bufs)
+    }
     fn write_fmt(&mut self, args: fmt::Arguments<'_>) -> io::Result<()> {
         self.lock().write_fmt(args)
     }
@@ -786,6 +857,12 @@ impl Write for StderrLock<'_> {
     fn flush(&mut self) -> io::Result<()> {
         self.inner.borrow_mut().flush()
     }
+    fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
+        self.inner.borrow_mut().write_all(buf)
+    }
+    fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> io::Result<()> {
+        self.inner.borrow_mut().write_all_vectored(bufs)
+    }
 }
 
 #[stable(feature = "std_debug", since = "1.16.0")]