Add `Read::initializer`.

This is an API that allows types to indicate that they can be passed
buffers of uninitialized memory which can improve performance.

6 files changed, 7 insertions, 29 deletions

diff --git a/src/libstd/sys/unix/ext/net.rs b/src/libstd/sys/unix/ext/net.rs
index d688f2fa504..94b87a6bff4 100644
--- a/src/libstd/sys/unix/ext/net.rs
+++ b/src/libstd/sys/unix/ext/net.rs
@@ -17,7 +17,7 @@ use libc;
 use ascii;
 use ffi::OsStr;
 use fmt;
-use io;
+use io::{self, Initializer};
 use mem;
 use net::Shutdown;
 use os::unix::ffi::OsStrExt;
@@ -516,8 +516,9 @@ impl io::Read for UnixStream {
         io::Read::read(&mut &*self, buf)
     }
 
-    fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
-        io::Read::read_to_end(&mut &*self, buf)
+    #[inline]
+    unsafe fn initializer(&self) -> Initializer {
+        Initializer::nop()
     }
 }
 
@@ -527,8 +528,9 @@ impl<'a> io::Read for &'a UnixStream {
         self.0.read(buf)
     }
 
-    fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
-        self.0.read_to_end(buf)
+    #[inline]
+    unsafe fn initializer(&self) -> Initializer {
+        Initializer::nop()
     }
 }
 
diff --git a/src/libstd/sys/unix/fd.rs b/src/libstd/sys/unix/fd.rs
index 405fac2b9d7..138087f1651 100644
--- a/src/libstd/sys/unix/fd.rs
+++ b/src/libstd/sys/unix/fd.rs
@@ -17,7 +17,6 @@ use mem;
 use sync::atomic::{AtomicBool, Ordering};
 use sys::cvt;
 use sys_common::AsInner;
-use sys_common::io::read_to_end_uninitialized;
 
 #[derive(Debug)]
 pub struct FileDesc {
@@ -232,10 +231,6 @@ impl<'a> Read for &'a FileDesc {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
         (**self).read(buf)
     }
-
-    fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
-        unsafe { read_to_end_uninitialized(self, buf) }
-    }
 }
 
 impl AsInner<c_int> for FileDesc {
diff --git a/src/libstd/sys/unix/fs.rs b/src/libstd/sys/unix/fs.rs
index e893a139094..59dceba8953 100644
--- a/src/libstd/sys/unix/fs.rs
+++ b/src/libstd/sys/unix/fs.rs
@@ -491,10 +491,6 @@ impl File {
         self.0.read(buf)
     }
 
-    pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
-        self.0.read_to_end(buf)
-    }
-
     pub fn read_at(&self, buf: &mut [u8], offset: u64) -> io::Result<usize> {
         self.0.read_at(buf, offset)
     }
diff --git a/src/libstd/sys/unix/net.rs b/src/libstd/sys/unix/net.rs
index 5efddca110f..8fb361a78e2 100644
--- a/src/libstd/sys/unix/net.rs
+++ b/src/libstd/sys/unix/net.rs
@@ -198,10 +198,6 @@ impl Socket {
         self.recv_from_with_flags(buf, MSG_PEEK)
     }
 
-    pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
-        self.0.read_to_end(buf)
-    }
-
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.0.write(buf)
     }
diff --git a/src/libstd/sys/unix/pipe.rs b/src/libstd/sys/unix/pipe.rs
index ca5ef4bcfc5..ec9b6f17dca 100644
--- a/src/libstd/sys/unix/pipe.rs
+++ b/src/libstd/sys/unix/pipe.rs
@@ -71,10 +71,6 @@ impl AnonPipe {
         self.0.read(buf)
     }
 
-    pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
-        self.0.read_to_end(buf)
-    }
-
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.0.write(buf)
     }
diff --git a/src/libstd/sys/unix/stdio.rs b/src/libstd/sys/unix/stdio.rs
index 6d38b00b39e..7a8fe25d98e 100644
--- a/src/libstd/sys/unix/stdio.rs
+++ b/src/libstd/sys/unix/stdio.rs
@@ -25,13 +25,6 @@ impl Stdin {
         fd.into_raw();
         ret
     }
-
-    pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
-        let fd = FileDesc::new(libc::STDIN_FILENO);
-        let ret = fd.read_to_end(buf);
-        fd.into_raw();
-        ret
-    }
 }
 
 impl Stdout {