Implement io::native::stdio

Author: alexcrichton

src/libstd/rt/io/native/stdio.rs

@@ -0,0 +1,67 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use libc;
+use option::Option;
+use rt::io::{Reader, Writer};
+use super::file;
+
+/// Creates a new handle to the stdin of this process
+pub fn stdin() -> StdIn { StdIn::new() }
+/// Creates a new handle to the stdout of this process
+pub fn stdout() -> StdOut { StdOut::new(libc::STDOUT_FILENO) }
+/// Creates a new handle to the stderr of this process
+pub fn stderr() -> StdOut { StdOut::new(libc::STDERR_FILENO) }
+
+pub fn print(s: &str) {
+    stdout().write(s.as_bytes())
+}
+
+pub fn println(s: &str) {
+    let mut out = stdout();
+    out.write(s.as_bytes());
+    out.write(['\n' as u8]);
+}
+
+pub struct StdIn {
+    priv fd: file::FileDesc
+}
+
+impl StdIn {
+    /// Duplicates the stdin file descriptor, returning an io::Reader
+    #[fixed_stack_segment] #[inline(never)]
+    pub fn new() -> StdIn {
+        let fd = unsafe { libc::dup(libc::STDIN_FILENO) };
+        StdIn { fd: file::FileDesc::new(fd) }
+    }
+}
+
+impl Reader for StdIn {
+    fn read(&mut self, buf: &mut [u8]) -> Option<uint> { self.fd.read(buf) }
+    fn eof(&mut self) -> bool { self.fd.eof() }
+}
+
+pub struct StdOut {
+    priv fd: file::FileDesc
+}
+
+impl StdOut {
+    /// Duplicates the specified file descriptor, returning an io::Writer
+    #[fixed_stack_segment] #[inline(never)]
+    pub fn new(fd: file::fd_t) -> StdOut {
+        let fd = unsafe { libc::dup(fd) };
+        StdOut { fd: file::FileDesc::new(fd) }
+    }
+}
+
+impl Writer for StdOut {
+    fn write(&mut self, buf: &[u8]) { self.fd.write(buf) }
+    fn flush(&mut self) { self.fd.flush() }
+}