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stdio.rs
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stdio.rs
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// Copyright 2015 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.
#![unstable(issue = "0", feature = "windows_stdio")]
use io::prelude::*;
use cmp;
use io::{self, Cursor};
use ptr;
use str;
use sync::Mutex;
use sys::c;
use sys::cvt;
use sys::handle::Handle;
pub enum Output {
Console(c::HANDLE),
Pipe(c::HANDLE),
}
pub struct Stdin {
utf8: Mutex<io::Cursor<Vec<u8>>>,
}
pub struct Stdout;
pub struct Stderr;
pub fn get(handle: c::DWORD) -> io::Result<Output> {
let handle = unsafe { c::GetStdHandle(handle) };
if handle == c::INVALID_HANDLE_VALUE {
Err(io::Error::last_os_error())
} else if handle.is_null() {
Err(io::Error::from_raw_os_error(c::ERROR_INVALID_HANDLE as i32))
} else {
let mut out = 0;
match unsafe { c::GetConsoleMode(handle, &mut out) } {
0 => Ok(Output::Pipe(handle)),
_ => Ok(Output::Console(handle)),
}
}
}
fn write(handle: c::DWORD, data: &[u8]) -> io::Result<usize> {
let handle = match get(handle)? {
Output::Console(c) => c,
Output::Pipe(p) => {
let handle = Handle::new(p);
let ret = handle.write(data);
handle.into_raw();
return ret
}
};
// As with stdin on windows, stdout often can't handle writes of large
// sizes. For an example, see #14940. For this reason, don't try to
// write the entire output buffer on windows.
//
// For some other references, it appears that this problem has been
// encountered by others [1] [2]. We choose the number 8K just because
// libuv does the same.
//
// [1]: https://tahoe-lafs.org/trac/tahoe-lafs/ticket/1232
// [2]: http://www.mail-archive.com/log4net-dev@logging.apache.org/msg00661.html
const OUT_MAX: usize = 8192;
let len = cmp::min(data.len(), OUT_MAX);
let utf8 = match str::from_utf8(&data[..len]) {
Ok(s) => s,
Err(ref e) if e.valid_up_to() == 0 => return Err(invalid_encoding()),
Err(e) => str::from_utf8(&data[..e.valid_up_to()]).unwrap(),
};
let utf16 = utf8.encode_utf16().collect::<Vec<u16>>();
let mut written = 0;
cvt(unsafe {
c::WriteConsoleW(handle,
utf16.as_ptr() as c::LPCVOID,
utf16.len() as u32,
&mut written,
ptr::null_mut())
})?;
// FIXME if this only partially writes the utf16 buffer then we need to
// figure out how many bytes of `data` were actually written
assert_eq!(written as usize, utf16.len());
Ok(utf8.len())
}
impl Stdin {
pub fn new() -> io::Result<Stdin> {
Ok(Stdin {
utf8: Mutex::new(Cursor::new(Vec::new())),
})
}
pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
let handle = match get(c::STD_INPUT_HANDLE)? {
Output::Console(c) => c,
Output::Pipe(p) => {
let handle = Handle::new(p);
let ret = handle.read(buf);
handle.into_raw();
return ret
}
};
let mut utf8 = self.utf8.lock().unwrap();
// Read more if the buffer is empty
if utf8.position() as usize == utf8.get_ref().len() {
let mut utf16 = vec![0u16; 0x1000];
let mut num = 0;
let mut input_control = readconsole_input_control(CTRL_Z_MASK);
cvt(unsafe {
c::ReadConsoleW(handle,
utf16.as_mut_ptr() as c::LPVOID,
utf16.len() as u32,
&mut num,
&mut input_control as c::PCONSOLE_READCONSOLE_CONTROL)
})?;
utf16.truncate(num as usize);
// FIXME: what to do about this data that has already been read?
let mut data = match String::from_utf16(&utf16) {
Ok(utf8) => utf8.into_bytes(),
Err(..) => return Err(invalid_encoding()),
};
if let Some(&last_byte) = data.last() {
if last_byte == CTRL_Z {
data.pop();
}
}
*utf8 = Cursor::new(data);
}
// MemReader shouldn't error here since we just filled it
utf8.read(buf)
}
pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
let mut me = self;
(&mut me).read_to_end(buf)
}
}
#[unstable(reason = "not public", issue = "0", feature = "fd_read")]
impl<'a> Read for &'a Stdin {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
(**self).read(buf)
}
}
impl Stdout {
pub fn new() -> io::Result<Stdout> {
Ok(Stdout)
}
pub fn write(&self, data: &[u8]) -> io::Result<usize> {
write(c::STD_OUTPUT_HANDLE, data)
}
pub fn flush(&self) -> io::Result<()> {
Ok(())
}
}
impl Stderr {
pub fn new() -> io::Result<Stderr> {
Ok(Stderr)
}
pub fn write(&self, data: &[u8]) -> io::Result<usize> {
write(c::STD_ERROR_HANDLE, data)
}
pub fn flush(&self) -> io::Result<()> {
Ok(())
}
}
// FIXME: right now this raw stderr handle is used in a few places because
// std::io::stderr_raw isn't exposed, but once that's exposed this impl
// should go away
impl io::Write for Stderr {
fn write(&mut self, data: &[u8]) -> io::Result<usize> {
Stderr::write(self, data)
}
fn flush(&mut self) -> io::Result<()> {
Stderr::flush(self)
}
}
impl Output {
pub fn handle(&self) -> c::HANDLE {
match *self {
Output::Console(c) => c,
Output::Pipe(c) => c,
}
}
}
fn invalid_encoding() -> io::Error {
io::Error::new(io::ErrorKind::InvalidData, "text was not valid unicode")
}
fn readconsole_input_control(wakeup_mask: c::ULONG) -> c::CONSOLE_READCONSOLE_CONTROL {
c::CONSOLE_READCONSOLE_CONTROL {
nLength: ::mem::size_of::<c::CONSOLE_READCONSOLE_CONTROL>() as c::ULONG,
nInitialChars: 0,
dwCtrlWakeupMask: wakeup_mask,
dwControlKeyState: 0,
}
}
const CTRL_Z: u8 = 0x1A;
const CTRL_Z_MASK: c::ULONG = 0x4000000; //1 << 0x1A
pub fn is_ebadf(err: &io::Error) -> bool {
err.raw_os_error() == Some(c::ERROR_INVALID_HANDLE as i32)
}
// The default buffer capacity is 64k, but apparently windows
// doesn't like 64k reads on stdin. See #13304 for details, but the
// idea is that on windows we use a slightly smaller buffer that's
// been seen to be acceptable.
pub const STDIN_BUF_SIZE: usize = 8 * 1024;
pub fn stderr_prints_nothing() -> bool {
false
}