| use crate::io; |
| |
| pub struct Stdin; |
| pub struct Stdout; |
| pub struct Stderr; |
| |
| impl Stdin { |
| pub const fn new() -> Stdin { |
| Stdin |
| } |
| } |
| |
| impl io::Read for Stdin { |
| fn read(&mut self, _buf: &mut [u8]) -> io::Result<usize> { |
| Ok(0) |
| } |
| } |
| |
| impl Stdout { |
| pub const fn new() -> Stdout { |
| Stdout |
| } |
| } |
| |
| impl io::Write for Stdout { |
| fn write(&mut self, buf: &[u8]) -> io::Result<usize> { |
| _write(libc::STDOUT_FILENO, buf) |
| } |
| |
| fn flush(&mut self) -> io::Result<()> { |
| Ok(()) |
| } |
| } |
| |
| impl Stderr { |
| pub const fn new() -> Stderr { |
| Stderr |
| } |
| } |
| |
| impl io::Write for Stderr { |
| fn write(&mut self, buf: &[u8]) -> io::Result<usize> { |
| _write(libc::STDERR_FILENO, buf) |
| } |
| |
| fn flush(&mut self) -> io::Result<()> { |
| Ok(()) |
| } |
| } |
| |
| pub const STDIN_BUF_SIZE: usize = 0; |
| |
| pub fn is_ebadf(_err: &io::Error) -> bool { |
| true |
| } |
| |
| pub fn panic_output() -> Option<impl io::Write> { |
| Some(Stderr) |
| } |
| |
| fn _write(fd: i32, message: &[u8]) -> io::Result<usize> { |
| let mut iov = |
| libc::iovec { iov_base: message.as_ptr() as *mut _, iov_len: message.len() }; |
| loop { |
| // SAFETY: syscall, safe arguments. |
| let ret = unsafe { libc::writev(fd, &iov, 1) }; |
| if ret < 0 { |
| return Err(io::Error::last_os_error()); |
| } |
| let ret = ret as usize; |
| if ret > iov.iov_len { |
| return Err(io::Error::last_os_error()); |
| } |
| if ret == iov.iov_len { |
| return Ok(message.len()); |
| } |
| // SAFETY: ret has been checked to be less than the length of |
| // the buffer |
| iov.iov_base = unsafe { iov.iov_base.add(ret) }; |
| iov.iov_len -= ret; |
| } |
| } |