78     pub fn check_rw_param(&self, len: usize, buf: &[u8]) -> Result<(), SystemError> {  in check_rw_param()
79         if len > buf.len() {  in check_rw_param()
86     pub fn input(&self, buf: &[u8]) -> Result<usize, SystemError> {  in input()
87         let r: Result<usize, TtyError> = self.core.input(buf, false);  in input()
146         buf: &mut [u8],  in read_at()
156         self.check_rw_param(len, buf)?;  in read_at()
159         let r: Result<usize, TtyError> = self.core.read_stdin(&mut buf[0..len], true);  in read_at()
180         buf: &[u8],  in write_at()
191         self.check_rw_param(len, buf)?;  in write_at()
195             self.core.stdout(&buf[0..len], true)  in write_at()
197             self.core.stderr(&buf[0..len], true)  in write_at()
241             let mut buf = [0u8; 512];  in sync()  localVariable
242             let r: Result<usize, TtyError> = self.core.output(&mut buf[0..511], false);  in sync()
259                 for x in buf {  in sync()