157         let mut cnt = 0;  in read_stdin()  localVariable
158         while cnt < buf.len() {  in read_stdin()
167                             return Ok(cnt);  in read_stdin()
174                 buf[cnt] = x;  in read_stdin()
175                 cnt += 1;  in read_stdin()
178                     return Ok(cnt);  in read_stdin()
182         return Ok(cnt);  in read_stdin()
200         let mut cnt = 0;  in write_stdin()  localVariable
201         while cnt < buf.len() {  in write_stdin()
210                             return Err(TtyError::BufferFull(cnt));  in write_stdin()
216                 *r.unwrap() = buf[cnt];  in write_stdin()
217                 cnt += 1;  in write_stdin()
221         return Ok(cnt);  in write_stdin()
232         let mut cnt = 0;  in read_output()  localVariable
233         while cnt < buf.len() {  in read_output()
242                             return Ok(cnt);  in read_output()
248                 buf[cnt] = *val.unwrap();  in read_output()
249                 cnt += 1;  in read_output()
252         return Ok(cnt);  in read_output()
265         let mut cnt = 0;  in write_output()  localVariable
266         while cnt < buf.len() {  in write_output()
275                             return Err(TtyError::BufferFull(cnt));  in write_output()
281                 *r.unwrap() = buf[cnt];  in write_output()
282                 cnt += 1;  in write_output()
286         return Ok(cnt);  in write_output()