fn next()

in sgx_tstd/src/sys/fs.rs [207:235]

• 28 lines of code
• 8 McCabe index (conditional complexity)

    fn next(&mut self) -> Option<io::Result<DirEntry>> {
        if self.end_of_stream {
            return None;
        }

        unsafe {
            let mut ret = DirEntry { entry: mem::zeroed(), dir: Arc::clone(&self.inner) };
            let mut entry_ptr = ptr::null_mut();
            loop {
                let err = libc::readdir64_r(self.inner.dirp.0, &mut ret.entry, &mut entry_ptr);
                if err != 0 {
                    if entry_ptr.is_null() {
                        // We encountered an error (which will be returned in this iteration), but
                        // we also reached the end of the directory stream. The `end_of_stream`
                        // flag is enabled to make sure that we return `None` in the next iteration
                        // (instead of looping forever)
                        self.end_of_stream = true;
                    }
                    return Some(Err(Error::from_raw_os_error(err)));
                }
                if entry_ptr.is_null() {
                    return None;
                }
                if ret.name_bytes() != b"." && ret.name_bytes() != b".." {
                    return Some(Ok(ret));
                }
            }
        }
    }