Macro wlan_frame_writer::write_frame_with_fixed_slice

write_frame_with_fixed_slice!() { /* proc-macro */ }

Writes a frame into a fixed sized slice.

This macro writes the frame into the fixed sized buffer in the first argument and returns a Result<(usize, usize), Error> where the values in the returned tuple are the beginning and ending indices of the frame, respectively.

The second argument of this macro is the specification of the frame defined in the documentation for write_frame with the addition of an optional fill_zeroes field.

Fill with zeroes

The caller may optionally specify fill_zeroes: () at the beginning of the frame specification. The effect is that the frame will be written so that the end of the frame ends at the end of the buffer. The beginning of the buffer will be filled with zeroes up to the start of the frame. For example,

let buffer = [0u8; 10];
let (frame_start, frame_end) = write_frame_with_fixed_slice!(&mut buffer[..], {
    fill_zeroes: (),
    ies: { ssid: &b"foobar"[..] },
});
assert_eq!(&[0, 6, 102, 111, 111, 98, 97, 114, 0, 0][..], &buffer[frame_start..frame_end]);