pub fn memcpy(dst: &mut [u8], src: &[u8]) -> Result<(), RangeError>Expand description
This mimics libc::memcpy(), same as dst = src.
The memcpy() function copies src.len() bytes from the src to the dst.
The src and the dst must not overlape.
This function return Err(RangeError) if dst.len() < src.len(), otherwise return Ok(())