include "ether.m";
ether := load Ether Ether->PATH;

Eaddrlen:	con 6;

init:   fn();
parse:  fn(s: string): array of byte;
text:   fn(a: array of byte): string;
addressof:  fn(dev: string): array of byte;
eqaddr: fn(a, b: array of byte): int;

Init must be called before using any other function in the module.

Parse takes a textual representation of a MAC address in s and returns its internal representation as an array of bytes of length Eaddrlen, the form used in packets read and written via ether(3). S is a string of twelve hexadecimal digits, corresponding to the six bytes of a MAC address. Each pair of digits can optionally be separated by a colon. If s is invalid, parse returns nil.

Text takes an array of bytes of length Eaddrlen and returns its textual representation (a string of twelve hexadecimal digits). It returns <invalid> if the array is less than Eaddrlen, but it ignores any bytes beyond that.

Addressof returns the MAC address of the given Ether device dev (eg, /net/ether0), which it reads from dev/addr. It returns nil and sets the error string if that file does not exist or is invalid.

Eqaddr returns true iff a and b are the same address.

net/etherN/addr

hardware address of Ether N