// io — stream interface (Plan 9 Bio / Hare io::stream shape).
//
// No closures, no methods. A `stream` is a struct of function
// pointers plus a `ctx: *void`. The error channel is the return
// value of read/write/close. Negative i32 = errno-style code,
// non-negative = bytes transferred.

type stream = struct {
	ctx:    *void,
	read:   fn(s: *stream, buf: []u8) i32,
	write:  fn(s: *stream, buf: []u8) i32,
	close:  fn(s: *stream) i32,
};

def eof:    i32 = -1;
def closed: i32 = -2;

export fn read(s: *stream, buf: []u8) i32 = {
	return s.read(s, buf);
};

export fn write(s: *stream, buf: []u8) i32 = {
	return s.write(s, buf);
};

export fn close(s: *stream) i32 = {
	return s.close(s);
};