unit std.io;
import std.sys;

// A writer is a handle and nothing else: an integer the runtime understands.
// It stores no reference and no context pointer, so it is Copy and can be
// passed and returned freely (SPEC 5 R8).
pub enum Writer { Null, Stdout, Stderr }

pub fn write(w: Writer, bytes: []u8) -> usize {
    if w == Writer.Null { return bytes.n; }
    var handle: i32 = 1;
    if w == Writer.Stderr { handle = 2; }
    let done: i32 = sys.raw_write(handle, &bytes[0], bytes.n);
    if done < 0 { return 0; }
    return done as usize;
}

pub fn print(bytes: []u8) -> usize {
    return write(Writer.Stdout, bytes);
}

pub fn println(bytes: []u8) -> usize {
    let n: usize = write(Writer.Stdout, bytes);
    return n + write(Writer.Stdout, "\n");
}