lookupHosts

fn lookupHosts(
    t: *Threaded,
    host_name: HostName,
    resolved: *Io.Queue(HostName.LookupResult),
    options: HostName.LookupOptions,
) !void {
    const path_w = if (is_windows) path_w: {
        var path_w_buf: [windows.PATH_MAX_WIDE:0]u16 = undefined;
        const system_dir = windows.getSystemDirectoryWtf16Le();
        const suffix = [_]u16{
            '\\', 'd', 'r', 'i', 'v', 'e', 'r', 's', '\\', 'e', 't', 'c', '\\', 'h', 'o', 's', 't', 's',
        };
        @memcpy(path_w_buf[0..system_dir.len], system_dir);
        @memcpy(path_w_buf[system_dir.len..][0..suffix.len], &suffix);
        path_w_buf[system_dir.len + suffix.len] = 0;
        break :path_w wToPrefixedFileW(null, &path_w_buf, .{}) catch |err| switch (err) {
            error.FileNotFound,
            error.AccessDenied,
            => return error.UnknownHostName,

            error.Canceled => |e| return e,

            else => {
                // Here we could add more detailed diagnostics to the results queue.
                return error.DetectingNetworkConfigurationFailed;
            },
        };
    };
    const file = (if (is_windows)
        dirOpenFileWtf16(null, path_w.span(), .{})
    else
        dirOpenFile(t, .cwd(), "/etc/hosts", .{})) catch |err| switch (err) {
        error.FileNotFound,
        error.NotDir,
        error.AccessDenied,
        => return error.UnknownHostName,

        error.Canceled => |e| return e,

        else => {
            // Here we could add more detailed diagnostics to the results queue.
            return error.DetectingNetworkConfigurationFailed;
        },
    };
    defer fileClose(t, &.{file});

    var line_buf: [512]u8 = undefined;
    var file_reader = file.reader(t.io(), &line_buf);
    return t.lookupHostsReader(host_name, resolved, options, &file_reader.interface) catch |err| switch (err) {
        error.ReadFailed => switch (file_reader.err.?) {
            error.Canceled => |e| return e,
            else => {
                // Here we could add more detailed diagnostics to the results queue.
                return error.DetectingNetworkConfigurationFailed;
            },
        },
        error.Canceled,
        error.Closed,
        error.UnknownHostName,
        => |e| return e,
    };
}