}
	if len(lines) == 0 {
		return 0, UnknownNetworkError(name)
	}
	f := getFields(lines[0])
	if len(f) < 2 {
		return 0, UnknownNetworkError(name)
	}
	s := f[1]
	if n, _, ok := dtoi(s[bytealg.IndexByteString(s, '=')+1:]); ok {
		return n, nil
	}
	return 0, UnknownNetworkError(name)
}

func (*Resolver) lookupHost(ctx context.Context, host string) (addrs []string, err error) {

	offset := 0
	ptr := unsafe.Pointer(s)
	// IndexByteString uses wide reads, so we need to be careful
	// with page boundaries. Call IndexByteString on
	// [ptr, endOfPage) interval.
	safeLen := int(pageSize - uintptr(ptr)%pageSize)

	for {
		t := *(*string)(unsafe.Pointer(&stringStruct{ptr, safeLen}))
		// Check one page at a time.
		if i := bytealg.IndexByteString(t, 0); i != -1 {
			return offset + i
		}

	// Do it by finding the parens.
	i := bytealg.IndexByteString(name, '(')
	if i < 0 {
		throw("panicwrap: no ( in " + name)
	}
	pkg := name[:i-1]
	if i+2 >= len(name) || name[i-1:i+2] != ".(*" {
		throw("panicwrap: unexpected string after package name: " + name)
	}
	name = name[i+2:]
	i = bytealg.IndexByteString(name, ')')
	if i < 0 {
		throw("panicwrap: no ) in " + name)
	}

		// Given a choice, we prefer the cgo resolver.
		return hostLookupCgo, nil
	} else {
		// Neither resolver was explicitly requested
		// and we have no preference.

		if bytealg.IndexByteString(hostname, '\\') != -1 || bytealg.IndexByteString(hostname, '%') != -1 {
			// Don't deal with special form hostnames
			// with backslashes or '%'.
			return hostLookupCgo, nil
		}

		// If something is unrecognized, use cgo.

func parsegodebug(godebug string, seen map[string]bool) {
	for p := godebug; p != ""; {
		var field string
		if seen == nil {
			// startup: process left to right, overwriting older settings with newer
			i := bytealg.IndexByteString(p, ',')
			if i < 0 {
				field, p = p, ""
			} else {
				field, p = p[:i], p[i+1:]
			}
		} else {
			// incremental update: process right to left, updating and skipping seen
			i := len(p) - 1

func createEnvBlock(envv []string) ([]uint16, error) {
	if len(envv) == 0 {
		return utf16.Encode([]rune("\x00\x00")), nil
	}
	var length int
	for _, s := range envv {
		if bytealg.IndexByteString(s, 0) != -1 {
			return nil, EINVAL
		}
		length += len(s) + 1
	}
	length += 1

	b := make([]uint16, 0, length)
	for _, s := range envv {
		for _, c := range s {
			b = utf16.AppendRune(b, c)

	// of the string, but trying to handle it inline makes a bunch of
	// other inner loop conditionals more expensive, and it ends up
	// being slower.
	zone := ""
	i := bytealg.IndexByteString(s, '%')
	if i != -1 {
		s, zone = s[:i], s[i+1:]
		if zone == "" {
			// Not allowed to have an empty zone if explicitly specified.
			return Addr{}, parseAddrError{in: in, msg: "zone must be a non-empty string"}