if s == "" {
		return false
	}
	for _, c := range s {
		switch {
		case strings.ContainsRune("!#$%&()*+-./:;<=>?@[]^_{|}~ ", c):
			// Backslash and quote chars are reserved, but
			// otherwise any punctuation chars are allowed
			// in a tag name.
		case !unicode.IsLetter(c) && !unicode.IsDigit(c):
			return false
		}
	}
	return true
}

// unicode width of the text.
func (b *Writer) endEscape() {
	switch b.endChar {
	case Escape:
		b.updateWidth()
		if b.flags&StripEscape == 0 {
			b.cell.width -= 2 // don't count the Escape chars
		}
	case '>': // tag of zero width
	case ';':
		b.cell.width++ // entity, count as one rune
	}
	b.pos = len(b.buf)
	b.endChar = 0
}

// of an input buffer of length n.
func (enc *Encoding) EncodedLen(n int) int {
	if enc.padChar == NoPadding {
		return n/3*4 + (n%3*8+5)/6 // minimum # chars at 6 bits per char
	}
	return (n + 2) / 3 * 4 // minimum # 4-char quanta, 3 bytes each
}

/*
 * Decoder
 */

type CorruptInputError int64

func (e CorruptInputError) Error() string {

	// Re-using some addrParser methods which support obsolete text, i.e. non-printable ASCII
	p := addrParser{date, nil}
	p.skipSpace()

	// RFC 5322: zone = (FWS ( "+" / "-" ) 4DIGIT) / obs-zone
	// zone length is always 5 chars unless obsolete (obs-zone)
	if ind := strings.IndexAny(p.s, "+-"); ind != -1 && len(p.s) >= ind+5 {
		date = p.s[:ind+5]
		p.s = p.s[ind+5:]
	} else {
		ind := strings.Index(p.s, "T")
		if ind == 0 {

			if id.Name == name {
				return id
			}
		}
	}
	return nil
}

var (
	noteMarker    = `([A-Z][A-Z]+)\(([^)]+)\):?`                // MARKER(uid), MARKER at least 2 chars, uid at least 1 char
	noteMarkerRx  = lazyregexp.New(`^[ \t]*` + noteMarker)      // MARKER(uid) at text start
	noteCommentRx = lazyregexp.New(`^/[/*][ \t]*` + noteMarker) // MARKER(uid) at comment start
)

		},
		// Invalid ASCII in date.
		{
			"Fri, 21 Nov 1997 ù 09:55:06 -0600    \r\n (thisisa(valid)cfws)   \t ",
			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
			false,
		},
		// CFWS chars () in date.
		{
			"Fri, 21 Nov () 1997 09:55:06 -0600    \r\n (thisisa(valid)cfws)   \t ",
			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
			false,
		},

				break
			}
		}
	}
	c.size += len(p)
	return len(p), nil
}

// nodeSize determines the size of n in chars after formatting.
// The result is <= maxSize if the node fits on one line with at
// most maxSize chars and the formatted output doesn't contain
// any control chars. Otherwise, the result is > maxSize.
func (p *printer) nodeSize(n ast.Node, maxSize int) (size int) {

//		reference relative to SB.
//
//	$<floating point literal>
//		Floating point constant value.
//		Encoding:
//			type = TYPE_FCONST
//			val = floating point value
//
//	$<string literal, up to 8 chars>
//		String literal value (raw bytes used for DATA instruction).
//		Encoding:
//			type = TYPE_SCONST
//			val = string
//
//	<symbolic constant name>

// sa[i] is either 0, the ID for the LMS-substring at index 2*i,
// or the ID for the LMS-substring at index 2*i+1.
// To produce the subproblem we need only remove the zeros
// and change ID into ID-1 (our IDs start at 1, but text chars start at 0).
//
// map_32 packs the result, which is the input to the recursion,
// into the top of sa, so that the recursion result can be stored
// in the bottom of sa, which sets up for expand_8_32 well.

func CertGetNameString(certContext *CertContext, nameType uint32, flags uint32, typePara unsafe.Pointer, name *uint16, size uint32) (chars uint32) {
	r0, _, _ := syscall.Syscall6(procCertGetNameStringW.Addr(), 6, uintptr(unsafe.Pointer(certContext)), uintptr(nameType), uintptr(flags), uintptr(typePara), uintptr(unsafe.Pointer(name)), uintptr(size))
	chars = uint32(r0)
	return
}