const (
	lowerhex = "0123456789abcdef"
	upperhex = "0123456789ABCDEF"
)

// contains reports whether the string contains the byte c.
func contains(s string, c byte) bool {
	return index(s, c) != -1
}

func quoteWith(s string, quote byte, ASCIIonly, graphicOnly bool) string {
	return string(appendQuotedWith(make([]byte, 0, 3*len(s)/2), s, quote, ASCIIonly, graphicOnly))
}