CTLBACKQ
else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
case CTLBACKQ:
case CTLBACKQ|CTLQUOTE: {
case CTLBACKQ: /* does not happen at all */
case CTLBACKQ | CTLQUOTE:
case CTLBACKQ:
case CTLBACKQ+CTLQUOTE:
STPUTC(CTLBACKQ | CTLQUOTE, out);
STPUTC(CTLBACKQ, out);
case CTLBACKQ: c = 'q'; goto backslash;
case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
case CTLBACKQ|CTLQUOTE:
case CTLBACKQ:
if (!quoted && *p == (CTLBACKQ|CTLQUOTE))