Function xo_escape_sdparams

tools/libxo/libxo/libxo.c:844–878

* PARAM-VALUE = UTF-8-STRING ; characters '"', '\' and * ; ']' MUST be escaped. */

 *                                ; ']' MUST be escaped.
 */
static ssize_t
xo_escape_sdparams (xo_buffer_t *xbp, ssize_t len, xo_xff_flags_t flags UNUSED)
{
    ssize_t delta = 0;
    char *cp, *ep, *ip;

    for (cp = xbp->xb_curp, ep = cp + len; cp < ep; cp++) {
	if (*cp == '\\' || *cp == '"' || *cp == ']')
	    delta += 1;
    }

    if (delta == 0)		/* Nothing to escape; bail */
	return len;

    if (!xo_buf_has_room(xbp, delta)) /* No room; bail, but don't append */
	return 0;

    ep = xbp->xb_curp;
    cp = ep + len;
    ip = cp + delta;
    do {
	cp -= 1;
	ip -= 1;

	if (*cp == '\\' || *cp == '"' || *cp == ']') {
	    *ip-- = *cp;
	    *ip = '\\';
	} else {
	    *ip = *cp;
	}
	
    } while (cp > ep && cp != ip);

    return len + delta;
}

static void
xo_buf_escape (xo_handle_t *xop, xo_buffer_t *xbp,