END_OF_CHAIN
if (ch_bufhead != END_OF_CHAIN) {
if (ch_buftail == END_OF_CHAIN ||
if (firstbn == END_OF_CHAIN)
while (ch_bufhead != END_OF_CHAIN) {
thisfile->buflist.next = thisfile->buflist.prev = END_OF_CHAIN;
for ((bn) = ch_bufhead; (bn) != END_OF_CHAIN; (bn) = (bn)->next)
(bn)->prev = END_OF_CHAIN; \
(bn)->next = END_OF_CHAIN; \