static int
add_border_sentinel( void )
{
struct border_change_t *sentinel = alloc_change();
sentinel->x = sentinel->y = 0;
sentinel->colour = scld_last_dec.name.hires ?
display_hires_border : display_lores_border;
return 0;
}
void end_change_chain(void)
{
if (change_barrier) {
/* There were no changes in this change chain. */
free(change_barrier);
change_barrier = NULL;
} else {
/* There were some changes. Add end of chain marker. */
add_change(alloc_change());
}
}
void begin_change_chain(void)
{
BUG_ON(change_barrier);
/*
* Allocate change chain barrier but add it to the change tree only if
* there will be any real changes
*/
change_barrier = alloc_change();
change_merge = CHANGE_MERGE_NONE;
}
static struct change *new_change(void)
{
struct change *change;
if (change_barrier) {
/*
* We are recording series of changes (:replace for example)
* and now we have just made the first change so we have to
* mark beginning of the chain.
*
* We could have done this before when starting the change
* chain but then we may have ended up with an empty chain.
* We don't want to record empty changes ever.
*/
add_change(change_barrier);
change_barrier = NULL;
}
change = alloc_change();
add_change(change);
return change;
}