//TODO failure? return 0 on success
int
remove_interval(struct pmm_interval_list *l, struct pmm_interval *i)
{
LOGPRINTF("removing interval with type: %d\n", i->type);
//if interval is at top or bottom, rewire top/bottom pointers
if(l->top == i) {
l->top = i->previous;
}
if(l->bottom == i) {
l->bottom = i->next;
}
//rewire intervals that were previous/next intervals of the remove-ee
if(i->next != NULL) {
i->next->previous = i->previous;
}
if(i->previous != NULL) {
i->previous->next = i->next;
}
//free interval
free_interval(&i);
l->size -= 1;
LOGPRINTF("size: %d\n", l->size);
return 1;
}
/*!
* Initialize an interval with parameters passed.
*
* Function maybe be used with _INFLECT and _BISECT intervals and with
* _POINT intervals if the start parameter is set to the point. May also
* be used to on initial IT_GBBP_CLIMB but not once climb_step is non-zero
*
* @param plane plane that the interval belongs to (defunct)
* @param n_p number of parameters of the interval points
* @param type interval tyle
* @param start pointer to the start parameter array
* @param end pointer to the end parameter array
*
* @return pointer to a newly allocated interval with values initialised as
* per the arguments passed
*
*/
struct pmm_interval* init_interval(int plane,
int n_p,
enum pmm_interval_type type,
int *start,
int *end)
{
struct pmm_interval *i;
i = new_interval();
i->plane = plane;
i->n_p = n_p;
i->type = type;
switch(i->type) {
case IT_GBBP_CLIMB :
case IT_GBBP_BISECT :
case IT_GBBP_INFLECT :
i->start = init_param_array_copy(start, n_p);
i->end = init_param_array_copy(end, n_p);
break;
case IT_POINT :
i->start = init_param_array_copy(start, n_p);
break;
default :
ERRPRINTF("Interval type not supported; %s\n",
interval_type_to_string(i->type));
free_interval(&i);
return NULL;
}
return i;
}
int main(void)
{
time_t start = get_current_time();
sleep(1);
time_t end = get_current_time();
Interval *interval = make_interval(start, end);
double diff = interval_duration(interval);
print_interval(interval);
free_interval(interval);
(void) printf("Elapsed time in seconds %lf\n", diff);
return EXIT_SUCCESS;
}
/*!
* frees an interval list structure and members it contains
*
* @param il pointer to address of the interval list
*/
void
free_interval_list(struct pmm_interval_list **il)
{
struct pmm_interval *this, *next;
this = (*il)->top;
while(this != NULL) {
next = this->next;
free_interval(&this);
this = next;
}
free(*il);
*il = NULL;
}
//TODO fix naming of functions so 'remove'/'delete' indicates deallocation also
//TODO fix return to -1 on failure, 0 on success
int
remove_top_interval(struct pmm_interval_list *l)
{
// remove top destructively removes the top element of the list, remember
// to read it first or it will be gone forever
struct pmm_interval *zombie;
if(isempty_interval_list(l)) {
return 0; // failure
}
else {
if(l->top == l->bottom) { /* only one element in list */
zombie = l->top;
l->top = NULL;
l->bottom = NULL;
}
else {
/* swap old top with new top */
zombie = l->top;
l->top = zombie->previous;
l->top->next=NULL;
}
free_interval(&zombie);
l->size -= 1;
return 1; // success
}
}