/*
* Check that list has room for one more element.
*/
void
growlist(List *l)
{
if(l->listptr==0 || l->nalloc==0){
l->nalloc = INCR;
l->listptr = emalloc(INCR*sizeof(long));
l->nused = 0;
}else if(l->nused == l->nalloc){
l->listptr = erealloc(l->listptr, (l->nalloc+INCR)*sizeof(long));
memset(l->longptr+l->nalloc, 0, INCR*sizeof(long));
l->nalloc += INCR;
}
}
/*
* Remove the ith element from the list
*/
void
dellist(List *l, int i)
{
memmove(&l->longptr[i], &l->longptr[i+1], (l->nused-(i+1))*sizeof(long));
l->nused--;
}
/*
* Add a new element, whose position is i, to the list
*/
void
inslist(List *l, int i, long val)
{
growlist(l);
memmove(&l->longptr[i+1], &l->longptr[i], (l->nused-i)*sizeof(long));
l->longptr[i] = val;
l->nused++;
}
