key_event_t
key_limit_update (key_limit_t key)
{
#ifdef NO_64BIT_MATH
if (low32(key->num_left) == 0) {
// carry
key->num_left = make64(high32(key->num_left) - 1, low32(key->num_left) - 1);
}else {
// no carry
key->num_left = make64(high32(key->num_left), low32(key->num_left) - 1);
}
if (high32(key->num_left) != 0 || low32(key->num_left) >= soft_limit) {
return key_event_normal; /* we're above the soft limit */
}
#else
key->num_left--;
if (key->num_left >= soft_limit) {
return key_event_normal; /* we're above the soft limit */
}
#endif
if (key->state == key_state_normal) {
/* we just passed the soft limit, so change the state */
key->state = key_state_past_soft_limit;
}
#ifdef NO_64BIT_MATH
if (low32(key->num_left) == 0 && high32(key->num_left == 0))
#else
if (key->num_left < 1)
#endif
{ /* we just hit the hard limit */
key->state = key_state_expired;
return key_event_hard_limit;
}
return key_event_soft_limit;
}
void
index_advance(xtd_seq_num_t *pi, sequence_number_t s) {
#ifdef NO_64BIT_MATH
/* a > ~b means a+b will generate a carry */
/* s is uint16 here */
*pi = make64(high32(*pi) + (s > ~low32(*pi) ? 1 : 0),low32(*pi) + s);
#else
*pi += s;
#endif
}
err_status_t key_limit_set(key_limit_t key, const xtd_seq_num_t s) {
#ifdef NO_64BIT_MATH
if (high32(s) == 0 && low32(s) < soft_limit)
return err_status_bad_param;
#else
if (s < soft_limit)
return err_status_bad_param;
#endif
key->num_left = s;
key->state = key_state_normal;
return err_status_ok;
}
