int compare_route_entries(const void *a, const void *b)
{
const struct route_table_entry *entry_a = (const struct route_table_entry *)a;
const struct route_table_entry *entry_b = (const struct route_table_entry *)b;
if (entry_a->prefix == entry_b->prefix)
{
if (entry_a->mask == entry_b->mask)
{
return 0;
}
else
{
if (entry_a->mask > entry_b->mask)
return 1;
else
return -1;
}
}
else
{
if (entry_a->prefix > entry_b->prefix)
return 1;
else
return -1;
}
}
struct route_table_entry *best_route(struct route_table_entry *route_table, int rt_len, uint32_t ip)
{
int left = 0, right = rt_len - 1;
struct route_table_entry *best = NULL;
while (left <= right)
{
int mid = left + (right - left) / 2;
struct route_table_entry *rt = &route;_table[mid];
if ((rt->mask & ip) == (rt->mask & rt->prefix))
{
if (best == NULL || rt->mask > best->mask)
{
best = rt;
}
left = mid + 1;
}
else
{
right = mid - 1;
}
}
return best;
}
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