#include "ip4.h"

#include <string.h>

#include <stdlib.h>

#include "alloc.h"

#include <stdio.h>

#include <unistd.h>

#define FULL_MASK 4294967295

int ip4_deaggregate2 (unsigned int hostmin, unsigned int hostmax, ip4_cidr_t **subnets,unsigned int *slen)

{

unsigned int step;

unsigned int mask = 0;

unsigned int i = 0;

unsigned int base = hostmin;

while (base <= hostmax) {

step = 32;

while ( (base | ( 1 << step)) != base) {

if ((base | (((~0) & FULL_MASK) >> (31-step))) > hostmax) break;

step++;

}

mask = 32 - step;

if (*slen == 0) {

*subnets = (ip4_cidr_t *)alloc(sizeof(ip4_cidr_t));

if (!*subnets) return -1;

(*subnets)[0].subnet = 0;

(*subnets)[0].mask = 0;

} else {

if (alloc_re(subnets, (*slen)*sizeof(ip4_cidr_t), ((*slen) + 1)*sizeof(ip4_cidr_t)) == 0) return -1;

}

(*subnets)[*slen].subnet = base;

(*subnets)[*slen].mask = mask;

base += 1 << step;

(*slen)++;

}

return 1;

}

int ip4_deaggregate (unsigned int hostmin, unsigned int hostmax, ip4_cidr_t **subnets,unsigned int *slen)

{

unsigned int step;

unsigned int mask = 0;

unsigned int i = 0;

unsigned int base = hostmin;

while (base <= hostmax) {

step = 0;

while ( (base | ( 1 << step)) != base) {

if ((base | (((~0) & FULL_MASK) >> (31-step))) > hostmax) break;

step++;

}

mask = 32 - step;

if (*slen == 0) {

*subnets = (ip4_cidr_t *)alloc(sizeof(ip4_cidr_t));

if (!*subnets) return -1;

(*subnets)[0].subnet = 0;

(*subnets)[0].mask = 0;

} else {

if (alloc_re(subnets, (*slen)*sizeof(ip4_cidr_t), ((*slen) + 1)*sizeof(ip4_cidr_t)) == 0) return -1;

}

(*subnets)[*slen].subnet = base;

(*subnets)[*slen].mask = mask;

base += 1 << step;

(*slen)++;

}

return 1;

}