src/cidr/cidr_num.c

/*
 * Show some numbers
 */
#include "config.h"

#include <errno.h>
#include <string.h>

#include "cidr.h"
#include "cidr_pow2_p.h"

/* Number of total addresses in a given prefix length */
const char *cidr_numaddr_pflen(int pflen)
{

	if (pflen < 0 || pflen > 128) {
		errno = EINVAL;
		return (NULL);
	}
	return (__cidr_pow2[128 - pflen]);
}

/* Addresses in a CIDR block */
const char *cidr_numaddr(const CIDR * addr)
{
	int pflen;

	pflen = cidr_get_pflen(addr);
	if (addr->proto == CIDR_IPV4)
		pflen += 96;

	return (cidr_numaddr_pflen(pflen));
}

/* Hosts in a prefix length */
const char *cidr_numhost_pflen(int pflen)
{

	if (pflen < 0 || pflen > 128) {
		errno = EINVAL;
		return (NULL);
	}
	return (__cidr_pow2m2[128 - pflen]);
}

/* Addresses in a CIDR block */
const char *cidr_numhost(const CIDR * addr)
{
	int pflen;

	pflen = cidr_get_pflen(addr);
	if (addr->proto == CIDR_IPV4)
		pflen += 96;

	return (cidr_numhost_pflen(pflen));
}