cidr_num.c

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/*
 * Show some numbers
 */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#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;

        if(addr==NULL)
        {
                errno = EFAULT;
                return(NULL);
        }

        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;

        if(addr==NULL)
        {
                errno = EFAULT;
                return(NULL);
        }

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

        return(cidr_numhost_pflen(pflen));
}