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/*

 * Copyright (c) 1996 by Internet Software Consortium.

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS

 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE

 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL

 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR

 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

 * SOFTWARE.

 */

#if defined(LIBC_SCCS) && !defined(lint)

static const char orig_rcsid[] = "From Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp";

static const char rcsid[] = "inet_net_ntop.c,v 1.1 1998/08/19 21:32:13 joel Exp";

#endif

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <errno.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#ifdef SPRINTF_CHAR

# define SPRINTF(x) strlen(sprintf/**/x)

#else

# define SPRINTF(x) ((size_t)sprintf x)

#endif

static char *   inet_net_ntop_ipv4 __P((const u_char *src, int bits,

                                        char *dst, size_t size));

/*

 * char *

 * inet_net_ntop(af, src, bits, dst, size)

 *      convert network number from network to presentation format.

 *      generates CIDR style result always.

 * return:

 *      pointer to dst, or NULL if an error occurred (check errno).

 * author:

 *      Paul Vixie (ISC), July 1996

 */

char *

inet_net_ntop(af, src, bits, dst, size)

        int af;

        const void *src;

        int bits;

        char *dst;

        size_t size;

{

        switch (af) {

        case AF_INET:

                return (inet_net_ntop_ipv4(src, bits, dst, size));

        default:

                errno = EAFNOSUPPORT;

                return (NULL);

        }

}

/*

 * static char *

 * inet_net_ntop_ipv4(src, bits, dst, size)

 *      convert IPv4 network number from network to presentation format.

 *      generates CIDR style result always.

 * return:

 *      pointer to dst, or NULL if an error occurred (check errno).

 * note:

 *      network byte order assumed.  this means 192.5.5.240/28 has

 *      0x11110000 in its fourth octet.

 * author:

 *      Paul Vixie (ISC), July 1996

 */

static char *

inet_net_ntop_ipv4(src, bits, dst, size)

        const u_char *src;

        int bits;

        char *dst;

        size_t size;

{

        char *odst = dst;

        char *t;

        u_int m;

        int b;

        if (bits < 0 || bits > 32) {

                errno = EINVAL;

                return (NULL);

        }

        if (bits == 0) {

                if (size < sizeof "0")

                        goto emsgsize;

                *dst++ = '0';

                *dst = '\0';

        }

        /* Format whole octets. */

        for (b = bits / 8; b > 0; b--) {

                if (size < sizeof "255.")

                        goto emsgsize;

                t = dst;

                dst += SPRINTF((dst, "%u", *src++));

                if (b > 1) {

                        *dst++ = '.';

                        *dst = '\0';

                }

                size -= (size_t)(dst - t);

        }

        /* Format partial octet. */

        b = bits % 8;

        if (b > 0) {

                if (size < sizeof ".255")

                        goto emsgsize;

                t = dst;

                if (dst != odst)

                        *dst++ = '.';

                m = ((1 << b) - 1) << (8 - b);

                dst += SPRINTF((dst, "%u", *src & m));

                size -= (size_t)(dst - t);

        }

        /* Format CIDR /width. */

        if (size < sizeof "/32")

                goto emsgsize;

        dst += SPRINTF((dst, "/%u", bits));

        return (odst);

 emsgsize:

        errno = EMSGSIZE;

        return (NULL);

}