/*      $NetBSD: inet_neta.c,v 1.1.1.2 2012/09/09 16:07:50 christos Exp $       */

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996,1999 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 ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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 rcsid[] = "Id: inet_neta.c,v 1.3 2005/04/27 04:56:20 sra Exp ";
#endif

#include "port_before.h"

#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 "port_after.h"

#ifdef SPRINTF_CHAR
# define SPRINTF(x) strlen(sprintf/**/x)
#else
# define SPRINTF(x) ((size_t)sprintf x)
#endif

/*%
* char *
* inet_neta(src, dst, size)
*      format a u_long network number into presentation format.
* return:
*      pointer to dst, or NULL if an error occurred (check errno).
* note:
*      format of ``src'' is as for inet_network().
* author:
*      Paul Vixie (ISC), July 1996
*/
char *
inet_neta(src, dst, size)
       u_long src;
       char *dst;
       size_t size;
{
       char *odst = dst;
       char *tp;

       while (src & 0xffffffff) {
               u_char b = (src & 0xff000000) >> 24;

               src <<= 8;
               if (b) {
                       if (size < sizeof "255.")
                               goto emsgsize;
                       tp = dst;
                       dst += SPRINTF((dst, "%u", b));
                       if (src != 0L) {
                               *dst++ = '.';
                               *dst = '\0';
                       }
                       size -= (size_t)(dst - tp);
               }
       }
       if (dst == odst) {
               if (size < sizeof "0.0.0.0")
                       goto emsgsize;
               strcpy(dst, "0.0.0.0");
       }
       return (odst);

emsgsize:
       errno = EMSGSIZE;
       return (NULL);
}

/*! \file */