/*      $NetBSD: inet_neta.c,v 1.3 2012/06/25 22:32:44 abs Exp $        */

/*
* 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.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static const char rcsid[] = "Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp ";
#else
__RCSID("$NetBSD: inet_neta.c,v 1.3 2012/06/25 22:32:44 abs Exp $");
#endif
#endif

#include "namespace.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

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

#ifdef __weak_alias
__weak_alias(inet_neta,_inet_neta)
#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(u_long src, char *dst, size_t size)
{
       char *odst = dst;
       char *ep;
       int advance;

       _DIAGASSERT(dst != NULL);

       if (src == 0x00000000) {
               if (size < sizeof "0.0.0.0")
                       goto emsgsize;
               strlcpy(dst, "0.0.0.0", size);
               return dst;
       }
       ep = dst + size;
       if (ep <= dst)
               goto emsgsize;
       while (src & 0xffffffffUL) {
               u_char b = (u_char)((src & 0xff000000UL) >> 24);

               src <<= 8;
               if (b || src) {
                       advance = snprintf(dst, (size_t)(ep - dst), "%u", b);
                       if (advance <= 0 || advance >= ep - dst)
                               goto emsgsize;
                       dst += advance;
                       if (src != 0L) {
                               if (dst + 1 >= ep)
                                       goto emsgsize;
                               *dst++ = '.';
                               *dst = '\0';
                       }
               }
       }
       return (odst);

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