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/* $OpenBSD: inet_neta.c,v 1.7 2005/08/06 20:30:03 espie 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/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
/*
* char *
* inet_neta(src, dst, size)
* format an in_addr_t 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(in_addr_t src, char *dst, size_t size)
{
char *odst = dst;
char *ep;
int advance;
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 & 0xffffffff) {
u_char b = (src & 0xff000000) >> 24;
src <<= 8;
if (b || src) {
if (ep - dst < sizeof "255.")
goto emsgsize;
advance = snprintf(dst, 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);
}
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