1/*-
2 * SPDX-License-Identifier: ISC
3 *
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1996,1999 by Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#if defined(LIBC_SCCS) && !defined(lint)
21static const char rcsid[] = "$Id: inet_neta.c,v 1.3 2005/04/27 04:56:20 sra Exp $";
22#endif
23#include <sys/cdefs.h>
24__FBSDID("$FreeBSD$");
25
26#include "port_before.h"
27
28#include <sys/types.h>
29#include <sys/socket.h>
30#include <netinet/in.h>
31#include <arpa/inet.h>
32
33#include <errno.h>
34#include <stdio.h>
35#include <string.h>
36
37#include "port_after.h"
38
39#ifdef SPRINTF_CHAR
40# define SPRINTF(x) strlen(sprintf/**/x)
41#else
42# define SPRINTF(x) ((size_t)sprintf x)
43#endif
44
45/*%
46 * char *
47 * inet_neta(src, dst, size)
48 *	format an in_addr_t network number into presentation format.
49 * return:
50 *	pointer to dst, or NULL if an error occurred (check errno).
51 * note:
52 *	format of ``src'' is as for inet_network().
53 * author:
54 *	Paul Vixie (ISC), July 1996
55 */
56char *
57inet_neta(in_addr_t src, char *dst, size_t size)
58{
59	char *odst = dst;
60	char *tp;
61
62	while (src & 0xffffffff) {
63		u_char b = (src & 0xff000000) >> 24;
64
65		src <<= 8;
66		if (b) {
67			if (size < sizeof "255.")
68				goto emsgsize;
69			tp = dst;
70			dst += SPRINTF((dst, "%u", b));
71			if (src != 0L) {
72				*dst++ = '.';
73				*dst = '\0';
74			}
75			size -= (size_t)(dst - tp);
76		}
77	}
78	if (dst == odst) {
79		if (size < sizeof "0.0.0.0")
80			goto emsgsize;
81		strcpy(dst, "0.0.0.0");
82	}
83	return (odst);
84
85 emsgsize:
86	errno = EMSGSIZE;
87	return (NULL);
88}
89
90/*
91 * Weak aliases for applications that use certain private entry points,
92 * and fail to include <arpa/inet.h>.
93 */
94#undef inet_neta
95__weak_reference(__inet_neta, inet_neta);
96
97/*! \file */
98