1/*	$NetBSD: inet_neta.c,v 1.15 2002/11/11 18:02:37 thorpej Exp $	*/
2
3/*
4 * Copyright (c) 1996 by Internet Software Consortium.
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
11 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
12 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
13 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
14 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
15 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
16 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
17 * SOFTWARE.
18 */
19
20#include <sys/cdefs.h>
21#if defined(LIBC_SCCS) && !defined(lint)
22#if 0
23static const char rcsid[] = "Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp ";
24#else
25__RCSID("$NetBSD: inet_neta.c,v 1.15 2002/11/11 18:02:37 thorpej Exp $");
26#endif
27#endif
28
29#include "namespace.h"
30#include <sys/types.h>
31#include <sys/socket.h>
32#include <netinet/in.h>
33#include <arpa/inet.h>
34
35#include <assert.h>
36#include <errno.h>
37#include <stdio.h>
38#include <string.h>
39
40#ifdef __weak_alias
41__weak_alias(inet_neta,_inet_neta)
42#endif
43
44/*
45 * char *
46 * inet_neta(src, dst, size)
47 *	format a u_long network number into presentation format.
48 * return:
49 *	pointer to dst, or NULL if an error occurred (check errno).
50 * note:
51 *	format of ``src'' is as for inet_network().
52 * author:
53 *	Paul Vixie (ISC), July 1996
54 */
55char *
56inet_neta(src, dst, size)
57	u_long src;
58	char *dst;
59	size_t size;
60{
61	char *odst = dst;
62	char *ep;
63	int advance;
64
65	_DIAGASSERT(dst != NULL);
66
67	if (src == 0x00000000) {
68		if (size < sizeof "0.0.0.0")
69			goto emsgsize;
70		strlcpy(dst, "0.0.0.0", size);
71		return dst;
72	}
73	ep = dst + size;
74	if (ep <= dst)
75		goto emsgsize;
76	while (src & 0xffffffff) {
77		u_char b = (u_char)((src & 0xff000000) >> 24);
78
79		src <<= 8;
80		if (b || src) {
81			advance = snprintf(dst, (size_t)(ep - dst), "%u", b);
82			if (advance <= 0 || advance >= ep - dst)
83				goto emsgsize;
84			dst += advance;
85			if (src != 0L) {
86				if (dst + 1 >= ep)
87					goto emsgsize;
88				*dst++ = '.';
89				*dst = '\0';
90			}
91		}
92	}
93	return (odst);
94
95 emsgsize:
96	errno = EMSGSIZE;
97	return (NULL);
98}
99