inet_neta.c revision 302408 
1/*
2 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (c) 1996,1999 by Internet Software Consortium.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
15 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static const char rcsid[] = "$Id: inet_neta.c,v 1.3 2005/04/27 04:56:20 sra Exp $";
20#endif
21#include <sys/cdefs.h>
22__FBSDID("$FreeBSD: stable/11/lib/libc/inet/inet_neta.c 288038 2015-09-20 20:50:56Z rodrigc $");
23
24#include "port_before.h"
25
26#include <sys/types.h>
27#include <sys/socket.h>
28#include <netinet/in.h>
29#include <arpa/inet.h>
30
31#include <errno.h>
32#include <stdio.h>
33#include <string.h>
34
35#include "port_after.h"
36
37#ifdef SPRINTF_CHAR
38# define SPRINTF(x) strlen(sprintf/**/x)
39#else
40# define SPRINTF(x) ((size_t)sprintf x)
41#endif
42
43/*%
44 * char *
45 * inet_neta(src, dst, size)
46 *	format an in_addr_t network number into presentation format.
47 * return:
48 *	pointer to dst, or NULL if an error occurred (check errno).
49 * note:
50 *	format of ``src'' is as for inet_network().
51 * author:
52 *	Paul Vixie (ISC), July 1996
53 */
54char *
55inet_neta(in_addr_t src, char *dst, size_t size)
56{
57	char *odst = dst;
58	char *tp;
59
60	while (src & 0xffffffff) {
61		u_char b = (src & 0xff000000) >> 24;
62
63		src <<= 8;
64		if (b) {
65			if (size < sizeof "255.")
66				goto emsgsize;
67			tp = dst;
68			dst += SPRINTF((dst, "%u", b));
69			if (src != 0L) {
70				*dst++ = '.';
71				*dst = '\0';
72			}
73			size -= (size_t)(dst - tp);
74		}
75	}
76	if (dst == odst) {
77		if (size < sizeof "0.0.0.0")
78			goto emsgsize;
79		strcpy(dst, "0.0.0.0");
80	}
81	return (odst);
82
83 emsgsize:
84	errno = EMSGSIZE;
85	return (NULL);
86}
87
88/*
89 * Weak aliases for applications that use certain private entry points,
90 * and fail to include <arpa/inet.h>.
91 */
92#undef inet_neta
93__weak_reference(__inet_neta, inet_neta);
94
95/*! \file */
96