inet_neta.c revision 156953 
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 1.1.206.1 2004/03/09 08:33:33 marka Exp $";
20#endif
21
22#include "port_before.h"
23
24#include <sys/types.h>
25#include <sys/socket.h>
26#include <netinet/in.h>
27#include <arpa/inet.h>
28
29#include <errno.h>
30#include <stdio.h>
31#include <string.h>
32
33#include "port_after.h"
34
35#ifdef SPRINTF_CHAR
36# define SPRINTF(x) strlen(sprintf/**/x)
37#else
38# define SPRINTF(x) ((size_t)sprintf x)
39#endif
40
41/*
42 * char *
43 * inet_neta(src, dst, size)
44 *	format a u_long network number into presentation format.
45 * return:
46 *	pointer to dst, or NULL if an error occurred (check errno).
47 * note:
48 *	format of ``src'' is as for inet_network().
49 * author:
50 *	Paul Vixie (ISC), July 1996
51 */
52char *
53inet_neta(src, dst, size)
54	u_long src;
55	char *dst;
56	size_t size;
57{
58	char *odst = dst;
59	char *tp;
60
61	while (src & 0xffffffff) {
62		u_char b = (src & 0xff000000) >> 24;
63
64		src <<= 8;
65		if (b) {
66			if (size < sizeof "255.")
67				goto emsgsize;
68			tp = dst;
69			dst += SPRINTF((dst, "%u", b));
70			if (src != 0L) {
71				*dst++ = '.';
72				*dst = '\0';
73			}
74			size -= (size_t)(dst - tp);
75		}
76	}
77	if (dst == odst) {
78		if (size < sizeof "0.0.0.0")
79			goto emsgsize;
80		strcpy(dst, "0.0.0.0");
81	}
82	return (odst);
83
84 emsgsize:
85	errno = EMSGSIZE;
86	return (NULL);
87}
88