1/*
2 * Copyright (c) 1996,1999 by Internet Software Consortium.
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
15 * SOFTWARE.
16 */
17
18#if defined(LIBC_SCCS) && !defined(lint)
19static const char rcsid[] = "$BINDId: inet_neta.c,v 1.6 1999/01/08 19:23:45 vixie Exp $";
20#endif
21
22#include <sys/types.h>
23#include <sys/socket.h>
24#include <netinet/in.h>
25#include <arpa/inet.h>
26
27#include <errno.h>
28#include <stdio.h>
29#include <string.h>
30
31#ifdef SPRINTF_CHAR
32# define SPRINTF(x) strlen(sprintf/**/x)
33#else
34# define SPRINTF(x) ((size_t)sprintf x)
35#endif
36
37/*
38 * char *
39 * inet_neta(src, dst, size)
40 * format a u_long network number into presentation format.
41 * return:
42 * pointer to dst, or NULL if an error occurred (check errno).
43 * note:
44 * format of ``src'' is as for inet_network().
45 * author:
46 * Paul Vixie (ISC), July 1996
47 */
48char *
49inet_neta (u_int32_t src, char *dst, size_t size)
50{
51 char *odst = dst;
52 char *tp;
53
54 while (src & 0xffffffff) {
55 u_char b = (src & 0xff000000) >> 24;
56
57 src <<= 8;
58 if (b) {
59 if (size < sizeof "255.")
60 goto emsgsize;
61 tp = dst;
62 dst += SPRINTF((dst, "%u", b));
63 if (src != 0L) {
64 *dst++ = '.';
65 *dst = '\0';
66 }
67 size -= (size_t)(dst - tp);
68 }
69 }
70 if (dst == odst) {
71 if (size < sizeof "0.0.0.0")
72 goto emsgsize;
73 strcpy(dst, "0.0.0.0");
74 }
75 return (odst);
76
77 emsgsize:
78 __set_errno (EMSGSIZE);
79 return (NULL);
80}
81