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 * $Id: inet_neta.c,v 1.3 2005/04/27 04:56:20 sra Exp $
18 */
19
20 #include "port_before.h"
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 #include "port_after.h"
32
33 /*%
34 * char *
35 * inet_neta(src, dst, size)
36 * format an in_addr_t network number into presentation format.
37 * return:
38 * pointer to dst, or NULL if an error occurred (check errno).
39 * note:
40 * format of ``src'' is as for inet_network().
41 * author:
42 * Paul Vixie (ISC), July 1996
43 */
44 char *
inet_neta(in_addr_t src,char * dst,size_t size)45 inet_neta(in_addr_t src, char *dst, size_t size)
46 {
47 char *odst = dst;
48 char *tp;
49
50 while (src & 0xffffffff) {
51 u_char b = (src & 0xff000000) >> 24;
52
53 src <<= 8;
54 if (b) {
55 if (size < sizeof "255.")
56 goto emsgsize;
57 tp = dst;
58 dst += sprintf(dst, "%u", b);
59 if (src != 0L) {
60 *dst++ = '.';
61 *dst = '\0';
62 }
63 size -= (size_t)(dst - tp);
64 }
65 }
66 if (dst == odst) {
67 if (size < sizeof "0.0.0.0")
68 goto emsgsize;
69 strcpy(dst, "0.0.0.0");
70 }
71 return (odst);
72
73 emsgsize:
74 errno = EMSGSIZE;
75 return (NULL);
76 }
77
78 /*
79 * Weak aliases for applications that use certain private entry points,
80 * and fail to include <arpa/inet.h>.
81 */
82 #undef inet_neta
83 __weak_reference(__inet_neta, inet_neta);
84