1 /* $NetBSD: inet_neta.c,v 1.3 2012/06/25 22:32:44 abs 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
23 static 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 1.3 2012/06/25 22:32:44 abs 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
__weak_alias(inet_neta,_inet_neta)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 */
55 char *
56 inet_neta(u_long src, char *dst, size_t size)
57 {
58 char *odst = dst;
59 char *ep;
60 int advance;
61
62 _DIAGASSERT(dst != NULL);
63
64 if (src == 0x00000000) {
65 if (size < sizeof "0.0.0.0")
66 goto emsgsize;
67 strlcpy(dst, "0.0.0.0", size);
68 return dst;
69 }
70 ep = dst + size;
71 if (ep <= dst)
72 goto emsgsize;
73 while (src & 0xffffffffUL) {
74 u_char b = (u_char)((src & 0xff000000UL) >> 24);
75
76 src <<= 8;
77 if (b || src) {
78 advance = snprintf(dst, (size_t)(ep - dst), "%u", b);
79 if (advance <= 0 || advance >= ep - dst)
80 goto emsgsize;
81 dst += advance;
82 if (src != 0L) {
83 if (dst + 1 >= ep)
84 goto emsgsize;
85 *dst++ = '.';
86 *dst = '\0';
87 }
88 }
89 }
90 return (odst);
91
92 emsgsize:
93 errno = EMSGSIZE;
94 return (NULL);
95 }
96