1 /* $NetBSD: inet_neta.c,v 1.1.1.2 2012/09/09 16:07:50 christos Exp $ */
2
3 /*
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1996,1999 by Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #if defined(LIBC_SCCS) && !defined(lint)
21 static const char rcsid[] = "Id: inet_neta.c,v 1.3 2005/04/27 04:56:20 sra Exp ";
22 #endif
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 a u_long 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 */
54 char *
inet_neta(src,dst,size)55 inet_neta(src, dst, size)
56 u_long src;
57 char *dst;
58 size_t size;
59 {
60 char *odst = dst;
61 char *tp;
62
63 while (src & 0xffffffff) {
64 u_char b = (src & 0xff000000) >> 24;
65
66 src <<= 8;
67 if (b) {
68 if (size < sizeof "255.")
69 goto emsgsize;
70 tp = dst;
71 dst += SPRINTF((dst, "%u", b));
72 if (src != 0L) {
73 *dst++ = '.';
74 *dst = '\0';
75 }
76 size -= (size_t)(dst - tp);
77 }
78 }
79 if (dst == odst) {
80 if (size < sizeof "0.0.0.0")
81 goto emsgsize;
82 strcpy(dst, "0.0.0.0");
83 }
84 return (odst);
85
86 emsgsize:
87 errno = EMSGSIZE;
88 return (NULL);
89 }
90
91 /*! \file */
92