1 /*
2 * Copyright (c) 1996 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 /*
19 * Portions copyright (c) 1999, 2000
20 * Intel Corporation.
21 * All rights reserved.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 *
27 * 1. Redistributions of source code must retain the above copyright
28 * notice, this list of conditions and the following disclaimer.
29 *
30 * 2. Redistributions in binary form must reproduce the above copyright
31 * notice, this list of conditions and the following disclaimer in the
32 * documentation and/or other materials provided with the distribution.
33 *
34 * 3. All advertising materials mentioning features or use of this software
35 * must display the following acknowledgement:
36 *
37 * This product includes software developed by Intel Corporation and
38 * its contributors.
39 *
40 * 4. Neither the name of Intel Corporation or its contributors may be
41 * used to endorse or promote products derived from this software
42 * without specific prior written permission.
43 *
44 * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS''
45 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
47 * ARE DISCLAIMED. IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE
48 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
49 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
50 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
51 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
52 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
53 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
54 * THE POSSIBILITY OF SUCH DAMAGE.
55 *
56 */
57
58 #if defined(LIBC_SCCS) && !defined(lint)
59 static const char orig_rcsid[] = "From Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp";
60 static const char rcsid[] = "$Id: inet_neta.c,v 1.1.1.1 2003/11/19 01:51:29 kyu3 Exp $";
61 #endif
62
63 #include <sys/types.h>
64 #include <sys/socket.h>
65 #include <netinet/in.h>
66 #include <arpa/inet.h>
67
68 #include <errno.h>
69 #include <stdio.h>
70 #include <string.h>
71
72 #ifdef SPRINTF_CHAR
73 # define SPRINTF(x) strlen(sprintf/**/x)
74 #else
75 # define SPRINTF(x) ((size_t)sprintf x)
76 #endif
77
78 /*
79 * char *
80 * inet_neta(src, dst, size)
81 * format a u_long network number into presentation format.
82 * return:
83 * pointer to dst, or NULL if an error occurred (check errno).
84 * note:
85 * format of ``src'' is as for inet_network().
86 * author:
87 * Paul Vixie (ISC), July 1996
88 */
89 char *
inet_neta(u_long src,char * dst,size_t size)90 inet_neta(
91 u_long src,
92 char *dst,
93 size_t size
94 )
95 {
96 char *odst = dst;
97 char *tp;
98
99 while (src & 0xffffffff) {
100 u_char b = (u_char)((src & 0xff000000) >> 24);
101
102 src <<= 8;
103 if (b) {
104 if (size < sizeof "255.")
105 goto emsgsize;
106 tp = dst;
107 dst += SPRINTF((dst, "%u", b));
108 if (src != 0L) {
109 *dst++ = '.';
110 *dst = '\0';
111 }
112 size -= (size_t)(dst - tp);
113 }
114 }
115 if (dst == odst) {
116 if (size < sizeof "0.0.0.0")
117 goto emsgsize;
118 strcpy(dst, "0.0.0.0");
119 }
120 return (odst);
121
122 emsgsize:
123 errno = EMSGSIZE;
124 return (NULL);
125 }
126