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
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$Id: inet_neta.c,v 1.3 2005/04/27 04:56:20 sra Exp $";
20 #endif
21
22 #include "port_before.h"
23
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <arpa/inet.h>
28
29 #include <errno.h>
30 #include <stdio.h>
31 #include <string.h>
32
33 #include "port_after.h"
34
35 #ifdef SPRINTF_CHAR
36 # define SPRINTF(x) strlen(sprintf/**/x)
37 #else
38 # define SPRINTF(x) ((size_t)sprintf x)
39 #endif
40
41 /*%
42 * char *
43 * inet_neta(src, dst, size)
44 * format a u_long network number into presentation format.
45 * return:
46 * pointer to dst, or NULL if an error occurred (check errno).
47 * note:
48 * format of ``src'' is as for inet_network().
49 * author:
50 * Paul Vixie (ISC), July 1996
51 */
52 char *
inet_neta(src,dst,size)53 inet_neta(src, dst, size)
54 u_long src;
55 char *dst;
56 size_t size;
57 {
58 char *odst = dst;
59 char *tp;
60
61 while (src & 0xffffffff) {
62 u_char b = (src & 0xff000000) >> 24;
63
64 src <<= 8;
65 if (b) {
66 if (size < sizeof "255.")
67 goto emsgsize;
68 tp = dst;
69 dst += SPRINTF((dst, "%u", b));
70 if (src != 0L) {
71 *dst++ = '.';
72 *dst = '\0';
73 }
74 size -= (size_t)(dst - tp);
75 }
76 }
77 if (dst == odst) {
78 if (size < sizeof "0.0.0.0")
79 goto emsgsize;
80 strcpy(dst, "0.0.0.0");
81 }
82 return (odst);
83
84 emsgsize:
85 errno = EMSGSIZE;
86 return (NULL);
87 }
88
89 /*! \file */
90