1 /*-
2 * SPDX-License-Identifier: ISC
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 $";
22 #endif
23 #include <sys/cdefs.h>
24 __FBSDID("$FreeBSD$");
25
26 #include "port_before.h"
27
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <netinet/in.h>
31 #include <arpa/inet.h>
32
33 #include <errno.h>
34 #include <stdio.h>
35 #include <string.h>
36
37 #include "port_after.h"
38
39 #ifdef SPRINTF_CHAR
40 # define SPRINTF(x) strlen(sprintf/**/x)
41 #else
42 # define SPRINTF(x) ((size_t)sprintf x)
43 #endif
44
45 /*%
46 * char *
47 * inet_neta(src, dst, size)
48 * format an in_addr_t network number into presentation format.
49 * return:
50 * pointer to dst, or NULL if an error occurred (check errno).
51 * note:
52 * format of ``src'' is as for inet_network().
53 * author:
54 * Paul Vixie (ISC), July 1996
55 */
56 char *
inet_neta(in_addr_t src,char * dst,size_t size)57 inet_neta(in_addr_t src, char *dst, size_t size)
58 {
59 char *odst = dst;
60 char *tp;
61
62 while (src & 0xffffffff) {
63 u_char b = (src & 0xff000000) >> 24;
64
65 src <<= 8;
66 if (b) {
67 if (size < sizeof "255.")
68 goto emsgsize;
69 tp = dst;
70 dst += SPRINTF((dst, "%u", b));
71 if (src != 0L) {
72 *dst++ = '.';
73 *dst = '\0';
74 }
75 size -= (size_t)(dst - tp);
76 }
77 }
78 if (dst == odst) {
79 if (size < sizeof "0.0.0.0")
80 goto emsgsize;
81 strcpy(dst, "0.0.0.0");
82 }
83 return (odst);
84
85 emsgsize:
86 errno = EMSGSIZE;
87 return (NULL);
88 }
89
90 /*
91 * Weak aliases for applications that use certain private entry points,
92 * and fail to include <arpa/inet.h>.
93 */
94 #undef inet_neta
95 __weak_reference(__inet_neta, inet_neta);
96
97 /*! \file */
98