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