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 #include "port_before.h"
21
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
26
27 #include <errno.h>
28 #include <stdio.h>
29 #include <string.h>
30
31 #include "port_after.h"
32
33 #ifdef SPRINTF_CHAR
34 # define SPRINTF(x) strlen(sprintf/**/x)
35 #else
36 # define SPRINTF(x) ((size_t)sprintf x)
37 #endif
38
39 /*%
40 * char *
41 * inet_neta(src, dst, size)
42 * format an in_addr_t network number into presentation format.
43 * return:
44 * pointer to dst, or NULL if an error occurred (check errno).
45 * note:
46 * format of ``src'' is as for inet_network().
47 * author:
48 * Paul Vixie (ISC), July 1996
49 */
50 char *
inet_neta(in_addr_t src,char * dst,size_t size)51 inet_neta(in_addr_t src, char *dst, size_t size)
52 {
53 char *odst = dst;
54 char *tp;
55
56 while (src & 0xffffffff) {
57 u_char b = (src & 0xff000000) >> 24;
58
59 src <<= 8;
60 if (b) {
61 if (size < sizeof "255.")
62 goto emsgsize;
63 tp = dst;
64 dst += SPRINTF((dst, "%u", b));
65 if (src != 0L) {
66 *dst++ = '.';
67 *dst = '\0';
68 }
69 size -= (size_t)(dst - tp);
70 }
71 }
72 if (dst == odst) {
73 if (size < sizeof "0.0.0.0")
74 goto emsgsize;
75 strcpy(dst, "0.0.0.0");
76 }
77 return (odst);
78
79 emsgsize:
80 errno = EMSGSIZE;
81 return (NULL);
82 }
83
84 /*
85 * Weak aliases for applications that use certain private entry points,
86 * and fail to include <arpa/inet.h>.
87 */
88 #undef inet_neta
89 __weak_reference(__inet_neta, inet_neta);
90
91 /*! \file */
92