1 /*
2 * Copyright (c) 1996,1999 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 #include <sys/types.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
22
23 #include <errno.h>
24 #include <stdio.h>
25 #include <string.h>
26
27 #ifdef SPRINTF_CHAR
28 # define SPRINTF(x) strlen(sprintf/**/x)
29 #else
30 # define SPRINTF(x) ((size_t)sprintf x)
31 #endif
32
33 /*
34 * char *
35 * inet_neta(src, dst, size)
36 * format a u_long network number into presentation format.
37 * return:
38 * pointer to dst, or NULL if an error occurred (check errno).
39 * note:
40 * format of ``src'' is as for inet_network().
41 * author:
42 * Paul Vixie (ISC), July 1996
43 */
44 char *
inet_neta(uint32_t src,char * dst,size_t size)45 inet_neta (uint32_t src, char *dst, size_t size)
46 {
47 char *odst = dst;
48 char *tp;
49
50 while (src & 0xffffffff) {
51 u_char b = (src & 0xff000000) >> 24;
52
53 src <<= 8;
54 if (b) {
55 if (size < sizeof "255.")
56 goto emsgsize;
57 tp = dst;
58 dst += SPRINTF((dst, "%u", b));
59 if (src != 0L) {
60 *dst++ = '.';
61 *dst = '\0';
62 }
63 size -= (size_t)(dst - tp);
64 }
65 }
66 if (dst == odst) {
67 if (size < sizeof "0.0.0.0")
68 goto emsgsize;
69 strcpy(dst, "0.0.0.0");
70 }
71 return (odst);
72
73 emsgsize:
74 __set_errno (EMSGSIZE);
75 return (NULL);
76 }
77