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 | #if defined(LIBC_SCCS) && !defined(lint) |
19 | static const char rcsid[] = "$BINDId: inet_neta.c,v 1.6 1999/01/08 19:23:45 vixie Exp $" ; |
20 | #endif |
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 | #ifdef SPRINTF_CHAR |
32 | # define SPRINTF(x) strlen(sprintf/**/x) |
33 | #else |
34 | # define SPRINTF(x) ((size_t)sprintf x) |
35 | #endif |
36 | |
37 | /* |
38 | * char * |
39 | * inet_neta(src, dst, size) |
40 | * format a u_long network number into presentation format. |
41 | * return: |
42 | * pointer to dst, or NULL if an error occurred (check errno). |
43 | * note: |
44 | * format of ``src'' is as for inet_network(). |
45 | * author: |
46 | * Paul Vixie (ISC), July 1996 |
47 | */ |
48 | char * |
49 | inet_neta (u_int32_t src, char *dst, size_t size) |
50 | { |
51 | char *odst = dst; |
52 | char *tp; |
53 | |
54 | while (src & 0xffffffff) { |
55 | u_char b = (src & 0xff000000) >> 24; |
56 | |
57 | src <<= 8; |
58 | if (b) { |
59 | if (size < sizeof "255." ) |
60 | goto emsgsize; |
61 | tp = dst; |
62 | dst += SPRINTF((dst, "%u" , b)); |
63 | if (src != 0L) { |
64 | *dst++ = '.'; |
65 | *dst = '\0'; |
66 | } |
67 | size -= (size_t)(dst - tp); |
68 | } |
69 | } |
70 | if (dst == odst) { |
71 | if (size < sizeof "0.0.0.0" ) |
72 | goto emsgsize; |
73 | strcpy(dst, "0.0.0.0" ); |
74 | } |
75 | return (odst); |
76 | |
77 | emsgsize: |
78 | __set_errno (EMSGSIZE); |
79 | return (NULL); |
80 | } |
81 | |