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9385eb3d A |
1 | /* |
2 | * Copyright (c) 1996 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 orig_rcsid[] = "From Id: inet_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp"; | |
20 | #endif | |
21 | #include <sys/cdefs.h> | |
22 | __FBSDID("$FreeBSD: src/lib/libc/net/inet_neta.c,v 1.9 2003/01/01 18:48:43 schweikh Exp $"); | |
23 | ||
24 | #include <sys/types.h> | |
25 | #include <sys/socket.h> | |
26 | #include <netinet/in.h> | |
27 | #include <arpa/inet.h> | |
28 | ||
29 | #include <errno.h> | |
30 | #include <stdio.h> | |
31 | #include <string.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 * | |
51 | inet_neta(src, dst, size) | |
52 | in_addr_t src; | |
53 | char *dst; | |
54 | 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); |