1 /*	$NetBSD: inet_neta.c,v 1.1.1.1 2009/04/12 15:33:35 christos Exp $	*/
2 
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 
24 #include "port_before.h"
25 
26 #include <sys/types.h>
27 #include <sys/socket.h>
28 #include <netinet/in.h>
29 #include <arpa/inet.h>
30 
31 #include <errno.h>
32 #include <stdio.h>
33 #include <string.h>
34 
35 #include "port_after.h"
36 
37 #ifdef SPRINTF_CHAR
38 # define SPRINTF(x) strlen(sprintf/**/x)
39 #else
40 # define SPRINTF(x) ((size_t)sprintf x)
41 #endif
42 
43 /*%
44  * char *
45  * inet_neta(src, dst, size)
46  *	format a u_long network number into presentation format.
47  * return:
48  *	pointer to dst, or NULL if an error occurred (check errno).
49  * note:
50  *	format of ``src'' is as for inet_network().
51  * author:
52  *	Paul Vixie (ISC), July 1996
53  */
54 char *
55 inet_neta(src, dst, size)
56 	u_long src;
57 	char *dst;
58 	size_t size;
59 {
60 	char *odst = dst;
61 	char *tp;
62 
63 	while (src & 0xffffffff) {
64 		u_char b = (src & 0xff000000) >> 24;
65 
66 		src <<= 8;
67 		if (b) {
68 			if (size < sizeof "255.")
69 				goto emsgsize;
70 			tp = dst;
71 			dst += SPRINTF((dst, "%u", b));
72 			if (src != 0L) {
73 				*dst++ = '.';
74 				*dst = '\0';
75 			}
76 			size -= (size_t)(dst - tp);
77 		}
78 	}
79 	if (dst == odst) {
80 		if (size < sizeof "0.0.0.0")
81 			goto emsgsize;
82 		strcpy(dst, "0.0.0.0");
83 	}
84 	return (odst);
85 
86  emsgsize:
87 	errno = EMSGSIZE;
88 	return (NULL);
89 }
90 
91 /*! \file */
92