2 * Copyright (c) 1996,1999 by Internet Software Consortium.
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.
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
18 #if defined(LIBC_SCCS) && !defined(lint)
19 static const char rcsid[] = "$BINDId: inet_net_ntop.c,v 1.6 1999/01/08 19:23:42 vixie Exp $";
22 #include <sys/types.h>
23 #include <sys/socket.h>
24 #include <netinet/in.h>
25 #include <arpa/inet.h>
33 # define SPRINTF(x) strlen(sprintf/**/x)
35 # define SPRINTF(x) ((size_t)sprintf x)
38 static char * inet_net_ntop_ipv4 __P((const u_char *src, int bits,
39 char *dst, size_t size));
43 * inet_net_ntop(af, src, bits, dst, size)
44 * convert network number from network to presentation format.
45 * generates CIDR style result always.
47 * pointer to dst, or NULL if an error occurred (check errno).
49 * Paul Vixie (ISC), July 1996
52 inet_net_ntop(af, src, bits, dst, size)
61 return (inet_net_ntop_ipv4(src, bits, dst, size));
63 __set_errno (EAFNOSUPPORT);
70 * inet_net_ntop_ipv4(src, bits, dst, size)
71 * convert IPv4 network number from network to presentation format.
72 * generates CIDR style result always.
74 * pointer to dst, or NULL if an error occurred (check errno).
76 * network byte order assumed. this means 192.5.5.240/28 has
77 * 0b11110000 in its fourth octet.
79 * Paul Vixie (ISC), July 1996
82 inet_net_ntop_ipv4(src, bits, dst, size)
93 if (bits < 0 || bits > 32) {
98 if (size < sizeof "0")
105 /* Format whole octets. */
106 for (b = bits / 8; b > 0; b--) {
107 if (size < sizeof "255.")
110 dst += SPRINTF((dst, "%u", *src++));
115 size -= (size_t)(dst - t);
118 /* Format partial octet. */
121 if (size < sizeof ".255")
126 m = ((1 << b) - 1) << (8 - b);
127 dst += SPRINTF((dst, "%u", *src & m));
128 size -= (size_t)(dst - t);
131 /* Format CIDR /width. */
132 if (size < sizeof "/32")
134 dst += SPRINTF((dst, "/%u", bits));
138 __set_errno (EMSGSIZE);