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 #include <sys/types.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
29 # define SPRINTF(x) strlen(sprintf/**/x)
31 # define SPRINTF(x) ((size_t)sprintf x)
34 static char * inet_net_ntop_ipv4 (const u_char *src, int bits,
35 char *dst, size_t size) __THROW;
39 * inet_net_ntop(af, src, bits, dst, size)
40 * convert network number from network to presentation format.
41 * generates CIDR style result always.
43 * pointer to dst, or NULL if an error occurred (check errno).
45 * Paul Vixie (ISC), July 1996
48 inet_net_ntop (int af, const void *src, int bits, char *dst, size_t size)
52 return (inet_net_ntop_ipv4(src, bits, dst, size));
54 __set_errno (EAFNOSUPPORT);
61 * inet_net_ntop_ipv4(src, bits, dst, size)
62 * convert IPv4 network number from network to presentation format.
63 * generates CIDR style result always.
65 * pointer to dst, or NULL if an error occurred (check errno).
67 * network byte order assumed. this means 192.5.5.240/28 has
68 * 0b11110000 in its fourth octet.
70 * Paul Vixie (ISC), July 1996
73 inet_net_ntop_ipv4 (const u_char *src, int bits, char *dst, size_t size)
80 if (bits < 0 || bits > 32) {
85 if (size < sizeof "0")
92 /* Format whole octets. */
93 for (b = bits / 8; b > 0; b--) {
94 if (size < sizeof "255.")
97 dst += SPRINTF((dst, "%u", *src++));
102 size -= (size_t)(dst - t);
105 /* Format partial octet. */
108 if (size < sizeof ".255")
113 m = ((1 << b) - 1) << (8 - b);
114 dst += SPRINTF((dst, "%u", *src & m));
115 size -= (size_t)(dst - t);
118 /* Format CIDR /width. */
119 if (size < sizeof "/32")
121 dst += SPRINTF((dst, "/%u", bits));
125 __set_errno (EMSGSIZE);