2 * Copyright (c) 1996 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 orig_rcsid[] = "From Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp";
21 #include <sys/cdefs.h>
22 __FBSDID("$FreeBSD$");
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <arpa/inet.h>
35 # define SPRINTF(x) strlen(sprintf/**/x)
37 # define SPRINTF(x) ((size_t)sprintf x)
40 static char * inet_net_ntop_ipv4(const u_char *src, int bits, char *dst,
45 * inet_net_ntop(af, src, bits, dst, size)
46 * convert network number from network to presentation format.
47 * generates CIDR style result always.
49 * pointer to dst, or NULL if an error occurred (check errno).
51 * Paul Vixie (ISC), July 1996
54 inet_net_ntop(af, src, bits, dst, size)
63 return (inet_net_ntop_ipv4(src, bits, dst, size));
72 * inet_net_ntop_ipv4(src, bits, dst, size)
73 * convert IPv4 network number from network to presentation format.
74 * generates CIDR style result always.
76 * pointer to dst, or NULL if an error occurred (check errno).
78 * network byte order assumed. this means 192.5.5.240/28 has
79 * 0x11110000 in its fourth octet.
81 * Paul Vixie (ISC), July 1996
84 inet_net_ntop_ipv4(src, bits, dst, size)
95 if (bits < 0 || bits > 32) {
100 if (size < sizeof "0")
106 /* Format whole octets. */
107 for (b = bits / 8; b > 0; b--) {
108 if (size < sizeof "255.")
111 dst += SPRINTF((dst, "%u", *src++));
116 size -= (size_t)(dst - t);
119 /* Format partial octet. */
122 if (size < sizeof ".255")
127 m = ((1 << b) - 1) << (8 - b);
128 dst += SPRINTF((dst, "%u", *src & m));
129 size -= (size_t)(dst - t);
132 /* Format CIDR /width. */
133 if (size < sizeof "/32")
135 dst += SPRINTF((dst, "/%u", bits));
144 * Weak aliases for applications that use certain private entry points,
145 * and fail to include <arpa/inet.h>.
148 __weak_reference(__inet_net_ntop, inet_net_ntop);