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 rcsid[] = "$Id: inet_net_ntop.c,v 1.4 1999/01/01 04:17:13 momjian Exp $";
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
34 #include <utils/builtins.h>
37 #define SPRINTF(x) strlen(sprintf/**/x)
39 #define SPRINTF(x) ((size_t)sprintf x)
42 static char *inet_net_ntop_ipv4(const u_char *src, int bits,
43 char *dst, size_t size);
44 static char *inet_cidr_ntop_ipv4(const u_char *src, int bits,
45 char *dst, size_t size);
49 * inet_cidr_ntop(af, src, bits, dst, size)
50 * convert network number from network to presentation format.
51 * generates CIDR style result always.
53 * pointer to dst, or NULL if an error occurred (check errno).
55 * Paul Vixie (ISC), July 1996
58 inet_cidr_ntop(int af, const void *src, int bits, char *dst, size_t size)
63 return (inet_cidr_ntop_ipv4(src, bits, dst, size));
73 * inet_cidr_ntop_ipv4(src, bits, dst, size)
74 * convert IPv4 network number from network to presentation format.
75 * generates CIDR style result always.
77 * pointer to dst, or NULL if an error occurred (check errno).
79 * network byte order assumed. this means 192.5.5.240/28 has
80 * 0x11110000 in its fourth octet.
82 * Paul Vixie (ISC), July 1996
85 inet_cidr_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
92 if (bits < 0 || bits > 32)
99 if (size < sizeof "0")
105 /* Format whole octets. */
106 for (b = bits / 8; b > 0; b--)
108 if (size < sizeof "255.")
111 dst += SPRINTF((dst, "%u", *src++));
117 size -= (size_t) (dst - t);
120 /* Format partial octet. */
124 if (size < sizeof ".255")
129 m = ((1 << b) - 1) << (8 - b);
130 dst += SPRINTF((dst, "%u", *src & m));
131 size -= (size_t) (dst - t);
134 /* Format CIDR /width. */
135 if (size < sizeof "/32")
137 dst += SPRINTF((dst, "/%u", bits));
148 * inet_net_ntop(af, src, bits, dst, size)
149 * convert host/network address from network to presentation format.
150 * "src"'s size is determined from its "af".
152 * pointer to dst, or NULL if an error occurred (check errno).
154 * 192.5.5.1/28 has a nonzero host part, which means it isn't a network
155 * as called for by inet_net_pton() but it can be a host address with
156 * an included netmask.
158 * Paul Vixie (ISC), October 1998
161 inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size)
166 return (inet_net_ntop_ipv4(src, bits, dst, size));
168 errno = EAFNOSUPPORT;
175 * inet_net_ntop_ipv4(src, bits, dst, size)
176 * convert IPv4 network address from network to presentation format.
177 * "src"'s size is determined from its "af".
179 * pointer to dst, or NULL if an error occurred (check errno).
181 * network byte order assumed. this means 192.5.5.240/28 has
182 * 0b11110000 in its fourth octet.
184 * Paul Vixie (ISC), October 1998
187 inet_net_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
194 if (bits < 0 || bits > 32)
201 if (size < sizeof "0")
208 /* Format whole octets plus nonzero trailing octets. */
209 tb = (bits == 32) ? 31 : bits;
210 for (b = 0; b <= (tb / 8) || (b < len && *src != 0); b++)
212 if (size < sizeof "255.")
215 dst += SPRINTF((dst, "%u", *src++));
216 if (b + 1 <= (tb / 8) || (b + 1 < len && *src != 0))
221 size -= (size_t)(dst - t);
224 /* don't print masklen if 32 bits */
228 /* Format CIDR /width. */
229 if (size < sizeof "/32")
231 dst += SPRINTF((dst, "/%u", bits));