2 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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36 RCSID("$Id: inet_ntop.c,v 1.5 2001/04/04 23:58:01 assar Exp $");
46 inet_ntop_v4 (const void *src, char *dst, size_t size)
48 const char digits[] = "0123456789";
50 struct in_addr *addr = (struct in_addr *)src;
51 u_long a = ntohl(addr->s_addr);
52 const char *orig_dst = dst;
54 if (size < INET_ADDRSTRLEN) {
58 for (i = 0; i < 4; ++i) {
59 int n = (a >> (24 - i * 8)) & 0xFF;
62 if (non_zerop || n / 100 > 0) {
63 *dst++ = digits[n / 100];
67 if (non_zerop || n / 10 > 0) {
68 *dst++ = digits[n / 10];
82 inet_ntop_v6 (const void *src, char *dst, size_t size)
84 const char xdigits[] = "0123456789abcdef";
86 const struct in6_addr *addr = (struct in6_addr *)src;
87 const u_char *ptr = addr->s6_addr;
88 const char *orig_dst = dst;
90 if (size < INET6_ADDRSTRLEN) {
94 for (i = 0; i < 8; ++i) {
97 if (non_zerop || (ptr[0] >> 4)) {
98 *dst++ = xdigits[ptr[0] >> 4];
101 if (non_zerop || (ptr[0] & 0x0F)) {
102 *dst++ = xdigits[ptr[0] & 0x0F];
105 if (non_zerop || (ptr[1] >> 4)) {
106 *dst++ = xdigits[ptr[1] >> 4];
109 *dst++ = xdigits[ptr[1] & 0x0F];
117 #endif /* HAVE_IPV6 */
120 inet_ntop(int af, const void *src, char *dst, size_t size)
124 return inet_ntop_v4 (src, dst, size);
127 return inet_ntop_v6 (src, dst, size);
130 errno = EAFNOSUPPORT;