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/*
* Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
RCSID("$Id: inet_ntop.c,v 1.5 2001/04/04 23:58:01 assar Exp $");
#endif
#include <roken.h>
/*
*
*/
static const char *
inet_ntop_v4 (const void *src, char *dst, size_t size)
{
const char digits[] = "0123456789";
int i;
struct in_addr *addr = (struct in_addr *)src;
u_long a = ntohl(addr->s_addr);
const char *orig_dst = dst;
if (size < INET_ADDRSTRLEN) {
errno = ENOSPC;
return NULL;
}
for (i = 0; i < 4; ++i) {
int n = (a >> (24 - i * 8)) & 0xFF;
int non_zerop = 0;
if (non_zerop || n / 100 > 0) {
*dst++ = digits[n / 100];
n %= 100;
non_zerop = 1;
}
if (non_zerop || n / 10 > 0) {
*dst++ = digits[n / 10];
n %= 10;
non_zerop = 1;
}
*dst++ = digits[n];
if (i != 3)
*dst++ = '.';
}
*dst++ = '\0';
return orig_dst;
}
#ifdef HAVE_IPV6
static const char *
inet_ntop_v6 (const void *src, char *dst, size_t size)
{
const char xdigits[] = "0123456789abcdef";
int i;
const struct in6_addr *addr = (struct in6_addr *)src;
const u_char *ptr = addr->s6_addr;
const char *orig_dst = dst;
if (size < INET6_ADDRSTRLEN) {
errno = ENOSPC;
return NULL;
}
for (i = 0; i < 8; ++i) {
int non_zerop = 0;
if (non_zerop || (ptr[0] >> 4)) {
*dst++ = xdigits[ptr[0] >> 4];
non_zerop = 1;
}
if (non_zerop || (ptr[0] & 0x0F)) {
*dst++ = xdigits[ptr[0] & 0x0F];
non_zerop = 1;
}
if (non_zerop || (ptr[1] >> 4)) {
*dst++ = xdigits[ptr[1] >> 4];
non_zerop = 1;
}
*dst++ = xdigits[ptr[1] & 0x0F];
if (i != 7)
*dst++ = ':';
ptr += 2;
}
*dst++ = '\0';
return orig_dst;
}
#endif /* HAVE_IPV6 */
const char *
inet_ntop(int af, const void *src, char *dst, size_t size)
{
switch (af) {
case AF_INET :
return inet_ntop_v4 (src, dst, size);
#ifdef HAVE_IPV6
case AF_INET6 :
return inet_ntop_v6 (src, dst, size);
#endif
default :
errno = EAFNOSUPPORT;
return NULL;
}
}
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