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/****************************************************************************
* libc/net/lib_inetntop.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Includes some logic extracted from hwport_ftpd, written by Jaehyuk Cho
* <minzkn@minzkn.com> which was released under the BSD license.
*
* Copyright (C) HWPORT.COM. All rights reserved.
* Author: JAEHYUK CHO <mailto:minzkn@minzkn.com>
*
* 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 NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/socket.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: inet_ntop
*
* Description:
* The inet_ntop() function converts a numeric address into a text string
* suitable for presentation.
*
* Input Parameters:
* af - The af argument specifies the family of the address. This can be
* AF_INET or AF_INET6.
* src - The src argument points to a buffer holding an address of the
* specified type. The address must be in network byte order.
* dst - The dst argument points to a buffer where the function stores
* the resulting text string; it shall not be NULL.
* size - The size argument specifies the size of this buffer, which must
* be large enough to hold the text string (INET_ADDRSTRLEN
* characters for IPv4, INET6_ADDRSTRLEN characters for IPv6).
*
* Returned Value:
* inet_ntop() returns a pointer to the buffer containing the text string
* if the conversion succeeds. Otherwise, NULL is returned and the errno
* is set to indicate the error. There follow errno values may be set:
*
* EAFNOSUPPORT - The af argument is invalid.
* ENOSPC - The size of the inet_ntop() result buffer is inadequate
*
****************************************************************************/
FAR const char *inet_ntop(int af, FAR const void *src, FAR char *dst, socklen_t size)
{
int errval;
#ifndef CONFIG_NET_IPv6
FAR char *ptr;
DEBUGASSERT(src && dst);
if (af != AF_INET)
{
errval = EAFNOSUPPORT;
goto errout;
}
if (size < INET_ADDRSTRLEN)
{
errval = ENOSPC;
goto errout;
}
ptr = (FAR char*)src;
sprintf(dst, "%d.%d.%d.%d", ptr[0], ptr[1], ptr[2], ptr[3]);
return dst;
#else
FAR const struct in6_addr *in6_addr;
uint16_t warray[8];
int offset;
int entry;
int count;
int maxentry;
int maxcount;
DEBUGASSERT(src && dst);
if (af != AF_INET6)
{
errval = EAFNOSUPPORT;
goto errout;
}
if (size < INET6_ADDRSTRLEN)
{
errval = ENOSPC;
goto errout;
}
in6_addr = (FAR const struct in6_addr *)src;
entry = -1;
maxentry = -1;
maxcount = 0;
offset = 0;
while (offset < 8)
{
warray[offset] = ntohs(in6_addr->s6_addr16[offset]);
if (warray[offset] == 0)
{
entry = offset;
count = 1;
offset++;
while (offset < 8)
{
warray[offset] = ntohs(in6_addr->s6_addr16[offset]);
if (warray[offset] != 0)
{
break;
}
offset++;
count++;
}
if (count > maxcount)
{
maxentry = entry;
maxcount = count;
}
}
offset++;
}
offset = 0;
dst[0] = '\0';
while (offset < 8)
{
if (offset == maxentry)
{
size -= snprintf(&dst[strlen(dst)], size, ":");
offset += maxcount;
if (offset >= 8)
{
size -= snprintf(&dst[strlen(dst)], size, ":");
}
}
else
{
if (offset > 0)
{
size -= snprintf(&dst[strlen(dst)], size, ":");
}
size -= snprintf(&dst[strlen(dst)], size, "%x", warray[offset]);
offset++;
}
}
return dst;
#endif
errout:
set_errno(errval);
memset(dst, 0, size);
return NULL;
}
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