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/* -*- buffer-read-only: t -*- vi: set ro: */
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/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
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/* inet_ntop.c -- convert IPv4 and IPv6 addresses from binary to text form
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Copyright (C) 2005-2006, 2008-2011 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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* Copyright (c) 1996-1999 by Internet Software Consortium.
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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#include <arpa/inet.h>
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#define NS_IN6ADDRSZ 16
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* WARNING: Don't even consider trying to compile this on a system where
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* sizeof(int) < 4. sizeof(int) > 4 is fine; all the world's not a VAX.
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typedef int verify_int_size[4 <= sizeof (int) ? 1 : -1];
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static const char *inet_ntop4 (const unsigned char *src, char *dst, socklen_t size);
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static const char *inet_ntop6 (const unsigned char *src, char *dst, socklen_t size);
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* inet_ntop(af, src, dst, size)
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* convert a network format address to presentation format.
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* pointer to presentation format address (`dst'), or NULL (see errno).
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inet_ntop (int af, const void *restrict src,
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char *restrict dst, socklen_t cnt)
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return (inet_ntop4 (src, dst, cnt));
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return (inet_ntop6 (src, dst, cnt));
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* inet_ntop4(src, dst, size)
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* format an IPv4 address
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* (2) takes a u_char* not an in_addr as input
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inet_ntop4 (const unsigned char *src, char *dst, socklen_t size)
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char tmp[sizeof "255.255.255.255"];
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len = sprintf (tmp, "%u.%u.%u.%u", src[0], src[1], src[2], src[3]);
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return strcpy (dst, tmp);
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* inet_ntop6(src, dst, size)
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* convert IPv6 binary address into presentation (printable) format
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inet_ntop6 (const unsigned char *src, char *dst, socklen_t size)
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* Note that int32_t and int16_t need only be "at least" large enough
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* to contain a value of the specified size. On some systems, like
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* Crays, there is no such thing as an integer variable with 16 bits.
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* Keep this in mind if you think this function should have been coded
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* to use pointer overlays. All the world's not a VAX.
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char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"], *tp;
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unsigned int words[NS_IN6ADDRSZ / NS_INT16SZ];
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* Copy the input (bytewise) array into a wordwise array.
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* Find the longest run of 0x00's in src[] for :: shorthanding.
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memset (words, '\0', sizeof words);
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for (i = 0; i < NS_IN6ADDRSZ; i += 2)
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words[i / 2] = (src[i] << 8) | src[i + 1];
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for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
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cur.base = i, cur.len = 1;
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if (best.base == -1 || cur.len > best.len)
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if (best.base == -1 || cur.len > best.len)
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if (best.base != -1 && best.len < 2)
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for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++)
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/* Are we inside the best run of 0x00's? */
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if (best.base != -1 && i >= best.base && i < (best.base + best.len))
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/* Are we following an initial run of 0x00s or any real hex? */
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/* Is this address an encapsulated IPv4? */
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if (i == 6 && best.base == 0 &&
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(best.len == 6 || (best.len == 5 && words[5] == 0xffff)))
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if (!inet_ntop4 (src + 12, tp, sizeof tmp - (tp - tmp)))
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int len = sprintf (tp, "%x", words[i]);
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/* Was it a trailing run of 0x00's? */
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if (best.base != -1 && (best.base + best.len) ==
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(NS_IN6ADDRSZ / NS_INT16SZ))
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* Check for overflow, copy, and we're done.
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if ((socklen_t) (tp - tmp) > size)
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return strcpy (dst, tmp);