140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/*
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* Copyright (c) 2016 - Carsten Larsen
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* Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Heimdal: inet_ntop.c 21005 2007-06-08 01:54:35Z lha $
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* $NetBSD: inet_ntop.c,v 1.2 2008/03/22 08:37:21 mlelstv Exp $
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#ifndef INET_ADDRSTRLEN
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# define INET_ADDRSTRLEN 16
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#endif
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static const char *
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inet_ntop_v4 (const void *src, char *dst, size_t size)
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{
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const char digits[] = "0123456789";
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int i;
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struct in_addr *addr = (struct in_addr *)src;
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u_long a = ntohl(addr->s_addr);
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const char *orig_dst = dst;
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if (size < INET_ADDRSTRLEN) {
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errno = ENOSPC;
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return NULL;
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}
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for (i = 0; i < 4; ++i) {
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int n = (a >> (24 - i * 8)) & 0xFF;
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int non_zerop = 0;
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if (non_zerop || n / 100 > 0) {
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*dst++ = digits[n / 100];
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n %= 100;
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non_zerop = 1;
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}
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if (non_zerop || n / 10 > 0) {
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*dst++ = digits[n / 10];
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n %= 10;
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non_zerop = 1;
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}
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*dst++ = digits[n];
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if (i != 3)
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*dst++ = '.';
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}
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*dst++ = '\0';
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return orig_dst;
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}
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#ifdef IPV6
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static const char *
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inet_ntop_v6 (const void *src, char *dst, size_t size)
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{
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const char xdigits[] = "0123456789abcdef";
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int i;
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const struct in6_addr *addr = (struct in6_addr *)src;
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const u_char *ptr = addr->s6_addr;
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const char *orig_dst = dst;
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if (size < INET6_ADDRSTRLEN) {
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errno = ENOSPC;
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return NULL;
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}
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for (i = 0; i < 8; ++i) {
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int non_zerop = 0;
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if (non_zerop || (ptr[0] >> 4)) {
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*dst++ = xdigits[ptr[0] >> 4];
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non_zerop = 1;
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}
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if (non_zerop || (ptr[0] & 0x0F)) {
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*dst++ = xdigits[ptr[0] & 0x0F];
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non_zerop = 1;
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}
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if (non_zerop || (ptr[1] >> 4)) {
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*dst++ = xdigits[ptr[1] >> 4];
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non_zerop = 1;
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}
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*dst++ = xdigits[ptr[1] & 0x0F];
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if (i != 7)
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*dst++ = ':';
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ptr += 2;
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}
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*dst++ = '\0';
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return orig_dst;
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}
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#endif /* IPV6 */
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const char *
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inet_ntop(int af, const void *src, char *dst, size_t size)
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{
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switch (af) {
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case AF_INET :
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return inet_ntop_v4 (src, dst, size);
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#ifdef IPV6
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case AF_INET6 :
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return inet_ntop_v6 (src, dst, size);
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#endif
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default :
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errno = EAFNOSUPPORT;
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return NULL;
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}
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}
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