freebsd-dev/contrib/tcpdump/missing/inet_ntop.c
2001-04-03 07:45:48 +00:00

106 lines
3.1 KiB
C

/*
* Copyright (c) 1999 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. 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.
*/
/* $Id: inet_ntop.c,v 1.3 2000/01/09 21:35:45 fenner Exp $ */
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/missing/inet_ntop.c,v 1.3 2000/01/09 21:35:45 fenner Exp $";
#endif
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
/*
*
*/
#ifndef INET_ADDRSTRLEN
#define INET_ADDRSTRLEN 16
#endif
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;
}
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);
default :
errno = EAFNOSUPPORT;
return NULL;
}
}