161 lines
3.6 KiB
C
161 lines
3.6 KiB
C
/* $NetBSD: inet_net_ntop.c,v 1.11 2000/04/23 16:59:12 itojun Exp $ */
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/*
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* Copyright (c) 1996,1999 by Internet Software Consortium.
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*
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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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*
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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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* SOFTWARE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static const char rcsid[] = "Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp ";
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#else
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__RCSID("$NetBSD: inet_net_ntop.c,v 1.11 2000/04/23 16:59:12 itojun Exp $");
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#endif
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#endif
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#include "namespace.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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#include <arpa/inet.h>
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef __weak_alias
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__weak_alias(inet_net_ntop,_inet_net_ntop)
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#endif
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#ifdef SPRINTF_CHAR
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# define SPRINTF(x) strlen(sprintf/**/x)
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#else
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# define SPRINTF(x) ((size_t)sprintf x)
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#endif
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static char * inet_net_ntop_ipv4 __P((const u_char *src, int bits,
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char *dst, size_t size));
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/*
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* char *
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* inet_net_ntop(af, src, bits, dst, size)
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* convert network number from network to presentation format.
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* generates CIDR style result always.
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* return:
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* pointer to dst, or NULL if an error occurred (check errno).
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* author:
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* Paul Vixie (ISC), July 1996
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*/
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char *
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inet_net_ntop(af, src, bits, dst, size)
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int af;
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const void *src;
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int bits;
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char *dst;
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size_t size;
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{
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_DIAGASSERT(src != NULL);
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_DIAGASSERT(dst != NULL);
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switch (af) {
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case AF_INET:
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return (inet_net_ntop_ipv4(src, bits, dst, size));
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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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/*
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* static char *
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* inet_net_ntop_ipv4(src, bits, dst, size)
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* convert IPv4 network number from network to presentation format.
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* generates CIDR style result always.
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* return:
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* pointer to dst, or NULL if an error occurred (check errno).
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* note:
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* network byte order assumed. this means 192.5.5.240/28 has
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* 0b11110000 in its fourth octet.
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* author:
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* Paul Vixie (ISC), July 1996
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*/
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static char *
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inet_net_ntop_ipv4(src, bits, dst, size)
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const u_char *src;
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int bits;
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char *dst;
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size_t size;
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{
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char *odst = dst;
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char *t;
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u_int m;
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int b;
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_DIAGASSERT(src != NULL);
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_DIAGASSERT(dst != NULL);
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if (bits < 0 || bits > 32) {
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errno = EINVAL;
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return (NULL);
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}
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if (bits == 0) {
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if (size < sizeof "0")
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goto emsgsize;
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*dst++ = '0';
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size--;
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*dst = '\0';
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}
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/* Format whole octets. */
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for (b = bits / 8; b > 0; b--) {
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if (size < sizeof "255.")
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goto emsgsize;
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t = dst;
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dst += SPRINTF((dst, "%u", *src++));
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if (b > 1) {
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*dst++ = '.';
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*dst = '\0';
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}
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size -= (size_t)(dst - t);
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}
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/* Format partial octet. */
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b = bits % 8;
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if (b > 0) {
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if (size < sizeof ".255")
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goto emsgsize;
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t = dst;
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if (dst != odst)
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*dst++ = '.';
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m = ((1 << b) - 1) << (8 - b);
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dst += SPRINTF((dst, "%u", *src & m));
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size -= (size_t)(dst - t);
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}
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/* Format CIDR /width. */
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if (size < sizeof "/32")
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goto emsgsize;
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dst += SPRINTF((dst, "/%u", bits));
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return (odst);
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emsgsize:
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errno = EMSGSIZE;
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return (NULL);
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}
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