99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/* $NetBSD: inet_neta.c,v 1.1 2004/05/20 23:13:02 christos Exp $ */
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/*
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* Copyright (c) 1996 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_neta.c,v 8.2 1996/08/08 06:54:44 vixie Exp ";
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#else
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__RCSID("$NetBSD: inet_neta.c,v 1.1 2004/05/20 23:13:02 christos 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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#ifdef __weak_alias
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__weak_alias(inet_neta,_inet_neta)
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#endif
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/*
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* char *
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* inet_neta(src, dst, size)
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* format a u_long network number into presentation format.
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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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* format of ``src'' is as for inet_network().
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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_neta(src, dst, size)
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u_long src;
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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 *ep;
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int advance;
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_DIAGASSERT(dst != NULL);
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if (src == 0x00000000) {
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if (size < sizeof "0.0.0.0")
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goto emsgsize;
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strlcpy(dst, "0.0.0.0", size);
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return dst;
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}
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ep = dst + size;
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if (ep <= dst)
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goto emsgsize;
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while (src & 0xffffffff) {
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u_char b = (u_char)((src & 0xff000000) >> 24);
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src <<= 8;
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if (b || src) {
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advance = snprintf(dst, (size_t)(ep - dst), "%u", b);
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if (advance <= 0 || advance >= ep - dst)
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goto emsgsize;
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dst += advance;
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if (src != 0L) {
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if (dst + 1 >= ep)
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goto emsgsize;
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*dst++ = '.';
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*dst = '\0';
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}
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}
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}
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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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