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/* $OpenBSD: inet_neta.c,v 1.7 2005/08/06 20:30:03 espie 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/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 <errno.h> |
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#include <stdio.h> |
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#include <string.h> |
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/* |
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* char * |
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* inet_neta(src, dst, size) |
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* format an in_addr_t 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(in_addr_t src, char *dst, 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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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 = (src & 0xff000000) >> 24; |
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src <<= 8; |
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if (b || src) { |
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if (ep - dst < sizeof "255.") |
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goto emsgsize; |
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advance = snprintf(dst, 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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} |