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glibc/resolv/inet_neta.c
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/* | |
* Copyright (c) 1996,1999 by Internet Software Consortium. | |
* | |
* Permission to use, copy, modify, and distribute this software for any | |
* purpose with or without fee is hereby granted, provided that the above | |
* copyright notice and this permission notice appear in all copies. | |
* | |
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS | |
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES | |
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE | |
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL | |
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR | |
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS | |
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS | |
* SOFTWARE. | |
*/ | |
#if defined(LIBC_SCCS) && !defined(lint) | |
static const char rcsid[] = "$BINDId: inet_neta.c,v 1.6 1999/01/08 19:23:45 vixie Exp $"; | |
#endif | |
#include <sys/types.h> | |
#include <sys/socket.h> | |
#include <netinet/in.h> | |
#include <arpa/inet.h> | |
#include <errno.h> | |
#include <stdio.h> | |
#include <string.h> | |
#ifdef SPRINTF_CHAR | |
# define SPRINTF(x) strlen(sprintf/**/x) | |
#else | |
# define SPRINTF(x) ((size_t)sprintf x) | |
#endif | |
/* | |
* char * | |
* inet_neta(src, dst, size) | |
* format a u_long network number into presentation format. | |
* return: | |
* pointer to dst, or NULL if an error occurred (check errno). | |
* note: | |
* format of ``src'' is as for inet_network(). | |
* author: | |
* Paul Vixie (ISC), July 1996 | |
*/ | |
char * | |
inet_neta (u_int32_t src, char *dst, size_t size) | |
{ | |
char *odst = dst; | |
char *tp; | |
while (src & 0xffffffff) { | |
u_char b = (src & 0xff000000) >> 24; | |
src <<= 8; | |
if (b) { | |
if (size < sizeof "255.") | |
goto emsgsize; | |
tp = dst; | |
dst += SPRINTF((dst, "%u", b)); | |
if (src != 0L) { | |
*dst++ = '.'; | |
*dst = '\0'; | |
} | |
size -= (size_t)(dst - tp); | |
} | |
} | |
if (dst == odst) { | |
if (size < sizeof "0.0.0.0") | |
goto emsgsize; | |
strcpy(dst, "0.0.0.0"); | |
} | |
return (odst); | |
emsgsize: | |
__set_errno (EMSGSIZE); | |
return (NULL); | |
} |