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glibc/resolv/inet_net_ntop.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_net_ntop.c,v 1.6 1999/01/08 19:23:42 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> | |
#include <stdlib.h> | |
#ifdef SPRINTF_CHAR | |
# define SPRINTF(x) strlen(sprintf/**/x) | |
#else | |
# define SPRINTF(x) ((size_t)sprintf x) | |
#endif | |
static char * inet_net_ntop_ipv4 (const u_char *src, int bits, | |
char *dst, size_t size) __THROW; | |
/* | |
* char * | |
* inet_net_ntop(af, src, bits, dst, size) | |
* convert network number from network to presentation format. | |
* generates CIDR style result always. | |
* return: | |
* pointer to dst, or NULL if an error occurred (check errno). | |
* author: | |
* Paul Vixie (ISC), July 1996 | |
*/ | |
char * | |
inet_net_ntop (int af, const void *src, int bits, char *dst, size_t size) | |
{ | |
switch (af) { | |
case AF_INET: | |
return (inet_net_ntop_ipv4(src, bits, dst, size)); | |
default: | |
__set_errno (EAFNOSUPPORT); | |
return (NULL); | |
} | |
} | |
/* | |
* static char * | |
* inet_net_ntop_ipv4(src, bits, dst, size) | |
* convert IPv4 network number from network to presentation format. | |
* generates CIDR style result always. | |
* return: | |
* pointer to dst, or NULL if an error occurred (check errno). | |
* note: | |
* network byte order assumed. this means 192.5.5.240/28 has | |
* 0b11110000 in its fourth octet. | |
* author: | |
* Paul Vixie (ISC), July 1996 | |
*/ | |
static char * | |
inet_net_ntop_ipv4 (const u_char *src, int bits, char *dst, size_t size) | |
{ | |
char *odst = dst; | |
char *t; | |
u_int m; | |
int b; | |
if (bits < 0 || bits > 32) { | |
__set_errno (EINVAL); | |
return (NULL); | |
} | |
if (bits == 0) { | |
if (size < sizeof "0") | |
goto emsgsize; | |
*dst++ = '0'; | |
size--; | |
*dst = '\0'; | |
} | |
/* Format whole octets. */ | |
for (b = bits / 8; b > 0; b--) { | |
if (size < sizeof "255.") | |
goto emsgsize; | |
t = dst; | |
dst += SPRINTF((dst, "%u", *src++)); | |
if (b > 1) { | |
*dst++ = '.'; | |
*dst = '\0'; | |
} | |
size -= (size_t)(dst - t); | |
} | |
/* Format partial octet. */ | |
b = bits % 8; | |
if (b > 0) { | |
if (size < sizeof ".255") | |
goto emsgsize; | |
t = dst; | |
if (dst != odst) | |
*dst++ = '.'; | |
m = ((1 << b) - 1) << (8 - b); | |
dst += SPRINTF((dst, "%u", *src & m)); | |
size -= (size_t)(dst - t); | |
} | |
/* Format CIDR /width. */ | |
if (size < sizeof "/32") | |
goto emsgsize; | |
dst += SPRINTF((dst, "/%u", bits)); | |
return (odst); | |
emsgsize: | |
__set_errno (EMSGSIZE); | |
return (NULL); | |
} |