#if defined(LIBC_SCCS) && !defined(lint)
static const char orig_rcsid[] = "From Id: inet_net_ntop.c,v 8.2 1996/08/08 06:54:44 vixie Exp";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/net/inet_net_ntop.c,v 1.7 2002/03/22 21:52:29 obrien Exp $");
#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(sprintfx)
#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);
char *
inet_net_ntop(af, src, bits, dst, size)
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:
errno = EAFNOSUPPORT;
return (NULL);
}
}
static char *
inet_net_ntop_ipv4(src, bits, dst, size)
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) {
errno = EINVAL;
return (NULL);
}
if (bits == 0) {
if (size < sizeof "0")
goto emsgsize;
*dst++ = '0';
*dst = '\0';
}
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);
}
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);
}
if (size < sizeof "/32")
goto emsgsize;
dst += SPRINTF((dst, "/%u", bits));
return (odst);
emsgsize:
errno = EMSGSIZE;
return (NULL);
}
#undef inet_net_ntop
__weak_reference(__inet_net_ntop, inet_net_ntop);