NetBSD/sys/net/dl_print.c

89 lines
2.7 KiB
C

/* $NetBSD: dl_print.c,v 1.2 2014/12/02 19:34:33 christos Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#ifdef _KERNEL
__KERNEL_RCSID(0, "$NetBSD: dl_print.c,v 1.2 2014/12/02 19:34:33 christos Exp $");
#include <sys/systm.h>
#else
__RCSID("$NetBSD: dl_print.c,v 1.2 2014/12/02 19:34:33 christos Exp $");
#include <stdio.h>
static const uint8_t hexdigits[] = "0123456789abcdef";
#endif
#include <net/if_dl.h>
int
dl_print(char *buf, size_t len, const struct dl_addr *dl)
{
const uint8_t *ap = (const uint8_t *)dl->dl_data;
char abuf[256 * 3], *cp, *ecp;
ap += dl->dl_nlen;
cp = abuf;
ecp = abuf + sizeof(abuf);
#define ADDC(c) do { \
if (cp >= ecp) {\
cp++; \
} else \
*cp++ = (char)(c); \
} while (/*CONSTCOND*/0)
#define ADDX(v) do { \
uint8_t n = hexdigits[(v)]; \
ADDC(n); \
} while (/*CONSTCOND*/0)
for (size_t i = 0; i < dl->dl_alen; i++) {
ADDX((u_int)ap[i] >> 4);
ADDX(ap[i] & 0xf);
ADDC(':');
}
if (cp > abuf)
--cp;
if (ecp > abuf) {
if (cp < ecp)
*cp = '\0';
else
*--ecp = '\0';
}
return snprintf(buf, len, "%.*s/%hhu#%s",
(int)dl->dl_nlen, dl->dl_data, dl->dl_type, abuf);
}
int
sdl_print(char *buf, size_t len, const void *v)
{
const struct sockaddr_dl *sdl = v;
char abuf[LINK_ADDRSTRLEN];
dl_print(abuf, sizeof(abuf), &sdl->sdl_addr);
return snprintf(buf, len, "[%s]:%hu", abuf, sdl->sdl_index);
}