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If sysctl kern.version returns a string that's too long
to fit in {struct utsname}.version then just use the
truncated value.

/*	$NetBSD: uname.c,v 1.12 2014/06/14 13:09:37 apb Exp $	*/

/*-
 * Copyright (c) 1994
 *	The Regents of the University of California.  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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)uname.c	8.1 (Berkeley) 1/4/94";
#else
__RCSID("$NetBSD: uname.c,v 1.12 2014/06/14 13:09:37 apb Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/utsname.h>

#include <assert.h>
#include <errno.h>

#ifdef __weak_alias
__weak_alias(uname,_uname)
#endif

int
uname(struct utsname *name)
{
	int mib[2];
	size_t len;
	char *p;

	_DIAGASSERT(name != NULL);

	mib[0] = CTL_KERN;
	mib[1] = KERN_OSTYPE;
	len = sizeof(name->sysname);
	if (sysctl(mib, 2, &name->sysname, &len, NULL, 0) == -1)
		goto error;

	mib[0] = CTL_KERN;
	mib[1] = KERN_HOSTNAME;
	len = sizeof(name->nodename);
	if (sysctl(mib, 2, &name->nodename, &len, NULL, 0) == -1)
		goto error;

	mib[0] = CTL_KERN;
	mib[1] = KERN_OSRELEASE;
	len = sizeof(name->release);
	if (sysctl(mib, 2, &name->release, &len, NULL, 0) == -1)
		goto error;

	mib[0] = CTL_KERN;
	mib[1] = KERN_VERSION;
	len = sizeof(name->version);
	if (sysctl(mib, 2, &name->version, &len, NULL, 0) == -1) {
		if (errno == ENOMEM) {
			/*
			 * string is too long for {struct utsname}.version.
			 * Just use the truncated string.
			 * XXX: We could mark the truncation with "..."
			 */
			name->version[sizeof(name->version) - 1] = '\0';
		}
		else goto error;
	}

	/* The version may have newlines in it, turn them into spaces. */
	for (p = name->version; len--; ++p) {
		if (*p == '\n' || *p == '\t') {
			if (len > 1)
				*p = ' ';
			else
				*p = '\0';
		}
	}

	mib[0] = CTL_HW;
	mib[1] = HW_MACHINE;
	len = sizeof(name->machine);
	if (sysctl(mib, 2, &name->machine, &len, NULL, 0) == -1)
		goto error;
	return (0);

error:
	return (-1);
}