/*-
 * 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.
 *
 * @(#)uname.c  8.1 (Berkeley) 1/4/94
 * $FreeBSD: src/lib/libc/gen/uname.c,v 1.7 1999/08/27 23:59:06 peter Exp $
 */

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

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

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

        rval = 0;

        bzero(name->sysname, sizeof(name->sysname));
        if ((p = getenv("UNAME_s"))) {
                strlcpy(name->sysname, p, sizeof(name->sysname));
        } else {
                mib[0] = CTL_KERN;
                mib[1] = KERN_OSTYPE;
                len = sizeof(name->sysname);
                oerrno = errno;
                if (sysctl(mib, 2, name->sysname, &len, NULL, 0) == -1) {
                        if(errno == ENOMEM)
                                errno = oerrno;
                        else
                                rval = -1;
                }
                name->sysname[sizeof(name->sysname) - 1] = '\0';
        }

        bzero(name->nodename, sizeof(name->nodename));
        mib[0] = CTL_KERN;
        mib[1] = KERN_HOSTNAME;
        len = sizeof(name->nodename);
        oerrno = errno;
        if (sysctl(mib, 2, name->nodename, &len, NULL, 0) == -1) {
                if(errno == ENOMEM)
                        errno = oerrno;
                else
                        rval = -1;
        }
        name->nodename[sizeof(name->nodename) - 1] = '\0';

        if ((p = getenv("UNAME_r"))) {
                strlcpy(name->release, p, sizeof(name->release));
        } else {
                mib[0] = CTL_KERN;
                mib[1] = KERN_OSRELEASE;
                len = sizeof(name->release);
                oerrno = errno;
                if (sysctl(mib, 2, name->release, &len, NULL, 0) == -1) {
                        if(errno == ENOMEM)
                                errno = oerrno;
                        else
                                rval = -1;
                }
                name->release[sizeof(name->release) - 1] = '\0';
        }

        bzero(name->version, sizeof(name->version));
        if ((p = getenv("UNAME_v"))) {
                strlcpy(name->version, p, sizeof(name->version));
        } else {
                /* The version may contain newlines, turn them into spaces. */
                mib[0] = CTL_KERN;
                mib[1] = KERN_VERSION;
                len = sizeof(name->version);
                oerrno = errno;
                if (sysctl(mib, 2, name->version, &len, NULL, 0) == -1) {
                        if (errno == ENOMEM)
                                errno = oerrno;
                        else
                                rval = -1;
                }
                name->version[sizeof(name->version) - 1] = '\0';
                for (p = name->version; len--; ++p) {
                        if (*p == '\n' || *p == '\t') {
                                if (len > 1)
                                        *p = ' ';
                                else
                                        *p = '\0';
                        }
                }
        }

        bzero(name->machine, sizeof(name->machine));
        if ((p = getenv("UNAME_m"))) {
                strlcpy(name->machine, p, sizeof(name->machine));
        } else {
                oerrno = errno;
                mib[1] = HW_MACHINE;
                mib[0] = CTL_HW;
                len = sizeof(name->machine);
                if (sysctl(mib, 2, name->machine, &len, NULL, 0) == -1) {
                        if (errno == ENOMEM) {
                                errno = oerrno;
                        } else {
                                rval = -1;
                        }
                }
                name->machine[sizeof(name->machine) - 1] = '\0';
        }
        return (rval);
}