lib/tst_kvercmp.c

   1 /*
   2  *
   3  *   Copyright (c) International Business Machines  Corp., 2003
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 /*
  21  *
  22  *    AUTHOR
  23  *      Paul Larson <plars@linuxtestproject.org>
  24  *
  25  *    DESCRIPTION
  26  *      Compare a given kernel version against the current kernel version.
  27  *      If they are the same - return 0
  28  *      If the argument is > current kernel version - return positive int
  29  *      If the argument is < current kernel version - return negative int
  30  *
  31  */
  32
  33
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36 #include <string.h>
  37 #include <sys/utsname.h>
  38
  39 void get_kver(int *k1, int *k2, int *k3)
  40 {
  41         struct utsname uval;
  42         char *kver;
  43         char *r1, *r2, *r3;
  44 #if !defined(linux)
  45         extern char *strsep();          /* shut up some compilers */
  46 #endif
  47
  48         uname(&uval);
  49         kver = uval.release;
  50         r1 = strsep(&kver, ".");
  51         r2 = strsep(&kver, ".");
  52         r3 = strsep(&kver, ".");
  53
  54         *k1 = atoi(r1);
  55         *k2 = atoi(r2);
  56         *k3 = atoi(r3);
  57 }
  58
  59 int tst_kvercmp(int r1, int r2, int r3) {
  60         int a1, a2, a3;
  61         int testver, currver;
  62
  63         get_kver(&a1, &a2, &a3);
  64         testver = (r1 << 16) + (r2 << 8) + r3;
  65         currver = (a1 << 16) + (a2 << 8) + a3;
  66
  67         return currver - testver;
  68 }