sysdeps/generic/utmp-equal.h

   1 /* Helper function for utmp functions to see if two entries are equal.
   2    Copyright (C) 1996-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>
   5    and Paul Janzen <pcj@primenet.com>, 1996.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #include <string.h>
  22 #include <utmp.h>
  23
  24 #include "utmp-private.h"
  25
  26 /* Test whether two entries match.  */
  27 static int
  28 __utmp_equal (const struct utmp *entry, const struct utmp *match)
  29 {
  30   return
  31     (
  32 #if _HAVE_UT_TYPE - 0
  33      (entry->ut_type == INIT_PROCESS
  34       || entry->ut_type == LOGIN_PROCESS
  35       || entry->ut_type == USER_PROCESS
  36       || entry->ut_type == DEAD_PROCESS)
  37      &&
  38      (match->ut_type == INIT_PROCESS
  39       || match->ut_type == LOGIN_PROCESS
  40       || match->ut_type == USER_PROCESS
  41       || match->ut_type == DEAD_PROCESS)
  42      &&
  43 #endif
  44 #if _HAVE_UT_ID - 0
  45      (entry->ut_id[0] && match->ut_id[0]
  46       ? strncmp (entry->ut_id, match->ut_id, sizeof match->ut_id) == 0
  47       : strncmp (entry->ut_line, match->ut_line, sizeof match->ut_line) == 0)
  48 #else
  49      strncmp (entry->ut_line, match->ut_line, sizeof match->ut_line) == 0
  50 #endif
  51      );
  52 }