1  /* Helper function for utmp functions to see if two entries are equal.
       2     Copyright (C) 1996-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library 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 the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <string.h>
      20  #include <utmp.h>
      21  
      22  #include "utmp-private.h"
      23  
      24  /* Test whether two entries match.  */
      25  static int
      26  __utmp_equal (const struct utmp *entry, const struct utmp *match)
      27  {
      28    return (entry->ut_type == INIT_PROCESS
      29            || entry->ut_type == LOGIN_PROCESS
      30            || entry->ut_type == USER_PROCESS
      31            || entry->ut_type == DEAD_PROCESS)
      32      && (match->ut_type == INIT_PROCESS
      33          || match->ut_type == LOGIN_PROCESS
      34          || match->ut_type == USER_PROCESS
      35          || match->ut_type == DEAD_PROCESS)
      36      && (entry->ut_id[0] && match->ut_id[0]
      37          ? strncmp (entry->ut_id, match->ut_id, sizeof match->ut_id) == 0
      38          : (strncmp (entry->ut_line, match->ut_line, sizeof match->ut_line)
      39             == 0));
      40  }