sysdeps/generic/utmp-equal.h

   1 /* Helper function for utmp functions to see if two entries are equal.
   2    Copyright (C) 1996-2024 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 }