/* utmpdump - dump utmp-like files.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <unistd.h>

#include <utmp.h>

static void

print_entry (struct utmp *up)

{

  /* Mixed 32-/64-bit systems may have timeval structs of different sixe

     but need struct utmp to be the same size.  So in 64-bit up->ut_tv may

     not be a timeval but a struct of __int32_t's.  This would cause a compile

     time warning and a formating error when 32-bit int is passed where

     a 64-bit long is expected. So copy up->up_tv to a temporary timeval.

     This is 32-/64-bit agnostic and expands the timeval fields to the

     expected size as needed. */

  struct timeval temp_tv;

  temp_tv.tv_sec = up->ut_tv.tv_sec;

  temp_tv.tv_usec = up->ut_tv.tv_usec;

  printf ("[%d] [%05d] [%-4.4s] [%-8.8s] [%-12.12s] [%-16.16s] [%-15.15s]"

	  " [%ld]\n",

	  up->ut_type, up->ut_pid, up->ut_id, up->ut_user, up->ut_line,

	  up->ut_host, 4 + ctime (&temp_tv.tv_sec),

	  (long int) temp_tv.tv_usec);

}

int

main (int argc, char *argv[])

{

  struct utmp *up;

  if (argc > 1)

    utmpname (argv[1]);

  setutent ();

  while ((up = getutent ()))

    print_entry (up);

  endutent ();

  return EXIT_SUCCESS;

}