glibc/login/programs/xtmp.c

/* Copyright (C) 1997 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 Library General Public License as
   published by the Free Software Foundation; either version 2 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <utmp.h>

#include "xtmp.h"

/* Convert the entry XT to the new utmp format and store it in UT.
   Fields in UT that were not present in the old utmp format are
   initialized to zero.  */
void
xtmp_to_utmp (const struct xtmp *xtmp, struct utmp *utmp)
{
  memset (utmp, 0, sizeof (struct utmp));
#if _HAVE_XT_TYPE - 0
  utmp->ut_type = xtmp->xt_type;
#endif
#if _HAVE_XT_PID - 0
  utmp->ut_pid = xtmp->xt_pid;
#endif
  strncpy (utmp->ut_line, xtmp->xt_line, XT_LINESIZE);
#if _HAVE_XT_ID - 0
  strncpy (utmp->ut_id, xtmp->xt_id, sizeof xtmp->xt_id);
#endif
#if _HAVE_UT_TV - 0
  utmp->ut_tv.tv_sec = xtmp->xt_time;
#else
  utmp->ut_time = xtmp->xt_time;
#endif
  strncpy (utmp->ut_user, xtmp->xt_user, XT_NAMESIZE);
#if _HAVE_XT_HOST - 0
  strncpy (utmp->ut_host, xtmp->xt_host, XT_HOSTSIZE);
#endif
  utmp->ut_addr = xtmp->xt_addr;
}

/* Convert the entry UTMP to the old utmp format and store it in XTMP.  */
void
utmp_to_xtmp (const struct utmp *utmp, struct xtmp *xtmp)
{
  memset (xtmp, 0, sizeof (struct xtmp));
#if _HAVE_XT_TYPE - 0
  xtmp->xt_type = utmp->ut_type;
#endif
#if _HAVE_XT_PID - 0
  xtmp->xt_pid = utmp->ut_pid;
#endif
  strncpy (xtmp->xt_line, utmp->ut_line, XT_LINESIZE);
  xtmp->xt_line[XT_LINESIZE] = '\0';
#if _HAVE_XT_ID - 0
  strncpy (xtmp->xt_id, utmp->ut_id, sizeof xtmp->xt_id);
#endif
#if _HAVE_UT_TV - 0
  xtmp->xt_time = utmp->ut_tv.tv_sec;
#else
  xtmp->xt_time = utmp->ut_time;
#endif
  strncpy (xtmp->xt_user, utmp->ut_user, XT_NAMESIZE);
#if _HAVE_XT_HOST - 0
  strncpy (xtmp->xt_host, utmp->ut_host, XT_HOSTSIZE);
  xtmp->xt_host[XT_HOSTSIZE] = '\0';
#endif
  xtmp->xt_addr = utmp->ut_addr;
}

/* Compare an old style entry XTMP with a new style entry UTMP.  The
   function returns 1 if the information that is in both old and new
   style entries is identical.  Otherwise this function returns 0.
   
   The type of the argument `xtmp' is `struct utmp *', not `struct
   utmp *'.  This is intentional!  We convert from and to `struct
   xtmp' directly when we read and write an old style entry.  But
   since XTMP is converted from an old style entry, we compare only
   those elements of the structure that are common to both the new and
   the old style entry.  */
int
compare_entry (const struct utmp *xtmp, const struct utmp *utmp)
{
  return
    (
#if _HAVE_XT_TYPE - 0
     xtmp->ut_type == utmp->ut_type
#endif
#if _HAVE_XT_PID - 0
     && xtmp->ut_pid == utmp->ut_pid
#endif
     && !strncmp (xtmp->ut_line, utmp->ut_line, XT_LINESIZE - 1)
#if _HAVE_XT_ID - 0
     && !strncmp (xtmp->ut_id, utmp->ut_id, sizeof utmp->ut_id)
#endif
#if _HAVE_UT_TV - 0
     && xtmp->ut_tv.tv_sec == utmp->ut_tv.tv_sec
#else
     && xtmp->ut_time == utmp->ut_time
#endif
     && !strncmp (xtmp->ut_user, utmp->ut_user, XT_NAMESIZE)
#if _HAVE_XT_HOST - 0
     && !strncmp (xtmp->ut_host, utmp->ut_host, XT_HOSTSIZE - 1)
#endif
     && xtmp->ut_addr == utmp->ut_addr);
}