login/programs/xtmp.c

   1 /* Copyright (C) 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <fcntl.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24 #include <utmp.h>
  25
  26 #include "xtmp.h"
  27
  28 /* Convert the entry XT to the new utmp format and store it in UT.
  29    Fields in UT that were not present in the old utmp format are
  30    initialized to zero.  */
  31 void
  32 xtmp_to_utmp (const struct xtmp *xtmp, struct utmp *utmp)
  33 {
  34   memset (utmp, 0, sizeof (struct utmp));
  35 #if _HAVE_XT_TYPE - 0
  36   utmp->ut_type = xtmp->xt_type;
  37 #endif
  38 #if _HAVE_XT_PID - 0
  39   utmp->ut_pid = xtmp->xt_pid;
  40 #endif
  41   strncpy (utmp->ut_line, xtmp->xt_line, XT_LINESIZE);
  42 #if _HAVE_XT_ID - 0
  43   strncpy (utmp->ut_id, xtmp->xt_id, sizeof xtmp->xt_id);
  44 #endif
  45 #if _HAVE_UT_TV - 0
  46   utmp->ut_tv.tv_sec = xtmp->xt_time;
  47 #else
  48   utmp->ut_time = xtmp->xt_time;
  49 #endif
  50   strncpy (utmp->ut_user, xtmp->xt_user, XT_NAMESIZE);
  51 #if _HAVE_XT_HOST - 0
  52   strncpy (utmp->ut_host, xtmp->xt_host, XT_HOSTSIZE);
  53 #endif
  54   utmp->ut_addr = xtmp->xt_addr;
  55 }
  56
  57 /* Convert the entry UTMP to the old utmp format and store it in XTMP.  */
  58 void
  59 utmp_to_xtmp (const struct utmp *utmp, struct xtmp *xtmp)
  60 {
  61   memset (xtmp, 0, sizeof (struct xtmp));
  62 #if _HAVE_XT_TYPE - 0
  63   xtmp->xt_type = utmp->ut_type;
  64 #endif
  65 #if _HAVE_XT_PID - 0
  66   xtmp->xt_pid = utmp->ut_pid;
  67 #endif
  68   strncpy (xtmp->xt_line, utmp->ut_line, XT_LINESIZE);
  69   xtmp->xt_line[XT_LINESIZE] = '\0';
  70 #if _HAVE_XT_ID - 0
  71   strncpy (xtmp->xt_id, utmp->ut_id, sizeof xtmp->xt_id);
  72 #endif
  73 #if _HAVE_UT_TV - 0
  74   xtmp->xt_time = utmp->ut_tv.tv_sec;
  75 #else
  76   xtmp->xt_time = utmp->ut_time;
  77 #endif
  78   strncpy (xtmp->xt_user, utmp->ut_user, XT_NAMESIZE);
  79 #if _HAVE_XT_HOST - 0
  80   strncpy (xtmp->xt_host, utmp->ut_host, XT_HOSTSIZE);
  81   xtmp->xt_host[XT_HOSTSIZE] = '\0';
  82 #endif
  83   xtmp->xt_addr = utmp->ut_addr;
  84 }
  85
  86 /* Compare an old style entry XTMP with a new style entry UTMP.  The
  87    function returns 1 if the information that is in both old and new
  88    style entries is identical.  Otherwise this function returns 0.
  89
  90    The type of the argument `xtmp' is `struct utmp *', not `struct
  91    utmp *'.  This is intentional!  We convert from and to `struct
  92    xtmp' directly when we read and write an old style entry.  But
  93    since XTMP is converted from an old style entry, we compare only
  94    those elements of the structure that are common to both the new and
  95    the old style entry.  */
  96 int
  97 compare_entry (const struct utmp *xtmp, const struct utmp *utmp)
  98 {
  99   return
 100     (
 101 #if _HAVE_XT_TYPE - 0
 102      xtmp->ut_type == utmp->ut_type
 103 #endif
 104 #if _HAVE_XT_PID - 0
 105      && xtmp->ut_pid == utmp->ut_pid
 106 #endif
 107      && !strncmp (xtmp->ut_line, utmp->ut_line, XT_LINESIZE - 1)
 108 #if _HAVE_XT_ID - 0
 109      && !strncmp (xtmp->ut_id, utmp->ut_id, sizeof utmp->ut_id)
 110 #endif
 111 #if _HAVE_UT_TV - 0
 112      && xtmp->ut_tv.tv_sec == utmp->ut_tv.tv_sec
 113 #else
 114      && xtmp->ut_time == utmp->ut_time
 115 #endif
 116      && !strncmp (xtmp->ut_user, utmp->ut_user, XT_NAMESIZE)
 117 #if _HAVE_XT_HOST - 0
 118      && !strncmp (xtmp->ut_host, utmp->ut_host, XT_HOSTSIZE - 1)
 119 #endif
 120      && xtmp->ut_addr == utmp->ut_addr);
 121 }