time/localtime.c

   1 /* Convert `time_t' to `struct tm' in local time zone.
   2    Copyright (C) 1991, 92, 93, 95, 96, 97 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 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 <time.h>
  21
  22 /* The C Standard says that localtime and gmtime return the same pointer.  */
  23 struct tm _tmbuf;
  24
  25 /* Prototype for the internal function to get information based on TZ.  */
  26 extern struct tm *__tz_convert __P ((const time_t *t, int use_localtime,
  27                                      struct tm *tp));
  28
  29
  30
  31 /* Return the `struct tm' representation of *T in local time,
  32    using *TP to store the result.  */
  33 struct tm *
  34 __localtime_r (t, tp)
  35      const time_t *t;
  36      struct tm *tp;
  37 {
  38   return __tz_convert (t, 1, tp);
  39 }
  40 weak_alias (__localtime_r, localtime_r)
  41
  42
  43 /* Return the `struct tm' representation of *T in local time.  */
  44 struct tm *
  45 localtime (t)
  46      const time_t *t;
  47 {
  48   return __tz_convert (t, 1, &_tmbuf);
  49 }