time/gmtime.c

   1 /* Copyright (C) 1991, 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <stddef.h>
  20 #include <time.h>
  21
  22 /* Defined in localtime.c.  */
  23 extern struct tm _tmbuf;
  24
  25 /* Return the `struct tm' representation of *T in UTC.  */
  26 struct tm *
  27 gmtime (t)
  28      const time_t *t;
  29 {
  30   return __gmtime_r (t, &_tmbuf);
  31 }
  32
  33
  34 /* Return the `struct tm' representation of *T in UTC,
  35    using *TP to store the result.  */
  36 struct tm *
  37 __gmtime_r (t, tp)
  38      const time_t *t;
  39      struct tm *tp;
  40 {
  41   __offtime (t, 0L, tp);
  42
  43   tp->tm_isdst = 0;
  44   tp->tm_gmtoff = 0L;
  45   tp->tm_zone = "GMT";
  46
  47   return tp;
  48 }
  49 weak_alias (__gmtime_r, gmtime_r)