time/gmtime.c

   1 /* Copyright (C) 1991, 1993, 1995 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
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <stddef.h>
  21 #include <time.h>
  22
  23 /* Defined in localtime.c.  */
  24 extern struct tm _tmbuf;
  25
  26 /* Return the `struct tm' representation of *T in UTC.  */
  27 struct tm *
  28 DEFUN(gmtime, (t), CONST time_t *t)
  29 {
  30   return __gmtime_r (t, &_tmbuf);
  31 }
  32
  33 /* Return the `struct tm' representation of *T in UTC,
  34    using *TP to store the result.  */
  35 struct tm *
  36 DEFUN(__gmtime_r, (t, tp),
  37       CONST time_t *t AND struct tm *tp)
  38 {
  39   __offtime (t, 0L, tp);
  40
  41   tp->tm_isdst = 0;
  42   tp->tm_gmtoff = 0L;
  43   tp->tm_zone = "GMT";
  44
  45   return tp;
  46 }
  47 weak_alias (__gmtime_r, gmtime_r)