summaryrefslogtreecommitdiff
path: root/time/timegm.c
blob: 50612cafd57cebadfe4fb2a2024b2c72f2f7c07e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
/* Convert UTC calendar time to simple time.  Like mktime but assumes UTC.

   Copyright (C) 1994-2015 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#ifdef _LIBC
# include <time.h>
#else
# include "timegm.h"

/* Portable standalone applications should supply a "time_r.h" that
   declares a POSIX-compliant gmtime_r, for the benefit of older
   implementations that lack gmtime_r or have a nonstandard one.
   See the gnulib time_r module for one way to implement this.  */
# include <time_r.h>
# undef __gmtime_r
# define __gmtime_r gmtime_r
time_t __mktime_internal (struct tm *,
			  struct tm * (*) (time_t const *, struct tm *),
			  time_t *);
#endif

time_t
timegm (struct tm *tmp)
{
  static time_t gmtime_offset;
  tmp->tm_isdst = 0;
  return __mktime_internal (tmp, __gmtime_r, &gmtime_offset);
}