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1 | /* Convert UTC calendar time to simple time. Like mktime but assumes UTC. |
2 | ||
3 | Copyright (C) 1994, 1997, 2003 Free Software Foundation, Inc. | |
fd26970f | 4 | This file is part of the GNU C Library. |
28f540f4 | 5 | |
fd26970f | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 10 | |
fd26970f UD |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
28f540f4 | 15 | |
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16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
28f540f4 | 20 | |
7683e140 RM |
21 | #ifdef HAVE_CONFIG_H |
22 | # include <config.h> | |
23 | #endif | |
24 | ||
25 | #ifdef _LIBC | |
26 | # include <time.h> | |
27 | #else | |
28 | # include "timegm.h" | |
29 | ||
30 | /* Portable standalone applications should supply a "time_r.h" that | |
31 | declares a POSIX-compliant gmtime_r, for the benefit of older | |
32 | implementations that lack gmtime_r or have a nonstandard one. | |
33 | See the gnulib time_r module for one way to implement this. */ | |
34 | # include <time_r.h> | |
35 | # undef __gmtime_r | |
36 | # define __gmtime_r gmtime_r | |
37 | time_t __mktime_internal (struct tm *, | |
38 | struct tm * (*) (time_t const *, struct tm *), | |
39 | time_t *); | |
40 | #endif | |
28f540f4 RM |
41 | |
42 | time_t | |
7683e140 | 43 | timegm (struct tm *tmp) |
28f540f4 | 44 | { |
80fd7387 | 45 | static time_t gmtime_offset; |
28f540f4 | 46 | tmp->tm_isdst = 0; |
80fd7387 | 47 | return __mktime_internal (tmp, __gmtime_r, &gmtime_offset); |
28f540f4 | 48 | } |