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48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/* Convert UTC calendar time to simple time. Like mktime but assumes UTC.
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Copyright (C) 1994-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef _LIBC
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# include <time.h>
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#else
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# include "timegm.h"
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/* Portable standalone applications should supply a "time_r.h" that
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declares a POSIX-compliant gmtime_r, for the benefit of older
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implementations that lack gmtime_r or have a nonstandard one.
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See the gnulib time_r module for one way to implement this. */
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# include <time_r.h>
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# undef __gmtime_r
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# define __gmtime_r gmtime_r
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time_t __mktime_internal (struct tm *,
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struct tm * (*) (time_t const *, struct tm *),
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time_t *);
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#endif
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time_t
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timegm (struct tm *tmp)
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{
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static time_t gmtime_offset;
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tmp->tm_isdst = 0;
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return __mktime_internal (tmp, __gmtime_r, &gmtime_offset);
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}
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