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80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
/* Internals of mktime and related functions
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Copyright 2016-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Paul Eggert <eggert@cs.ucla.edu>.
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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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<https://www.gnu.org/licenses/>. */
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#ifndef _LIBC
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# include <time.h>
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#endif
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/* mktime_offset_t is a signed type wide enough to hold a UTC offset
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in seconds, and used as part of the type of the offset-guess
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argument to mktime_internal. In Glibc, it is always long int.
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When in Gnulib, use time_t on platforms where time_t
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is signed, to be compatible with platforms like BeOS that export
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this implementation detail of mktime. On platforms where time_t is
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unsigned, GNU and POSIX code can assume 'int' is at least 32 bits
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which is wide enough for a UTC offset. */
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#ifdef _LIBC
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typedef long int mktime_offset_t;
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#elif defined TIME_T_IS_SIGNED
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typedef time_t mktime_offset_t;
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#else
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typedef int mktime_offset_t;
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#endif
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/* The source code uses identifiers like __time64_t for glibc
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timestamps that can contain 64-bit values even when time_t is only
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32 bits. These are just macros for the ordinary identifiers unless
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compiling within glibc when time_t is 32 bits. */
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#if ! (defined _LIBC && __TIMESIZE != 64)
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# undef __time64_t
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# define __time64_t time_t
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# define __gmtime64_r __gmtime_r
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# define __localtime64_r __localtime_r
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# define __mktime64 mktime
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# define __timegm64 timegm
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#endif
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#ifndef _LIBC
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/* Although glibc source code uses leading underscores, Gnulib wants
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ordinary names.
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Portable standalone applications should supply a <time.h> that
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declares a POSIX-compliant localtime_r, for the benefit of older
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implementations that lack localtime_r or have a nonstandard one.
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Similarly for gmtime_r. See the gnulib time_r module for one way
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to implement this. */
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# undef __gmtime_r
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# undef __localtime_r
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# define __gmtime_r gmtime_r
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# define __localtime_r localtime_r
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# define __mktime_internal mktime_internal
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#endif
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/* Subroutine of mktime. Return the time_t representation of TP and
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normalize TP, given that a struct tm * maps to a time_t as performed
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by FUNC. Record next guess for localtime-gmtime offset in *OFFSET. */
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extern __time64_t __mktime_internal (struct tm *tp,
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struct tm *(*func) (__time64_t const *,
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struct tm *),
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mktime_offset_t *offset) attribute_hidden;
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