/* Internals of mktime and related functions

   Copyright 2016-2020 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Paul Eggert <eggert@cs.ucla.edu>.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU General Public

   License as published by the Free Software Foundation; either

   version 3 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

   General Public License for more details.

   You should have received a copy of the GNU General Public

   License along with the GNU C Library; if not, see

   <https://www.gnu.org/licenses/>.  */

#ifndef _LIBC

# include <time.h>

#endif

/* mktime_offset_t is a signed type wide enough to hold a UTC offset

   in seconds, and used as part of the type of the offset-guess

   argument to mktime_internal.  In Glibc, it is always long int.

   When in Gnulib, use time_t on platforms where time_t

   is signed, to be compatible with platforms like BeOS that export

   this implementation detail of mktime.  On platforms where time_t is

   unsigned, GNU and POSIX code can assume 'int' is at least 32 bits

   which is wide enough for a UTC offset.  */

#ifdef _LIBC

typedef long int mktime_offset_t;

#elif defined TIME_T_IS_SIGNED

typedef time_t mktime_offset_t;

#else

typedef int mktime_offset_t;

#endif

/* The source code uses identifiers like __time64_t for glibc

   timestamps that can contain 64-bit values even when time_t is only

   32 bits.  These are just macros for the ordinary identifiers unless

   compiling within glibc when time_t is 32 bits.  */

#if ! (defined _LIBC && __TIMESIZE != 64)

# undef __time64_t

# define __time64_t time_t

# define __gmtime64_r __gmtime_r

# define __localtime64_r __localtime_r

# define __mktime64 mktime

# define __timegm64 timegm

#endif

#ifndef _LIBC

/* Although glibc source code uses leading underscores, Gnulib wants

   ordinary names.

   Portable standalone applications should supply a <time.h> that

   declares a POSIX-compliant localtime_r, for the benefit of older

   implementations that lack localtime_r or have a nonstandard one.

   Similarly for gmtime_r.  See the gnulib time_r module for one way

   to implement this.  */

# undef __gmtime_r

# undef __localtime_r

# define __gmtime_r gmtime_r

# define __localtime_r localtime_r

# define __mktime_internal mktime_internal

#endif

/* Subroutine of mktime.  Return the time_t representation of TP and

   normalize TP, given that a struct tm * maps to a time_t as performed

   by FUNC.  Record next guess for localtime-gmtime offset in *OFFSET.  */

extern __time64_t __mktime_internal (struct tm *tp,

                                     struct tm *(*func) (__time64_t const *,

                                                         struct tm *),

                                     mktime_offset_t *offset) attribute_hidden;