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+/* Internals of mktime and related functions
+ Copyright 2016-2022 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 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
+ <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;