mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 05:00:15 +00:00
80 lines
3.0 KiB
C
80 lines
3.0 KiB
C
/* Internals of mktime and related functions
|
|
Copyright 2016-2024 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;
|