diff options
Diffstat (limited to 'lib/mktime-internal.h')
| -rw-r--r-- | lib/mktime-internal.h | 76 |
1 files changed, 59 insertions, 17 deletions
diff --git a/lib/mktime-internal.h b/lib/mktime-internal.h index 00e58abdd6c..170764eabc8 100644 --- a/lib/mktime-internal.h +++ b/lib/mktime-internal.h @@ -1,37 +1,79 @@ -/* mktime variant that also uses an offset guess +/* 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>. - Copyright 2016-2017 Free Software Foundation, Inc. - - This program is free software; you can redistribute it and/or - modify it under the terms of the GNU General Public + 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 3 of the License, or (at your option) any later version. + version 2.1 of the License, or (at your option) any later version. - This program is distributed in the hope that it will be useful, + 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. + Lesser General Public License for more details. - You should have received a copy of the GNU General Public - License along with this program; if not, see + 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/>. */ -#include <time.h> +#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. Use time_t on platforms where time_t + 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. */ - -#if TIME_T_IS_SIGNED +#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 -time_t mktime_internal (struct tm *, - struct tm * (*) (time_t const *, struct tm *), - mktime_offset_t *); +/* 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; |