| 1 | /* Internals of mktime and related functions |
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| 2 | Copyright 2016-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | Contributed by Paul Eggert <eggert@cs.ucla.edu>. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, see |
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| 18 | <https://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | #ifndef _LIBC |
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| 21 | # include <time.h> |
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| 22 | #endif |
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| 23 | |
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| 24 | /* mktime_offset_t is a signed type wide enough to hold a UTC offset |
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| 25 | in seconds, and used as part of the type of the offset-guess |
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| 26 | argument to mktime_internal. In Glibc, it is always long int. |
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| 27 | When in Gnulib, use time_t on platforms where time_t |
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| 28 | is signed, to be compatible with platforms like BeOS that export |
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| 29 | this implementation detail of mktime. On platforms where time_t is |
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| 30 | unsigned, GNU and POSIX code can assume 'int' is at least 32 bits |
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| 31 | which is wide enough for a UTC offset. */ |
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| 32 | #ifdef _LIBC |
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| 33 | typedef long int mktime_offset_t; |
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| 34 | #elif defined TIME_T_IS_SIGNED |
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| 35 | typedef time_t mktime_offset_t; |
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| 36 | #else |
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| 37 | typedef int mktime_offset_t; |
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| 38 | #endif |
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| 39 | |
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| 40 | /* The source code uses identifiers like __time64_t for glibc |
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| 41 | timestamps that can contain 64-bit values even when time_t is only |
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| 42 | 32 bits. These are just macros for the ordinary identifiers unless |
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| 43 | compiling within glibc when time_t is 32 bits. */ |
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| 44 | #if ! (defined _LIBC && __TIMESIZE != 64) |
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| 45 | # undef __time64_t |
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| 46 | # define __time64_t time_t |
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| 47 | # define __gmtime64_r __gmtime_r |
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| 48 | # define __localtime64_r __localtime_r |
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| 49 | # define __mktime64 mktime |
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| 50 | # define __timegm64 timegm |
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| 51 | #endif |
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| 52 | |
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| 53 | #ifndef _LIBC |
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| 54 | |
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| 55 | /* Although glibc source code uses leading underscores, Gnulib wants |
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| 56 | ordinary names. |
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| 57 | |
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| 58 | Portable standalone applications should supply a <time.h> that |
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| 59 | declares a POSIX-compliant localtime_r, for the benefit of older |
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| 60 | implementations that lack localtime_r or have a nonstandard one. |
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| 61 | Similarly for gmtime_r. See the gnulib time_r module for one way |
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| 62 | to implement this. */ |
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| 63 | |
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| 64 | # undef __gmtime_r |
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| 65 | # undef __localtime_r |
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| 66 | # define __gmtime_r gmtime_r |
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| 67 | # define __localtime_r localtime_r |
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| 68 | |
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| 69 | # define __mktime_internal mktime_internal |
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| 70 | |
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| 71 | #endif |
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| 72 | |
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| 73 | /* Subroutine of mktime. Return the time_t representation of TP and |
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| 74 | normalize TP, given that a struct tm * maps to a time_t as performed |
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| 75 | by FUNC. Record next guess for localtime-gmtime offset in *OFFSET. */ |
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| 76 | extern __time64_t __mktime_internal (struct tm *tp, |
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| 77 | struct tm *(*func) (__time64_t const *, |
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| 78 | struct tm *), |
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| 79 | mktime_offset_t *offset) attribute_hidden; |
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| 80 | |
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