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20aa5819 | 1 | /* Internals of mktime and related functions |
2b778ceb | 2 | Copyright 2016-2021 Free Software Foundation, Inc. |
20aa5819 PE |
3 | This file is part of the GNU C Library. |
4 | Contributed by Paul Eggert <eggert@cs.ucla.edu>. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <https://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef _LIBC | |
21 | # include <time.h> | |
22 | #endif | |
23 | ||
24 | /* mktime_offset_t is a signed type wide enough to hold a UTC offset | |
25 | in seconds, and used as part of the type of the offset-guess | |
26 | argument to mktime_internal. In Glibc, it is always long int. | |
27 | When in Gnulib, use time_t on platforms where time_t | |
28 | is signed, to be compatible with platforms like BeOS that export | |
29 | this implementation detail of mktime. On platforms where time_t is | |
30 | unsigned, GNU and POSIX code can assume 'int' is at least 32 bits | |
31 | which is wide enough for a UTC offset. */ | |
32 | #ifdef _LIBC | |
e1080e7e | 33 | typedef long int mktime_offset_t; |
20aa5819 PE |
34 | #elif defined TIME_T_IS_SIGNED |
35 | typedef time_t mktime_offset_t; | |
36 | #else | |
37 | typedef int mktime_offset_t; | |
38 | #endif | |
39 | ||
40 | /* The source code uses identifiers like __time64_t for glibc | |
41 | timestamps that can contain 64-bit values even when time_t is only | |
42 | 32 bits. These are just macros for the ordinary identifiers unless | |
43 | compiling within glibc when time_t is 32 bits. */ | |
44 | #if ! (defined _LIBC && __TIMESIZE != 64) | |
45 | # undef __time64_t | |
46 | # define __time64_t time_t | |
47 | # define __gmtime64_r __gmtime_r | |
48 | # define __localtime64_r __localtime_r | |
49 | # define __mktime64 mktime | |
50 | # define __timegm64 timegm | |
51 | #endif | |
52 | ||
53 | #ifndef _LIBC | |
54 | ||
55 | /* Although glibc source code uses leading underscores, Gnulib wants | |
56 | ordinary names. | |
57 | ||
58 | Portable standalone applications should supply a <time.h> that | |
59 | declares a POSIX-compliant localtime_r, for the benefit of older | |
60 | implementations that lack localtime_r or have a nonstandard one. | |
61 | Similarly for gmtime_r. See the gnulib time_r module for one way | |
62 | to implement this. */ | |
63 | ||
64 | # undef __gmtime_r | |
65 | # undef __localtime_r | |
66 | # define __gmtime_r gmtime_r | |
67 | # define __localtime_r localtime_r | |
68 | ||
69 | # define __mktime_internal mktime_internal | |
70 | ||
71 | #endif | |
72 | ||
73 | /* Subroutine of mktime. Return the time_t representation of TP and | |
74 | normalize TP, given that a struct tm * maps to a time_t as performed | |
75 | by FUNC. Record next guess for localtime-gmtime offset in *OFFSET. */ | |
76 | extern __time64_t __mktime_internal (struct tm *tp, | |
77 | struct tm *(*func) (__time64_t const *, | |
78 | struct tm *), | |
79 | mktime_offset_t *offset) attribute_hidden; |