xref: /third_party/mesa3d/src/c11/impl/time.c (revision bf215546)
1/*
2 * C11 <time.h> implementation
3 *
4 * (C) Copyright yohhoy 2012.
5 * Copyright 2022 Yonggang Luo
6 * Distributed under the Boost Software License, Version 1.0.
7 *
8 * Permission is hereby granted, free of charge, to any person or organization
9 * obtaining a copy of the software and accompanying documentation covered by
10 * this license (the "Software") to use, reproduce, display, distribute,
11 * execute, and transmit the Software, and to prepare [[derivative work]]s of the
12 * Software, and to permit third-parties to whom the Software is furnished to
13 * do so, all subject to the following:
14 *
15 * The copyright notices in the Software and this entire statement, including
16 * the above license grant, this restriction and the following disclaimer,
17 * must be included in all copies of the Software, in whole or in part, and
18 * all derivative works of the Software, unless such copies or derivative
19 * works are solely in the form of machine-executable object code generated by
20 * a source language processor.
21 *
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
25 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
26 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
28 * DEALINGS IN THE SOFTWARE.
29 */
30
31#include "c11/time.h"
32
33#ifndef HAVE_TIMESPEC_GET
34
35#if defined(_WIN32) && !defined(__CYGWIN__)
36
37#ifndef WIN32_LEAN_AND_MEAN
38#define WIN32_LEAN_AND_MEAN 1
39#endif
40#include <windows.h>
41
42int
43timespec_get(struct timespec *ts, int base)
44{
45/* difference between 1970 and 1601 */
46#define _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS 116444736000000000ull
47/* 1 tick is 100 nanoseconds */
48#define _TIMESPEC_IMPL_TICKS_PER_SECONDS 10000000ull
49    if (!ts)
50        return 0;
51    if (base == TIME_UTC) {
52        FILETIME ft;
53        ULARGE_INTEGER date;
54        LONGLONG ticks;
55
56        GetSystemTimeAsFileTime(&ft);
57        date.HighPart = ft.dwHighDateTime;
58        date.LowPart = ft.dwLowDateTime;
59        ticks = (LONGLONG)(date.QuadPart - _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS);
60        ts->tv_sec = ticks / _TIMESPEC_IMPL_TICKS_PER_SECONDS;
61        ts->tv_nsec = (ticks % _TIMESPEC_IMPL_TICKS_PER_SECONDS) * 100;
62        return base;
63    }
64    return 0;
65#undef _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS
66#undef _TIMESPEC_IMPL_TICKS_PER_SECONDS
67}
68
69#else
70
71int
72timespec_get(struct timespec *ts, int base)
73{
74    if (!ts)
75        return 0;
76    if (base == TIME_UTC) {
77        clock_gettime(CLOCK_REALTIME, ts);
78        return base;
79    }
80    return 0;
81}
82#endif
83
84#endif /* !HAVE_TIMESPEC_GET */
85