Yonggang Luo
b4bc23078a
Notable changes: - Remove the comments in port impl, that's easily getting to in-consistence - Sync the jerryscript-port.h and 05.PORT-API.md - Fixes the invalid comment in port codes JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com
121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/* Copyright JS Foundation and other contributors, http://js.foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "jerryscript-port.h"
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#if defined(_WIN32)
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#include <windows.h>
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#include <time.h>
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#include <winbase.h>
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#include <winnt.h>
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#define UNIX_EPOCH_IN_TICKS 116444736000000000ull /* difference between 1970 and 1601 */
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#define TICKS_PER_MS 10000ull /* 1 tick is 100 nanoseconds */
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/*
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* If you take the limit of SYSTEMTIME (last millisecond in 30827) then you end up with
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* a FILETIME of 0x7fff35f4f06c58f0 by using SystemTimeToFileTime(). However, if you put
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* 0x7fffffffffffffff into FileTimeToSystemTime() then you will end up in the year 30828,
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* although this date is invalid for SYSTEMTIME. Any larger value (0x8000000000000000 and above)
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* causes FileTimeToSystemTime() to fail.
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* https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-systemtime
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* https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-filetime
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*/
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#define UNIX_EPOCH_DATE_1601_01_02 -11644387200000LL /* unit: ms */
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#define UNIX_EPOCH_DATE_30827_12_29 9106702560000000LL /* unit: ms */
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/**
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* Convert unix time to a FILETIME value.
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*
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* https://support.microsoft.com/en-us/help/167296/how-to-convert-a-unix-time-t-to-a-win32-filetime-or-systemtime
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*/
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static void
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unix_time_to_filetime (double t, LPFILETIME ft_p)
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{
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LONGLONG ll = (LONGLONG) t * TICKS_PER_MS + UNIX_EPOCH_IN_TICKS;
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/* FILETIME values before the epoch are invalid. */
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if (ll < 0)
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{
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ll = 0;
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}
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ft_p->dwLowDateTime = (DWORD) ll;
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ft_p->dwHighDateTime = (DWORD) (ll >> 32);
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} /* unix_time_to_filetime */
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/**
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* Convert a FILETIME to a unix time value.
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*
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* @return unix time
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*/
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static double
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filetime_to_unix_time (LPFILETIME ft_p)
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{
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ULARGE_INTEGER date;
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date.HighPart = ft_p->dwHighDateTime;
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date.LowPart = ft_p->dwLowDateTime;
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return (double) (((LONGLONG) date.QuadPart - UNIX_EPOCH_IN_TICKS) / TICKS_PER_MS);
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} /* filetime_to_unix_time */
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int32_t
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jerry_port_local_tza (double unix_ms)
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{
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FILETIME utc;
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FILETIME local;
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SYSTEMTIME utc_sys;
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SYSTEMTIME local_sys;
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/*
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* If the time is earlier than the date 1601-01-02, then always using date 1601-01-02 to
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* query time zone adjustment. This date (1601-01-02) will make sure both UTC and local
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* time succeed with Win32 API. The date 1601-01-01 may lead to a win32 api failure, as
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* after converting between local time and utc time, the time may be earlier than 1601-01-01
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* in UTC time, that exceeds the FILETIME representation range.
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*/
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if (unix_ms < (double) UNIX_EPOCH_DATE_1601_01_02)
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{
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unix_ms = (double) UNIX_EPOCH_DATE_1601_01_02;
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}
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/* Like above, do not use the last supported day */
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if (unix_ms > (double) UNIX_EPOCH_DATE_30827_12_29)
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{
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unix_ms = (double) UNIX_EPOCH_DATE_30827_12_29;
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}
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unix_time_to_filetime (unix_ms, &utc);
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if (FileTimeToSystemTime (&utc, &utc_sys) && SystemTimeToTzSpecificLocalTime (NULL, &utc_sys, &local_sys)
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&& SystemTimeToFileTime (&local_sys, &local))
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{
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double unix_local = filetime_to_unix_time (&local);
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return (int32_t) (unix_local - unix_ms);
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}
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return 0;
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} /* jerry_port_local_tza */
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double
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jerry_port_current_time (void)
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{
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FILETIME ft;
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GetSystemTimeAsFileTime (&ft);
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return filetime_to_unix_time (&ft);
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} /* jerry_port_current_time */
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#endif /* defined(_WIN32) */
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