mirror of
https://github.com/jerryscript-project/jerryscript.git
synced 2025-12-15 16:29:21 +00:00
87d30b8088
In the non-Windows code paths: - New approach to compute TZA without the need for GNU-specific `struct tm.tm_gmtoff`. - Always using `usleep` to sleep. (No real need for `nanosleep` as port API has sleep granularity of milliseconds.) - Not checking for "time.h" at build configuration time as that header is mandated by the C standard. - Not checking for "unistd.h" at build configuration time as that header is mandated by the POSIX standard (the default port is targeting POSIX systems -- and Windows). - Fixing some macro guards. JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
140 lines
4.3 KiB
C
140 lines
4.3 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 <time.h>
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#ifdef _WIN32
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#include <windows.h>
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#include <winbase.h>
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#include <winnt.h>
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#endif /* _WIN32 */
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#if defined (__GNUC__) || defined (__clang__)
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#include <sys/time.h>
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#endif /* __GNUC__ || __clang__ */
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#include "jerryscript-port.h"
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#include "jerryscript-port-default.h"
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#ifdef _WIN32
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static const LONGLONG UnixEpochInTicks = 116444736000000000; /* difference between 1970 and 1601 */
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static const LONGLONG TicksPerMs = 10000; /* 1 tick is 100 nanoseconds */
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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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static void UnixTimeMsToFileTime (double t, LPFILETIME pft)
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{
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LONGLONG ll = (LONGLONG) t * TicksPerMs + UnixEpochInTicks;
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pft->dwLowDateTime = (DWORD) ll;
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pft->dwHighDateTime = (DWORD) (ll >> 32);
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} /* UnixTimeMsToFileTime */
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static double FileTimeToUnixTimeMs (FILETIME ft)
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{
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ULARGE_INTEGER date;
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date.HighPart = ft.dwHighDateTime;
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date.LowPart = ft.dwLowDateTime;
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return (double) (((LONGLONG) date.QuadPart - UnixEpochInTicks) / TicksPerMs);
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} /* FileTimeToUnixTimeMs */
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#endif /* _WIN32 */
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/**
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* Default implementation of jerry_port_get_local_time_zone_adjustment.
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*
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* @return offset between UTC and local time at the given unix timestamp, if
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* available. Otherwise, returns 0, assuming UTC time.
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*/
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double jerry_port_get_local_time_zone_adjustment (double unix_ms, /**< ms since unix epoch */
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bool is_utc) /**< is the time above in UTC? */
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{
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#ifdef _WIN32
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FILETIME fileTime, localFileTime;
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SYSTEMTIME systemTime, localSystemTime;
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ULARGE_INTEGER time, localTime;
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UnixTimeMsToFileTime (unix_ms, &fileTime);
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if (FileTimeToSystemTime (&fileTime, &systemTime)
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&& SystemTimeToTzSpecificLocalTime (0, &systemTime, &localSystemTime)
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&& SystemTimeToFileTime (&localSystemTime, &localFileTime))
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{
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time.LowPart = fileTime.dwLowDateTime;
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time.HighPart = fileTime.dwHighDateTime;
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localTime.LowPart = localFileTime.dwLowDateTime;
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localTime.HighPart = localFileTime.dwHighDateTime;
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return (double) (((LONGLONG) localTime.QuadPart - (LONGLONG) time.QuadPart) / TicksPerMs);
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}
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#elif defined (__GNUC__) || defined (__clang__)
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time_t now_time = (time_t) (unix_ms / 1000);
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double tza_s = 0.0;
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while (true)
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{
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struct tm now_tm;
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if (!gmtime_r (&now_time, &now_tm))
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{
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break;
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}
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now_tm.tm_isdst = -1; /* if not overridden, DST will not be taken into account */
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time_t local_time = mktime (&now_tm);
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if (local_time == (time_t) -1)
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{
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break;
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}
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tza_s = difftime (now_time, local_time);
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if (is_utc)
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{
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break;
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}
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now_time -= (time_t) tza_s;
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is_utc = true;
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}
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return tza_s * 1000;
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#else /* !_WIN32 && !__GNUC__ && !__clang__ */
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(void) unix_ms; /* unused */
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(void) is_utc; /* unused */
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return 0.0;
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#endif /* _WIN32 */
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} /* jerry_port_get_local_time_zone_adjustment */
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/**
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* Default implementation of jerry_port_get_current_time. Uses 'gettimeofday' if
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* available on the system, does nothing otherwise.
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*
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* @return milliseconds since Unix epoch - if 'gettimeofday' is available and
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* executed successfully,
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* 0 - otherwise.
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*/
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double jerry_port_get_current_time (void)
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{
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#ifdef _WIN32
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FILETIME ft;
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GetSystemTimeAsFileTime (&ft);
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return FileTimeToUnixTimeMs (ft);
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#elif defined (__GNUC__) || defined (__clang__)
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struct timeval tv;
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if (gettimeofday (&tv, NULL) == 0)
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{
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return ((double) tv.tv_sec) * 1000.0 + ((double) tv.tv_usec) / 1000.0;
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}
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return 0.0;
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#else /* !_WIN32 && !__GNUC__ && !__clang__ */
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return 0.0;
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#endif /* _WIN32 */
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} /* jerry_port_get_current_time */
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