/*
 * C11 <time.h> implementation
 *
 * (C) Copyright yohhoy 2012.
 * Copyright 2022 Yonggang Luo
 * Distributed under the Boost Software License, Version 1.0.
 *
 * Permission is hereby granted, free of charge, to any person or
 * organization obtaining a copy of the software and accompanying
 * documentation covered by this license (the "Software") to use,
 * reproduce, display, distribute, execute, and transmit the Software,
 * and to prepare [[derivative work]]s of the Software, and to permit
 * third-parties to whom the Software is furnished to do so, all
 * subject to the following:
 *
 * The copyright notices in the Software and this entire statement,
 * including the above license grant, this restriction and the
 * following disclaimer, must be included in all copies of the
 * Software, in whole or in part, and all derivative works of the
 * Software, unless such copies or derivative works are solely in the
 * form of machine-executable object code generated by a source
 * language processor.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR ANYONE
 * DISTRIBUTING THE SOFTWARE BE LIABLE FOR ANY DAMAGES OR OTHER
 * LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#include "time.h"

#ifndef KIT_HAVE_TIMESPEC_GET

#  if defined(_WIN32) && !defined(__CYGWIN__)

#    ifndef WIN32_LEAN_AND_MEAN
#      define WIN32_LEAN_AND_MEAN 1
#    endif
#    include <windows.h>

int timespec_get(struct timespec *ts, int base) {
/* difference between 1970 and 1601 */
#    define _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS 116444736000000000ull
/* 1 tick is 100 nanoseconds */
#    define _TIMESPEC_IMPL_TICKS_PER_SECONDS 10000000ull
  if (!ts)
    return 0;
  if (base == TIME_UTC) {
    FILETIME       ft;
    ULARGE_INTEGER date;
    LONGLONG       ticks;

    GetSystemTimeAsFileTime(&ft);
    date.HighPart = ft.dwHighDateTime;
    date.LowPart  = ft.dwLowDateTime;
    ticks         = (LONGLONG) (date.QuadPart -
                        _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS);
    ts->tv_sec    = ticks / _TIMESPEC_IMPL_TICKS_PER_SECONDS;
    ts->tv_nsec   = (ticks % _TIMESPEC_IMPL_TICKS_PER_SECONDS) * 100;
    return base;
  }
  return 0;
#    undef _TIMESPEC_IMPL_UNIX_EPOCH_IN_TICKS
#    undef _TIMESPEC_IMPL_TICKS_PER_SECONDS
}

#  else

int timespec_get(struct timespec *ts, int base) {
  if (!ts)
    return 0;
  if (base == TIME_UTC) {
    clock_gettime(CLOCK_REALTIME, ts);
    return base;
  }
  return 0;
}
#  endif

#endif