ncurses/win32con/gettimeofday.c

/****************************************************************************
 * Copyright 2020,2023 Thomas E. Dickey                                     *
 * Copyright 2008-2010,2014 Free Software Foundation, Inc.                  *
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#ifdef WINVER
#  undef WINVER
#endif
#define WINVER 0x0501

#include <curses.priv.h>

#include <windows.h>

MODULE_ID("$Id: gettimeofday.c,v 1.7 2023/02/25 20:05:36 tom Exp $")

#if HAVE_GETTIMEOFDAY == 2
#define JAN1970 116444736000000000LL	/* the value for 01/01/1970 00:00 */

NCURSES_EXPORT(int)
gettimeofday(struct timeval *tv, void *tz GCC_UNUSED)
{
    union {
	FILETIME ft;
	long long since1601;	/* time since 1 Jan 1601 in 100ns units */
    } data;

    GetSystemTimeAsFileTime(&data.ft);
    tv->tv_usec = (long) ((data.since1601 / 10LL) % 1000000LL);
    tv->tv_sec = (long) ((data.since1601 - JAN1970) / 10000000LL);
    return (0);
}
#endif // HAVE_GETTIMEOFDAY == 2