RE: Windows Build Killer: lib/gettime.c

[Conrad T. Pino]

Hi Derek,

> From: Derek Robert Price
> 
> Please bring this up on the bug-gnulib@gnu.org mailing list.  They may
> know what we're missing or be interested in updating gettime.c to run
> on Windows.

OK.  There'll be a delay while I get subscribed.

In the meantime please see what "windows-NT/gettime.c" might be below.
Untested and the constants may be off but the logic should be correct.

> Derek

Conrad

/* gettime -- get the system clock
   Copyright (C) 2002, 2004 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* Written by Paul Eggert.  */
/* Revised for Win32 API by Conrad T. Pino */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "timespec.h"
#include <windows.h>

/* POSIX or Unix Epoch */
const static SYSTEMTIME s_ix_epoch =
{
        1970,   /* year */
        1,              /* month, Jan=1 */
        4,              /* day of week, Thursday=4 */
        1,              /* day of month */
        0,              /* hour */
        0,              /* minute */
        0,              /* second */
        0               /* millisecond */
};

typedef union
{
        FILETIME                f;
        ULARGE_INTEGER  u;
} FT_ULI;

static FT_ULI ix_epoch;

/* Get the system time.  */

int
gettime( struct timespec *ts )
{
        FT_ULI now;
        ULONGLONG diff_100_nsec;
        const static div_100_nsec = 10000000l;

        if ( ix_epoch.u.QuadPart == 0 )
        {
                SystemTimeToFileTime( &s_ix_epoch, &ix_epoch.f );
        }

        GetSystemTimeAsFileTime( &now.f );

        /* FILETIME unit is 100 nanoseconds */

        diff_100_nsec = now.u.QuadPart - ix_epoch.u.QuadPart;

        ts->tv_sec = (time_t) ( diff_100_nsec / div_100_nsec );
        ts->tv_nsec = (long) ( ( diff_100_nsec % div_100_nsec ) * 100l );
        return 0;
}