/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * $Id: timeval.c,v 1.23 2004/04/09 09:36:31 bagder Exp $
 ***************************************************************************/

#include "timeval.h"

#ifndef HAVE_GETTIMEOFDAY

#ifdef WIN32
#include <mmsystem.h>

static int gettimeofday( struct timeval *tp, void *nothing ) {
#ifdef WITHOUT_MM_LIB
	SYSTEMTIME st;
	time_t tt;
	struct tm tmtm;
	/* mktime converts local to UTC */
	GetLocalTime( &st );
	tmtm.tm_sec = st.wSecond;
	tmtm.tm_min = st.wMinute;
	tmtm.tm_hour = st.wHour;
	tmtm.tm_mday = st.wDay;
	tmtm.tm_mon = st.wMonth - 1;
	tmtm.tm_year = st.wYear - 1900;
	tmtm.tm_isdst = -1;
	tt = mktime( &tmtm );
	tp->tv_sec = tt;
	tp->tv_usec = st.wMilliseconds * 1000;
#else
	/**
	 ** The earlier time calculations using GetLocalTime
	 ** had a time resolution of 10ms.The timeGetTime, part
	 ** of multimedia apis offer a better time resolution
	 ** of 1ms.Need to link against winmm.lib for this
	 **/
	unsigned long Ticks = 0;
	unsigned long Sec = 0;
	unsigned long Usec = 0;
	Ticks = timeGetTime();

	Sec = Ticks / 1000;
	Usec = ( Ticks - ( Sec * 1000 ) ) * 1000;
	tp->tv_sec = Sec;
	tp->tv_usec = Usec;
#endif /* WITHOUT_MM_LIB */
	(void)nothing;
	return 0;
}
#else /* WIN32 */
/* non-win32 version of Curl_gettimeofday() */
static int gettimeofday( struct timeval *tp, void *nothing ) {
	(void)nothing; /* we don't support specific time-zones */
	tp->tv_sec = (long)time( NULL );
	tp->tv_usec = 0;
	return 0;
}
#endif /* WIN32 */
#endif /* HAVE_GETTIMEOFDAY */

/* Return the current time in a timeval struct */
struct timeval curlx_tvnow( void ) {
	struct timeval now;
	(void)gettimeofday( &now, NULL );
	return now;
}

/*
 * Make sure that the first argument is the more recent time, as otherwise
 * we'll get a weird negative time-diff back...
 *
 * Returns: the time difference in number of milliseconds.
 */
long curlx_tvdiff( struct timeval newer, struct timeval older ) {
	return ( newer.tv_sec - older.tv_sec ) * 1000 +
		   ( newer.tv_usec - older.tv_usec ) / 1000;
}

/*
 * Same as curlx_tvdiff but with full usec resolution.
 *
 * Returns: the time difference in seconds with subsecond resolution.
 */
double curlx_tvdiff_secs( struct timeval newer, struct timeval older ) {
	return (double)( newer.tv_sec - older.tv_sec ) +
		   (double)( newer.tv_usec - older.tv_usec ) / 1000000.0;
}

/* return the number of seconds in the given input timeval struct */
long Curl_tvlong( struct timeval t1 ) {
	return t1.tv_sec;
}
