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gwtm2secs.c

/*
 * Copyright (c) 1992, 1993, 1995, 1996, 2000
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */
#ifndef lint
static const char rcsid[] =
    "@(#) $Id: gwtm2secs.c,v 1.6 2000/02/25 07:27:00 leres Exp $ (LBL)";
#endif

/*
 * gwtm2secs.c - convert "tm" structs for Greenwich time to Unix timestamp
 */

#include <sys/types.h>

#include <time.h>
#include <pcap.h>

#include "gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif

#include "tcpslice.h"

static int days_in_month[] =
      /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */
      {  31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

#define IS_LEAP_YEAR(year)    \
      (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0))

time_t gwtm2secs( struct tm *tm )
      {
      int i, days, year;

      year = tm->tm_year + 1900;
      days = 0;
      for ( i = 1970; i < year; ++i )
            {
            days += 365;
            if ( IS_LEAP_YEAR(i) )
                  ++days;
            }

      for ( i = 0; i < tm->tm_mon; ++i )
            days += days_in_month[i];

      if ( IS_LEAP_YEAR(year) && tm->tm_mon > 1 ) /* 1 is February */
            ++days;

      days += tm->tm_mday - 1; /* -1 since days are numbered starting at 1 */

      return days * 86400 + tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
      }

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