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/* Basic struct timeval utilities.

   Copyright (C) 2011 Free Software Foundation, Inc.

This file is part of the libiberty library.

Libiberty is free software; you can redistribute it and/or

modify it under the terms of the GNU Library General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

Libiberty 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

Library General Public License for more details.

You should have received a copy of the GNU Library General Public

License along with libiberty; see the file COPYING.LIB.  If not,

write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,

Boston, MA 02110-1301, USA.  */

#include "config.h"

/* On some systems (such as WindISS), you must include <sys/types.h>

   to get the definition of "time_t" before you include <time.h>.  */

#include <sys/types.h>

#ifdef TIME_WITH_SYS_TIME

# include <sys/time.h>

# include <time.h>

#else

# if HAVE_SYS_TIME_H

#  include <sys/time.h>

# else

#  ifdef HAVE_TIME_H

#   include <time.h>

#  endif

# endif

#endif

#include "timeval-utils.h"

/*

@deftypefn Extension void timeval_add (struct timeval *@var{a}, @

  struct timeval *@var{b}, struct timeval *@var{result})

Adds @var{a} to @var{b} and stores the result in @var{result}.

@end deftypefn

*/

void

timeval_add (struct timeval *result,

             const struct timeval *a, const struct timeval *b)

{

  result->tv_sec = a->tv_sec + b->tv_sec;

  result->tv_usec = a->tv_usec + b->tv_usec;

  if (result->tv_usec >= 1000000)

    {

      ++result->tv_sec;

      result->tv_usec -= 1000000;

    }

}

/*

@deftypefn Extension void timeval_sub (struct timeval *@var{a}, @

  struct timeval *@var{b}, struct timeval *@var{result})

Subtracts @var{b} from @var{a} and stores the result in @var{result}.

@end deftypefn

*/

void

timeval_sub (struct timeval *result,

             const struct timeval *a, const struct timeval *b)

{

  result->tv_sec = a->tv_sec - b->tv_sec;

  result->tv_usec = a->tv_usec - b->tv_usec;

  if (result->tv_usec < 0)

    {

      --result->tv_sec;

      result->tv_usec += 1000000;

    }

}