1  /* Basic struct timeval utilities.
       2     Copyright (C) 2011-2023 Free Software Foundation, Inc.
       3  
       4  This file is part of the libiberty library.
       5  Libiberty is free software; you can redistribute it and/or
       6  modify it under the terms of the GNU Library General Public
       7  License as published by the Free Software Foundation; either
       8  version 2 of the License, or (at your option) any later version.
       9  
      10  Libiberty is distributed in the hope that it will be useful,
      11  but WITHOUT ANY WARRANTY; without even the implied warranty of
      12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13  Library General Public License for more details.
      14  
      15  You should have received a copy of the GNU Library General Public
      16  License along with libiberty; see the file COPYING.LIB.  If not,
      17  write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
      18  Boston, MA 02110-1301, USA.  */
      19  
      20  #include "config.h"
      21  
      22  /* On some systems (such as WindISS), you must include <sys/types.h>
      23     to get the definition of "time_t" before you include <time.h>.  */
      24  #include <sys/types.h>
      25  
      26  #ifdef TIME_WITH_SYS_TIME
      27  # include <sys/time.h>
      28  # include <time.h>
      29  #else
      30  # if HAVE_SYS_TIME_H
      31  #  include <sys/time.h>
      32  # else
      33  #  ifdef HAVE_TIME_H
      34  #   include <time.h>
      35  #  endif
      36  # endif
      37  #endif
      38  
      39  #include "timeval-utils.h"
      40  
      41  /* 
      42  
      43  @deftypefn Extension void timeval_add (struct timeval *@var{a}, @
      44    struct timeval *@var{b}, struct timeval *@var{result})
      45  
      46  Adds @var{a} to @var{b} and stores the result in @var{result}.
      47  
      48  @end deftypefn
      49  
      50  */ 
      51  
      52  void
      53  timeval_add (struct timeval *result,
      54  	     const struct timeval *a, const struct timeval *b)
      55  {
      56    result->tv_sec = a->tv_sec + b->tv_sec;
      57    result->tv_usec = a->tv_usec + b->tv_usec;
      58    if (result->tv_usec >= 1000000)
      59      {
      60        ++result->tv_sec;
      61        result->tv_usec -= 1000000;
      62      }
      63  }
      64  
      65  /* 
      66  
      67  @deftypefn Extension void timeval_sub (struct timeval *@var{a}, @
      68    struct timeval *@var{b}, struct timeval *@var{result})
      69  
      70  Subtracts @var{b} from @var{a} and stores the result in @var{result}.
      71  
      72  @end deftypefn
      73  
      74  */ 
      75  
      76  void
      77  timeval_sub (struct timeval *result,
      78  	     const struct timeval *a, const struct timeval *b)
      79  {
      80    result->tv_sec = a->tv_sec - b->tv_sec;
      81    result->tv_usec = a->tv_usec - b->tv_usec;
      82    if (result->tv_usec < 0)
      83      {
      84        --result->tv_sec;
      85        result->tv_usec += 1000000;
      86      }
      87  }