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  1. /* Basic struct timeval utilities.
  2.    Copyright (C) 2011 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. }
  88.