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1 /* Basic struct timeval utilities.
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145
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2 Copyright (C) 2011-2020 Free Software Foundation, Inc.
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111
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3
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4 This file is part of the libiberty library.
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5 Libiberty is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 Libiberty is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with libiberty; see the file COPYING.LIB. If not,
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17 write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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18 Boston, MA 02110-1301, USA. */
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19
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20 #include "config.h"
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21
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22 /* On some systems (such as WindISS), you must include <sys/types.h>
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23 to get the definition of "time_t" before you include <time.h>. */
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24 #include <sys/types.h>
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25
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26 #ifdef TIME_WITH_SYS_TIME
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27 # include <sys/time.h>
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28 # include <time.h>
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29 #else
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30 # if HAVE_SYS_TIME_H
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31 # include <sys/time.h>
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32 # else
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33 # ifdef HAVE_TIME_H
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34 # include <time.h>
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35 # endif
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36 # endif
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37 #endif
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38
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39 #include "timeval-utils.h"
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40
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41 /*
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42
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43 @deftypefn Extension void timeval_add (struct timeval *@var{a}, @
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44 struct timeval *@var{b}, struct timeval *@var{result})
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45
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46 Adds @var{a} to @var{b} and stores the result in @var{result}.
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47
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48 @end deftypefn
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49
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50 */
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51
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52 void
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53 timeval_add (struct timeval *result,
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54 const struct timeval *a, const struct timeval *b)
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55 {
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56 result->tv_sec = a->tv_sec + b->tv_sec;
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57 result->tv_usec = a->tv_usec + b->tv_usec;
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58 if (result->tv_usec >= 1000000)
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59 {
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60 ++result->tv_sec;
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61 result->tv_usec -= 1000000;
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62 }
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63 }
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64
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65 /*
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66
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67 @deftypefn Extension void timeval_sub (struct timeval *@var{a}, @
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68 struct timeval *@var{b}, struct timeval *@var{result})
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69
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70 Subtracts @var{b} from @var{a} and stores the result in @var{result}.
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71
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72 @end deftypefn
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73
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74 */
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75
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76 void
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77 timeval_sub (struct timeval *result,
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78 const struct timeval *a, const struct timeval *b)
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79 {
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80 result->tv_sec = a->tv_sec - b->tv_sec;
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81 result->tv_usec = a->tv_usec - b->tv_usec;
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82 if (result->tv_usec < 0)
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83 {
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84 --result->tv_sec;
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85 result->tv_usec += 1000000;
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86 }
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87 }
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