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
timeval_add(struct timeval * result,const struct timeval * a,const struct timeval * b)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
timeval_sub(struct timeval * result,const struct timeval * a,const struct timeval * b)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