utils/wvtimeutils.cc

   1 /*
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2002 Net Integration Technologies, Inc.
   4  *
   5  * Various little time functions...
   6  */
   7 #include <limits.h>
   8
   9 #include "wvtimeutils.h"
  10
  11 time_t msecdiff(const WvTime &a, const WvTime &b)
  12 {
  13     long long secdiff = a.tv_sec - b.tv_sec;
  14     long long usecdiff = a.tv_usec - b.tv_usec;
  15     long long msecs = secdiff * 1000 + usecdiff / 1000;
  16
  17     time_t rval;
  18     if (msecs > INT_MAX)
  19         rval = INT_MAX;
  20     else if (msecs < INT_MIN)
  21         rval = INT_MIN;
  22     else
  23         rval = msecs;
  24     return rval;
  25 }
  26
  27
  28 WvTime wvtime()
  29 {
  30     struct timeval tv;
  31     gettimeofday(&tv, 0);
  32     return tv;
  33 }
  34
  35
  36 WvTime msecadd(const WvTime &a, time_t msec)
  37 {
  38     WvTime b;
  39     b.tv_sec = a.tv_sec + msec / 1000;
  40     b.tv_usec = a.tv_usec + (msec % 1000) * 1000;
  41     normalize(b);
  42     return b;
  43 }
  44
  45
  46 WvTime tvdiff(const WvTime &a, const WvTime &b)
  47 {
  48     WvTime c;
  49     c.tv_sec = a.tv_sec - b.tv_sec;
  50     c.tv_usec = a.tv_usec;
  51
  52     if (b.tv_usec > a.tv_usec)
  53     {
  54         c.tv_sec--;
  55         c.tv_usec += 1000000;
  56     }
  57
  58     c.tv_usec -= b.tv_usec;
  59
  60     normalize(c);
  61     return c;
  62 }
  63
  64
  65 static WvTime wvstime_cur = wvtime();
  66
  67
  68 const WvTime &wvstime()
  69 {
  70     return wvstime_cur;
  71 }
  72
  73
  74 static void do_wvstime_sync(bool forward_only)
  75 {
  76     if (!forward_only)
  77     {
  78         wvstime_cur = wvtime();
  79     }
  80     else
  81     {
  82         WvTime now = wvtime();
  83         if (wvstime_cur < now)
  84             wvstime_cur = now;
  85     }
  86 }
  87
  88
  89 void wvstime_sync()
  90 {
  91     do_wvstime_sync(false);
  92 }
  93
  94
  95 void wvstime_sync_forward()
  96 {
  97     do_wvstime_sync(true);
  98 }
  99
 100
 101 void wvstime_set(const WvTime &_new_time)
 102 {
 103     wvstime_cur = _new_time;
 104 }
 105