kc3-lang/gnulib/lib/dtotimespec.c

• Show log

  Commit

• Hash : b021c53f
  Author :
  Date : 2018-09-10T18:42:25
  

  timespec: fix resolution confusion
  
  In normal usage, clock resolution is given in seconds, but the
  code was mistakenly using inverse seconds and calling it
  “resolution”.  Fix this, partly by renaming two identifiers.
  The old names will be kept for a bit, to ease transition.
  * lib/timespec.h (TIMESPEC_HZ, LOG10_TIMESPEC_HZ):
  New constants, replacing TIMESPEC_RESOLUTION and
  LOG10_TIMESPEC_RESOLUTION, which are now obsolescent.
  All uses changed.
  

Download

• lib/dtotimespec.c

• /* Convert double to timespec.
  
     Copyright (C) 2011-2018 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* written by Paul Eggert */
  
  /* Convert the double value SEC to a struct timespec.  Round toward
     positive infinity.  On overflow, return an extremal value.  */
  
  #include <config.h>
  
  #include "timespec.h"
  
  #include "intprops.h"
  
  struct timespec
  dtotimespec (double sec)
  {
    if (! (TYPE_MINIMUM (time_t) < sec))
      return make_timespec (TYPE_MINIMUM (time_t), 0);
    else if (! (sec < 1.0 + TYPE_MAXIMUM (time_t)))
      return make_timespec (TYPE_MAXIMUM (time_t), TIMESPEC_HZ - 1);
    else
      {
        time_t s = sec;
        double frac = TIMESPEC_HZ * (sec - s);
        long ns = frac;
        ns += ns < frac;
        s += ns / TIMESPEC_HZ;
        ns %= TIMESPEC_HZ;
  
        if (ns < 0)
          {
            s--;
            ns += TIMESPEC_HZ;
          }
  
        return make_timespec (s, ns);
      }
  }
  

Download