Exemplos de INT_ADD_OVERFLOW em C++ (Cpp)

Exemplo n.º 1

Arquivo: timespec-add.c Projeto: 7696122/emacs

struct timespec
timespec_add (struct timespec a, struct timespec b)
{
  time_t rs = a.tv_sec;
  time_t bs = b.tv_sec;
  int ns = a.tv_nsec + b.tv_nsec;
  int nsd = ns - TIMESPEC_RESOLUTION;
  int rns = ns;
  time_t tmin = TYPE_MINIMUM (time_t);
  time_t tmax = TYPE_MAXIMUM (time_t);

  if (0 <= nsd)
    {
      rns = nsd;
      if (bs < tmax)
        bs++;
      else if (rs < 0)
        rs++;
      else
        goto high_overflow;
    }

  /* INT_ADD_WRAPV is not appropriate since time_t might be unsigned.
     In theory time_t might be narrower than int, so plain
     INT_ADD_OVERFLOW does not suffice.  */
  if (! INT_ADD_OVERFLOW (rs, bs) && tmin <= rs + bs && rs + bs <= tmax)
    rs += bs;
  else
    {
      if (rs < 0)
        {
          rs = tmin;
          rns = 0;
        }
      else
        {
        high_overflow:
          rs = tmax;
          rns = TIMESPEC_RESOLUTION - 1;
        }
    }

  return make_timespec (rs, rns);
}

Exemplo n.º 2

Arquivo: timespec-add.c Projeto: 0230/deepin-emacs

struct timespec
timespec_add (struct timespec a, struct timespec b)
{
    time_t rs = a.tv_sec;
    time_t bs = b.tv_sec;
    int ns = a.tv_nsec + b.tv_nsec;
    int nsd = ns - TIMESPEC_RESOLUTION;
    int rns = ns;

    if (0 <= nsd)
    {
        rns = nsd;
        if (rs == TYPE_MAXIMUM (time_t))
        {
            if (0 <= bs)
                goto high_overflow;
            bs++;
        }
        else
            rs++;
    }

    if (INT_ADD_OVERFLOW (rs, bs))
    {
        if (rs < 0)
        {
            rs = TYPE_MINIMUM (time_t);
            rns = 0;
        }
        else
        {
high_overflow:
            rs = TYPE_MAXIMUM (time_t);
            rns = TIMESPEC_RESOLUTION - 1;
        }
    }
    else
        rs += bs;

    return make_timespec (rs, rns);
}