ceph/src/common/bit_str.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2016 SUSE LINUX GmbH
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14 #include "common/bit_str.h"
  15 #include "common/Formatter.h"
  16 #include "include/ceph_assert.h"
  17
  18 static void _dump_bit_str(
  19     uint64_t bits,
  20     std::ostream *out,
  21     ceph::Formatter *f,
  22     std::function<const char*(uint64_t)> func,
  23     bool dump_bit_val)
  24 {
  25   uint64_t b = bits;
  26   int cnt = 0;
  27   bool outted = false;
  28
  29   while (b && cnt < 64) {
  30     uint64_t r = bits & (1ULL << cnt++);
  31     if (r) {
  32       if (out) {
  33         if (outted)
  34           *out << ",";
  35         *out << func(r);
  36         if (dump_bit_val) {
  37           *out << "(" << r << ")";
  38         }
  39       } else {
  40         ceph_assert(f != NULL);
  41         if (dump_bit_val) {
  42           f->dump_stream("bit_flag") << func(r)
  43                                      << "(" << r << ")";
  44         } else {
  45           f->dump_stream("bit_flag") << func(r);
  46         }
  47       }
  48       outted = true;
  49     }
  50     b >>= 1;
  51   }
  52   if (!outted && out)
  53       *out << "none";
  54 }
  55
  56 void print_bit_str(
  57     uint64_t bits,
  58     std::ostream &out,
  59     const std::function<const char*(uint64_t)> &func,
  60     bool dump_bit_val)
  61 {
  62   _dump_bit_str(bits, &out, NULL, func, dump_bit_val);
  63 }
  64
  65 void dump_bit_str(
  66     uint64_t bits,
  67     ceph::Formatter *f,
  68     const std::function<const char*(uint64_t)> &func,
  69     bool dump_bit_val)
  70 {
  71   _dump_bit_str(bits, NULL, f, func, dump_bit_val);
  72 }