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/assert.h"
  17 #include "common/debug.h"
  18
  19 static void _dump_bit_str(
  20     uint64_t bits,
  21     std::ostream *out,
  22     ceph::Formatter *f,
  23     std::function<const char*(uint64_t)> func,
  24     bool dump_bit_val)
  25 {
  26   uint64_t b = bits;
  27   int cnt = 0;
  28   bool outted = false;
  29
  30   while (b && cnt < 64) {
  31     uint64_t r = bits & (1ULL << cnt++);
  32     if (r) {
  33       if (out) {
  34         if (outted)
  35           *out << ",";
  36         *out << func(r);
  37         if (dump_bit_val) {
  38           *out << "(" << r << ")";
  39         }
  40       } else {
  41         assert(f != NULL);
  42         if (dump_bit_val) {
  43           f->dump_stream("bit_flag") << func(r)
  44                                      << "(" << r << ")";
  45         } else {
  46           f->dump_stream("bit_flag") << func(r);
  47         }
  48       }
  49       outted = true;
  50     }
  51     b >>= 1;
  52   }
  53   if (!outted && out)
  54       *out << "none";
  55 }
  56
  57 void print_bit_str(
  58     uint64_t bits,
  59     std::ostream &out,
  60     std::function<const char*(uint64_t)> func,
  61     bool dump_bit_val)
  62 {
  63   _dump_bit_str(bits, &out, NULL, func, dump_bit_val);
  64 }
  65
  66 void dump_bit_str(
  67     uint64_t bits,
  68     ceph::Formatter *f,
  69     std::function<const char*(uint64_t)> func,
  70     bool dump_bit_val)
  71 {
  72   _dump_bit_str(bits, NULL, f, func, dump_bit_val);
  73 }