src/compat/glibcxx_sanity.cpp

   1 // Copyright (c) 2009-2017 The Bitcoin Core developers
   2 // Distributed under the MIT software license, see the accompanying
   3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   4
   5 #include <list>
   6 #include <locale>
   7 #include <stdexcept>
   8
   9 namespace
  10 {
  11 // trigger: use ctype<char>::widen to trigger ctype<char>::_M_widen_init().
  12 // test: convert a char from narrow to wide and back. Verify that the result
  13 //   matches the original.
  14 bool sanity_test_widen(char testchar)
  15 {
  16     const std::ctype<char>& test(std::use_facet<std::ctype<char> >(std::locale()));
  17     return test.narrow(test.widen(testchar), 'b') == testchar;
  18 }
  19
  20 // trigger: use list::push_back and list::pop_back to trigger _M_hook and
  21 //   _M_unhook.
  22 // test: Push a sequence of integers into a list. Pop them off and verify that
  23 //   they match the original sequence.
  24 bool sanity_test_list(unsigned int size)
  25 {
  26     std::list<unsigned int> test;
  27     for (unsigned int i = 0; i != size; ++i)
  28         test.push_back(i + 1);
  29
  30     if (test.size() != size)
  31         return false;
  32
  33     while (!test.empty()) {
  34         if (test.back() != test.size())
  35             return false;
  36         test.pop_back();
  37     }
  38     return true;
  39 }
  40
  41 } // namespace
  42
  43 // trigger: string::at(x) on an empty string to trigger __throw_out_of_range_fmt.
  44 // test: force std::string to throw an out_of_range exception. Verify that
  45 //   it's caught correctly.
  46 bool sanity_test_range_fmt()
  47 {
  48     std::string test;
  49     try {
  50         test.at(1);
  51     } catch (const std::out_of_range&) {
  52         return true;
  53     } catch (...) {
  54     }
  55     return false;
  56 }
  57
  58 bool glibcxx_sanity_test()
  59 {
  60     return sanity_test_widen('a') && sanity_test_list(100) && sanity_test_range_fmt();
  61 }