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  1. // Reference-counted COW string instantiations -*- C++ -*-
  2.  
  3. // Copyright (C) 2014-2015 Free Software Foundation, Inc.
  4. //
  5. // This file is part of the GNU ISO C++ Library.  This library is free
  6. // software; you can redistribute it and/or modify it under the
  7. // terms of the GNU General Public License as published by the
  8. // Free Software Foundation; either version 3, or (at your option)
  9. // any later version.
  10.  
  11. // This library is distributed in the hope that it will be useful,
  12. // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13. // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14. // GNU General Public License for more details.
  15.  
  16. // Under Section 7 of GPL version 3, you are granted additional
  17. // permissions described in the GCC Runtime Library Exception, version
  18. // 3.1, as published by the Free Software Foundation.
  19.  
  20. // You should have received a copy of the GNU General Public License and
  21. // a copy of the GCC Runtime Library Exception along with this program;
  22. // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23. // <http://www.gnu.org/licenses/>.
  24.  
  25. //
  26. // ISO C++ 14882: 21  Strings library
  27. //
  28.  
  29. #define _GLIBCXX_USE_CXX11_ABI 0
  30. #include "string-inst.cc"
  31.  
  32. #include <istream>
  33. #include <ostream>
  34.  
  35. #if ! _GLIBCXX_USE_DUAL_ABI
  36. # error This file should not be compiled for this configuration.
  37. #endif
  38.  
  39. namespace std _GLIBCXX_VISIBILITY(default)
  40. {
  41. _GLIBCXX_BEGIN_NAMESPACE_VERSION
  42.  
  43.   // These came from c++98/misc-inst.cc, repeat them for COW string
  44.   // string related to iostreams.
  45.   template
  46.     basic_istream<char>&
  47.     operator>>(basic_istream<char>&, string&);
  48.   template
  49.     basic_ostream<char>&
  50.     operator<<(basic_ostream<char>&, const string&);
  51.   template
  52.     basic_istream<char>&
  53.     getline(basic_istream<char>&, string&, char);
  54.   template
  55.     basic_istream<char>&
  56.     getline(basic_istream<char>&, string&);
  57.  
  58. _GLIBCXX_END_NAMESPACE_VERSION
  59. } // namespace
  60.  
  61. #ifdef  _GLIBCXX_USE_C99_STDINT_TR1
  62. #include <random>
  63. #if defined __i386__ || defined __x86_64__
  64. # include <cpuid.h>
  65. #endif
  66. #include <cstdio>
  67.  
  68. namespace std _GLIBCXX_VISIBILITY(default)
  69. {
  70.   void
  71.   random_device::_M_init(const std::string& token)
  72.   {
  73.     const char *fname = token.c_str();
  74.  
  75.     if (token == "default")
  76.       {
  77. #if (defined __i386__ || defined __x86_64__) && defined _GLIBCXX_X86_RDRAND
  78.         unsigned int eax, ebx, ecx, edx;
  79.         // Check availability of cpuid and, for now at least, also the
  80.         // CPU signature for Intel's
  81.         if (__get_cpuid_max(0, &ebx) > 0 && ebx == signature_INTEL_ebx)
  82.           {
  83.             __cpuid(1, eax, ebx, ecx, edx);
  84.             if (ecx & bit_RDRND)
  85.               {
  86.                 _M_file = nullptr;
  87.                 return;
  88.               }
  89.           }
  90. #endif
  91.  
  92.         fname = "/dev/urandom";
  93.       }
  94.     else if (token != "/dev/urandom" && token != "/dev/random")
  95.     fail:
  96.       std::__throw_runtime_error(__N("random_device::"
  97.                                      "random_device(const std::string&)"));
  98.  
  99.     _M_file = static_cast<void*>(std::fopen(fname, "rb"));
  100.     if (!_M_file)
  101.       goto fail;
  102.   }
  103.  
  104.   void
  105.   random_device::_M_init_pretr1(const std::string& token)
  106.   {
  107.     unsigned long __seed = 5489UL;
  108.     if (token != "mt19937")
  109.       {
  110.         const char* __nptr = token.c_str();
  111.         char* __endptr;
  112.         __seed = std::strtoul(__nptr, &__endptr, 0);
  113.         if (*__nptr == '\0' || *__endptr != '\0')
  114.           std::__throw_runtime_error(__N("random_device::random_device"
  115.                                          "(const std::string&)"));
  116.       }
  117.     _M_mt.seed(__seed);
  118.   }
  119. } // namespace
  120. #endif
  121.