libstdc++-v3/src/c++11/cow-string-inst.cc

   1 // Reference-counted COW string instantiations -*- C++ -*-
   2
   3 // Copyright (C) 2014-2016 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