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