1*38fd1498Szrj // Reference-counted COW string instantiations -*- C++ -*- 2*38fd1498Szrj 3*38fd1498Szrj // Copyright (C) 2014-2018 Free Software Foundation, Inc. 4*38fd1498Szrj // 5*38fd1498Szrj // This file is part of the GNU ISO C++ Library. This library is free 6*38fd1498Szrj // software; you can redistribute it and/or modify it under the 7*38fd1498Szrj // terms of the GNU General Public License as published by the 8*38fd1498Szrj // Free Software Foundation; either version 3, or (at your option) 9*38fd1498Szrj // any later version. 10*38fd1498Szrj 11*38fd1498Szrj // This library is distributed in the hope that it will be useful, 12*38fd1498Szrj // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*38fd1498Szrj // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*38fd1498Szrj // GNU General Public License for more details. 15*38fd1498Szrj 16*38fd1498Szrj // Under Section 7 of GPL version 3, you are granted additional 17*38fd1498Szrj // permissions described in the GCC Runtime Library Exception, version 18*38fd1498Szrj // 3.1, as published by the Free Software Foundation. 19*38fd1498Szrj 20*38fd1498Szrj // You should have received a copy of the GNU General Public License and 21*38fd1498Szrj // a copy of the GCC Runtime Library Exception along with this program; 22*38fd1498Szrj // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23*38fd1498Szrj // <http://www.gnu.org/licenses/>. 24*38fd1498Szrj 25*38fd1498Szrj // 26*38fd1498Szrj // ISO C++ 14882: 21 Strings library 27*38fd1498Szrj // 28*38fd1498Szrj 29*38fd1498Szrj #define _GLIBCXX_USE_CXX11_ABI 0 30*38fd1498Szrj #include "string-inst.cc" 31*38fd1498Szrj 32*38fd1498Szrj #if ! _GLIBCXX_USE_DUAL_ABI 33*38fd1498Szrj # error This file should not be compiled for this configuration. 34*38fd1498Szrj #endif 35*38fd1498Szrj 36*38fd1498Szrj #ifdef _GLIBCXX_USE_C99_STDINT_TR1 37*38fd1498Szrj #include <random> 38*38fd1498Szrj #if defined __i386__ || defined __x86_64__ 39*38fd1498Szrj # include <cpuid.h> 40*38fd1498Szrj #endif 41*38fd1498Szrj #include <cstdio> 42*38fd1498Szrj 43*38fd1498Szrj namespace std _GLIBCXX_VISIBILITY(default) 44*38fd1498Szrj { 45*38fd1498Szrj void _M_init(const std::string & token)46*38fd1498Szrj random_device::_M_init(const std::string& token) 47*38fd1498Szrj { 48*38fd1498Szrj const char *fname = token.c_str(); 49*38fd1498Szrj 50*38fd1498Szrj if (token == "default") 51*38fd1498Szrj { 52*38fd1498Szrj #if (defined __i386__ || defined __x86_64__) && defined _GLIBCXX_X86_RDRAND 53*38fd1498Szrj unsigned int eax, ebx, ecx, edx; 54*38fd1498Szrj // Check availability of cpuid and, for now at least, also the 55*38fd1498Szrj // CPU signature for Intel's 56*38fd1498Szrj if (__get_cpuid_max(0, &ebx) > 0 && ebx == signature_INTEL_ebx) 57*38fd1498Szrj { 58*38fd1498Szrj __cpuid(1, eax, ebx, ecx, edx); 59*38fd1498Szrj if (ecx & bit_RDRND) 60*38fd1498Szrj { 61*38fd1498Szrj _M_file = nullptr; 62*38fd1498Szrj return; 63*38fd1498Szrj } 64*38fd1498Szrj } 65*38fd1498Szrj #endif 66*38fd1498Szrj 67*38fd1498Szrj fname = "/dev/urandom"; 68*38fd1498Szrj } 69*38fd1498Szrj else if (token != "/dev/urandom" && token != "/dev/random") 70*38fd1498Szrj fail: 71*38fd1498Szrj std::__throw_runtime_error(__N("random_device::" 72*38fd1498Szrj "random_device(const std::string&)")); 73*38fd1498Szrj 74*38fd1498Szrj _M_file = static_cast<void*>(std::fopen(fname, "rb")); 75*38fd1498Szrj if (!_M_file) 76*38fd1498Szrj goto fail; 77*38fd1498Szrj } 78*38fd1498Szrj 79*38fd1498Szrj void _M_init_pretr1(const std::string & token)80*38fd1498Szrj random_device::_M_init_pretr1(const std::string& token) 81*38fd1498Szrj { 82*38fd1498Szrj unsigned long __seed = 5489UL; 83*38fd1498Szrj if (token != "mt19937") 84*38fd1498Szrj { 85*38fd1498Szrj const char* __nptr = token.c_str(); 86*38fd1498Szrj char* __endptr; 87*38fd1498Szrj __seed = std::strtoul(__nptr, &__endptr, 0); 88*38fd1498Szrj if (*__nptr == '\0' || *__endptr != '\0') 89*38fd1498Szrj std::__throw_runtime_error(__N("random_device::random_device" 90*38fd1498Szrj "(const std::string&)")); 91*38fd1498Szrj } 92*38fd1498Szrj _M_mt.seed(__seed); 93*38fd1498Szrj } 94*38fd1498Szrj } // namespace 95*38fd1498Szrj #endif 96