1 // Reference-counted COW string instantiations -*- C++ -*-
3 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
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)
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.
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.
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/>.
26 // ISO C++ 14882: 21 Strings library
29 #define _GLIBCXX_USE_CXX11_ABI 0
30 #include "string-inst.cc"
32 #if ! _GLIBCXX_USE_DUAL_ABI
33 # error This file should not be compiled for this configuration.
36 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
38 #if defined __i386__ || defined __x86_64__
43 namespace std
_GLIBCXX_VISIBILITY(default)
46 random_device::_M_init(const std::string
& token
)
48 const char *fname
= token
.c_str();
50 if (token
== "default")
52 #if (defined __i386__ || defined __x86_64__) && defined _GLIBCXX_X86_RDRAND
53 unsigned int eax
, ebx
, ecx
, edx
;
54 // Check availability of cpuid and, for now at least, also the
55 // CPU signature for Intel's
56 if (__get_cpuid_max(0, &ebx
) > 0 && ebx
== signature_INTEL_ebx
)
58 __cpuid(1, eax
, ebx
, ecx
, edx
);
67 fname
= "/dev/urandom";
69 else if (token
!= "/dev/urandom" && token
!= "/dev/random")
71 std::__throw_runtime_error(__N("random_device::"
72 "random_device(const std::string&)"));
74 _M_file
= static_cast<void*>(std::fopen(fname
, "rb"));
80 random_device::_M_init_pretr1(const std::string
& token
)
82 unsigned long __seed
= 5489UL;
83 if (token
!= "mt19937")
85 const char* __nptr
= token
.c_str();
87 __seed
= std::strtoul(__nptr
, &__endptr
, 0);
88 if (*__nptr
== '\0' || *__endptr
!= '\0')
89 std::__throw_runtime_error(__N("random_device::random_device"
90 "(const std::string&)"));