xref: /netbsd-src/external/gpl3/gcc.old/dist/libstdc++-v3/src/c++11/cow-string-inst.cc (revision bdc22b2e01993381dcefeff2bc9b56ca75a4235c)
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