libstdc++-v3/config/locale/generic/c_locale.cc

   1 // Wrapper for underlying C-language localization -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 //
  27 // ISO C++ 14882: 22.8  Standard locale categories.
  28 //
  29
  30 // Written by Benjamin Kosnik <bkoz@redhat.com>
  31
  32 #include <cerrno>  // For errno
  33 #include <cmath>  // For isinf, finite, finitef, fabs
  34 #include <cstdlib>  // For strof, strtold
  35 #include <cstring>
  36 #include <cstdio>
  37 #include <locale>
  38 #include <limits>
  39 #include <cstddef>
  40
  41 #ifdef _GLIBCXX_HAVE_IEEEFP_H
  42 #include <ieeefp.h>
  43 #endif
  44
  45 _GLIBCXX_BEGIN_NAMESPACE(std)
  46
  47   template<>
  48     void
  49     __convert_to_v(const char* __s, float& __v, ios_base::iostate& __err,
  50                    const __c_locale&) throw()
  51     {
  52       // Assumes __s formatted for "C" locale.
  53       char* __old = setlocale(LC_ALL, NULL);
  54       const size_t __len = strlen(__old) + 1;
  55       char* __sav = new char[__len];
  56       memcpy(__sav, __old, __len);
  57       setlocale(LC_ALL, "C");
  58       char* __sanity;
  59       bool __overflow = false;
  60
  61 #if !__FLT_HAS_INFINITY__
  62       errno = 0;
  63 #endif
  64
  65 #ifdef _GLIBCXX_HAVE_STRTOF
  66       __v = strtof(__s, &__sanity);
  67 #else
  68       double __d = strtod(__s, &__sanity);
  69       __v = static_cast<float>(__d);
  70 #ifdef _GLIBCXX_HAVE_FINITEF
  71       if (!finitef (__v))
  72         __overflow = true;
  73 #elif defined (_GLIBCXX_HAVE_FINITE)
  74       if (!finite (static_cast<double> (__v)))
  75         __overflow = true;
  76 #elif defined (_GLIBCXX_HAVE_ISINF)
  77       if (isinf (static_cast<double> (__v)))
  78         __overflow = true;
  79 #else
  80       if (fabs(__d) > numeric_limits<float>::max())
  81         __overflow = true;
  82 #endif
  83 #endif // _GLIBCXX_HAVE_STRTOF
  84
  85       // _GLIBCXX_RESOLVE_LIB_DEFECTS
  86       // 23. Num_get overflow result.
  87       if (__sanity == __s || *__sanity != '\0')
  88         {
  89           __v = 0.0f;
  90           __err = ios_base::failbit;
  91         }
  92       else if (__overflow
  93 #if __FLT_HAS_INFINITY__
  94                || __v == numeric_limits<float>::infinity()
  95                || __v == -numeric_limits<float>::infinity()
  96 #else
  97                || ((__v > 1.0f || __v < -1.0f) && errno == ERANGE)
  98 #endif
  99               )
 100         {
 101           if (__v > 0.0f)
 102             __v = numeric_limits<float>::max();
 103           else
 104             __v = -numeric_limits<float>::max();
 105           __err = ios_base::failbit;
 106         }
 107
 108       setlocale(LC_ALL, __sav);
 109       delete [] __sav;
 110     }
 111
 112   template<>
 113     void
 114     __convert_to_v(const char* __s, double& __v, ios_base::iostate& __err,
 115                    const __c_locale&) throw()
 116     {
 117       // Assumes __s formatted for "C" locale.
 118       char* __old = setlocale(LC_ALL, NULL);
 119       const size_t __len = strlen(__old) + 1;
 120       char* __sav = new char[__len];
 121       memcpy(__sav, __old, __len);
 122       setlocale(LC_ALL, "C");
 123       char* __sanity;
 124
 125 #if !__DBL_HAS_INFINITY__
 126       errno = 0;
 127 #endif
 128
 129       __v = strtod(__s, &__sanity);
 130
 131       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 132       // 23. Num_get overflow result.
 133       if (__sanity == __s || *__sanity != '\0')
 134         {
 135           __v = 0.0;
 136           __err = ios_base::failbit;
 137         }
 138       else if (
 139 #if __DBL_HAS_INFINITY__
 140                __v == numeric_limits<double>::infinity()
 141                || __v == -numeric_limits<double>::infinity())
 142 #else
 143                (__v > 1.0 || __v < -1.0) && errno == ERANGE)
 144 #endif
 145         {
 146           if (__v > 0.0)
 147             __v = numeric_limits<double>::max();
 148           else
 149             __v = -numeric_limits<double>::max();
 150           __err = ios_base::failbit;
 151         }
 152
 153       setlocale(LC_ALL, __sav);
 154       delete [] __sav;
 155     }
 156
 157   template<>
 158     void
 159     __convert_to_v(const char* __s, long double& __v,
 160                    ios_base::iostate& __err, const __c_locale&) throw()
 161     {
 162       // Assumes __s formatted for "C" locale.
 163       char* __old = setlocale(LC_ALL, NULL);
 164       const size_t __len = strlen(__old) + 1;
 165       char* __sav = new char[__len];
 166       memcpy(__sav, __old, __len);
 167       setlocale(LC_ALL, "C");
 168
 169 #if !__LDBL_HAS_INFINITY__
 170       errno = 0;
 171 #endif
 172
 173 #if defined(_GLIBCXX_HAVE_STRTOLD) && !defined(_GLIBCXX_HAVE_BROKEN_STRTOLD)
 174       char* __sanity;
 175       __v = strtold(__s, &__sanity);
 176
 177       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 178       // 23. Num_get overflow result.
 179       if (__sanity == __s || *__sanity != '\0')
 180 #else
 181       typedef char_traits<char>::int_type int_type;
 182       int __p = sscanf(__s, "%Lf", &__v);
 183
 184       if (!__p || static_cast<int_type>(__p) == char_traits<char>::eof())
 185 #endif
 186         {
 187           __v = 0.0l;
 188           __err = ios_base::failbit;
 189         }
 190        else if (
 191 #if __LDBL_HAS_INFINITY__
 192                 __v == numeric_limits<long double>::infinity()
 193                 || __v == -numeric_limits<long double>::infinity())
 194 #else
 195                 (__v > 1.0l || __v < -1.0l) && errno == ERANGE)
 196 #endif
 197         {
 198           if (__v > 0.0l)
 199             __v = numeric_limits<long double>::max();
 200           else
 201             __v = -numeric_limits<long double>::max();
 202           __err = ios_base::failbit;
 203         }
 204
 205       setlocale(LC_ALL, __sav);
 206       delete [] __sav;
 207     }
 208
 209   void
 210   locale::facet::_S_create_c_locale(__c_locale& __cloc, const char* __s,
 211                                     __c_locale)
 212   {
 213     // Currently, the generic model only supports the "C" locale.
 214     // See http://gcc.gnu.org/ml/libstdc++/2003-02/msg00345.html
 215     __cloc = NULL;
 216     if (strcmp(__s, "C"))
 217       __throw_runtime_error(__N("locale::facet::_S_create_c_locale "
 218                             "name not valid"));
 219   }
 220
 221   void
 222   locale::facet::_S_destroy_c_locale(__c_locale& __cloc)
 223   { __cloc = NULL; }
 224
 225   __c_locale
 226   locale::facet::_S_clone_c_locale(__c_locale&) throw()
 227   { return __c_locale(); }
 228
 229   __c_locale
 230   locale::facet::_S_lc_ctype_c_locale(__c_locale, const char*)
 231   { return __c_locale(); }
 232
 233 _GLIBCXX_END_NAMESPACE
 234
 235 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
 236
 237   const char* const category_names[6 + _GLIBCXX_NUM_CATEGORIES] =
 238     {
 239       "LC_CTYPE",
 240       "LC_NUMERIC",
 241       "LC_TIME",
 242       "LC_COLLATE",
 243       "LC_MONETARY",
 244       "LC_MESSAGES"
 245     };
 246
 247 _GLIBCXX_END_NAMESPACE
 248
 249 _GLIBCXX_BEGIN_NAMESPACE(std)
 250
 251   const char* const* const locale::_S_categories = __gnu_cxx::category_names;
 252
 253 _GLIBCXX_END_NAMESPACE
 254
 255 // XXX GLIBCXX_ABI Deprecated
 256 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
 257 #define _GLIBCXX_LDBL_COMPAT(dbl, ldbl) \
 258   extern "C" void ldbl (void) __attribute__ ((alias (#dbl)))
 259 _GLIBCXX_LDBL_COMPAT(_ZSt14__convert_to_vIdEvPKcRT_RSt12_Ios_IostateRKPi, _ZSt14__convert_to_vIeEvPKcRT_RSt12_Ios_IostateRKPi);
 260 #endif // _GLIBCXX_LONG_DOUBLE_COMPAT