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
   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 2, 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 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20 // USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 //
  32 // ISO C++ 14882: 22.8  Standard locale categories.
  33 //
  34
  35 // Written by Benjamin Kosnik <bkoz@redhat.com>
  36
  37 #include <cerrno>  // For errno
  38 #include <cmath>  // For isinf, finite, finitef, fabs
  39 #include <cstdlib>  // For strof, strtold
  40 #include <locale>
  41
  42 #ifdef _GLIBCXX_HAVE_IEEEFP_H
  43 #include <ieeefp.h>
  44 #endif
  45
  46 _GLIBCXX_BEGIN_NAMESPACE(std)
  47
  48   // Specializations for all types used in num_get.
  49   template<>
  50     void
  51     __convert_to_v(const char* __s, float& __v, ios_base::iostate& __err,
  52                    const __c_locale&)
  53     {
  54       // Assumes __s formatted for "C" locale.
  55       errno = 0;
  56       char* __old = strdup(setlocale(LC_ALL, NULL));
  57       setlocale(LC_ALL, "C");
  58       char* __sanity;
  59 #if defined(_GLIBCXX_HAVE_STRTOF)
  60       float __f = strtof(__s, &__sanity);
  61 #else
  62       double __d = strtod(__s, &__sanity);
  63       float __f = static_cast<float>(__d);
  64 #ifdef _GLIBCXX_HAVE_FINITEF
  65       if (!finitef (__f))
  66         errno = ERANGE;
  67 #elif defined (_GLIBCXX_HAVE_FINITE)
  68       if (!finite (static_cast<double> (__f)))
  69         errno = ERANGE;
  70 #elif defined (_GLIBCXX_HAVE_ISINF)
  71       if (isinf (static_cast<double> (__f)))
  72         errno = ERANGE;
  73 #else
  74       if (fabs(__d) > numeric_limits<float>::max())
  75         errno = ERANGE;
  76 #endif
  77 #endif
  78       if (__sanity != __s && errno != ERANGE)
  79         __v = __f;
  80       else
  81         __err |= ios_base::failbit;
  82       setlocale(LC_ALL, __old);
  83       free(__old);
  84     }
  85
  86   template<>
  87     void
  88     __convert_to_v(const char* __s, double& __v, ios_base::iostate& __err,
  89                    const __c_locale&)
  90     {
  91       // Assumes __s formatted for "C" locale.
  92       errno = 0;
  93       char* __old = strdup(setlocale(LC_ALL, NULL));
  94       setlocale(LC_ALL, "C");
  95       char* __sanity;
  96       double __d = strtod(__s, &__sanity);
  97       if (__sanity != __s && errno != ERANGE)
  98         __v = __d;
  99       else
 100         __err |= ios_base::failbit;
 101       setlocale(LC_ALL, __old);
 102       free(__old);
 103     }
 104
 105   template<>
 106     void
 107     __convert_to_v(const char* __s, long double& __v,
 108                    ios_base::iostate& __err, const __c_locale&)
 109     {
 110       // Assumes __s formatted for "C" locale.
 111       errno = 0;
 112       char* __old = strdup(setlocale(LC_ALL, NULL));
 113       setlocale(LC_ALL, "C");
 114 #if defined(_GLIBCXX_HAVE_STRTOLD)
 115       char* __sanity;
 116       long double __ld = strtold(__s, &__sanity);
 117       if (__sanity != __s && errno != ERANGE)
 118         __v = __ld;
 119 #else
 120       typedef char_traits<char>::int_type int_type;
 121       long double __ld;
 122       int __p = sscanf(__s, "%Lf", &__ld);
 123       if (__p && static_cast<int_type>(__p) != char_traits<char>::eof()
 124           && errno != ERANGE)
 125         __v = __ld;
 126 #endif
 127       else
 128         __err |= ios_base::failbit;
 129       setlocale(LC_ALL, __old);
 130       free(__old);
 131     }
 132
 133   void
 134   locale::facet::_S_create_c_locale(__c_locale& __cloc, const char* __s,
 135                                     __c_locale)
 136   {
 137     // Currently, the generic model only supports the "C" locale.
 138     // See http://gcc.gnu.org/ml/libstdc++/2003-02/msg00345.html
 139     __cloc = NULL;
 140     if (strcmp(__s, "C"))
 141       __throw_runtime_error(__N("locale::facet::_S_create_c_locale "
 142                             "name not valid"));
 143   }
 144
 145   void
 146   locale::facet::_S_destroy_c_locale(__c_locale& __cloc)
 147   { __cloc = NULL; }
 148
 149   __c_locale
 150   locale::facet::_S_clone_c_locale(__c_locale&)
 151   { return __c_locale(); }
 152
 153 _GLIBCXX_END_NAMESPACE
 154
 155 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
 156
 157   const char* const category_names[6 + _GLIBCXX_NUM_CATEGORIES] =
 158     {
 159       "LC_CTYPE",
 160       "LC_NUMERIC",
 161       "LC_TIME",
 162       "LC_COLLATE",
 163       "LC_MONETARY",
 164       "LC_MESSAGES"
 165     };
 166
 167 _GLIBCXX_END_NAMESPACE
 168
 169 _GLIBCXX_BEGIN_NAMESPACE(std)
 170
 171   const char* const* const locale::_S_categories = __gnu_cxx::category_names;
 172
 173 _GLIBCXX_END_NAMESPACE
 174
 175 // XXX GLIBCXX_ABI Deprecated
 176 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
 177 #define _GLIBCXX_LDBL_COMPAT(dbl, ldbl) \
 178   extern "C" void ldbl (void) __attribute__ ((alias (#dbl)))
 179 _GLIBCXX_LDBL_COMPAT(_ZSt14__convert_to_vIdEvPKcRT_RSt12_Ios_IostateRKPi, _ZSt14__convert_to_vIeEvPKcRT_RSt12_Ios_IostateRKPi);
 180 #endif // _GLIBCXX_LONG_DOUBLE_COMPAT