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

   1 // Wrapper for underlying C-language localization -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2002, 2003 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 2, 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 //
  31 // ISO C++ 14882: 22.8  Standard locale categories.
  32 //
  33
  34 // Written by Benjamin Kosnik <bkoz@redhat.com>
  35
  36 #include <cerrno>  // For errno
  37 #include <cmath>  // For isinf, finite, finitef, fabs
  38 #include <cstdlib>  // For strof, strtold
  39 #include <locale>
  40
  41 #ifdef _GLIBCXX_HAVE_IEEEFP_H
  42 #include <ieeefp.h>
  43 #endif
  44
  45 namespace std
  46 {
  47   // Specializations for all types used in num_get.
  48   template<>
  49     void
  50     __convert_to_v(const char* __s, float& __v, ios_base::iostate& __err,
  51                    const __c_locale&)
  52     {
  53       if (!(__err & ios_base::failbit))
  54         {
  55           // Assumes __s formatted for "C" locale.
  56           char* __old = strdup(setlocale(LC_ALL, NULL));
  57           setlocale(LC_ALL, "C");
  58           char* __sanity;
  59           errno = 0;
  60 #if defined(_GLIBCXX_HAVE_STRTOF)
  61           float __f = strtof(__s, &__sanity);
  62 #else
  63           double __d = strtod(__s, &__sanity);
  64           float __f = static_cast<float>(__d);
  65 #ifdef _GLIBCXX_HAVE_FINITEF
  66           if (!finitef (__f))
  67             errno = ERANGE;
  68 #elif defined (_GLIBCXX_HAVE_FINITE)
  69           if (!finite (static_cast<double> (__f)))
  70             errno = ERANGE;
  71 #elif defined (_GLIBCXX_HAVE_ISINF)
  72           if (isinf (static_cast<double> (__f)))
  73             errno = ERANGE;
  74 #else
  75           if (fabs(__d) > numeric_limits<float>::max())
  76             errno = ERANGE;
  77 #endif
  78 #endif
  79           if (__sanity != __s && errno != ERANGE)
  80             __v = __f;
  81           else
  82             __err |= ios_base::failbit;
  83           setlocale(LC_ALL, __old);
  84           free(__old);
  85         }
  86     }
  87
  88   template<>
  89     void
  90     __convert_to_v(const char* __s, double& __v, ios_base::iostate& __err,
  91                    const __c_locale&)
  92     {
  93       if (!(__err & ios_base::failbit))
  94         {
  95           // Assumes __s formatted for "C" locale.
  96           char* __old = strdup(setlocale(LC_ALL, NULL));
  97           setlocale(LC_ALL, "C");
  98           char* __sanity;
  99           errno = 0;
 100           double __d = strtod(__s, &__sanity);
 101           if (__sanity != __s && errno != ERANGE)
 102             __v = __d;
 103           else
 104             __err |= ios_base::failbit;
 105           setlocale(LC_ALL, __old);
 106           free(__old);
 107         }
 108     }
 109
 110   template<>
 111     void
 112     __convert_to_v(const char* __s, long double& __v,
 113                    ios_base::iostate& __err, const __c_locale&)
 114     {
 115       if (!(__err & ios_base::failbit))
 116         {
 117           // Assumes __s formatted for "C" locale.
 118           char* __old = strdup(setlocale(LC_ALL, NULL));
 119           setlocale(LC_ALL, "C");
 120 #if defined(_GLIBCXX_HAVE_STRTOLD)
 121           char* __sanity;
 122           errno = 0;
 123           long double __ld = strtold(__s, &__sanity);
 124           if (__sanity != __s && errno != ERANGE)
 125             __v = __ld;
 126 #else
 127           typedef char_traits<char>::int_type int_type;
 128           long double __ld;
 129           errno = 0;
 130           int __p = sscanf(__s, "%Lf", &__ld);
 131           if (__p && static_cast<int_type>(__p) != char_traits<char>::eof()
 132               && errno != ERANGE)
 133             __v = __ld;
 134 #endif
 135           else
 136             __err |= ios_base::failbit;
 137           setlocale(LC_ALL, __old);
 138           free(__old);
 139         }
 140     }
 141
 142   void
 143   locale::facet::_S_create_c_locale(__c_locale& __cloc, const char* __s,
 144                                     __c_locale)
 145   {
 146     // Currently, the generic model only supports the "C" locale.
 147     // See http://gcc.gnu.org/ml/libstdc++/2003-02/msg00345.html
 148     __cloc = NULL;
 149     if (strcmp(__s, "C"))
 150       __throw_runtime_error(__N("locale::facet::_S_create_c_locale "
 151                             "name not valid"));
 152   }
 153
 154   void
 155   locale::facet::_S_destroy_c_locale(__c_locale& __cloc)
 156   { __cloc = NULL; }
 157
 158   __c_locale
 159   locale::facet::_S_clone_c_locale(__c_locale&)
 160   { return __c_locale(); }
 161 } // namespace std
 162
 163 namespace __gnu_cxx
 164 {
 165   const char* const category_names[6 + _GLIBCXX_NUM_CATEGORIES] =
 166     {
 167       "LC_CTYPE",
 168       "LC_NUMERIC",
 169       "LC_TIME",
 170       "LC_COLLATE",
 171       "LC_MONETARY",
 172       "LC_MESSAGES"
 173     };
 174 }
 175
 176 namespace std
 177 {
 178   const char* const* const locale::_S_categories = __gnu_cxx::category_names;
 179 }  // namespace std