278 lines
7.3 KiB
C++
278 lines
7.3 KiB
C++
// Wrapper for underlying C-language localization -*- C++ -*-
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// Copyright (C) 2001-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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//
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// ISO C++ 14882: 22.8 Standard locale categories.
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//
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// Written by Benjamin Kosnik <bkoz@redhat.com>
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#include <cerrno> // For errno
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#include <cmath> // For isinf, finite, finitef, fabs
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#include <cstdlib> // For strof, strtold
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#include <cstring>
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#include <cstdio>
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#include <locale>
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#include <limits>
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#ifdef _GLIBCXX_HAVE_IEEEFP_H
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#include <ieeefp.h>
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#endif
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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namespace
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{
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struct _Save_errno
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{
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_Save_errno() : _M_errno(errno) { errno = 0; }
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~_Save_errno() { if (errno == 0) errno = _M_errno; }
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int _M_errno;
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};
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}
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template<>
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void
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__convert_to_v(const char* __s, float& __v, ios_base::iostate& __err,
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const __c_locale&) throw()
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{
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// Assumes __s formatted for "C" locale.
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char* __old = setlocale(LC_ALL, 0);
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const size_t __len = strlen(__old) + 1;
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char* __sav = new char[__len];
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memcpy(__sav, __old, __len);
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setlocale(LC_ALL, "C");
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char* __sanity;
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bool __overflow = false;
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#if !__FLT_HAS_INFINITY__
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const _Save_errno __save_errno;
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#endif
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#ifdef _GLIBCXX_HAVE_STRTOF
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__v = strtof(__s, &__sanity);
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#else
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double __d = strtod(__s, &__sanity);
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__v = static_cast<float>(__d);
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#ifdef _GLIBCXX_HAVE_FINITEF
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if (!finitef (__v))
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__overflow = true;
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#elif defined (_GLIBCXX_HAVE_FINITE)
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if (!finite (static_cast<double> (__v)))
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__overflow = true;
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#elif defined (_GLIBCXX_HAVE_ISINF)
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if (isinf (static_cast<double> (__v)))
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__overflow = true;
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#else
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if (fabs(__d) > numeric_limits<float>::max())
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__overflow = true;
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#endif
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#endif // _GLIBCXX_HAVE_STRTOF
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 23. Num_get overflow result.
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if (__sanity == __s || *__sanity != '\0')
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{
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__v = 0.0f;
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__err = ios_base::failbit;
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}
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else if (__overflow
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#if __FLT_HAS_INFINITY__
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|| __v == numeric_limits<float>::infinity()
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|| __v == -numeric_limits<float>::infinity()
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#else
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|| ((__v > 1.0f || __v < -1.0f) && errno == ERANGE)
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#endif
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)
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{
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if (__v > 0.0f)
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__v = numeric_limits<float>::max();
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else
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__v = -numeric_limits<float>::max();
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__err = ios_base::failbit;
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}
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setlocale(LC_ALL, __sav);
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delete [] __sav;
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}
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template<>
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void
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__convert_to_v(const char* __s, double& __v, ios_base::iostate& __err,
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const __c_locale&) throw()
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{
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// Assumes __s formatted for "C" locale.
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char* __old = setlocale(LC_ALL, 0);
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const size_t __len = strlen(__old) + 1;
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char* __sav = new char[__len];
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memcpy(__sav, __old, __len);
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setlocale(LC_ALL, "C");
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char* __sanity;
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#if !__DBL_HAS_INFINITY__
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const _Save_errno __save_errno;
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#endif
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__v = strtod(__s, &__sanity);
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 23. Num_get overflow result.
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if (__sanity == __s || *__sanity != '\0')
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{
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__v = 0.0;
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__err = ios_base::failbit;
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}
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else if (
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#if __DBL_HAS_INFINITY__
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__v == numeric_limits<double>::infinity()
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|| __v == -numeric_limits<double>::infinity())
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#else
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(__v > 1.0 || __v < -1.0) && errno == ERANGE)
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#endif
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{
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if (__v > 0.0)
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__v = numeric_limits<double>::max();
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else
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__v = -numeric_limits<double>::max();
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__err = ios_base::failbit;
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}
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setlocale(LC_ALL, __sav);
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delete [] __sav;
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}
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template<>
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void
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__convert_to_v(const char* __s, long double& __v,
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ios_base::iostate& __err, const __c_locale&) throw()
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{
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// Assumes __s formatted for "C" locale.
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char* __old = setlocale(LC_ALL, 0);
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const size_t __len = strlen(__old) + 1;
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char* __sav = new char[__len];
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memcpy(__sav, __old, __len);
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setlocale(LC_ALL, "C");
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#if !__LDBL_HAS_INFINITY__
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const _Save_errno __save_errno;
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#endif
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#if defined(_GLIBCXX_HAVE_STRTOLD) && !defined(_GLIBCXX_HAVE_BROKEN_STRTOLD)
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char* __sanity;
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__v = strtold(__s, &__sanity);
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 23. Num_get overflow result.
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if (__sanity == __s || *__sanity != '\0')
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#else
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typedef char_traits<char>::int_type int_type;
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int __p = sscanf(__s, "%Lf", &__v);
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if (!__p || static_cast<int_type>(__p) == char_traits<char>::eof())
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#endif
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{
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__v = 0.0l;
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__err = ios_base::failbit;
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}
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else if (
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#if __LDBL_HAS_INFINITY__
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__v == numeric_limits<long double>::infinity()
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|| __v == -numeric_limits<long double>::infinity())
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#else
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(__v > 1.0l || __v < -1.0l) && errno == ERANGE)
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#endif
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{
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if (__v > 0.0l)
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__v = numeric_limits<long double>::max();
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else
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__v = -numeric_limits<long double>::max();
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__err = ios_base::failbit;
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}
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setlocale(LC_ALL, __sav);
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delete [] __sav;
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}
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void
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locale::facet::_S_create_c_locale(__c_locale& __cloc, const char* __s,
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__c_locale)
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{
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// Currently, the generic model only supports the "C" locale.
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// See http://gcc.gnu.org/ml/libstdc++/2003-02/msg00345.html
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__cloc = 0;
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if (strcmp(__s, "C"))
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__throw_runtime_error(__N("locale::facet::_S_create_c_locale "
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"name not valid"));
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}
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void
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locale::facet::_S_destroy_c_locale(__c_locale& __cloc)
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{ __cloc = 0; }
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__c_locale
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locale::facet::_S_clone_c_locale(__c_locale&) throw()
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{ return __c_locale(); }
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__c_locale
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locale::facet::_S_lc_ctype_c_locale(__c_locale, const char*)
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{ return __c_locale(); }
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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const char* const category_names[6 + _GLIBCXX_NUM_CATEGORIES] =
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{
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"LC_CTYPE",
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"LC_NUMERIC",
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"LC_TIME",
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"LC_COLLATE",
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"LC_MONETARY",
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"LC_MESSAGES"
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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const char* const* const locale::_S_categories = __gnu_cxx::category_names;
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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// XXX GLIBCXX_ABI Deprecated
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#ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
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#define _GLIBCXX_LDBL_COMPAT(dbl, ldbl) \
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extern "C" void ldbl (void) __attribute__ ((alias (#dbl)))
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_GLIBCXX_LDBL_COMPAT(_ZSt14__convert_to_vIdEvPKcRT_RSt12_Ios_IostateRKPi, _ZSt14__convert_to_vIeEvPKcRT_RSt12_Ios_IostateRKPi);
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#endif // _GLIBCXX_LONG_DOUBLE_COMPAT
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