// Locale support -*- C++ -*- // Copyright (C) 1997-2020 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // . /** @file bits/locale_facets.tcc * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{locale} */ #ifndef _LOCALE_FACETS_TCC #define _LOCALE_FACETS_TCC 1 #pragma GCC system_header namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION // Routine to access a cache for the facet. If the cache didn't // exist before, it gets constructed on the fly. template struct __use_cache { const _Facet* operator() (const locale& __loc) const; }; // Specializations. template struct __use_cache<__numpunct_cache<_CharT> > { const __numpunct_cache<_CharT>* operator() (const locale& __loc) const { const size_t __i = numpunct<_CharT>::id._M_id(); const locale::facet** __caches = __loc._M_impl->_M_caches; if (!__caches[__i]) { __numpunct_cache<_CharT>* __tmp = 0; __try { __tmp = new __numpunct_cache<_CharT>; __tmp->_M_cache(__loc); } __catch(...) { delete __tmp; __throw_exception_again; } __loc._M_impl->_M_install_cache(__tmp, __i); } return static_cast*>(__caches[__i]); } }; template void __numpunct_cache<_CharT>::_M_cache(const locale& __loc) { const numpunct<_CharT>& __np = use_facet >(__loc); char* __grouping = 0; _CharT* __truename = 0; _CharT* __falsename = 0; __try { const string& __g = __np.grouping(); _M_grouping_size = __g.size(); __grouping = new char[_M_grouping_size]; __g.copy(__grouping, _M_grouping_size); _M_use_grouping = (_M_grouping_size && static_cast(__grouping[0]) > 0 && (__grouping[0] != __gnu_cxx::__numeric_traits::__max)); const basic_string<_CharT>& __tn = __np.truename(); _M_truename_size = __tn.size(); __truename = new _CharT[_M_truename_size]; __tn.copy(__truename, _M_truename_size); const basic_string<_CharT>& __fn = __np.falsename(); _M_falsename_size = __fn.size(); __falsename = new _CharT[_M_falsename_size]; __fn.copy(__falsename, _M_falsename_size); _M_decimal_point = __np.decimal_point(); _M_thousands_sep = __np.thousands_sep(); const ctype<_CharT>& __ct = use_facet >(__loc); __ct.widen(__num_base::_S_atoms_out, __num_base::_S_atoms_out + __num_base::_S_oend, _M_atoms_out); __ct.widen(__num_base::_S_atoms_in, __num_base::_S_atoms_in + __num_base::_S_iend, _M_atoms_in); _M_grouping = __grouping; _M_truename = __truename; _M_falsename = __falsename; _M_allocated = true; } __catch(...) { delete [] __grouping; delete [] __truename; delete [] __falsename; __throw_exception_again; } } // Used by both numeric and monetary facets. // Check to make sure that the __grouping_tmp string constructed in // money_get or num_get matches the canonical grouping for a given // locale. // __grouping_tmp is parsed L to R // 1,222,444 == __grouping_tmp of "\1\3\3" // __grouping is parsed R to L // 1,222,444 == __grouping of "\3" == "\3\3\3" _GLIBCXX_PURE bool __verify_grouping(const char* __grouping, size_t __grouping_size, const string& __grouping_tmp) throw (); _GLIBCXX_BEGIN_NAMESPACE_LDBL template _GLIBCXX_DEFAULT_ABI_TAG _InIter num_get<_CharT, _InIter>:: _M_extract_float(_InIter __beg, _InIter __end, ios_base& __io, ios_base::iostate& __err, string& __xtrc) const { typedef char_traits<_CharT> __traits_type; typedef __numpunct_cache<_CharT> __cache_type; __use_cache<__cache_type> __uc; const locale& __loc = __io._M_getloc(); const __cache_type* __lc = __uc(__loc); const _CharT* __lit = __lc->_M_atoms_in; char_type __c = char_type(); // True if __beg becomes equal to __end. bool __testeof = __beg == __end; // First check for sign. if (!__testeof) { __c = *__beg; const bool __plus = __c == __lit[__num_base::_S_iplus]; if ((__plus || __c == __lit[__num_base::_S_iminus]) && !(__lc->_M_use_grouping && __c == __lc->_M_thousands_sep) && !(__c == __lc->_M_decimal_point)) { __xtrc += __plus ? '+' : '-'; if (++__beg != __end) __c = *__beg; else __testeof = true; } } // Next, look for leading zeros. bool __found_mantissa = false; int __sep_pos = 0; while (!__testeof) { if ((__lc->_M_use_grouping && __c == __lc->_M_thousands_sep) || __c == __lc->_M_decimal_point) break; else if (__c == __lit[__num_base::_S_izero]) { if (!__found_mantissa) { __xtrc += '0'; __found_mantissa = true; } ++__sep_pos; if (++__beg != __end) __c = *__beg; else __testeof = true; } else break; } // Only need acceptable digits for floating point numbers. bool __found_dec = false; bool __found_sci = false; string __found_grouping; if (__lc->_M_use_grouping) __found_grouping.reserve(32); const char_type* __lit_zero = __lit + __num_base::_S_izero; if (!__lc->_M_allocated) // "C" locale while (!__testeof) { const int __digit = _M_find(__lit_zero, 10, __c); if (__digit != -1) { __xtrc += '0' + __digit; __found_mantissa = true; } else if (__c == __lc->_M_decimal_point && !__found_dec && !__found_sci) { __xtrc += '.'; __found_dec = true; } else if ((__c == __lit[__num_base::_S_ie] || __c == __lit[__num_base::_S_iE]) && !__found_sci && __found_mantissa) { // Scientific notation. __xtrc += 'e'; __found_sci = true; // Remove optional plus or minus sign, if they exist. if (++__beg != __end) { __c = *__beg; const bool __plus = __c == __lit[__num_base::_S_iplus]; if (__plus || __c == __lit[__num_base::_S_iminus]) __xtrc += __plus ? '+' : '-'; else continue; } else { __testeof = true; break; } } else break; if (++__beg != __end) __c = *__beg; else __testeof = true; } else while (!__testeof) { // According to 22.2.2.1.2, p8-9, first look for thousands_sep // and decimal_point. if (__lc->_M_use_grouping && __c == __lc->_M_thousands_sep) { if (!__found_dec && !__found_sci) { // NB: Thousands separator at the beginning of a string // is a no-no, as is two consecutive thousands separators. if (__sep_pos) { __found_grouping += static_cast(__sep_pos); __sep_pos = 0; } else { // NB: __convert_to_v will not assign __v and will // set the failbit. __xtrc.clear(); break; } } else break; } else if (__c == __lc->_M_decimal_point) { if (!__found_dec && !__found_sci) { // If no grouping chars are seen, no grouping check // is applied. Therefore __found_grouping is adjusted // only if decimal_point comes after some thousands_sep. if (__found_grouping.size()) __found_grouping += static_cast(__sep_pos); __xtrc += '.'; __found_dec = true; } else break; } else { const char_type* __q = __traits_type::find(__lit_zero, 10, __c); if (__q) { __xtrc += '0' + (__q - __lit_zero); __found_mantissa = true; ++__sep_pos; } else if ((__c == __lit[__num_base::_S_ie] || __c == __lit[__num_base::_S_iE]) && !__found_sci && __found_mantissa) { // Scientific notation. if (__found_grouping.size() && !__found_dec) __found_grouping += static_cast(__sep_pos); __xtrc += 'e'; __found_sci = true; // Remove optional plus or minus sign, if they exist. if (++__beg != __end) { __c = *__beg; const bool __plus = __c == __lit[__num_base::_S_iplus]; if ((__plus || __c == __lit[__num_base::_S_iminus]) && !(__lc->_M_use_grouping && __c == __lc->_M_thousands_sep) && !(__c == __lc->_M_decimal_point)) __xtrc += __plus ? '+' : '-'; else continue; } else { __testeof = true; break; } } else break; } if (++__beg != __end) __c = *__beg; else __testeof = true; } // Digit grouping is checked. If grouping and found_grouping don't // match, then get very very upset, and set failbit. if (__found_grouping.size()) { // Add the ending grouping if a decimal or 'e'/'E' wasn't found. if (!__found_dec && !__found_sci) __found_grouping += static_cast(__sep_pos); if (!std::__verify_grouping(__lc->_M_grouping, __lc->_M_grouping_size, __found_grouping)) __err = ios_base::failbit; } return __beg; } template template _GLIBCXX_DEFAULT_ABI_TAG _InIter num_get<_CharT, _InIter>:: _M_extract_int(_InIter __beg, _InIter __end, ios_base& __io, ios_base::iostate& __err, _ValueT& __v) const { typedef char_traits<_CharT> __traits_type; using __gnu_cxx::__add_unsigned; typedef typename __add_unsigned<_ValueT>::__type __unsigned_type; typedef __numpunct_cache<_CharT> __cache_type; __use_cache<__cache_type> __uc; const locale& __loc = __io._M_getloc(); const __cache_type* __lc = __uc(__loc); const _CharT* __lit = __lc->_M_atoms_in; char_type __c = char_type(); // NB: Iff __basefield == 0, __base can change based on contents. const ios_base::fmtflags __basefield = __io.flags() & ios_base::basefield; const bool __oct = __basefield == ios_base::oct; int __base = __oct ? 8 : (__basefield == ios_base::hex ? 16 : 10); // True if __beg becomes equal to __end. bool __testeof = __beg == __end; // First check for sign. bool __negative = false; if (!__testeof) { __c = *__beg; __negative = __c == __lit[__num_base::_S_iminus]; if ((__negative || __c == __lit[__num_base::_S_iplus]) && !(__lc->_M_use_grouping && __c == __lc->_M_thousands_sep) && !(__c == __lc->_M_decimal_point)) { if (++__beg != __end) __c = *__beg; else __testeof = true; } } // Next, look for leading zeros and check required digits // for base formats. bool __found_zero = false; int __sep_pos = 0; while (!__testeof) { if ((__lc->_M_use_grouping && __c == __lc->_M_thousands_sep) || __c == __lc->_M_decimal_point) break; else if (__c == __lit[__num_base::_S_izero] && (!__found_zero || __base == 10)) { __found_zero = true; ++__sep_pos; if (__basefield == 0) __base = 8; if (__base == 8) __sep_pos = 0; } else if (__found_zero && (__c == __lit[__num_base::_S_ix] || __c == __lit[__num_base::_S_iX])) { if (__basefield == 0) __base = 16; if (__base == 16) { __found_zero = false; __sep_pos = 0; } else break; } else break; if (++__beg != __end) { __c = *__beg; if (!__found_zero) break; } else __testeof = true; } // At this point, base is determined. If not hex, only allow // base digits as valid input. const size_t __len = (__base == 16 ? __num_base::_S_iend - __num_base::_S_izero : __base); // Extract. typedef __gnu_cxx::__numeric_traits<_ValueT> __num_traits; string __found_grouping; if (__lc->_M_use_grouping) __found_grouping.reserve(32); bool __testfail = false; bool __testoverflow = false; const __unsigned_type __max = (__negative && __num_traits::__is_signed_val) ? -static_cast<__unsigned_type>(__num_traits::__min) : __num_traits::__max; const __unsigned_type __smax = __max / __base; __unsigned_type __result = 0; int __digit = 0; const char_type* __lit_zero = __lit + __num_base::_S_izero; if (!__lc->_M_allocated) // "C" locale while (!__testeof) { __digit = _M_find(__lit_zero, __len, __c); if (__digit == -1) break; if (__result > __smax) __testoverflow = true; else { __result *= __base; __testoverflow |= __result > __max - __digit; __result += __digit; ++__sep_pos; } if (++__beg != __end) __c = *__beg; else __testeof = true; } else while (!__testeof) { // According to 22.2.2.1.2, p8-9, first look for thousands_sep // and decimal_point. if (__lc->_M_use_grouping && __c == __lc->_M_thousands_sep) { // NB: Thousands separator at the beginning of a string // is a no-no, as is two consecutive thousands separators. if (__sep_pos) { __found_grouping += static_cast(__sep_pos); __sep_pos = 0; } else { __testfail = true; break; } } else if (__c == __lc->_M_decimal_point) break; else { const char_type* __q = __traits_type::find(__lit_zero, __len, __c); if (!__q) break; __digit = __q - __lit_zero; if (__digit > 15) __digit -= 6; if (__result > __smax) __testoverflow = true; else { __result *= __base; __testoverflow |= __result > __max - __digit; __result += __digit; ++__sep_pos; } } if (++__beg != __end) __c = *__beg; else __testeof = true; } // Digit grouping is checked. If grouping and found_grouping don't // match, then get very very upset, and set failbit. if (__found_grouping.size()) { // Add the ending grouping. __found_grouping += static_cast(__sep_pos); if (!std::__verify_grouping(__lc->_M_grouping, __lc->_M_grouping_size, __found_grouping)) __err = ios_base::failbit; } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 23. Num_get overflow result. if ((!__sep_pos && !__found_zero && !__found_grouping.size()) || __testfail) { __v = 0; __err = ios_base::failbit; } else if (__testoverflow) { if (__negative && __num_traits::__is_signed_val) __v = __num_traits::__min; else __v = __num_traits::__max; __err = ios_base::failbit; } else __v = __negative ? -__result : __result; if (__testeof) __err |= ios_base::eofbit; return __beg; } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 17. Bad bool parsing template _InIter num_get<_CharT, _InIter>:: do_get(iter_type __beg, iter_type __end, ios_base& __io, ios_base::iostate& __err, bool& __v) const { if (!(__io.flags() & ios_base::boolalpha)) { // Parse bool values as long. // NB: We can't just call do_get(long) here, as it might // refer to a derived class. long __l = -1; __beg = _M_extract_int(__beg, __end, __io, __err, __l); if (__l == 0 || __l == 1) __v = bool(__l); else { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 23. Num_get overflow result. __v = true; __err = ios_base::failbit; if (__beg == __end) __err |= ios_base::eofbit; } } else { // Parse bool values as alphanumeric. typedef __numpunct_cache<_CharT> __cache_type; __use_cache<__cache_type> __uc; const locale& __loc = __io._M_getloc(); const __cache_type* __lc = __uc(__loc); bool __testf = true; bool __testt = true; bool __donef = __lc->_M_falsename_size == 0; bool __donet = __lc->_M_truename_size == 0; bool __testeof = false; size_t __n = 0; while (!__donef || !__donet) { if (__beg == __end) { __testeof = true; break; } const char_type __c = *__beg; if (!__donef) __testf = __c == __lc->_M_falsename[__n]; if (!__testf && __donet) break; if (!__donet) __testt = __c == __lc->_M_truename[__n]; if (!__testt && __donef) break; if (!__testt && !__testf) break; ++__n; ++__beg; __donef = !__testf || __n >= __lc->_M_falsename_size; __donet = !__testt || __n >= __lc->_M_truename_size; } if (__testf && __n == __lc->_M_falsename_size && __n) { __v = false; if (__testt && __n == __lc->_M_truename_size) __err = ios_base::failbit; else __err = __testeof ? ios_base::eofbit : ios_base::goodbit; } else if (__testt && __n == __lc->_M_truename_size && __n) { __v = true; __err = __testeof ? ios_base::eofbit : ios_base::goodbit; } else { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 23. Num_get overflow result. __v = false; __err = ios_base::failbit; if (__testeof) __err |= ios_base::eofbit; } } return __beg; } template _InIter num_get<_CharT, _InIter>:: do_get(iter_type __beg, iter_type __end, ios_base& __io, ios_base::iostate& __err, float& __v) const { string __xtrc; __xtrc.reserve(32); __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc); std::__convert_to_v(__xtrc.c_str(), __v, __err, _S_get_c_locale()); if (__beg == __end) __err |= ios_base::eofbit; return __beg; } template _InIter num_get<_CharT, _InIter>:: do_get(iter_type __beg, iter_type __end, ios_base& __io, ios_base::iostate& __err, double& __v) const { string __xtrc; __xtrc.reserve(32); __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc); std::__convert_to_v(__xtrc.c_str(), __v, __err, _S_get_c_locale()); if (__beg == __end) __err |= ios_base::eofbit; return __beg; } #if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__ template _InIter num_get<_CharT, _InIter>:: __do_get(iter_type __beg, iter_type __end, ios_base& __io, ios_base::iostate& __err, double& __v) const { string __xtrc; __xtrc.reserve(32); __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc); std::__convert_to_v(__xtrc.c_str(), __v, __err, _S_get_c_locale()); if (__beg == __end) __err |= ios_base::eofbit; return __beg; } #endif template _InIter num_get<_CharT, _InIter>:: do_get(iter_type __beg, iter_type __end, ios_base& __io, ios_base::iostate& __err, long double& __v) const { string __xtrc; __xtrc.reserve(32); __beg = _M_extract_float(__beg, __end, __io, __err, __xtrc); std::__convert_to_v(__xtrc.c_str(), __v, __err, _S_get_c_locale()); if (__beg == __end) __err |= ios_base::eofbit; return __beg; } template _InIter num_get<_CharT, _InIter>:: do_get(iter_type __beg, iter_type __end, ios_base& __io, ios_base::iostate& __err, void*& __v) const { // Prepare for hex formatted input. typedef ios_base::fmtflags fmtflags; const fmtflags __fmt = __io.flags(); __io.flags((__fmt & ~ios_base::basefield) | ios_base::hex); typedef __gnu_cxx::__conditional_type<(sizeof(void*) <= sizeof(unsigned long)), unsigned long, unsigned long long>::__type _UIntPtrType; _UIntPtrType __ul; __beg = _M_extract_int(__beg, __end, __io, __err, __ul); // Reset from hex formatted input. __io.flags(__fmt); __v = reinterpret_cast(__ul); return __beg; } // For use by integer and floating-point types after they have been // converted into a char_type string. template void num_put<_CharT, _OutIter>:: _M_pad(_CharT __fill, streamsize __w, ios_base& __io, _CharT* __new, const _CharT* __cs, int& __len) const { // [22.2.2.2.2] Stage 3. // If necessary, pad. __pad<_CharT, char_traits<_CharT> >::_S_pad(__io, __fill, __new, __cs, __w, __len); __len = static_cast(__w); } _GLIBCXX_END_NAMESPACE_LDBL template int __int_to_char(_CharT* __bufend, _ValueT __v, const _CharT* __lit, ios_base::fmtflags __flags, bool __dec) { _CharT* __buf = __bufend; if (__builtin_expect(__dec, true)) { // Decimal. do { *--__buf = __lit[(__v % 10) + __num_base::_S_odigits]; __v /= 10; } while (__v != 0); } else if ((__flags & ios_base::basefield) == ios_base::oct) { // Octal. do { *--__buf = __lit[(__v & 0x7) + __num_base::_S_odigits]; __v >>= 3; } while (__v != 0); } else { // Hex. const bool __uppercase = __flags & ios_base::uppercase; const int __case_offset = __uppercase ? __num_base::_S_oudigits : __num_base::_S_odigits; do { *--__buf = __lit[(__v & 0xf) + __case_offset]; __v >>= 4; } while (__v != 0); } return __bufend - __buf; } _GLIBCXX_BEGIN_NAMESPACE_LDBL template void num_put<_CharT, _OutIter>:: _M_group_int(const char* __grouping, size_t __grouping_size, _CharT __sep, ios_base&, _CharT* __new, _CharT* __cs, int& __len) const { _CharT* __p = std::__add_grouping(__new, __sep, __grouping, __grouping_size, __cs, __cs + __len); __len = __p - __new; } template template _OutIter num_put<_CharT, _OutIter>:: _M_insert_int(_OutIter __s, ios_base& __io, _CharT __fill, _ValueT __v) const { using __gnu_cxx::__add_unsigned; typedef typename __add_unsigned<_ValueT>::__type __unsigned_type; typedef __numpunct_cache<_CharT> __cache_type; __use_cache<__cache_type> __uc; const locale& __loc = __io._M_getloc(); const __cache_type* __lc = __uc(__loc); const _CharT* __lit = __lc->_M_atoms_out; const ios_base::fmtflags __flags = __io.flags(); // Long enough to hold hex, dec, and octal representations. const int __ilen = 5 * sizeof(_ValueT); _CharT* __cs = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __ilen)); // [22.2.2.2.2] Stage 1, numeric conversion to character. // Result is returned right-justified in the buffer. const ios_base::fmtflags __basefield = __flags & ios_base::basefield; const bool __dec = (__basefield != ios_base::oct && __basefield != ios_base::hex); const __unsigned_type __u = ((__v > 0 || !__dec) ? __unsigned_type(__v) : -__unsigned_type(__v)); int __len = __int_to_char(__cs + __ilen, __u, __lit, __flags, __dec); __cs += __ilen - __len; // Add grouping, if necessary. if (__lc->_M_use_grouping) { // Grouping can add (almost) as many separators as the number // of digits + space is reserved for numeric base or sign. _CharT* __cs2 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * (__len + 1) * 2)); _M_group_int(__lc->_M_grouping, __lc->_M_grouping_size, __lc->_M_thousands_sep, __io, __cs2 + 2, __cs, __len); __cs = __cs2 + 2; } // Complete Stage 1, prepend numeric base or sign. if (__builtin_expect(__dec, true)) { // Decimal. if (__v >= 0) { if (bool(__flags & ios_base::showpos) && __gnu_cxx::__numeric_traits<_ValueT>::__is_signed_val) *--__cs = __lit[__num_base::_S_oplus], ++__len; } else *--__cs = __lit[__num_base::_S_ominus], ++__len; } else if (bool(__flags & ios_base::showbase) && __v) { if (__basefield == ios_base::oct) *--__cs = __lit[__num_base::_S_odigits], ++__len; else { // 'x' or 'X' const bool __uppercase = __flags & ios_base::uppercase; *--__cs = __lit[__num_base::_S_ox + __uppercase]; // '0' *--__cs = __lit[__num_base::_S_odigits]; __len += 2; } } // Pad. const streamsize __w = __io.width(); if (__w > static_cast(__len)) { _CharT* __cs3 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __w)); _M_pad(__fill, __w, __io, __cs3, __cs, __len); __cs = __cs3; } __io.width(0); // [22.2.2.2.2] Stage 4. // Write resulting, fully-formatted string to output iterator. return std::__write(__s, __cs, __len); } template void num_put<_CharT, _OutIter>:: _M_group_float(const char* __grouping, size_t __grouping_size, _CharT __sep, const _CharT* __p, _CharT* __new, _CharT* __cs, int& __len) const { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 282. What types does numpunct grouping refer to? // Add grouping, if necessary. const int __declen = __p ? __p - __cs : __len; _CharT* __p2 = std::__add_grouping(__new, __sep, __grouping, __grouping_size, __cs, __cs + __declen); // Tack on decimal part. int __newlen = __p2 - __new; if (__p) { char_traits<_CharT>::copy(__p2, __p, __len - __declen); __newlen += __len - __declen; } __len = __newlen; } // The following code uses vsnprintf (or vsprintf(), when // _GLIBCXX_USE_C99_STDIO is not defined) to convert floating point // values for insertion into a stream. An optimization would be to // replace them with code that works directly on a wide buffer and // then use __pad to do the padding. It would be good to replace // them anyway to gain back the efficiency that C++ provides by // knowing up front the type of the values to insert. Also, sprintf // is dangerous since may lead to accidental buffer overruns. This // implementation follows the C++ standard fairly directly as // outlined in 22.2.2.2 [lib.locale.num.put] template template _OutIter num_put<_CharT, _OutIter>:: _M_insert_float(_OutIter __s, ios_base& __io, _CharT __fill, char __mod, _ValueT __v) const { typedef __numpunct_cache<_CharT> __cache_type; __use_cache<__cache_type> __uc; const locale& __loc = __io._M_getloc(); const __cache_type* __lc = __uc(__loc); // Use default precision if out of range. const streamsize __prec = __io.precision() < 0 ? 6 : __io.precision(); const int __max_digits = __gnu_cxx::__numeric_traits<_ValueT>::__digits10; // [22.2.2.2.2] Stage 1, numeric conversion to character. int __len; // Long enough for the max format spec. char __fbuf[16]; __num_base::_S_format_float(__io, __fbuf, __mod); #if _GLIBCXX_USE_C99_STDIO && !_GLIBCXX_HAVE_BROKEN_VSNPRINTF // Precision is always used except for hexfloat format. const bool __use_prec = (__io.flags() & ios_base::floatfield) != ios_base::floatfield; // First try a buffer perhaps big enough (most probably sufficient // for non-ios_base::fixed outputs) int __cs_size = __max_digits * 3; char* __cs = static_cast(__builtin_alloca(__cs_size)); if (__use_prec) __len = std::__convert_from_v(_S_get_c_locale(), __cs, __cs_size, __fbuf, __prec, __v); else __len = std::__convert_from_v(_S_get_c_locale(), __cs, __cs_size, __fbuf, __v); // If the buffer was not large enough, try again with the correct size. if (__len >= __cs_size) { __cs_size = __len + 1; __cs = static_cast(__builtin_alloca(__cs_size)); if (__use_prec) __len = std::__convert_from_v(_S_get_c_locale(), __cs, __cs_size, __fbuf, __prec, __v); else __len = std::__convert_from_v(_S_get_c_locale(), __cs, __cs_size, __fbuf, __v); } #else // Consider the possibility of long ios_base::fixed outputs const bool __fixed = __io.flags() & ios_base::fixed; const int __max_exp = __gnu_cxx::__numeric_traits<_ValueT>::__max_exponent10; // The size of the output string is computed as follows. // ios_base::fixed outputs may need up to __max_exp + 1 chars // for the integer part + __prec chars for the fractional part // + 3 chars for sign, decimal point, '\0'. On the other hand, // for non-fixed outputs __max_digits * 2 + __prec chars are // largely sufficient. const int __cs_size = __fixed ? __max_exp + __prec + 4 : __max_digits * 2 + __prec; char* __cs = static_cast(__builtin_alloca(__cs_size)); __len = std::__convert_from_v(_S_get_c_locale(), __cs, 0, __fbuf, __prec, __v); #endif // [22.2.2.2.2] Stage 2, convert to char_type, using correct // numpunct.decimal_point() values for '.' and adding grouping. const ctype<_CharT>& __ctype = use_facet >(__loc); _CharT* __ws = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __len)); __ctype.widen(__cs, __cs + __len, __ws); // Replace decimal point. _CharT* __wp = 0; const char* __p = char_traits::find(__cs, __len, '.'); if (__p) { __wp = __ws + (__p - __cs); *__wp = __lc->_M_decimal_point; } // Add grouping, if necessary. // N.B. Make sure to not group things like 2e20, i.e., no decimal // point, scientific notation. if (__lc->_M_use_grouping && (__wp || __len < 3 || (__cs[1] <= '9' && __cs[2] <= '9' && __cs[1] >= '0' && __cs[2] >= '0'))) { // Grouping can add (almost) as many separators as the // number of digits, but no more. _CharT* __ws2 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __len * 2)); streamsize __off = 0; if (__cs[0] == '-' || __cs[0] == '+') { __off = 1; __ws2[0] = __ws[0]; __len -= 1; } _M_group_float(__lc->_M_grouping, __lc->_M_grouping_size, __lc->_M_thousands_sep, __wp, __ws2 + __off, __ws + __off, __len); __len += __off; __ws = __ws2; } // Pad. const streamsize __w = __io.width(); if (__w > static_cast(__len)) { _CharT* __ws3 = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __w)); _M_pad(__fill, __w, __io, __ws3, __ws, __len); __ws = __ws3; } __io.width(0); // [22.2.2.2.2] Stage 4. // Write resulting, fully-formatted string to output iterator. return std::__write(__s, __ws, __len); } template _OutIter num_put<_CharT, _OutIter>:: do_put(iter_type __s, ios_base& __io, char_type __fill, bool __v) const { const ios_base::fmtflags __flags = __io.flags(); if ((__flags & ios_base::boolalpha) == 0) { const long __l = __v; __s = _M_insert_int(__s, __io, __fill, __l); } else { typedef __numpunct_cache<_CharT> __cache_type; __use_cache<__cache_type> __uc; const locale& __loc = __io._M_getloc(); const __cache_type* __lc = __uc(__loc); const _CharT* __name = __v ? __lc->_M_truename : __lc->_M_falsename; int __len = __v ? __lc->_M_truename_size : __lc->_M_falsename_size; const streamsize __w = __io.width(); if (__w > static_cast(__len)) { const streamsize __plen = __w - __len; _CharT* __ps = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) * __plen)); char_traits<_CharT>::assign(__ps, __plen, __fill); __io.width(0); if ((__flags & ios_base::adjustfield) == ios_base::left) { __s = std::__write(__s, __name, __len); __s = std::__write(__s, __ps, __plen); } else { __s = std::__write(__s, __ps, __plen); __s = std::__write(__s, __name, __len); } return __s; } __io.width(0); __s = std::__write(__s, __name, __len); } return __s; } template _OutIter num_put<_CharT, _OutIter>:: do_put(iter_type __s, ios_base& __io, char_type __fill, double __v) const { return _M_insert_float(__s, __io, __fill, char(), __v); } #if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined __LONG_DOUBLE_128__ template _OutIter num_put<_CharT, _OutIter>:: __do_put(iter_type __s, ios_base& __io, char_type __fill, double __v) const { return _M_insert_float(__s, __io, __fill, char(), __v); } #endif template _OutIter num_put<_CharT, _OutIter>:: do_put(iter_type __s, ios_base& __io, char_type __fill, long double __v) const { return _M_insert_float(__s, __io, __fill, 'L', __v); } template _OutIter num_put<_CharT, _OutIter>:: do_put(iter_type __s, ios_base& __io, char_type __fill, const void* __v) const { const ios_base::fmtflags __flags = __io.flags(); const ios_base::fmtflags __fmt = ~(ios_base::basefield | ios_base::uppercase); __io.flags((__flags & __fmt) | (ios_base::hex | ios_base::showbase)); typedef __gnu_cxx::__conditional_type<(sizeof(const void*) <= sizeof(unsigned long)), unsigned long, unsigned long long>::__type _UIntPtrType; __s = _M_insert_int(__s, __io, __fill, reinterpret_cast<_UIntPtrType>(__v)); __io.flags(__flags); return __s; } _GLIBCXX_END_NAMESPACE_LDBL // Construct correctly padded string, as per 22.2.2.2.2 // Assumes // __newlen > __oldlen // __news is allocated for __newlen size // NB: Of the two parameters, _CharT can be deduced from the // function arguments. The other (_Traits) has to be explicitly specified. template void __pad<_CharT, _Traits>::_S_pad(ios_base& __io, _CharT __fill, _CharT* __news, const _CharT* __olds, streamsize __newlen, streamsize __oldlen) { const size_t __plen = static_cast(__newlen - __oldlen); const ios_base::fmtflags __adjust = __io.flags() & ios_base::adjustfield; // Padding last. if (__adjust == ios_base::left) { _Traits::copy(__news, __olds, __oldlen); _Traits::assign(__news + __oldlen, __plen, __fill); return; } size_t __mod = 0; if (__adjust == ios_base::internal) { // Pad after the sign, if there is one. // Pad after 0[xX], if there is one. // Who came up with these rules, anyway? Jeeze. const locale& __loc = __io._M_getloc(); const ctype<_CharT>& __ctype = use_facet >(__loc); if (__ctype.widen('-') == __olds[0] || __ctype.widen('+') == __olds[0]) { __news[0] = __olds[0]; __mod = 1; ++__news; } else if (__ctype.widen('0') == __olds[0] && __oldlen > 1 && (__ctype.widen('x') == __olds[1] || __ctype.widen('X') == __olds[1])) { __news[0] = __olds[0]; __news[1] = __olds[1]; __mod = 2; __news += 2; } // else Padding first. } _Traits::assign(__news, __plen, __fill); _Traits::copy(__news + __plen, __olds + __mod, __oldlen - __mod); } template _CharT* __add_grouping(_CharT* __s, _CharT __sep, const char* __gbeg, size_t __gsize, const _CharT* __first, const _CharT* __last) { size_t __idx = 0; size_t __ctr = 0; while (__last - __first > __gbeg[__idx] && static_cast(__gbeg[__idx]) > 0 && __gbeg[__idx] != __gnu_cxx::__numeric_traits::__max) { __last -= __gbeg[__idx]; __idx < __gsize - 1 ? ++__idx : ++__ctr; } while (__first != __last) *__s++ = *__first++; while (__ctr--) { *__s++ = __sep; for (char __i = __gbeg[__idx]; __i > 0; --__i) *__s++ = *__first++; } while (__idx--) { *__s++ = __sep; for (char __i = __gbeg[__idx]; __i > 0; --__i) *__s++ = *__first++; } return __s; } // Inhibit implicit instantiations for required instantiations, // which are defined via explicit instantiations elsewhere. #if _GLIBCXX_EXTERN_TEMPLATE extern template class _GLIBCXX_NAMESPACE_CXX11 numpunct; extern template class _GLIBCXX_NAMESPACE_CXX11 numpunct_byname; extern template class _GLIBCXX_NAMESPACE_LDBL num_get; extern template class _GLIBCXX_NAMESPACE_LDBL num_put; extern template class ctype_byname; extern template const ctype& use_facet >(const locale&); extern template const numpunct& use_facet >(const locale&); extern template const num_put& use_facet >(const locale&); extern template const num_get& use_facet >(const locale&); extern template bool has_facet >(const locale&); extern template bool has_facet >(const locale&); extern template bool has_facet >(const locale&); extern template bool has_facet >(const locale&); #ifdef _GLIBCXX_USE_WCHAR_T extern template class _GLIBCXX_NAMESPACE_CXX11 numpunct; extern template class _GLIBCXX_NAMESPACE_CXX11 numpunct_byname; extern template class _GLIBCXX_NAMESPACE_LDBL num_get; extern template class _GLIBCXX_NAMESPACE_LDBL num_put; extern template class ctype_byname; extern template const ctype& use_facet >(const locale&); extern template const numpunct& use_facet >(const locale&); extern template const num_put& use_facet >(const locale&); extern template const num_get& use_facet >(const locale&); extern template bool has_facet >(const locale&); extern template bool has_facet >(const locale&); extern template bool has_facet >(const locale&); extern template bool has_facet >(const locale&); #endif #endif _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif