// String based streams -*- C++ -*- // Copyright (C) 1997, 1998, 1999, 2001, 2002, 2003, 2004 // 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 2, 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. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING. If not, write to the Free // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, // USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. /** @file sstream.tcc * This is an internal header file, included by other library headers. * You should not attempt to use it directly. */ // // ISO C++ 14882: 27.7 String-based streams // #ifndef _SSTREAM_TCC #define _SSTREAM_TCC 1 #pragma GCC system_header #include namespace std { template typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type basic_stringbuf<_CharT, _Traits, _Alloc>:: pbackfail(int_type __c) { int_type __ret = traits_type::eof(); if (this->eback() < this->gptr()) { // Try to put back __c into input sequence in one of three ways. // Order these tests done in is unspecified by the standard. const bool __testeof = traits_type::eq_int_type(__c, __ret); if (!__testeof) { const bool __testeq = traits_type::eq(traits_type:: to_char_type(__c), this->gptr()[-1]); const bool __testout = this->_M_mode & ios_base::out; if (__testeq || __testout) { this->gbump(-1); if (!__testeq) *this->gptr() = traits_type::to_char_type(__c); __ret = __c; } } else { this->gbump(-1); __ret = traits_type::not_eof(__c); } } return __ret; } template typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type basic_stringbuf<_CharT, _Traits, _Alloc>:: overflow(int_type __c) { const bool __testout = this->_M_mode & ios_base::out; if (__builtin_expect(!__testout, false)) return traits_type::eof(); const bool __testeof = traits_type::eq_int_type(__c, traits_type::eof()); if (__builtin_expect(__testeof, false)) return traits_type::not_eof(__c); const __size_type __capacity = _M_string.capacity(); const __size_type __max_size = _M_string.max_size(); const bool __testput = this->pptr() < this->epptr(); if (__builtin_expect(!__testput && __capacity == __max_size, false)) return traits_type::eof(); // Try to append __c into output sequence in one of two ways. // Order these tests done in is unspecified by the standard. if (!__testput) { // NB: Start ostringstream buffers at 512 chars. This is an // experimental value (pronounced "arbitrary" in some of the // hipper english-speaking countries), and can be changed to // suit particular needs. // Then, in virtue of DR 169 (TC) we are allowed to grow more // than one char. const __size_type __opt_len = std::max(__size_type(2 * __capacity), __size_type(512)); const __size_type __len = std::min(__opt_len, __max_size); __string_type __tmp; __tmp.reserve(__len); if (this->pbase()) __tmp.assign(this->pbase(), this->epptr() - this->pbase()); _M_string.swap(__tmp); _M_sync(const_cast(_M_string.data()), this->gptr() - this->eback(), this->pptr() - this->pbase()); } return this->sputc(traits_type::to_char_type(__c)); } template typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type basic_stringbuf<_CharT, _Traits, _Alloc>:: underflow() { int_type __ret = traits_type::eof(); const bool __testin = this->_M_mode & ios_base::in; if (__testin) { // Update egptr() to match the actual string end. _M_update_egptr(); if (this->gptr() < this->egptr()) __ret = traits_type::to_int_type(*this->gptr()); } return __ret; } template typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type basic_stringbuf<_CharT, _Traits, _Alloc>:: seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode) { pos_type __ret = pos_type(off_type(-1)); bool __testin = (ios_base::in & this->_M_mode & __mode) != 0; bool __testout = (ios_base::out & this->_M_mode & __mode) != 0; const bool __testboth = __testin && __testout && __way != ios_base::cur; __testin &= !(__mode & ios_base::out); __testout &= !(__mode & ios_base::in); // _GLIBCXX_RESOLVE_LIB_DEFECTS // 453. basic_stringbuf::seekoff need not always fail for an empty stream. const char_type* __beg = __testin ? this->eback() : this->pbase(); if ((__beg || !__off) && (__testin || __testout || __testboth)) { _M_update_egptr(); off_type __newoffi = __off; off_type __newoffo = __newoffi; if (__way == ios_base::cur) { __newoffi += this->gptr() - __beg; __newoffo += this->pptr() - __beg; } else if (__way == ios_base::end) __newoffo = __newoffi += this->egptr() - __beg; if ((__testin || __testboth) && __newoffi >= 0 && this->egptr() - __beg >= __newoffi) { this->gbump((__beg + __newoffi) - this->gptr()); __ret = pos_type(__newoffi); } if ((__testout || __testboth) && __newoffo >= 0 && this->egptr() - __beg >= __newoffo) { this->pbump((__beg + __newoffo) - this->pptr()); __ret = pos_type(__newoffo); } } return __ret; } template typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type basic_stringbuf<_CharT, _Traits, _Alloc>:: seekpos(pos_type __sp, ios_base::openmode __mode) { pos_type __ret = pos_type(off_type(-1)); const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0; const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0; const char_type* __beg = __testin ? this->eback() : this->pbase(); if (__beg && (__testin || __testout)) { _M_update_egptr(); const off_type __pos(__sp); const bool __testpos = 0 <= __pos && __pos <= this->egptr() - __beg; if (__testpos) { if (__testin) this->gbump((__beg + __pos) - this->gptr()); if (__testout) this->pbump((__beg + __pos) - this->pptr()); __ret = __sp; } } return __ret; } // Inhibit implicit instantiations for required instantiations, // which are defined via explicit instantiations elsewhere. // NB: This syntax is a GNU extension. #if _GLIBCXX_EXTERN_TEMPLATE extern template class basic_stringbuf; extern template class basic_istringstream; extern template class basic_ostringstream; extern template class basic_stringstream; #ifdef _GLIBCXX_USE_WCHAR_T extern template class basic_stringbuf; extern template class basic_istringstream; extern template class basic_ostringstream; extern template class basic_stringstream; #endif #endif } // namespace std #endif