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Whole document tree                   sstream.tcc Go to the documentation of this file. // String based streams -*- C++ -*- // Copyright (C) 1997-1999, 2001 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. // // ISO C++ 14882: 27.7 String-based streams // #ifndef _CPP_BITS_SSTREAM_TCC #define _CPP_BITS_SSTREAM_TCC 1 #include <bits/std_sstream.h> namespace std { template <class _CharT, class _Traits, class _Alloc> typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type basic_stringbuf<_CharT, _Traits, _Alloc>:: pbackfail(int_type __c) { int_type __ret = traits_type::eof(); bool __testeof = traits_type::eq_int_type(__c, traits_type::eof()); bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur; // Try to put back __c into input sequence in one of three ways. // Order these tests done in is unspecified by the standard. if (__testpos) { if (traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1]) && !__testeof) { --_M_in_cur; __ret = __c; } else if (!__testeof) { --_M_in_cur; *_M_in_cur = traits_type::to_char_type(__c); __ret = __c; } else if (__testeof) { --_M_in_cur; __ret = traits_type::not_eof(__c); } } return __ret; } template <class _CharT, class _Traits, class _Alloc> typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type basic_stringbuf<_CharT, _Traits, _Alloc>:: overflow(int_type __c) { int_type __ret = traits_type::eof(); bool __testeof = traits_type::eq_int_type(__c, __ret); bool __testwrite = _M_out_cur < _M_buf + _M_buf_size; bool __testout = _M_mode & ios_base::out; // Try to append __c into output sequence in one of two ways. // Order these tests done in is unspecified by the standard. if (__testout) { if (!__testeof) { __size_type __len = max(_M_buf_size, _M_buf_size_opt); __len *= 2; if (__testwrite) __ret = this->sputc(__c); else if (__len <= _M_string.max_size()) { // Force-allocate, re-sync. _M_string = this->str(); _M_string.reserve(__len); _M_buf_size = static_cast<int_type>(__len); _M_really_sync(_M_in_cur - _M_in_beg, _M_out_cur - _M_out_beg); *_M_out_cur = traits_type::to_char_type(__c); _M_out_cur_move(1); __ret = __c; } } else __ret = traits_type::not_eof(__c); } return __ret; } template <class _CharT, class _Traits, class _Alloc> 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 = __mode & ios_base::in && _M_mode & ios_base::in; bool __testout = __mode & ios_base::out && _M_mode & ios_base::out; bool __testboth = __testin && __testout && __way != ios_base::cur; if (_M_buf_size && ((__testin != __testout) || __testboth)) { char_type* __beg = _M_buf; char_type* __curi = NULL; char_type* __curo = NULL; char_type* __endi = NULL; char_type* __endo = NULL; if (__testin) { __curi = this->gptr(); __endi = this->egptr(); } if (__testout) { __curo = this->pptr(); __endo = this->epptr(); } off_type __newoffi = 0; off_type __newoffo = 0; if (__way == ios_base::cur) { __newoffi = __curi - __beg; __newoffo = __curo - __beg; } else if (__way == ios_base::end) { __newoffi = __endi - __beg; __newoffo = __endo - __beg; } if (__testin && __newoffi + __off >= 0 && __endi - __beg >= __newoffi + __off) { _M_in_cur = __beg + __newoffi + __off; __ret = pos_type(__newoffi); } if (__testout && __newoffo + __off >= 0 && __endo - __beg >= __newoffo + __off) { _M_out_cur_move(__newoffo + __off - (_M_out_cur - __beg)); __ret = pos_type(__newoffo); } } return __ret; } template <class _CharT, class _Traits, class _Alloc> 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)); off_type __pos = __sp._M_position(); char_type* __beg = NULL; char_type* __end = NULL; bool __testin = __mode & ios_base::in && _M_mode & ios_base::in; bool __testout = __mode & ios_base::out && _M_mode & ios_base::out; if (__testin) { __beg = this->eback(); __end = this->egptr(); } if (__testout) { __beg = this->pbase(); __end = _M_buf + _M_buf_size; } if (0 <= __pos && __pos <= __end - __beg) { // Need to set both of these if applicable if (__testin) _M_in_cur = _M_in_beg + __pos; if (__testout) _M_out_cur_move((__pos) - (_M_out_cur - __beg)); __ret = pos_type(off_type(__pos)); } return __ret; } } // namespace std #endif /* _CPP_BITS_SSTREAM_TCC */