sstream.tcc

00001 // String based streams -*- C++ -*-
00002 
00003 // Copyright (C) 1997, 1998, 1999, 2001, 2002
00004 // Free Software Foundation, Inc.
00005 //
00006 // This file is part of the GNU ISO C++ Library.  This library is free
00007 // software; you can redistribute it and/or modify it under the
00008 // terms of the GNU General Public License as published by the
00009 // Free Software Foundation; either version 2, or (at your option)
00010 // any later version.
00011 
00012 // This library is distributed in the hope that it will be useful,
00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015 // GNU General Public License for more details.
00016 
00017 // You should have received a copy of the GNU General Public License along
00018 // with this library; see the file COPYING.  If not, write to the Free
00019 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00020 // USA.
00021 
00022 // As a special exception, you may use this file as part of a free software
00023 // library without restriction.  Specifically, if other files instantiate
00024 // templates or use macros or inline functions from this file, or you compile
00025 // this file and link it with other files to produce an executable, this
00026 // file does not by itself cause the resulting executable to be covered by
00027 // the GNU General Public License.  This exception does not however
00028 // invalidate any other reasons why the executable file might be covered by
00029 // the GNU General Public License.
00030 
00031 //
00032 // ISO C++ 14882: 27.7  String-based streams
00033 //
00034 
00035 #ifndef _CPP_BITS_SSTREAM_TCC
00036 #define _CPP_BITS_SSTREAM_TCC   1
00037 
00038 #pragma GCC system_header
00039 
00040 #include <sstream>
00041 
00042 namespace std
00043 {
00044   template <class _CharT, class _Traits, class _Alloc>
00045     typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type 
00046     basic_stringbuf<_CharT, _Traits, _Alloc>::
00047     pbackfail(int_type __c)
00048     {
00049       int_type __ret = traits_type::eof();
00050       bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
00051       bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur; 
00052       
00053       // Try to put back __c into input sequence in one of three ways.
00054       // Order these tests done in is unspecified by the standard.
00055       if (__testpos)
00056     {
00057       if (traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])
00058           && !__testeof)
00059         {
00060           --_M_in_cur;
00061           __ret = __c;
00062         }
00063       else if (!__testeof)
00064         {
00065           --_M_in_cur;
00066           *_M_in_cur = traits_type::to_char_type(__c);
00067           __ret = __c;
00068         }
00069       else if (__testeof)
00070         {
00071           --_M_in_cur;
00072           __ret = traits_type::not_eof(__c);
00073         }
00074     }
00075       return __ret;
00076     }
00077   
00078   template <class _CharT, class _Traits, class _Alloc>
00079     typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type 
00080     basic_stringbuf<_CharT, _Traits, _Alloc>::
00081     overflow(int_type __c)
00082     {
00083       int_type __ret = traits_type::eof();
00084       bool __testeof = traits_type::eq_int_type(__c, __ret);
00085       bool __testwrite = _M_out_cur < _M_buf + _M_buf_size;
00086       bool __testout = _M_mode & ios_base::out;
00087 
00088       // Try to append __c into output sequence in one of two ways.
00089       // Order these tests done in is unspecified by the standard.
00090       if (__testout)
00091     {
00092       if (!__testeof)
00093         {
00094           __size_type __len = max(_M_buf_size, _M_buf_size_opt);
00095           __len *= 2;
00096 
00097           if (__testwrite)
00098         __ret = this->sputc(traits_type::to_char_type(__c));
00099           else if (__len <= _M_string.max_size())
00100         {
00101           // Force-allocate, re-sync.
00102           _M_string = this->str();
00103           _M_string.reserve(__len);
00104           _M_buf_size = __len;
00105           _M_really_sync(_M_in_cur - _M_in_beg, 
00106                  _M_out_cur - _M_out_beg);
00107           *_M_out_cur = traits_type::to_char_type(__c);
00108           _M_out_cur_move(1);
00109           __ret = __c;
00110         }
00111         }
00112       else
00113         __ret = traits_type::not_eof(__c);
00114     }
00115       return __ret;
00116     }
00117 
00118   template <class _CharT, class _Traits, class _Alloc>
00119     typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
00120     basic_stringbuf<_CharT, _Traits, _Alloc>::
00121     seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
00122     {
00123       pos_type __ret =  pos_type(off_type(-1)); 
00124       bool __testin = (ios_base::in & _M_mode & __mode) != 0;
00125       bool __testout = (ios_base::out & _M_mode & __mode) != 0;
00126       bool __testboth = __testin && __testout && __way != ios_base::cur;
00127       __testin &= !(__mode & ios_base::out);
00128       __testout &= !(__mode & ios_base::in);
00129 
00130       if (_M_buf_size && (__testin || __testout || __testboth))
00131     {
00132       char_type* __beg = _M_buf;
00133       char_type* __curi = NULL;
00134       char_type* __curo = NULL;
00135       char_type* __endi = NULL;
00136       char_type* __endo = NULL;
00137 
00138       if (__testin || __testboth)
00139         {
00140           __curi = this->gptr();
00141           __endi = this->egptr();
00142         }
00143       if (__testout || __testboth)
00144         {
00145           __curo = this->pptr();
00146           __endo = this->epptr();
00147         }
00148 
00149       off_type __newoffi = 0;
00150       off_type __newoffo = 0;
00151       if (__way == ios_base::cur)
00152         {
00153           __newoffi = __curi - __beg;
00154           __newoffo = __curo - __beg;
00155         }
00156       else if (__way == ios_base::end)
00157         {
00158           __newoffi = __endi - __beg;
00159           __newoffo = __endo - __beg;
00160         }
00161 
00162       if ((__testin || __testboth)
00163           && __newoffi + __off >= 0 && __endi - __beg >= __newoffi + __off)
00164         {
00165           _M_in_cur = __beg + __newoffi + __off;
00166           __ret = pos_type(__newoffi);
00167         }
00168       if ((__testout || __testboth)
00169           && __newoffo + __off >= 0 && __endo - __beg >= __newoffo + __off)
00170         {
00171           _M_out_cur_move(__newoffo + __off - (_M_out_cur - __beg));
00172           __ret = pos_type(__newoffo);
00173         }
00174     }
00175       return __ret;
00176     }
00177 
00178   template <class _CharT, class _Traits, class _Alloc>
00179     typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
00180     basic_stringbuf<_CharT, _Traits, _Alloc>::
00181     seekpos(pos_type __sp, ios_base::openmode __mode)
00182     {
00183       pos_type __ret =  pos_type(off_type(-1)); 
00184       
00185       if (_M_buf_size)
00186     {
00187       off_type __pos = __sp; // Use streamoff operator to do conversion.
00188       char_type* __beg = NULL;
00189       char_type* __end = NULL;
00190       bool __testin = (ios_base::in & _M_mode & __mode) != 0;
00191       bool __testout = (ios_base::out & _M_mode & __mode) != 0;
00192       bool __testboth = __testin && __testout;
00193       __testin &= !(__mode & ios_base::out);
00194       __testout &= !(__mode & ios_base::in);
00195       
00196       // NB: Ordered.
00197       bool __testposi = false;
00198       bool __testposo = false;
00199       if (__testin || __testboth)
00200         {
00201           __beg = this->eback();
00202           __end = this->egptr();
00203           if (0 <= __pos && __pos <= __end - __beg)
00204         __testposi = true;
00205         }
00206       if (__testout || __testboth)
00207         {
00208           __beg = this->pbase();
00209           __end = _M_buf + _M_buf_size;
00210           if (0 <= __pos && __pos <= __end - __beg)
00211         __testposo = true;
00212         }
00213       if (__testposi || __testposo)
00214         {
00215           if (__testposi)
00216         _M_in_cur = _M_in_beg + __pos;
00217           if (__testposo)
00218         _M_out_cur_move((__pos) - (_M_out_cur - __beg));
00219           __ret = pos_type(off_type(__pos));
00220         }
00221     }
00222       return __ret;
00223     }
00224 
00225   // Inhibit implicit instantiations for required instantiations,
00226   // which are defined via explicit instantiations elsewhere.  
00227   // NB:  This syntax is a GNU extension.
00228 #if _GLIBCXX_EXTERN_TEMPLATE
00229   extern template class basic_stringbuf<char>;
00230   extern template class basic_istringstream<char>;
00231   extern template class basic_ostringstream<char>;
00232   extern template class basic_stringstream<char>;
00233 
00234 #ifdef _GLIBCPP_USE_WCHAR_T
00235   extern template class basic_stringbuf<wchar_t>;
00236   extern template class basic_istringstream<wchar_t>;
00237   extern template class basic_ostringstream<wchar_t>;
00238   extern template class basic_stringstream<wchar_t>;
00239 #endif
00240 #endif
00241 } // namespace std
00242 
00243 #endif

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