sstream.tcc

00001 // String based streams -*- C++ -*-
00002 
00003 // Copyright (C) 1997, 1998, 1999, 2001, 2002, 2003
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 _SSTREAM_TCC
00036 #define _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       const bool __testeof = traits_type::eq_int_type(__c, __ret);
00051 
00052       if (this->eback() < this->gptr())
00053     {
00054       const bool __testeq = traits_type::eq(traits_type::to_char_type(__c),
00055                         this->gptr()[-1]);
00056       this->gbump(-1);
00057 
00058       // Try to put back __c into input sequence in one of three ways.
00059       // Order these tests done in is unspecified by the standard.
00060       if (!__testeof && __testeq)
00061         __ret = __c;
00062       else if (__testeof)
00063         __ret = traits_type::not_eof(__c);
00064       else
00065         {
00066           *this->gptr() = traits_type::to_char_type(__c);
00067           __ret = __c;
00068         }
00069     }
00070       return __ret;
00071     }
00072 
00073   template <class _CharT, class _Traits, class _Alloc>
00074     typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
00075     basic_stringbuf<_CharT, _Traits, _Alloc>::
00076     overflow(int_type __c)
00077     {
00078       const bool __testout = this->_M_mode & ios_base::out;
00079       if (__builtin_expect(!__testout, false))
00080     return traits_type::eof();
00081 
00082       const bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
00083       if (__builtin_expect(__testeof, false))
00084     return traits_type::not_eof(__c);
00085 
00086       const __size_type __capacity = _M_string.capacity();
00087       const __size_type __max_size = _M_string.max_size();
00088       const bool __testput = this->pptr() < this->epptr();
00089       if (__builtin_expect(!__testput && __capacity == __max_size, false))
00090     return traits_type::eof();
00091 
00092       // Try to append __c into output sequence in one of two ways.
00093       // Order these tests done in is unspecified by the standard.
00094       if (!__testput)
00095     {
00096       // NB: Start ostringstream buffers at 512 chars. This is an
00097       // experimental value (pronounced "arbitrary" in some of the
00098       // hipper english-speaking countries), and can be changed to
00099       // suit particular needs.
00100       // Then, in virtue of DR 169 (TC) we are allowed to grow more
00101       // than one char.
00102       const __size_type __opt_len = std::max(__size_type(2 * __capacity),
00103                          __size_type(512));
00104       const __size_type __len = std::min(__opt_len, __max_size);
00105       __string_type __tmp;
00106       __tmp.reserve(__len);
00107       __tmp.assign(_M_string.data(), this->epptr() - this->pbase());
00108       _M_string.swap(__tmp);
00109       _M_sync(const_cast<char_type*>(_M_string.data()),
00110           this->gptr() - this->eback(), this->pptr() - this->pbase());
00111     }
00112       return this->sputc(traits_type::to_char_type(__c));
00113     }
00114 
00115   template <class _CharT, class _Traits, class _Alloc>
00116     typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
00117     basic_stringbuf<_CharT, _Traits, _Alloc>::
00118     underflow()
00119     {
00120       int_type __ret = traits_type::eof();
00121       const bool __testin = this->_M_mode & ios_base::in;
00122       if (__testin)
00123     {
00124       // Update egptr() to match the actual string end.
00125       _M_update_egptr();
00126 
00127       if (this->gptr() < this->egptr())
00128         __ret = traits_type::to_int_type(*this->gptr());
00129     }
00130       return __ret;
00131     }
00132 
00133   template <class _CharT, class _Traits, class _Alloc>
00134     typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
00135     basic_stringbuf<_CharT, _Traits, _Alloc>::
00136     seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
00137     {
00138       pos_type __ret =  pos_type(off_type(-1));
00139       bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
00140       bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
00141       const bool __testboth = __testin && __testout && __way != ios_base::cur;
00142       __testin &= !(__mode & ios_base::out);
00143       __testout &= !(__mode & ios_base::in);
00144 
00145       // _GLIBCXX_RESOLVE_LIB_DEFECTS
00146       // 453. basic_stringbuf::seekoff need not always fail for an empty stream.
00147       const char_type* __beg = __testin ? this->eback() : this->pbase();
00148       if ((__beg || !__off) && (__testin || __testout || __testboth))
00149     {
00150       _M_update_egptr();
00151 
00152       off_type __newoffi = 0;
00153       off_type __newoffo = 0;
00154       if (__way == ios_base::cur)
00155         {
00156           __newoffi = this->gptr() - __beg;
00157           __newoffo = this->pptr() - __beg;
00158         }
00159       else if (__way == ios_base::end)
00160         __newoffo = __newoffi = this->egptr() - __beg;
00161 
00162       if ((__testin || __testboth)
00163           && __newoffi + __off >= 0
00164           && this->egptr() - __beg >= __newoffi + __off)
00165         {
00166           this->gbump((__beg + __newoffi + __off) - this->gptr());
00167           __ret = pos_type(__newoffi);
00168         }
00169       if ((__testout || __testboth)
00170           && __newoffo + __off >= 0
00171           && this->egptr() - __beg >= __newoffo + __off)
00172         {
00173           this->pbump((__beg + __newoffo + __off) - this->pptr());
00174           __ret = pos_type(__newoffo);
00175         }
00176     }
00177       return __ret;
00178     }
00179 
00180   template <class _CharT, class _Traits, class _Alloc>
00181     typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
00182     basic_stringbuf<_CharT, _Traits, _Alloc>::
00183     seekpos(pos_type __sp, ios_base::openmode __mode)
00184     {
00185       pos_type __ret =  pos_type(off_type(-1));
00186       const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
00187       const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
00188 
00189       const char_type* __beg = __testin ? this->eback() : this->pbase();
00190       if (__beg)
00191     {
00192       _M_update_egptr();
00193 
00194       off_type __pos(__sp);
00195       const bool __testpos = 0 <= __pos
00196                              && __pos <=  this->egptr() - __beg;
00197       if ((__testin || __testout) && __testpos)
00198         {
00199           if (__testin)
00200         this->gbump((__beg + __pos) - this->gptr());
00201           if (__testout)
00202                 this->pbump((__beg + __pos) - this->pptr());
00203           __ret = __sp;
00204         }
00205     }
00206       return __ret;
00207     }
00208 
00209   // Inhibit implicit instantiations for required instantiations,
00210   // which are defined via explicit instantiations elsewhere.
00211   // NB:  This syntax is a GNU extension.
00212 #if _GLIBCXX_EXTERN_TEMPLATE
00213   extern template class basic_stringbuf<char>;
00214   extern template class basic_istringstream<char>;
00215   extern template class basic_ostringstream<char>;
00216   extern template class basic_stringstream<char>;
00217 
00218 #ifdef _GLIBCXX_USE_WCHAR_T
00219   extern template class basic_stringbuf<wchar_t>;
00220   extern template class basic_istringstream<wchar_t>;
00221   extern template class basic_ostringstream<wchar_t>;
00222   extern template class basic_stringstream<wchar_t>;
00223 #endif
00224 #endif
00225 } // namespace std
00226 
00227 #endif

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