strstream

00001 // Backward-compat support -*- C++ -*-
00002 
00003 // Copyright (C) 2001 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 /*
00031  * Copyright (c) 1998
00032  * Silicon Graphics Computer Systems, Inc.
00033  *
00034  * Permission to use, copy, modify, distribute and sell this software
00035  * and its documentation for any purpose is hereby granted without fee,
00036  * provided that the above copyright notice appear in all copies and
00037  * that both that copyright notice and this permission notice appear
00038  * in supporting documentation.  Silicon Graphics makes no
00039  * representations about the suitability of this software for any
00040  * purpose.  It is provided "as is" without express or implied warranty.
00041  */
00042 
00043 // WARNING: The classes defined in this header are DEPRECATED.  This
00044 // header is defined in section D.7.1 of the C++ standard, and it
00045 // MAY BE REMOVED in a future standard revision.  You should use the
00046 // header <sstream> instead.
00047 
00048 #ifndef __SGI_STL_STRSTREAM
00049 #define __SGI_STL_STRSTREAM
00050 
00051 #include "backward_warning.h"
00052 #include <iosfwd>
00053 #include <ios>
00054 #include <istream>
00055 #include <ostream>
00056 #include <string>
00057 
00058 namespace std
00059 {
00060 
00061 //----------------------------------------------------------------------
00062 // Class strstreambuf, a streambuf class that manages an array of char.
00063 // Note that this class is not a template.
00064 
00065 class strstreambuf : public basic_streambuf<char, char_traits<char> >
00066 {
00067 public:                         // Types.
00068   typedef char_traits<char>              _Traits;
00069   typedef basic_streambuf<char, _Traits> _Base;
00070 
00071 public:                         // Constructor, destructor
00072   explicit strstreambuf(streamsize __initial_capacity = 0);
00073   strstreambuf(void* (*__alloc)(size_t), void (*__free)(void*));
00074 
00075   strstreambuf(char* __get, streamsize __n, char* __put = 0);
00076   strstreambuf(signed char* __get, streamsize __n, signed char* __put = 0);
00077   strstreambuf(unsigned char* __get, streamsize __n, unsigned char* __put=0);
00078 
00079   strstreambuf(const char* __get, streamsize __n);
00080   strstreambuf(const signed char* __get, streamsize __n);
00081   strstreambuf(const unsigned char* __get, streamsize __n);
00082 
00083   virtual ~strstreambuf();
00084 
00085 public:                         // strstreambuf operations.
00086   void freeze(bool = true);
00087   char* str();
00088   int pcount() const;
00089 
00090 protected:                      // Overridden virtual member functions.
00091   virtual int_type overflow(int_type __c  = _Traits::eof());
00092   virtual int_type pbackfail(int_type __c = _Traits::eof());
00093   virtual int_type underflow();
00094   virtual _Base* setbuf(char* __buf, streamsize __n);
00095   virtual pos_type seekoff(off_type __off, ios_base::seekdir __dir,
00096                            ios_base::openmode __mode
00097                                       = ios_base::in | ios_base::out);
00098   virtual pos_type seekpos(pos_type __pos, ios_base::openmode __mode
00099                                       = ios_base::in | ios_base::out);
00100 
00101 private:                        // Helper functions.
00102   // Dynamic allocation, possibly using _M_alloc_fun and _M_free_fun.
00103   char* _M_alloc(size_t);
00104   void  _M_free(char*);
00105 
00106   // Helper function used in constructors.
00107   void _M_setup(char* __get, char* __put, streamsize __n);
00108 
00109 private:                        // Data members.
00110   void* (*_M_alloc_fun)(size_t);
00111   void  (*_M_free_fun)(void*);
00112 
00113   bool _M_dynamic  : 1;
00114   bool _M_frozen   : 1;
00115   bool _M_constant : 1;
00116 };
00117 
00118 //----------------------------------------------------------------------
00119 // Class istrstream, an istream that manages a strstreambuf.
00120 
00121 class istrstream : public basic_istream<char>
00122 {
00123 public:
00124   explicit istrstream(char*);
00125   explicit istrstream(const char*);
00126   istrstream(char* , streamsize);
00127   istrstream(const char*, streamsize);
00128   virtual ~istrstream();
00129 
00130   strstreambuf* rdbuf() const;
00131   char* str();
00132 
00133 private:
00134   strstreambuf _M_buf;
00135 };
00136 
00137 //----------------------------------------------------------------------
00138 // Class ostrstream
00139 
00140 class ostrstream : public basic_ostream<char>
00141 {
00142 public:
00143   ostrstream();
00144   ostrstream(char*, int, ios_base::openmode = ios_base::out);
00145   virtual ~ostrstream();
00146 
00147   strstreambuf* rdbuf() const;
00148   void freeze(bool = true);
00149   char* str();
00150   int pcount() const;
00151 
00152 private:
00153   strstreambuf _M_buf;
00154 };
00155 
00156 //----------------------------------------------------------------------
00157 // Class strstream
00158 
00159 class strstream : public basic_iostream<char>
00160 {
00161 public:
00162   typedef char                        char_type;
00163   typedef char_traits<char>::int_type int_type;
00164   typedef char_traits<char>::pos_type pos_type;
00165   typedef char_traits<char>::off_type off_type;
00166 
00167   strstream();
00168   strstream(char*, int, ios_base::openmode = ios_base::in | ios_base::out);
00169   virtual ~strstream();
00170 
00171   strstreambuf* rdbuf() const;
00172   void freeze(bool = true);
00173   int pcount() const;
00174   char* str();
00175 
00176 private:
00177   strstreambuf _M_buf;
00178 };
00179 
00180 } // namespace std
00181 
00182 #endif /* __SGI_STL_STRSTREAM */
00183 
00184 // Local Variables:
00185 // mode:C++
00186 // End:
00187 
00188 

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