/* This is part of libio/iostream, providing -*- C++ -*- input/output.Copyright (C) 2000 Free Software FoundationThis file is part of the GNU IO Library. This library is freesoftware; you can redistribute it and/or modify it under theterms of the GNU General Public License as published by theFree 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 ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See theGNU General Public License for more details.You should have received a copy of the GNU General Public Licensealong with this library; see the file COPYING. If not, write to the FreeSoftware Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.As a special exception, if you link this library with filescompiled with a GNU compiler to produce an executable, this does not causethe resulting executable to be covered by the GNU General Public License.This exception does not however invalidate any other reasons whythe executable file might be covered by the GNU General Public License. *//* Written by Magnus Fromreide (magfr@lysator.liu.se). *//* seekoff and ideas for overflow is largely borrowed from libstdc++-v3 */#ifndef __SSTREAM__#define __SSTREAM__#include <iostream.h>#include <streambuf.h>#include <string>namespace std{class stringbuf : public streambuf{public:typedef char char_type;typedef int int_type;typedef streampos pos_type;typedef streamoff off_type;explicitstringbuf(int which=ios::in|ios::out): streambuf(), mode(static_cast<ios::open_mode>(which)),stream(NULL), stream_len(0){stringbuf_init();}explicitstringbuf(const string &str, int which=ios::in|ios::out): streambuf(), mode(static_cast<ios::open_mode>(which)),stream(NULL), stream_len(0){if (mode & (ios::in|ios::out)){stream_len = str.size();stream = new char_type[stream_len];str.copy(stream, stream_len);}stringbuf_init();}virtual~stringbuf(){delete[] stream;}stringstr() const{if (pbase() != 0)return string(stream, pptr()-pbase());elsereturn string();}voidstr(const string& str){delete[] stream;stream_len = str.size();stream = new char_type[stream_len];str.copy(stream, stream_len);stringbuf_init();}protected:// The buffer is already in gptr, so if it ends then it is out of data.virtual intunderflow(){return EOF;}virtual intoverflow(int c = EOF){int res;if (mode & ios::out){if (c != EOF){streamsize old_stream_len = stream_len;stream_len += 1;char_type* new_stream = new char_type[stream_len];memcpy(new_stream, stream, old_stream_len);delete[] stream;stream = new_stream;stringbuf_sync(gptr()-eback(), pptr()-pbase());sputc(c);res = c;}elseres = EOF;}elseres = 0;return res;}virtual streambuf*setbuf(char_type* s, streamsize n){if (n != 0){delete[] stream;stream = new char_type[n];memcpy(stream, s, n);stream_len = n;stringbuf_sync(0, 0);}return this;}virtual pos_typeseekoff(off_type off, ios::seek_dir way, int which = ios::in | ios::out){pos_type ret = pos_type(off_type(-1));bool testin = which & ios::in && mode & ios::in;bool testout = which & ios::out && mode & ios::out;bool testboth = testin && testout && way != ios::cur;if (stream_len && ((testin != testout) || testboth)){char_type* beg = stream;char_type* curi = NULL;char_type* curo = NULL;char_type* endi = NULL;char_type* endo = NULL;if (testin){curi = gptr();endi = egptr();}if (testout){curo = pptr();endo = epptr();}off_type newoffi = 0;off_type newoffo = 0;if (way == ios::beg){newoffi = beg - curi;newoffo = beg - curo;}else if (way == ios::end){newoffi = endi - curi;newoffo = endo - curo;}if (testin && newoffi + off + curi - beg >= 0 &&endi - beg >= newoffi + off + curi - beg){gbump(newoffi + off);ret = pos_type(newoffi + off + curi);}if (testout && newoffo + off + curo - beg >= 0 &&endo - beg >= newoffo + off + curo - beg){pbump(newoffo + off);ret = pos_type(newoffo + off + curo);}}return ret;}virtual pos_typeseekpos(pos_type sp, int which = ios::in | ios::out){pos_type ret = seekoff(sp, ios::beg, which);return ret;}private:voidstringbuf_sync(streamsize i, streamsize o){if (mode & ios::in)setg(stream, stream + i, stream + stream_len);if (mode & ios::out){setp(stream, stream + stream_len);pbump(o);}}voidstringbuf_init(){if (mode & ios::ate)stringbuf_sync(0, stream_len);elsestringbuf_sync(0, 0);}private:ios::open_mode mode;char_type* stream;streamsize stream_len;};class istringstream : public istream {public:typedef char char_type;typedef int int_type;typedef streampos pos_type;typedef streamoff off_type;explicitistringstream(int which=ios::in): istream(&sb), sb(which | ios::in){ }explicitistringstream(const string& str, int which=ios::in): istream(&sb), sb(str, which | ios::in){ }stringbuf*rdbuf() const{return const_cast<stringbuf*>(&sb);}stringstr() const{return rdbuf()->str();}voidstr(const string& s){rdbuf()->str(s);}private:stringbuf sb;};class ostringstream : public ostream {public:typedef char char_type;typedef int int_type;typedef streampos pos_type;typedef streamoff off_type;explicitostringstream(int which=ios::out): ostream(&sb), sb(which | ios::out){ }explicitostringstream(const string& str, int which=ios::out): ostream(&sb), sb(str, which | ios::out){ }stringbuf*rdbuf() const{return const_cast<stringbuf*>(&sb);}stringstr() const{return rdbuf()->str();}void str(const string& s){rdbuf()->str(s);}private:stringbuf sb;};class stringstream : public iostream {public:typedef char char_type;typedef int int_type;typedef streampos pos_type;typedef streamoff off_type;explicitstringstream(int which=ios::out|ios::in): iostream(&sb), sb(which){ }explicitstringstream(const string& str, int which=ios::out|ios::in): iostream(&sb), sb(str, which){ }stringbuf*rdbuf() const{return const_cast<stringbuf*>(&sb);}stringstr() const{return rdbuf()->str();}voidstr(const string& s){rdbuf()->str(s);}private:stringbuf sb;};};#endif /* not __STRSTREAM__ */