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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [readline/] [examples/] [readlinebuf.h] - Blame information for rev 868

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1 24 jeremybenn 
/*******************************************************************************
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 * $Revision: 1.2 $
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 * $Date: 2001/09/11 06:19:36 $
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 * $Author: vyzo $
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 *
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 * Contents: A streambuf which uses the GNU readline library for line I/O
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 * (c) 2001 by Dimitris Vyzovitis [vyzo@media.mit.edu]
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public
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 * License along with this program; if not, write to the Free
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 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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 * MA 02111-1307 USA
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 *
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 ******************************************************************************/
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#ifndef _READLINEBUF_H_
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#define _READLINEBUF_H_
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#include <iostream>
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#include <cstring>
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#include <cassert>
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#include <cstdlib>
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#include <cstdio>
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#include <readline/readline.h>
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#include <readline/history.h>
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#if (defined __GNUC__) && (__GNUC__ < 3)
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#include <streambuf.h>
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#else
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#include <streambuf>
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using std::streamsize;
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using std::streambuf;
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#endif
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class readlinebuf : public streambuf {
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public:
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#if (defined __GNUC__) && (__GNUC__ < 3)
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        typedef char char_type;
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        typedef int int_type;
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        typedef streampos pos_type;
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        typedef streamoff off_type;
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#endif
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        static const int_type eof = EOF; // this is -1
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        static const int_type not_eof = 0;
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private:
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        const char* prompt_;
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        bool history_;
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        char* line_;
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        int low_;
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        int high_;
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protected:
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        virtual int_type showmanyc() const { return high_ - low_; }
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        virtual streamsize xsgetn( char_type* buf, streamsize n ) {
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                int rd = n > (high_ - low_)? (high_ - low_) : n;
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                memcpy( buf, line_, rd );
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                low_ += rd;
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                if ( rd < n ) {
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                        low_ = high_ = 0;
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                        free( line_ ); // free( NULL ) is a noop
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                        line_ = readline( prompt_ );
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                        if ( line_ ) {
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                                high_ = strlen( line_ );
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                                if ( history_ && high_ ) add_history( line_ );
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                                rd += xsgetn( buf + rd, n - rd );
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                        }
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                }
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                return rd;
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        }
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        virtual int_type underflow() {
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                if ( high_ == low_ ) {
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                        low_ = high_ = 0;
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                        free( line_ ); // free( NULL ) is a noop
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                        line_ = readline( prompt_ );
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                        if ( line_ ) {
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                                high_ = strlen( line_ );
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                                if ( history_ && high_ ) add_history( line_ );
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                        }
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                }
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                if ( low_ < high_ ) return line_[low_];
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                else return eof;
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        }
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        virtual int_type uflow() {
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                int_type c = underflow();
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                if ( c != eof ) ++low_;
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                return c;
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        }
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        virtual int_type pbackfail( int_type c = eof ) {
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                if ( low_ > 0 )  --low_;
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                else if ( c != eof ) {
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                        if ( high_ > 0 ) {
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                                char* nl = (char*)realloc( line_, high_ + 1 );
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                                if ( nl ) {
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                                        line_ = (char*)memcpy( nl + 1, line_, high_ );
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                                        high_ += 1;
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                                        line_[0] = char( c );
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                                } else return eof;
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                        } else {
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                                assert( !line_ );
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                                line_ = (char*)malloc( sizeof( char ) );
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                                *line_ = char( c );
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                                high_ = 1;
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                        }
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                } else return eof;
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                return not_eof;
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        }
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public:
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        readlinebuf( const char* prompt = NULL, bool history = true )
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                : prompt_( prompt ), history_( history ),
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                  line_( NULL ), low_( 0 ), high_( 0 ) {
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                setbuf( 0, 0 );
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        }
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};
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#endif

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