140 lines
3.3 KiB
C++
140 lines
3.3 KiB
C++
/*******************************************************************************
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* $Revision$
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* $Date$
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* $Author$
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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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