5836a818ec
This reverts commitb558ff043d. This reverts commit4a11f20659. The initial import commit failed to retain local changes made to readline's configure.in (and the commit message erroneously stated that there were no local changes that needed to be reapplied). Also the import caused a couple of build errors and a scattering of testsuite regressions throughout many arches. It's probably better to start over with this import, hopefully more carefully next time.
139 lines
3.3 KiB
C++
139 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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