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