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[/] [openrisc/] [tags/] [gnu-src/] [gdb-6.8/] [pre-binutils-2.20.1-sync/] [readline/] [examples/] [readlinebuf.h] - Rev 223
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/******************************************************************************* * $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