binutils-gdb/readline/examples/readlinebuf.h

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2002-12-09 06:31:39 +08:00
/*******************************************************************************
* $Revision$
* $Date$
* $Author$
*
* 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
Imported readline 6.2, and upstream patch 001. [patch 0/3] readline-6.2 rebase http://sourceware.org/ml/gdb-patches/2011-05/msg00003.html [patch 1/3] readline-6.2: Merge of already posted patches http://sourceware.org/ml/gdb-patches/2011-05/msg00004.html = [Bug-readline] [RFC/readline] bind.c, rl_function_dumper, Free allocated http://lists.gnu.org/archive/html/bug-readline/2011-03/msg00000.html [Bug-readline] [patch] Fix underquotation in readline/examples/rlfe/conf http://lists.gnu.org/archive/html/bug-readline/2011-04/msg00001.html [Bug-readline] [patch] Makefile.in htm<->html http://lists.gnu.org/archive/html/bug-readline/2011-04/msg00002.html Re: [Bug-readline] [patch] Makefile.in dependency: callback.o: xmalloc.h http://lists.gnu.org/archive/html/bug-readline/2011-04/msg00004.html [Bug-readline] [patch] Remove . from the VPATH directive http://lists.gnu.org/archive/html/bug-readline/2011-04/msg00005.html Eli Zaretskii's __MSDOS__ / __GO32__ / __MINGW32__ / __DJGPP__ stuff: http://sourceware.org/ml/gdb/2011-04/msg00002.html Jan Kratochvil's patch for FSF GDB tree local-specific changes: http://sourceware.org/ml/gdb/2011-04/msg00006.html Preservation of existing ChangeLog.gdb files, their updates. [patch 2/3] readline-6.2: Workaround "ask" regression http://sourceware.org/ml/gdb-patches/2011-05/msg00005.html [patch 3/3] readline-6.2: Revert 5.x compat., apply 6.x compat. http://sourceware.org/ml/gdb-patches/2011-05/msg00006.html [patch 4/3] readline-6.2: Substitute inc-hist.texinfo http://sourceware.org/ml/gdb-patches/2011-05/msg00010.html readline/ Workaround gdb.base/completion.exp regression on readline-6.2. * complete.c (get_y_or_n): Disable the return on RL_STATE_CALLBACK. Imported readline 6.2, and upstream patch 001. * configure: Regenerate. readline/doc/ * hsuser.texi (Using History Interactively): Disable !BashFeatures @defcodeindex. Make the `Programming with GNU History' reference external. * inc-hist.texinfo: Remove. Imported readline 6.2, and upstream patch 001. readline/examples/ Imported readline 6.2, and upstream patch 001. readline/examples/rlfe/ Imported readline 6.2, and upstream patch 001. gdb/ * config.in: Regenerate. * configure: Regenerate. * configure.ac <--with-system-readline> (for readline_echoing_p): Remove the test. * tui/tui-io.c (tui_old_readline_echoing_p): Rename to ... (tui_old_rl_echoing_p): ... here. (tui_setup_io): Rename extern declaration readline_echoing_p to _rl_echoing_p. Adjust assignments for the both renames. gdb/doc/ * Makefile.in (GDB_DOC_SOURCE_INCLUDES): Rename inc-hist.texinfo to hsuser.texi. * gdb.texinfo <!SYSTEM_READLINE>: Rename inc-hist.texinfo inclusion and comment to hsuser.texi. Change rluser.texi name in the comment.
2011-05-12 07:38:44 +08:00
* the Free Software Foundation; either version 2 of the License, or
2002-12-09 06:31:39 +08:00
* (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