readline/readline/callback.c - binutils-gdb - Git at Google

 /* callback.c -- functions to use readline as an X `callback' mechanism. */

 /* Copyright (C) 1987-2017 Free Software Foundation, Inc.

    This file is part of the GNU Readline Library (Readline), a library
    for reading lines of text with interactive input and history editing.

    Readline 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 3 of the License, or
    (at your option) any later version.

    Readline 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 Readline.  If not, see <http://www.gnu.org/licenses/>.
 */

 #define READLINE_LIBRARY

 #if defined (HAVE_CONFIG_H)
 #  include <config.h>
 #endif

 #include "rlconf.h"

 #if defined (READLINE_CALLBACKS)

 #include <sys/types.h>

 #ifdef HAVE_STDLIB_H
 #  include <stdlib.h>
 #else
 #  include "ansi_stdlib.h"
 #endif

 #include <stdio.h>

 /* System-specific feature definitions and include files. */
 #include "rldefs.h"
 #include "readline.h"
 #include "rlprivate.h"
 #include "xmalloc.h"

 /* Private data for callback registration functions.  See comments in
    rl_callback_read_char for more details. */
 _rl_callback_func_t *_rl_callback_func = 0;
 _rl_callback_generic_arg *_rl_callback_data = 0;

 /* Applications can set this to non-zero to have readline's signal handlers
    installed during the entire duration of reading a complete line, as in
    readline-6.2.  This should be used with care, because it can result in
    readline receiving signals and not handling them until it's called again
    via rl_callback_read_char, thereby stealing them from the application.
    By default, signal handlers are only active while readline is active. */
 int rl_persistent_signal_handlers = 0;

 /* **************************************************************** */
 /*								    */
 /*			Callback Readline Functions		    */
 /*								    */
 /* **************************************************************** */

 /* Allow using readline in situations where a program may have multiple
    things to handle at once, and dispatches them via select().  Call
    rl_callback_handler_install() with the prompt and a function to call
    whenever a complete line of input is ready.  The user must then
    call rl_callback_read_char() every time some input is available, and
    rl_callback_read_char() will call the user's function with the complete
    text read in at each end of line.  The terminal is kept prepped
    all the time, except during calls to the user's function.  Signal
    handlers are only installed when the application calls back into
    readline, so readline doesn't `steal' signals from the application.  */

 rl_vcpfunc_t *rl_linefunc;		/* user callback function */
 static int in_handler;		/* terminal_prepped and signals set? */

 /* Make sure the terminal is set up, initialize readline, and prompt. */
 static void
 _rl_callback_newline (void)
 {
   rl_initialize ();

   if (in_handler == 0)
     {
       in_handler = 1;

       if (rl_prep_term_function)
 	(*rl_prep_term_function) (_rl_meta_flag);

 #if defined (HANDLE_SIGNALS)
       if (rl_persistent_signal_handlers)
 	rl_set_signals ();
 #endif
     }

   readline_internal_setup ();
   RL_CHECK_SIGNALS ();
 }

 /* Install a readline handler, set up the terminal, and issue the prompt. */
 void
 rl_callback_handler_install (const char *prompt, rl_vcpfunc_t *linefunc)
 {
   rl_set_prompt (prompt);
   RL_SETSTATE (RL_STATE_CALLBACK);
   rl_linefunc = linefunc;
   _rl_callback_newline ();
 }

 #if defined (HANDLE_SIGNALS)
 #define CALLBACK_READ_RETURN() \
   do { \
     if (rl_persistent_signal_handlers == 0) \
       rl_clear_signals (); \
     return; \
   } while (0)
 #else
 #define CALLBACK_READ_RETURN() return
 #endif

 /* Read one character, and dispatch to the handler if it ends the line. */
 void
 rl_callback_read_char (void)
 {
   char *line;
   int eof, jcode;
   static procenv_t olevel;

   if (rl_linefunc == NULL)
     {
       _rl_errmsg ("readline_callback_read_char() called with no handler!");
       abort ();
     }

   memcpy ((void *)olevel, (void *)_rl_top_level, sizeof (procenv_t));
 #if defined (HAVE_POSIX_SIGSETJMP)
   jcode = sigsetjmp (_rl_top_level, 0);
 #else
   jcode = setjmp (_rl_top_level);
 #endif
   if (jcode)
     {
       (*rl_redisplay_function) ();
       _rl_want_redisplay = 0;
       memcpy ((void *)_rl_top_level, (void *)olevel, sizeof (procenv_t));
       CALLBACK_READ_RETURN ();
     }

 #if defined (HANDLE_SIGNALS)
   /* Install signal handlers only when readline has control. */
   if (rl_persistent_signal_handlers == 0)
     rl_set_signals ();
 #endif

   do
     {
       RL_CHECK_SIGNALS ();
       if  (RL_ISSTATE (RL_STATE_ISEARCH))
 	{
 	  eof = _rl_isearch_callback (_rl_iscxt);
 	  if (eof == 0 && (RL_ISSTATE (RL_STATE_ISEARCH) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING))
 	    rl_callback_read_char ();

 	  CALLBACK_READ_RETURN ();
 	}
       else if  (RL_ISSTATE (RL_STATE_NSEARCH))
 	{
 	  eof = _rl_nsearch_callback (_rl_nscxt);

 	  CALLBACK_READ_RETURN ();
 	}
 #if defined (VI_MODE)
       /* States that can occur while in state VIMOTION have to be checked
 	 before RL_STATE_VIMOTION */
       else if (RL_ISSTATE (RL_STATE_CHARSEARCH))
 	{
 	  int k;

 	  k = _rl_callback_data->i2;

 	  eof = (*_rl_callback_func) (_rl_callback_data);
 	  /* If the function `deregisters' itself, make sure the data is
 	     cleaned up. */
 	  if (_rl_callback_func == 0)	/* XXX - just sanity check */
 	    {
 	      if (_rl_callback_data)
 		{
 		  _rl_callback_data_dispose (_rl_callback_data);
 		  _rl_callback_data = 0;
 		}
 	    }

 	  /* Messy case where vi motion command can be char search */
 	  if (RL_ISSTATE (RL_STATE_VIMOTION))
 	    {
 	      _rl_vi_domove_motion_cleanup (k, _rl_vimvcxt);
 	      _rl_internal_char_cleanup ();
 	      CALLBACK_READ_RETURN ();
 	    }

 	  _rl_internal_char_cleanup ();
 	}
       else if (RL_ISSTATE (RL_STATE_VIMOTION))
 	{
 	  eof = _rl_vi_domove_callback (_rl_vimvcxt);
 	  /* Should handle everything, including cleanup, numeric arguments,
 	     and turning off RL_STATE_VIMOTION */
 	  if (RL_ISSTATE (RL_STATE_NUMERICARG) == 0)
 	    _rl_internal_char_cleanup ();

 	  CALLBACK_READ_RETURN ();
 	}
 #endif
       else if (RL_ISSTATE (RL_STATE_NUMERICARG))
 	{
 	  eof = _rl_arg_callback (_rl_argcxt);
 	  if (eof == 0 && (RL_ISSTATE (RL_STATE_NUMERICARG) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING))
 	    rl_callback_read_char ();
 	  /* XXX - this should handle _rl_last_command_was_kill better */
 	  else if (RL_ISSTATE (RL_STATE_NUMERICARG) == 0)
 	    _rl_internal_char_cleanup ();

 	  CALLBACK_READ_RETURN ();
 	}
       else if (RL_ISSTATE (RL_STATE_MULTIKEY))
 	{
 	  eof = _rl_dispatch_callback (_rl_kscxt);	/* For now */
 	  while ((eof == -1 || eof == -2) && RL_ISSTATE (RL_STATE_MULTIKEY) && _rl_kscxt && (_rl_kscxt->flags & KSEQ_DISPATCHED))
 	    eof = _rl_dispatch_callback (_rl_kscxt);
 	  if (RL_ISSTATE (RL_STATE_MULTIKEY) == 0)
 	    {
 	      _rl_internal_char_cleanup ();
 	      _rl_want_redisplay = 1;
 	    }
 	}
       else if (_rl_callback_func)
 	{
 	  /* This allows functions that simply need to read an additional
 	     character (like quoted-insert) to register a function to be
 	     called when input is available.  _rl_callback_data is a
 	     pointer to a struct that has the argument count originally
 	     passed to the registering function and space for any additional
 	     parameters.  */
 	  eof = (*_rl_callback_func) (_rl_callback_data);
 	  /* If the function `deregisters' itself, make sure the data is
 	     cleaned up. */
 	  if (_rl_callback_func == 0)
 	    {
 	      if (_rl_callback_data)
 		{
 		  _rl_callback_data_dispose (_rl_callback_data);
 		  _rl_callback_data = 0;
 		}
 	      _rl_internal_char_cleanup ();
 	    }
 	}
       else
 	eof = readline_internal_char ();

       RL_CHECK_SIGNALS ();
       if (rl_done == 0 && _rl_want_redisplay)
 	{
 	  (*rl_redisplay_function) ();
 	  _rl_want_redisplay = 0;
 	}

       if (rl_done)
 	{
 	  line = readline_internal_teardown (eof);

 	  if (rl_deprep_term_function)
 	    (*rl_deprep_term_function) ();
 #if defined (HANDLE_SIGNALS)
 	  rl_clear_signals ();
 #endif
 	  in_handler = 0;
 	  (*rl_linefunc) (line);

 	  /* If the user did not clear out the line, do it for him. */
 	  if (rl_line_buffer[0])
 	    _rl_init_line_state ();

 	  /* Redisplay the prompt if readline_handler_{install,remove}
 	     not called. */
 	  if (in_handler == 0 && rl_linefunc)
 	    _rl_callback_newline ();
 	}
     }
   while (rl_pending_input || _rl_pushed_input_available () || RL_ISSTATE (RL_STATE_MACROINPUT));

   CALLBACK_READ_RETURN ();
 }

 /* Remove the handler, and make sure the terminal is in its normal state. */
 void
 rl_callback_handler_remove (void)
 {
   rl_linefunc = NULL;
   RL_UNSETSTATE (RL_STATE_CALLBACK);
   RL_CHECK_SIGNALS ();
   if (in_handler)
     {
       in_handler = 0;
       if (rl_deprep_term_function)
 	(*rl_deprep_term_function) ();
 #if defined (HANDLE_SIGNALS)
       rl_clear_signals ();
 #endif
     }
 }

 _rl_callback_generic_arg *
 _rl_callback_data_alloc (int count)
 {
   _rl_callback_generic_arg *arg;

   arg = (_rl_callback_generic_arg *)xmalloc (sizeof (_rl_callback_generic_arg));
   arg->count = count;

   arg->i1 = arg->i2 = 0;

   return arg;
 }

 void
 _rl_callback_data_dispose (_rl_callback_generic_arg *arg)
 {
   xfree (arg);
 }

 /* Make sure that this agrees with cases in rl_callback_read_char */
 void
 rl_callback_sigcleanup (void)
 {
   if (RL_ISSTATE (RL_STATE_CALLBACK) == 0)
     return;

   if (RL_ISSTATE (RL_STATE_ISEARCH))
     _rl_isearch_cleanup (_rl_iscxt, 0);
   else if (RL_ISSTATE (RL_STATE_NSEARCH))
     _rl_nsearch_cleanup (_rl_nscxt, 0);
   else if (RL_ISSTATE (RL_STATE_VIMOTION))
     RL_UNSETSTATE (RL_STATE_VIMOTION);
   else if (RL_ISSTATE (RL_STATE_NUMERICARG))
     {
       _rl_argcxt = 0;
       RL_UNSETSTATE (RL_STATE_NUMERICARG);
     }
   else if (RL_ISSTATE (RL_STATE_MULTIKEY))
     RL_UNSETSTATE (RL_STATE_MULTIKEY);
   if (RL_ISSTATE (RL_STATE_CHARSEARCH))
     RL_UNSETSTATE (RL_STATE_CHARSEARCH);

   _rl_callback_func = 0;
 }
 #endif
	/* callback.c -- functions to use readline as an X `callback' mechanism. */

	/* Copyright (C) 1987-2017 Free Software Foundation, Inc.

	This file is part of the GNU Readline Library (Readline), a library
	for reading lines of text with interactive input and history editing.

	Readline 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 3 of the License, or
	(at your option) any later version.

	Readline 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 Readline. If not, see <http://www.gnu.org/licenses/>.
	*/

	#define READLINE_LIBRARY

	#if defined (HAVE_CONFIG_H)
	# include <config.h>
	#endif

	#include "rlconf.h"

	#if defined (READLINE_CALLBACKS)

	#include <sys/types.h>

	#ifdef HAVE_STDLIB_H
	# include <stdlib.h>
	#else
	# include "ansi_stdlib.h"
	#endif

	#include <stdio.h>

	/* System-specific feature definitions and include files. */
	#include "rldefs.h"
	#include "readline.h"
	#include "rlprivate.h"
	#include "xmalloc.h"

	/* Private data for callback registration functions. See comments in
	rl_callback_read_char for more details. */
	_rl_callback_func_t *_rl_callback_func = 0;
	_rl_callback_generic_arg *_rl_callback_data = 0;

	/* Applications can set this to non-zero to have readline's signal handlers
	installed during the entire duration of reading a complete line, as in
	readline-6.2. This should be used with care, because it can result in
	readline receiving signals and not handling them until it's called again
	via rl_callback_read_char, thereby stealing them from the application.
	By default, signal handlers are only active while readline is active. */
	int rl_persistent_signal_handlers = 0;

	/* **************************************************************** */
	/* */
	/* Callback Readline Functions */
	/* */
	/* **************************************************************** */

	/* Allow using readline in situations where a program may have multiple
	things to handle at once, and dispatches them via select(). Call
	rl_callback_handler_install() with the prompt and a function to call
	whenever a complete line of input is ready. The user must then
	call rl_callback_read_char() every time some input is available, and
	rl_callback_read_char() will call the user's function with the complete
	text read in at each end of line. The terminal is kept prepped
	all the time, except during calls to the user's function. Signal
	handlers are only installed when the application calls back into
	readline, so readline doesn't `steal' signals from the application. */

	rl_vcpfunc_t rl_linefunc; / user callback function */
	static int in_handler; /* terminal_prepped and signals set? */

	/* Make sure the terminal is set up, initialize readline, and prompt. */
	static void
	_rl_callback_newline (void)
	{
	rl_initialize ();

	if (in_handler == 0)
	{
	in_handler = 1;

	if (rl_prep_term_function)
	(*rl_prep_term_function) (_rl_meta_flag);

	#if defined (HANDLE_SIGNALS)
	if (rl_persistent_signal_handlers)
	rl_set_signals ();
	#endif
	}

	readline_internal_setup ();
	RL_CHECK_SIGNALS ();
	}

	/* Install a readline handler, set up the terminal, and issue the prompt. */
	void
	rl_callback_handler_install (const char prompt, rl_vcpfunc_t linefunc)
	{
	rl_set_prompt (prompt);
	RL_SETSTATE (RL_STATE_CALLBACK);
	rl_linefunc = linefunc;
	_rl_callback_newline ();
	}

	#if defined (HANDLE_SIGNALS)
	#define CALLBACK_READ_RETURN() \
	do { \
	if (rl_persistent_signal_handlers == 0) \
	rl_clear_signals (); \
	return; \
	} while (0)
	#else
	#define CALLBACK_READ_RETURN() return
	#endif

	/* Read one character, and dispatch to the handler if it ends the line. */
	void
	rl_callback_read_char (void)
	{
	char *line;
	int eof, jcode;
	static procenv_t olevel;

	if (rl_linefunc == NULL)
	{
	_rl_errmsg ("readline_callback_read_char() called with no handler!");
	abort ();
	}

	memcpy ((void )olevel, (void )_rl_top_level, sizeof (procenv_t));
	#if defined (HAVE_POSIX_SIGSETJMP)
	jcode = sigsetjmp (_rl_top_level, 0);
	#else
	jcode = setjmp (_rl_top_level);
	#endif
	if (jcode)
	{
	(*rl_redisplay_function) ();
	_rl_want_redisplay = 0;
	memcpy ((void )_rl_top_level, (void )olevel, sizeof (procenv_t));
	CALLBACK_READ_RETURN ();
	}

	#if defined (HANDLE_SIGNALS)
	/* Install signal handlers only when readline has control. */
	if (rl_persistent_signal_handlers == 0)
	rl_set_signals ();
	#endif

	do
	{
	RL_CHECK_SIGNALS ();
	if (RL_ISSTATE (RL_STATE_ISEARCH))
	{
	eof = _rl_isearch_callback (_rl_iscxt);
	if (eof == 0 && (RL_ISSTATE (RL_STATE_ISEARCH) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING))
	rl_callback_read_char ();

	CALLBACK_READ_RETURN ();
	}
	else if (RL_ISSTATE (RL_STATE_NSEARCH))
	{
	eof = _rl_nsearch_callback (_rl_nscxt);

	CALLBACK_READ_RETURN ();
	}
	#if defined (VI_MODE)
	/* States that can occur while in state VIMOTION have to be checked
	before RL_STATE_VIMOTION */
	else if (RL_ISSTATE (RL_STATE_CHARSEARCH))
	{
	int k;

	k = _rl_callback_data->i2;

	eof = (*_rl_callback_func) (_rl_callback_data);
	/* If the function `deregisters' itself, make sure the data is
	cleaned up. */
	if (_rl_callback_func == 0) /* XXX - just sanity check */
	{
	if (_rl_callback_data)
	{
	_rl_callback_data_dispose (_rl_callback_data);
	_rl_callback_data = 0;
	}
	}

	/* Messy case where vi motion command can be char search */
	if (RL_ISSTATE (RL_STATE_VIMOTION))
	{
	_rl_vi_domove_motion_cleanup (k, _rl_vimvcxt);
	_rl_internal_char_cleanup ();
	CALLBACK_READ_RETURN ();
	}

	_rl_internal_char_cleanup ();
	}
	else if (RL_ISSTATE (RL_STATE_VIMOTION))
	{
	eof = _rl_vi_domove_callback (_rl_vimvcxt);
	/* Should handle everything, including cleanup, numeric arguments,
	and turning off RL_STATE_VIMOTION */
	if (RL_ISSTATE (RL_STATE_NUMERICARG) == 0)
	_rl_internal_char_cleanup ();

	CALLBACK_READ_RETURN ();
	}
	#endif
	else if (RL_ISSTATE (RL_STATE_NUMERICARG))
	{
	eof = _rl_arg_callback (_rl_argcxt);
	if (eof == 0 && (RL_ISSTATE (RL_STATE_NUMERICARG) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING))
	rl_callback_read_char ();
	/* XXX - this should handle _rl_last_command_was_kill better */
	else if (RL_ISSTATE (RL_STATE_NUMERICARG) == 0)
	_rl_internal_char_cleanup ();

	CALLBACK_READ_RETURN ();
	}
	else if (RL_ISSTATE (RL_STATE_MULTIKEY))
	{
	eof = _rl_dispatch_callback (_rl_kscxt); /* For now */
	while ((eof == -1 \|\| eof == -2) && RL_ISSTATE (RL_STATE_MULTIKEY) && _rl_kscxt && (_rl_kscxt->flags & KSEQ_DISPATCHED))
	eof = _rl_dispatch_callback (_rl_kscxt);
	if (RL_ISSTATE (RL_STATE_MULTIKEY) == 0)
	{
	_rl_internal_char_cleanup ();
	_rl_want_redisplay = 1;
	}
	}
	else if (_rl_callback_func)
	{
	/* This allows functions that simply need to read an additional
	character (like quoted-insert) to register a function to be
	called when input is available. _rl_callback_data is a
	pointer to a struct that has the argument count originally
	passed to the registering function and space for any additional
	parameters. */
	eof = (*_rl_callback_func) (_rl_callback_data);
	/* If the function `deregisters' itself, make sure the data is
	cleaned up. */
	if (_rl_callback_func == 0)
	{
	if (_rl_callback_data)
	{
	_rl_callback_data_dispose (_rl_callback_data);
	_rl_callback_data = 0;
	}
	_rl_internal_char_cleanup ();
	}
	}
	else
	eof = readline_internal_char ();

	RL_CHECK_SIGNALS ();
	if (rl_done == 0 && _rl_want_redisplay)
	{
	(*rl_redisplay_function) ();
	_rl_want_redisplay = 0;
	}

	if (rl_done)
	{
	line = readline_internal_teardown (eof);

	if (rl_deprep_term_function)
	(*rl_deprep_term_function) ();
	#if defined (HANDLE_SIGNALS)
	rl_clear_signals ();
	#endif
	in_handler = 0;
	(*rl_linefunc) (line);

	/* If the user did not clear out the line, do it for him. */
	if (rl_line_buffer[0])
	_rl_init_line_state ();

	/* Redisplay the prompt if readline_handler_{install,remove}
	not called. */
	if (in_handler == 0 && rl_linefunc)
	_rl_callback_newline ();
	}
	}
	while (rl_pending_input \|\| _rl_pushed_input_available () \|\| RL_ISSTATE (RL_STATE_MACROINPUT));

	CALLBACK_READ_RETURN ();
	}

	/* Remove the handler, and make sure the terminal is in its normal state. */
	void
	rl_callback_handler_remove (void)
	{
	rl_linefunc = NULL;
	RL_UNSETSTATE (RL_STATE_CALLBACK);
	RL_CHECK_SIGNALS ();
	if (in_handler)
	{
	in_handler = 0;
	if (rl_deprep_term_function)
	(*rl_deprep_term_function) ();
	#if defined (HANDLE_SIGNALS)
	rl_clear_signals ();
	#endif
	}
	}

	_rl_callback_generic_arg *
	_rl_callback_data_alloc (int count)
	{
	_rl_callback_generic_arg *arg;

	arg = (_rl_callback_generic_arg *)xmalloc (sizeof (_rl_callback_generic_arg));
	arg->count = count;

	arg->i1 = arg->i2 = 0;

	return arg;
	}

	void
	_rl_callback_data_dispose (_rl_callback_generic_arg *arg)
	{
	xfree (arg);
	}

	/* Make sure that this agrees with cases in rl_callback_read_char */
	void
	rl_callback_sigcleanup (void)
	{
	if (RL_ISSTATE (RL_STATE_CALLBACK) == 0)
	return;

	if (RL_ISSTATE (RL_STATE_ISEARCH))
	_rl_isearch_cleanup (_rl_iscxt, 0);
	else if (RL_ISSTATE (RL_STATE_NSEARCH))
	_rl_nsearch_cleanup (_rl_nscxt, 0);
	else if (RL_ISSTATE (RL_STATE_VIMOTION))
	RL_UNSETSTATE (RL_STATE_VIMOTION);
	else if (RL_ISSTATE (RL_STATE_NUMERICARG))
	{
	_rl_argcxt = 0;
	RL_UNSETSTATE (RL_STATE_NUMERICARG);
	}
	else if (RL_ISSTATE (RL_STATE_MULTIKEY))
	RL_UNSETSTATE (RL_STATE_MULTIKEY);
	if (RL_ISSTATE (RL_STATE_CHARSEARCH))
	RL_UNSETSTATE (RL_STATE_CHARSEARCH);

	_rl_callback_func = 0;
	}
	#endif