261 lines
7.2 KiB
C
261 lines
7.2 KiB
C
/* callback.c -- functions to use readline as an X `callback' mechanism. */
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/* Copyright (C) 1987-2005 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library, a library for
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reading lines of text with interactive input and history editing.
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The GNU Readline Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2, or
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(at your option) any later version.
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The GNU Readline Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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# include <config.h>
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#endif
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#include "rlconf.h"
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#if defined (READLINE_CALLBACKS)
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#include <sys/types.h>
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#else
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# include "ansi_stdlib.h"
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#endif
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#include <stdio.h>
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/* System-specific feature definitions and include files. */
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#include "rldefs.h"
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#include "readline.h"
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#include "rlprivate.h"
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/* Private data for callback registration functions. See comments in
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rl_callback_read_char for more details. */
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_rl_callback_func_t *_rl_callback_func = 0;
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_rl_callback_generic_arg *_rl_callback_data = 0;
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/* **************************************************************** */
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/* */
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/* Callback Readline Functions */
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/* */
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/* **************************************************************** */
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/* Allow using readline in situations where a program may have multiple
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things to handle at once, and dispatches them via select(). Call
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rl_callback_handler_install() with the prompt and a function to call
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whenever a complete line of input is ready. The user must then
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call rl_callback_read_char() every time some input is available, and
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rl_callback_read_char() will call the user's function with the complete
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text read in at each end of line. The terminal is kept prepped and
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signals handled all the time, except during calls to the user's function. */
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rl_vcpfunc_t *rl_linefunc; /* user callback function */
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static int in_handler; /* terminal_prepped and signals set? */
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/* Make sure the terminal is set up, initialize readline, and prompt. */
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static void
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_rl_callback_newline ()
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{
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rl_initialize ();
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if (in_handler == 0)
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{
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in_handler = 1;
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if (rl_prep_term_function)
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(*rl_prep_term_function) (_rl_meta_flag);
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#if defined (HANDLE_SIGNALS)
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rl_set_signals ();
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#endif
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}
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readline_internal_setup ();
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}
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/* Install a readline handler, set up the terminal, and issue the prompt. */
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void
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rl_callback_handler_install (prompt, linefunc)
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const char *prompt;
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rl_vcpfunc_t *linefunc;
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{
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rl_set_prompt (prompt);
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RL_SETSTATE (RL_STATE_CALLBACK);
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rl_linefunc = linefunc;
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_rl_callback_newline ();
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}
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/* Read one character, and dispatch to the handler if it ends the line. */
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void
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rl_callback_read_char ()
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{
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char *line;
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int eof, jcode;
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static procenv_t olevel;
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if (rl_linefunc == NULL)
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{
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fprintf (stderr, "readline: readline_callback_read_char() called with no handler!\r\n");
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abort ();
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}
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memcpy ((void *)olevel, (void *)readline_top_level, sizeof (procenv_t));
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jcode = setjmp (readline_top_level);
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if (jcode)
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{
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(*rl_redisplay_function) ();
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_rl_want_redisplay = 0;
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memcpy ((void *)readline_top_level, (void *)olevel, sizeof (procenv_t));
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return;
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}
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if (RL_ISSTATE (RL_STATE_ISEARCH))
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{
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eof = _rl_isearch_callback (_rl_iscxt);
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if (eof == 0 && (RL_ISSTATE (RL_STATE_ISEARCH) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING))
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rl_callback_read_char ();
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return;
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}
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else if (RL_ISSTATE (RL_STATE_NSEARCH))
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{
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eof = _rl_nsearch_callback (_rl_nscxt);
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return;
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}
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else if (RL_ISSTATE (RL_STATE_NUMERICARG))
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{
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eof = _rl_arg_callback (_rl_argcxt);
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if (eof == 0 && (RL_ISSTATE (RL_STATE_NUMERICARG) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING))
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rl_callback_read_char ();
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/* XXX - this should handle _rl_last_command_was_kill better */
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else if (RL_ISSTATE (RL_STATE_NUMERICARG) == 0)
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_rl_internal_char_cleanup ();
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return;
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}
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else if (RL_ISSTATE (RL_STATE_MULTIKEY))
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{
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eof = _rl_dispatch_callback (_rl_kscxt); /* For now */
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while ((eof == -1 || eof == -2) && RL_ISSTATE (RL_STATE_MULTIKEY) && _rl_kscxt && (_rl_kscxt->flags & KSEQ_DISPATCHED))
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eof = _rl_dispatch_callback (_rl_kscxt);
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if (RL_ISSTATE (RL_STATE_MULTIKEY) == 0)
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{
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_rl_internal_char_cleanup ();
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_rl_want_redisplay = 1;
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}
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}
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else if (_rl_callback_func)
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{
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/* This allows functions that simply need to read an additional character
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(like quoted-insert) to register a function to be called when input is
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available. _rl_callback_data is simply a pointer to a struct that has
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the argument count originally passed to the registering function and
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space for any additional parameters. */
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eof = (*_rl_callback_func) (_rl_callback_data);
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/* If the function `deregisters' itself, make sure the data is cleaned
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up. */
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if (_rl_callback_func == 0)
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{
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if (_rl_callback_data)
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{
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_rl_callback_data_dispose (_rl_callback_data);
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_rl_callback_data = 0;
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}
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_rl_internal_char_cleanup ();
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}
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}
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else
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eof = readline_internal_char ();
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if (rl_done == 0 && _rl_want_redisplay)
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{
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(*rl_redisplay_function) ();
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_rl_want_redisplay = 0;
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}
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/* We loop in case some function has pushed input back with rl_execute_next. */
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for (;;)
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{
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if (rl_done)
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{
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line = readline_internal_teardown (eof);
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if (rl_deprep_term_function)
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(*rl_deprep_term_function) ();
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#if defined (HANDLE_SIGNALS)
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rl_clear_signals ();
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#endif
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in_handler = 0;
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(*rl_linefunc) (line);
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/* If the user did not clear out the line, do it for him. */
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if (rl_line_buffer[0])
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_rl_init_line_state ();
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/* Redisplay the prompt if readline_handler_{install,remove}
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not called. */
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if (in_handler == 0 && rl_linefunc)
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_rl_callback_newline ();
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}
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if (rl_pending_input || _rl_pushed_input_available () || RL_ISSTATE (RL_STATE_MACROINPUT))
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eof = readline_internal_char ();
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else
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break;
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}
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}
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/* Remove the handler, and make sure the terminal is in its normal state. */
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void
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rl_callback_handler_remove ()
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{
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rl_linefunc = NULL;
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RL_UNSETSTATE (RL_STATE_CALLBACK);
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if (in_handler)
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{
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in_handler = 0;
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if (rl_deprep_term_function)
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(*rl_deprep_term_function) ();
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#if defined (HANDLE_SIGNALS)
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rl_clear_signals ();
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#endif
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}
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}
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_rl_callback_generic_arg *
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_rl_callback_data_alloc (count)
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int count;
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{
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_rl_callback_generic_arg *arg;
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arg = (_rl_callback_generic_arg *)xmalloc (sizeof (_rl_callback_generic_arg));
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arg->count = count;
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arg->i1 = arg->i2 = 0;
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return arg;
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}
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void _rl_callback_data_dispose (arg)
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_rl_callback_generic_arg *arg;
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{
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if (arg)
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free (arg);
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}
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#endif
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