150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
/* callback.c -- functions to use readline as an X `callback' mechanism. */
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/* Copyright (C) 1987, 1989, 1992 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 1, 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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675 Mass Ave, Cambridge, MA 02139, 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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#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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extern void readline_internal_startup ();
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extern char *readline_internal_teardown ();
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extern int readline_internal_char ();
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extern void _rl_init_line_state ();
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extern int _rl_meta_flag;
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extern char *rl_prompt;
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extern int rl_visible_prompt_length;
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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 readline_char() every time some input is available, and
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readline_char() will call the user's function with the complete text
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read in at each end of line. The terminal is kept prepped and signals
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handled all the time, except during calls to the user's function. */
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VFunction *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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(*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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char *prompt;
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VFunction *linefunc;
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{
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rl_prompt = prompt;
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rl_visible_prompt_length = rl_prompt ? rl_expand_prompt (rl_prompt) : 0;
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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;
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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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eof = readline_internal_char ();
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if (rl_done)
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{
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line = readline_internal_teardown (eof);
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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} 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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}
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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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if (in_handler)
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{
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in_handler = 0;
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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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#endif
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