150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
/* callback.c -- functions to use readline as an X `callback' mechanism. */
|
|
|
|
/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU Readline Library, a library for
|
|
reading lines of text with interactive input and history editing.
|
|
|
|
The GNU Readline Library 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 1, or
|
|
(at your option) any later version.
|
|
|
|
The GNU Readline Library 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.
|
|
|
|
The GNU General Public License is often shipped with GNU software, and
|
|
is generally kept in a file called COPYING or LICENSE. If you do not
|
|
have a copy of the license, write to the Free Software Foundation,
|
|
675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
#define READLINE_LIBRARY
|
|
|
|
#if defined (HAVE_CONFIG_H)
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#include "rlconf.h"
|
|
|
|
#if defined (READLINE_CALLBACKS)
|
|
|
|
#include <sys/types.h>
|
|
#include <stdio.h>
|
|
|
|
/* System-specific feature definitions and include files. */
|
|
#include "rldefs.h"
|
|
#include "readline.h"
|
|
|
|
extern void readline_internal_setup ();
|
|
extern char *readline_internal_teardown ();
|
|
extern int readline_internal_char ();
|
|
extern void _rl_init_line_state ();
|
|
|
|
extern int _rl_meta_flag;
|
|
extern char *rl_prompt;
|
|
extern int rl_visible_prompt_length;
|
|
|
|
/* **************************************************************** */
|
|
/* */
|
|
/* 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 and
|
|
signals handled all the time, except during calls to the user's function. */
|
|
|
|
VFunction *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 ()
|
|
{
|
|
rl_initialize ();
|
|
|
|
if (in_handler == 0)
|
|
{
|
|
in_handler = 1;
|
|
|
|
(*rl_prep_term_function) (_rl_meta_flag);
|
|
|
|
#if defined (HANDLE_SIGNALS)
|
|
rl_set_signals ();
|
|
#endif
|
|
}
|
|
|
|
readline_internal_setup ();
|
|
}
|
|
|
|
/* Install a readline handler, set up the terminal, and issue the prompt. */
|
|
void
|
|
rl_callback_handler_install (prompt, linefunc)
|
|
char *prompt;
|
|
VFunction *linefunc;
|
|
{
|
|
rl_prompt = prompt;
|
|
rl_visible_prompt_length = rl_prompt ? rl_expand_prompt (rl_prompt) : 0;
|
|
rl_linefunc = linefunc;
|
|
_rl_callback_newline ();
|
|
}
|
|
|
|
/* Read one character, and dispatch to the handler if it ends the line. */
|
|
void
|
|
rl_callback_read_char ()
|
|
{
|
|
char *line;
|
|
int eof;
|
|
|
|
if (rl_linefunc == NULL)
|
|
{
|
|
fprintf (stderr, "readline: readline_callback_read_char() called with no handler!\r\n");
|
|
abort ();
|
|
}
|
|
|
|
eof = readline_internal_char ();
|
|
|
|
if (rl_done)
|
|
{
|
|
line = readline_internal_teardown (eof);
|
|
|
|
(*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 ();
|
|
}
|
|
}
|
|
|
|
/* Remove the handler, and make sure the terminal is in its normal state. */
|
|
void
|
|
rl_callback_handler_remove ()
|
|
{
|
|
rl_linefunc = NULL;
|
|
if (in_handler)
|
|
{
|
|
in_handler = 0;
|
|
(*rl_deprep_term_function) ();
|
|
#if defined (HANDLE_SIGNALS)
|
|
rl_clear_signals ();
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#endif
|