| /* 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_startup (); |
| 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 |