callback.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:4k
- /* 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!rn");
- 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