1 /* callback.c -- functions to use readline as an X `callback' mechanism. */
3 /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
5 This file is part of the GNU Readline Library, a library for
6 reading lines of text with interactive input and history editing.
8 The GNU Readline Library is free software; you can redistribute it
9 and/or modify it under the terms of the GNU General Public License
10 as published by the Free Software Foundation; either version 1, or
11 (at your option) any later version.
13 The GNU Readline Library is distributed in the hope that it will be
14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 The GNU General Public License is often shipped with GNU software, and
19 is generally kept in a file called COPYING or LICENSE. If you do not
20 have a copy of the license, write to the Free Software Foundation,
21 675 Mass Ave, Cambridge, MA 02139, USA. */
22 #define READLINE_LIBRARY
24 #if defined (HAVE_CONFIG_H)
30 #if defined (READLINE_CALLBACKS)
32 #include <sys/types.h>
35 /* System-specific feature definitions and include files. */
39 extern void readline_internal_startup ();
40 extern char *readline_internal_teardown ();
41 extern int readline_internal_char ();
43 extern int _rl_meta_flag;
44 extern char *rl_prompt;
45 extern int rl_visible_prompt_length;
47 /* **************************************************************** */
49 /* Callback Readline Functions */
51 /* **************************************************************** */
53 /* Allow using readline in situations where a program may have multiple
54 things to handle at once, and dispatches them via select(). Call
55 rl_callback_handler_install() with the prompt and a function to call
56 whenever a complete line of input is ready. The user must then
57 call readline_char() every time some input is available, and
58 readline_char() will call the user's function with the complete text
59 read in at each end of line. The terminal is kept prepped and signals
60 handled all the time, except during calls to the user's function. */
62 VFunction *rl_linefunc; /* user callback function */
63 static int in_handler; /* terminal_prepped and signals set? */
65 /* Make sure the terminal is set up, initialize readline, and prompt. */
67 _rl_callback_newline ()
75 (*rl_prep_term_function) (_rl_meta_flag);
77 #if defined (HANDLE_SIGNALS)
82 readline_internal_setup ();
85 /* Install a readline handler, set up the terminal, and issue the prompt. */
87 rl_callback_handler_install (prompt, linefunc)
92 rl_visible_prompt_length = rl_prompt ? rl_expand_prompt (rl_prompt) : 0;
93 rl_linefunc = linefunc;
94 _rl_callback_newline ();
97 /* Read one character, and dispatch to the handler if it ends the line. */
99 rl_callback_read_char ()
104 if (rl_linefunc == NULL)
106 fprintf (stderr, "readline: readline_callback_read_char() called with no handler!\r\n");
110 eof = readline_internal_char ();
114 line = readline_internal_teardown (eof);
116 (*rl_deprep_term_function) ();
117 #if defined (HANDLE_SIGNALS)
121 (*rl_linefunc) (line);
123 /* Redisplay the prompt if readline_handler_{install,remove} not called. */
124 if (in_handler == 0 && rl_linefunc)
125 _rl_callback_newline ();
129 /* Remove the handler, and make sure the terminal is in its normal state. */
131 rl_callback_handler_remove ()
137 (*rl_deprep_term_function) ();
138 #if defined (HANDLE_SIGNALS)