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 2, 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 59 Temple Place, Suite 330, Boston, MA 02111 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. */
38 #include "rlprivate.h"
40 /* **************************************************************** */
42 /* Callback Readline Functions */
44 /* **************************************************************** */
46 /* Allow using readline in situations where a program may have multiple
47 things to handle at once, and dispatches them via select(). Call
48 rl_callback_handler_install() with the prompt and a function to call
49 whenever a complete line of input is ready. The user must then
50 call rl_callback_read_char() every time some input is available, and
51 rl_callback_read_char() will call the user's function with the complete
52 text read in at each end of line. The terminal is kept prepped and
53 signals handled all the time, except during calls to the user's function. */
55 VFunction
*rl_linefunc
; /* user callback function */
56 static int in_handler
; /* terminal_prepped and signals set? */
58 /* Make sure the terminal is set up, initialize readline, and prompt. */
60 _rl_callback_newline ()
68 (*rl_prep_term_function
) (_rl_meta_flag
);
70 #if defined (HANDLE_SIGNALS)
75 readline_internal_setup ();
78 /* Install a readline handler, set up the terminal, and issue the prompt. */
80 rl_callback_handler_install (prompt
, linefunc
)
85 rl_visible_prompt_length
= rl_prompt
? rl_expand_prompt (rl_prompt
) : 0;
86 rl_linefunc
= linefunc
;
87 _rl_callback_newline ();
90 /* Read one character, and dispatch to the handler if it ends the line. */
92 rl_callback_read_char ()
97 if (rl_linefunc
== NULL
)
99 fprintf (stderr
, "readline: readline_callback_read_char() called with no handler!\r\n");
103 eof
= readline_internal_char ();
107 line
= readline_internal_teardown (eof
);
109 (*rl_deprep_term_function
) ();
110 #if defined (HANDLE_SIGNALS)
114 (*rl_linefunc
) (line
);
116 /* If the user did not clear out the line, do it for him. */
117 if (rl_line_buffer
[0])
118 _rl_init_line_state ();
120 /* Redisplay the prompt if readline_handler_{install,remove} not called. */
121 if (in_handler
== 0 && rl_linefunc
)
122 _rl_callback_newline ();
126 /* Remove the handler, and make sure the terminal is in its normal state. */
128 rl_callback_handler_remove ()
134 (*rl_deprep_term_function
) ();
135 #if defined (HANDLE_SIGNALS)
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