| 1 | /* callback.c -- functions to use readline as an X `callback' mechanism. */ |
| 2 | |
| 3 | /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the GNU Readline Library, a library for |
| 6 | reading lines of text with interactive input and history editing. |
| 7 | |
| 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. |
| 12 | |
| 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. |
| 17 | |
| 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 |
| 23 | |
| 24 | #if defined (HAVE_CONFIG_H) |
| 25 | # include <config.h> |
| 26 | #endif |
| 27 | |
| 28 | #include "rlconf.h" |
| 29 | |
| 30 | #if defined (READLINE_CALLBACKS) |
| 31 | |
| 32 | #include <sys/types.h> |
| 33 | #include <stdio.h> |
| 34 | |
| 35 | /* System-specific feature definitions and include files. */ |
| 36 | #include "rldefs.h" |
| 37 | #include "readline.h" |
| 38 | #include "rlprivate.h" |
| 39 | |
| 40 | /* **************************************************************** */ |
| 41 | /* */ |
| 42 | /* Callback Readline Functions */ |
| 43 | /* */ |
| 44 | /* **************************************************************** */ |
| 45 | |
| 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. */ |
| 54 | |
| 55 | VFunction *rl_linefunc; /* user callback function */ |
| 56 | static int in_handler; /* terminal_prepped and signals set? */ |
| 57 | |
| 58 | /* Make sure the terminal is set up, initialize readline, and prompt. */ |
| 59 | static void |
| 60 | _rl_callback_newline () |
| 61 | { |
| 62 | rl_initialize (); |
| 63 | |
| 64 | if (in_handler == 0) |
| 65 | { |
| 66 | in_handler = 1; |
| 67 | |
| 68 | (*rl_prep_term_function) (_rl_meta_flag); |
| 69 | |
| 70 | #if defined (HANDLE_SIGNALS) |
| 71 | rl_set_signals (); |
| 72 | #endif |
| 73 | } |
| 74 | |
| 75 | readline_internal_setup (); |
| 76 | } |
| 77 | |
| 78 | /* Install a readline handler, set up the terminal, and issue the prompt. */ |
| 79 | void |
| 80 | rl_callback_handler_install (prompt, linefunc) |
| 81 | char *prompt; |
| 82 | VFunction *linefunc; |
| 83 | { |
| 84 | rl_prompt = prompt; |
| 85 | rl_visible_prompt_length = rl_prompt ? rl_expand_prompt (rl_prompt) : 0; |
| 86 | rl_linefunc = linefunc; |
| 87 | _rl_callback_newline (); |
| 88 | } |
| 89 | |
| 90 | /* Read one character, and dispatch to the handler if it ends the line. */ |
| 91 | void |
| 92 | rl_callback_read_char () |
| 93 | { |
| 94 | char *line; |
| 95 | int eof; |
| 96 | |
| 97 | if (rl_linefunc == NULL) |
| 98 | { |
| 99 | fprintf (stderr, "readline: readline_callback_read_char() called with no handler!\r\n"); |
| 100 | abort (); |
| 101 | } |
| 102 | |
| 103 | eof = readline_internal_char (); |
| 104 | |
| 105 | if (rl_done) |
| 106 | { |
| 107 | line = readline_internal_teardown (eof); |
| 108 | |
| 109 | (*rl_deprep_term_function) (); |
| 110 | #if defined (HANDLE_SIGNALS) |
| 111 | rl_clear_signals (); |
| 112 | #endif |
| 113 | in_handler = 0; |
| 114 | (*rl_linefunc) (line); |
| 115 | |
| 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 (); |
| 119 | |
| 120 | /* Redisplay the prompt if readline_handler_{install,remove} not called. */ |
| 121 | if (in_handler == 0 && rl_linefunc) |
| 122 | _rl_callback_newline (); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | /* Remove the handler, and make sure the terminal is in its normal state. */ |
| 127 | void |
| 128 | rl_callback_handler_remove () |
| 129 | { |
| 130 | rl_linefunc = NULL; |
| 131 | if (in_handler) |
| 132 | { |
| 133 | in_handler = 0; |
| 134 | (*rl_deprep_term_function) (); |
| 135 | #if defined (HANDLE_SIGNALS) |
| 136 | rl_clear_signals (); |
| 137 | #endif |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | #endif |