| 1 | /* callback.c -- functions to use readline as an X `callback' mechanism. */ |
| 2 | |
| 3 | /* Copyright (C) 1987-2005 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 | |
| 34 | #ifdef HAVE_STDLIB_H |
| 35 | # include <stdlib.h> |
| 36 | #else |
| 37 | # include "ansi_stdlib.h" |
| 38 | #endif |
| 39 | |
| 40 | #include <stdio.h> |
| 41 | |
| 42 | /* System-specific feature definitions and include files. */ |
| 43 | #include "rldefs.h" |
| 44 | #include "readline.h" |
| 45 | #include "rlprivate.h" |
| 46 | #include "xmalloc.h" |
| 47 | |
| 48 | /* Private data for callback registration functions. See comments in |
| 49 | rl_callback_read_char for more details. */ |
| 50 | _rl_callback_func_t *_rl_callback_func = 0; |
| 51 | _rl_callback_generic_arg *_rl_callback_data = 0; |
| 52 | |
| 53 | /* **************************************************************** */ |
| 54 | /* */ |
| 55 | /* Callback Readline Functions */ |
| 56 | /* */ |
| 57 | /* **************************************************************** */ |
| 58 | |
| 59 | /* Allow using readline in situations where a program may have multiple |
| 60 | things to handle at once, and dispatches them via select(). Call |
| 61 | rl_callback_handler_install() with the prompt and a function to call |
| 62 | whenever a complete line of input is ready. The user must then |
| 63 | call rl_callback_read_char() every time some input is available, and |
| 64 | rl_callback_read_char() will call the user's function with the complete |
| 65 | text read in at each end of line. The terminal is kept prepped and |
| 66 | signals handled all the time, except during calls to the user's function. */ |
| 67 | |
| 68 | rl_vcpfunc_t *rl_linefunc; /* user callback function */ |
| 69 | static int in_handler; /* terminal_prepped and signals set? */ |
| 70 | |
| 71 | /* Make sure the terminal is set up, initialize readline, and prompt. */ |
| 72 | static void |
| 73 | _rl_callback_newline () |
| 74 | { |
| 75 | rl_initialize (); |
| 76 | |
| 77 | if (in_handler == 0) |
| 78 | { |
| 79 | in_handler = 1; |
| 80 | |
| 81 | if (rl_prep_term_function) |
| 82 | (*rl_prep_term_function) (_rl_meta_flag); |
| 83 | |
| 84 | #if defined (HANDLE_SIGNALS) |
| 85 | rl_set_signals (); |
| 86 | #endif |
| 87 | } |
| 88 | |
| 89 | readline_internal_setup (); |
| 90 | } |
| 91 | |
| 92 | /* Install a readline handler, set up the terminal, and issue the prompt. */ |
| 93 | void |
| 94 | rl_callback_handler_install (prompt, linefunc) |
| 95 | const char *prompt; |
| 96 | rl_vcpfunc_t *linefunc; |
| 97 | { |
| 98 | rl_set_prompt (prompt); |
| 99 | RL_SETSTATE (RL_STATE_CALLBACK); |
| 100 | rl_linefunc = linefunc; |
| 101 | _rl_callback_newline (); |
| 102 | } |
| 103 | |
| 104 | /* Read one character, and dispatch to the handler if it ends the line. */ |
| 105 | void |
| 106 | rl_callback_read_char () |
| 107 | { |
| 108 | char *line; |
| 109 | int eof, jcode; |
| 110 | static procenv_t olevel; |
| 111 | |
| 112 | if (rl_linefunc == NULL) |
| 113 | { |
| 114 | fprintf (stderr, "readline: readline_callback_read_char() called with no handler!\r\n"); |
| 115 | abort (); |
| 116 | } |
| 117 | |
| 118 | memcpy ((void *)olevel, (void *)readline_top_level, sizeof (procenv_t)); |
| 119 | jcode = setjmp (readline_top_level); |
| 120 | if (jcode) |
| 121 | { |
| 122 | (*rl_redisplay_function) (); |
| 123 | _rl_want_redisplay = 0; |
| 124 | memcpy ((void *)readline_top_level, (void *)olevel, sizeof (procenv_t)); |
| 125 | return; |
| 126 | } |
| 127 | |
| 128 | if (RL_ISSTATE (RL_STATE_ISEARCH)) |
| 129 | { |
| 130 | eof = _rl_isearch_callback (_rl_iscxt); |
| 131 | if (eof == 0 && (RL_ISSTATE (RL_STATE_ISEARCH) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING)) |
| 132 | rl_callback_read_char (); |
| 133 | |
| 134 | return; |
| 135 | } |
| 136 | else if (RL_ISSTATE (RL_STATE_NSEARCH)) |
| 137 | { |
| 138 | eof = _rl_nsearch_callback (_rl_nscxt); |
| 139 | return; |
| 140 | } |
| 141 | else if (RL_ISSTATE (RL_STATE_NUMERICARG)) |
| 142 | { |
| 143 | eof = _rl_arg_callback (_rl_argcxt); |
| 144 | if (eof == 0 && (RL_ISSTATE (RL_STATE_NUMERICARG) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING)) |
| 145 | rl_callback_read_char (); |
| 146 | /* XXX - this should handle _rl_last_command_was_kill better */ |
| 147 | else if (RL_ISSTATE (RL_STATE_NUMERICARG) == 0) |
| 148 | _rl_internal_char_cleanup (); |
| 149 | |
| 150 | return; |
| 151 | } |
| 152 | else if (RL_ISSTATE (RL_STATE_MULTIKEY)) |
| 153 | { |
| 154 | eof = _rl_dispatch_callback (_rl_kscxt); /* For now */ |
| 155 | while ((eof == -1 || eof == -2) && RL_ISSTATE (RL_STATE_MULTIKEY) && _rl_kscxt && (_rl_kscxt->flags & KSEQ_DISPATCHED)) |
| 156 | eof = _rl_dispatch_callback (_rl_kscxt); |
| 157 | if (RL_ISSTATE (RL_STATE_MULTIKEY) == 0) |
| 158 | { |
| 159 | _rl_internal_char_cleanup (); |
| 160 | _rl_want_redisplay = 1; |
| 161 | } |
| 162 | } |
| 163 | else if (_rl_callback_func) |
| 164 | { |
| 165 | /* This allows functions that simply need to read an additional character |
| 166 | (like quoted-insert) to register a function to be called when input is |
| 167 | available. _rl_callback_data is simply a pointer to a struct that has |
| 168 | the argument count originally passed to the registering function and |
| 169 | space for any additional parameters. */ |
| 170 | eof = (*_rl_callback_func) (_rl_callback_data); |
| 171 | /* If the function `deregisters' itself, make sure the data is cleaned |
| 172 | up. */ |
| 173 | if (_rl_callback_func == 0) |
| 174 | { |
| 175 | if (_rl_callback_data) |
| 176 | { |
| 177 | _rl_callback_data_dispose (_rl_callback_data); |
| 178 | _rl_callback_data = 0; |
| 179 | } |
| 180 | _rl_internal_char_cleanup (); |
| 181 | } |
| 182 | } |
| 183 | else |
| 184 | eof = readline_internal_char (); |
| 185 | |
| 186 | if (rl_done == 0 && _rl_want_redisplay) |
| 187 | { |
| 188 | (*rl_redisplay_function) (); |
| 189 | _rl_want_redisplay = 0; |
| 190 | } |
| 191 | |
| 192 | /* We loop in case some function has pushed input back with rl_execute_next. */ |
| 193 | for (;;) |
| 194 | { |
| 195 | if (rl_done) |
| 196 | { |
| 197 | line = readline_internal_teardown (eof); |
| 198 | |
| 199 | if (rl_deprep_term_function) |
| 200 | (*rl_deprep_term_function) (); |
| 201 | #if defined (HANDLE_SIGNALS) |
| 202 | rl_clear_signals (); |
| 203 | #endif |
| 204 | in_handler = 0; |
| 205 | (*rl_linefunc) (line); |
| 206 | |
| 207 | /* If the user did not clear out the line, do it for him. */ |
| 208 | if (rl_line_buffer[0]) |
| 209 | _rl_init_line_state (); |
| 210 | |
| 211 | /* Redisplay the prompt if readline_handler_{install,remove} |
| 212 | not called. */ |
| 213 | if (in_handler == 0 && rl_linefunc) |
| 214 | _rl_callback_newline (); |
| 215 | } |
| 216 | if (rl_pending_input || _rl_pushed_input_available () || RL_ISSTATE (RL_STATE_MACROINPUT)) |
| 217 | eof = readline_internal_char (); |
| 218 | else |
| 219 | break; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /* Remove the handler, and make sure the terminal is in its normal state. */ |
| 224 | void |
| 225 | rl_callback_handler_remove () |
| 226 | { |
| 227 | rl_linefunc = NULL; |
| 228 | RL_UNSETSTATE (RL_STATE_CALLBACK); |
| 229 | if (in_handler) |
| 230 | { |
| 231 | in_handler = 0; |
| 232 | if (rl_deprep_term_function) |
| 233 | (*rl_deprep_term_function) (); |
| 234 | #if defined (HANDLE_SIGNALS) |
| 235 | rl_clear_signals (); |
| 236 | #endif |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | _rl_callback_generic_arg * |
| 241 | _rl_callback_data_alloc (count) |
| 242 | int count; |
| 243 | { |
| 244 | _rl_callback_generic_arg *arg; |
| 245 | |
| 246 | arg = (_rl_callback_generic_arg *)xmalloc (sizeof (_rl_callback_generic_arg)); |
| 247 | arg->count = count; |
| 248 | |
| 249 | arg->i1 = arg->i2 = 0; |
| 250 | |
| 251 | return arg; |
| 252 | } |
| 253 | |
| 254 | void _rl_callback_data_dispose (arg) |
| 255 | _rl_callback_generic_arg *arg; |
| 256 | { |
| 257 | if (arg) |
| 258 | free (arg); |
| 259 | } |
| 260 | |
| 261 | #endif |