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callback.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/bash/src/lib/readline/callback.c
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1/* callback.c -- functions to use readline as an X `callback' mechanism. */-
2-
3/* Copyright (C) 1987-2017 Free Software Foundation, Inc.-
4-
5 This file is part of the GNU Readline Library (Readline), a library-
6 for reading lines of text with interactive input and history editing.-
7-
8 Readline is free software: you can redistribute it and/or modify-
9 it under the terms of the GNU General Public License as published by-
10 the Free Software Foundation, either version 3 of the License, or-
11 (at your option) any later version.-
12-
13 Readline is distributed in the hope that it will be useful,-
14 but WITHOUT ANY WARRANTY; without even the implied warranty of-
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the-
16 GNU General Public License for more details.-
17-
18 You should have received a copy of the GNU General Public License-
19 along with Readline. If not, see <http://www.gnu.org/licenses/>.-
20*/-
21-
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/* Applications can set this to non-zero to have readline's signal handlers-
54 installed during the entire duration of reading a complete line, as in-
55 readline-6.2. This should be used with care, because it can result in-
56 readline receiving signals and not handling them until it's called again-
57 via rl_callback_read_char, thereby stealing them from the application.-
58 By default, signal handlers are only active while readline is active. */ -
59int rl_persistent_signal_handlers = 0;-
60-
61/* **************************************************************** */-
62/* */-
63/* Callback Readline Functions */-
64/* */-
65/* **************************************************************** */-
66-
67/* Allow using readline in situations where a program may have multiple-
68 things to handle at once, and dispatches them via select(). Call-
69 rl_callback_handler_install() with the prompt and a function to call-
70 whenever a complete line of input is ready. The user must then-
71 call rl_callback_read_char() every time some input is available, and -
72 rl_callback_read_char() will call the user's function with the complete-
73 text read in at each end of line. The terminal is kept prepped-
74 all the time, except during calls to the user's function. Signal-
75 handlers are only installed when the application calls back into-
76 readline, so readline doesn't `steal' signals from the application. */-
77-
78rl_vcpfunc_t *rl_linefunc; /* user callback function */-
79static int in_handler; /* terminal_prepped and signals set? */-
80-
81/* Make sure the terminal is set up, initialize readline, and prompt. */-
82static void-
83_rl_callback_newline (void)-
84{-
85 rl_initialize ();-
86-
87 if (in_handler == 0)
in_handler == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
88 {-
89 in_handler = 1;-
90-
91 if (rl_prep_term_function)
rl_prep_term_functionDescription
TRUEnever evaluated
FALSEnever evaluated
0
92 (*rl_prep_term_function) (_rl_meta_flag);
never executed: (*rl_prep_term_function) (_rl_meta_flag);
0
93-
94#if defined (HANDLE_SIGNALS)-
95 if (rl_persistent_signal_handlers)
rl_persistent_signal_handlersDescription
TRUEnever evaluated
FALSEnever evaluated
0
96 rl_set_signals ();
never executed: rl_set_signals ();
0
97#endif-
98 }
never executed: end of block
0
99-
100 readline_internal_setup ();-
101 RL_CHECK_SIGNALS ();
never executed: _rl_signal_handler (_rl_caught_signal);
_rl_caught_signalDescription
TRUEnever evaluated
FALSEnever evaluated
0
102}
never executed: end of block
0
103-
104/* Install a readline handler, set up the terminal, and issue the prompt. */-
105void-
106rl_callback_handler_install (const char *prompt, rl_vcpfunc_t *linefunc)-
107{-
108 rl_set_prompt (prompt);-
109 RL_SETSTATE (RL_STATE_CALLBACK);-
110 rl_linefunc = linefunc;-
111 _rl_callback_newline ();-
112}
never executed: end of block
0
113-
114#if defined (HANDLE_SIGNALS)-
115#define CALLBACK_READ_RETURN() \-
116 do { \-
117 if (rl_persistent_signal_handlers == 0) \-
118 rl_clear_signals (); \-
119 return; \-
120 } while (0)-
121#else-
122#define CALLBACK_READ_RETURN() return-
123#endif-
124-
125/* Read one character, and dispatch to the handler if it ends the line. */-
126void-
127rl_callback_read_char (void)-
128{-
129 char *line;-
130 int eof, jcode;-
131 static procenv_t olevel;-
132-
133 if (rl_linefunc == NULL)
rl_linefunc == ((void *)0)Description
TRUEnever evaluated
FALSEnever evaluated
0
134 {-
135 _rl_errmsg ("readline_callback_read_char() called with no handler!");-
136 abort ();
never executed: abort ();
0
137 }-
138-
139 memcpy ((void *)olevel, (void *)_rl_top_level, sizeof (procenv_t));-
140#if defined (HAVE_POSIX_SIGSETJMP)-
141 jcode = sigsetjmp (_rl_top_level, 0);-
142#else-
143 jcode = setjmp (_rl_top_level);-
144#endif-
145 if (jcode)
jcodeDescription
TRUEnever evaluated
FALSEnever evaluated
0
146 {-
147 (*rl_redisplay_function) ();-
148 _rl_want_redisplay = 0;-
149 memcpy ((void *)_rl_top_level, (void *)olevel, sizeof (procenv_t));-
150 CALLBACK_READ_RETURN ();
never executed: return;
never executed: rl_clear_signals ();
rl_persistent_..._handlers == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
151 }-
152-
153#if defined (HANDLE_SIGNALS)-
154 /* Install signal handlers only when readline has control. */-
155 if (rl_persistent_signal_handlers == 0)
rl_persistent_..._handlers == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
156 rl_set_signals ();
never executed: rl_set_signals ();
0
157#endif-
158-
159 do-
160 {-
161 RL_CHECK_SIGNALS ();
never executed: _rl_signal_handler (_rl_caught_signal);
_rl_caught_signalDescription
TRUEnever evaluated
FALSEnever evaluated
0
162 if (RL_ISSTATE (RL_STATE_ISEARCH))
(rl_readline_s...& (0x0000080))Description
TRUEnever evaluated
FALSEnever evaluated
0
163 {-
164 eof = _rl_isearch_callback (_rl_iscxt);-
165 if (eof == 0 && (RL_ISSTATE (RL_STATE_ISEARCH) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING))
eof == 0Description
TRUEnever evaluated
FALSEnever evaluated
((rl_readline_...000080)) == 0)Description
TRUEnever evaluated
FALSEnever evaluated
(rl_readline_s...& (0x0020000))Description
TRUEnever evaluated
FALSEnever evaluated
0
166 rl_callback_read_char ();
never executed: rl_callback_read_char ();
0
167-
168 CALLBACK_READ_RETURN ();
never executed: return;
never executed: rl_clear_signals ();
rl_persistent_..._handlers == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
169 }-
170 else if (RL_ISSTATE (RL_STATE_NSEARCH))
(rl_readline_s...& (0x0000100))Description
TRUEnever evaluated
FALSEnever evaluated
0
171 {-
172 eof = _rl_nsearch_callback (_rl_nscxt);-
173-
174 CALLBACK_READ_RETURN ();
never executed: return;
never executed: rl_clear_signals ();
rl_persistent_..._handlers == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
175 }-
176#if defined (VI_MODE)-
177 /* States that can occur while in state VIMOTION have to be checked-
178 before RL_STATE_VIMOTION */-
179 else if (RL_ISSTATE (RL_STATE_CHARSEARCH))
(rl_readline_s...& (0x0800000))Description
TRUEnever evaluated
FALSEnever evaluated
0
180 {-
181 int k;-
182-
183 k = _rl_callback_data->i2;-
184-
185 eof = (*_rl_callback_func) (_rl_callback_data);-
186 /* If the function `deregisters' itself, make sure the data is-
187 cleaned up. */-
188 if (_rl_callback_func == 0) /* XXX - just sanity check */
_rl_callback_func == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
189 {-
190 if (_rl_callback_data)
_rl_callback_dataDescription
TRUEnever evaluated
FALSEnever evaluated
0
191 {-
192 _rl_callback_data_dispose (_rl_callback_data);-
193 _rl_callback_data = 0;-
194 }
never executed: end of block
0
195 }
never executed: end of block
0
196-
197 /* Messy case where vi motion command can be char search */-
198 if (RL_ISSTATE (RL_STATE_VIMOTION))
(rl_readline_s...& (0x0100000))Description
TRUEnever evaluated
FALSEnever evaluated
0
199 {-
200 _rl_vi_domove_motion_cleanup (k, _rl_vimvcxt);-
201 _rl_internal_char_cleanup ();-
202 CALLBACK_READ_RETURN ();
never executed: return;
never executed: rl_clear_signals ();
rl_persistent_..._handlers == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
203 }-
204-
205 _rl_internal_char_cleanup ();-
206 }
never executed: end of block
0
207 else if (RL_ISSTATE (RL_STATE_VIMOTION))
(rl_readline_s...& (0x0100000))Description
TRUEnever evaluated
FALSEnever evaluated
0
208 {-
209 eof = _rl_vi_domove_callback (_rl_vimvcxt);-
210 /* Should handle everything, including cleanup, numeric arguments,-
211 and turning off RL_STATE_VIMOTION */-
212 if (RL_ISSTATE (RL_STATE_NUMERICARG) == 0)
(rl_readline_s...0000400)) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
213 _rl_internal_char_cleanup ();
never executed: _rl_internal_char_cleanup ();
0
214-
215 CALLBACK_READ_RETURN ();
never executed: return;
never executed: rl_clear_signals ();
rl_persistent_..._handlers == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
216 }-
217#endif-
218 else if (RL_ISSTATE (RL_STATE_NUMERICARG))
(rl_readline_s...& (0x0000400))Description
TRUEnever evaluated
FALSEnever evaluated
0
219 {-
220 eof = _rl_arg_callback (_rl_argcxt);-
221 if (eof == 0 && (RL_ISSTATE (RL_STATE_NUMERICARG) == 0) && RL_ISSTATE (RL_STATE_INPUTPENDING))
eof == 0Description
TRUEnever evaluated
FALSEnever evaluated
((rl_readline_...000400)) == 0)Description
TRUEnever evaluated
FALSEnever evaluated
(rl_readline_s...& (0x0020000))Description
TRUEnever evaluated
FALSEnever evaluated
0
222 rl_callback_read_char ();
never executed: rl_callback_read_char ();
0
223 /* XXX - this should handle _rl_last_command_was_kill better */-
224 else if (RL_ISSTATE (RL_STATE_NUMERICARG) == 0)
(rl_readline_s...0000400)) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
225 _rl_internal_char_cleanup ();
never executed: _rl_internal_char_cleanup ();
0
226-
227 CALLBACK_READ_RETURN ();
never executed: return;
never executed: rl_clear_signals ();
rl_persistent_..._handlers == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
228 }-
229 else if (RL_ISSTATE (RL_STATE_MULTIKEY))
(rl_readline_s...& (0x0200000))Description
TRUEnever evaluated
FALSEnever evaluated
0
230 {-
231 eof = _rl_dispatch_callback (_rl_kscxt); /* For now */-
232 while ((eof == -1 || eof == -2) && RL_ISSTATE (RL_STATE_MULTIKEY) && _rl_kscxt && (_rl_kscxt->flags & KSEQ_DISPATCHED))
eof == -1Description
TRUEnever evaluated
FALSEnever evaluated
eof == -2Description
TRUEnever evaluated
FALSEnever evaluated
(rl_readline_s...& (0x0200000))Description
TRUEnever evaluated
FALSEnever evaluated
_rl_kscxtDescription
TRUEnever evaluated
FALSEnever evaluated
(_rl_kscxt->flags & 0x01)Description
TRUEnever evaluated
FALSEnever evaluated
0
233 eof = _rl_dispatch_callback (_rl_kscxt);
never executed: eof = _rl_dispatch_callback (_rl_kscxt);
0
234 if (RL_ISSTATE (RL_STATE_MULTIKEY) == 0)
(rl_readline_s...0200000)) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
235 {-
236 _rl_internal_char_cleanup ();-
237 _rl_want_redisplay = 1;-
238 }
never executed: end of block
0
239 }
never executed: end of block
0
240 else if (_rl_callback_func)
_rl_callback_funcDescription
TRUEnever evaluated
FALSEnever evaluated
0
241 {-
242 /* This allows functions that simply need to read an additional-
243 character (like quoted-insert) to register a function to be-
244 called when input is available. _rl_callback_data is a-
245 pointer to a struct that has the argument count originally-
246 passed to the registering function and space for any additional-
247 parameters. */-
248 eof = (*_rl_callback_func) (_rl_callback_data);-
249 /* If the function `deregisters' itself, make sure the data is-
250 cleaned up. */-
251 if (_rl_callback_func == 0)
_rl_callback_func == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
252 {-
253 if (_rl_callback_data)
_rl_callback_dataDescription
TRUEnever evaluated
FALSEnever evaluated
0
254 {-
255 _rl_callback_data_dispose (_rl_callback_data);-
256 _rl_callback_data = 0;-
257 }
never executed: end of block
0
258 _rl_internal_char_cleanup ();-
259 }
never executed: end of block
0
260 }
never executed: end of block
0
261 else-
262 eof = readline_internal_char ();
never executed: eof = readline_internal_char ();
0
263-
264 RL_CHECK_SIGNALS ();
never executed: _rl_signal_handler (_rl_caught_signal);
_rl_caught_signalDescription
TRUEnever evaluated
FALSEnever evaluated
0
265 if (rl_done == 0 && _rl_want_redisplay)
rl_done == 0Description
TRUEnever evaluated
FALSEnever evaluated
_rl_want_redisplayDescription
TRUEnever evaluated
FALSEnever evaluated
0
266 {-
267 (*rl_redisplay_function) ();-
268 _rl_want_redisplay = 0;-
269 }
never executed: end of block
0
270-
271 if (rl_done)
rl_doneDescription
TRUEnever evaluated
FALSEnever evaluated
0
272 {-
273 line = readline_internal_teardown (eof);-
274-
275 if (rl_deprep_term_function)
rl_deprep_term_functionDescription
TRUEnever evaluated
FALSEnever evaluated
0
276 (*rl_deprep_term_function) ();
never executed: (*rl_deprep_term_function) ();
0
277#if defined (HANDLE_SIGNALS)-
278 rl_clear_signals ();-
279#endif-
280 in_handler = 0;-
281 (*rl_linefunc) (line);-
282-
283 /* If the user did not clear out the line, do it for him. */-
284 if (rl_line_buffer[0])
rl_line_buffer[0]Description
TRUEnever evaluated
FALSEnever evaluated
0
285 _rl_init_line_state ();
never executed: _rl_init_line_state ();
0
286-
287 /* Redisplay the prompt if readline_handler_{install,remove}-
288 not called. */-
289 if (in_handler == 0 && rl_linefunc)
in_handler == 0Description
TRUEnever evaluated
FALSEnever evaluated
rl_linefuncDescription
TRUEnever evaluated
FALSEnever evaluated
0
290 _rl_callback_newline ();
never executed: _rl_callback_newline ();
0
291 }
never executed: end of block
0
292 }
never executed: end of block
0
293 while (rl_pending_input || _rl_pushed_input_available () || RL_ISSTATE (RL_STATE_MACROINPUT));
rl_pending_inputDescription
TRUEnever evaluated
FALSEnever evaluated
_rl_pushed_input_available ()Description
TRUEnever evaluated
FALSEnever evaluated
(rl_readline_s...& (0x0000800))Description
TRUEnever evaluated
FALSEnever evaluated
0
294-
295 CALLBACK_READ_RETURN ();
never executed: return;
never executed: rl_clear_signals ();
rl_persistent_..._handlers == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
296}-
297-
298/* Remove the handler, and make sure the terminal is in its normal state. */-
299void-
300rl_callback_handler_remove (void)-
301{-
302 rl_linefunc = NULL;-
303 RL_UNSETSTATE (RL_STATE_CALLBACK);-
304 RL_CHECK_SIGNALS ();
never executed: _rl_signal_handler (_rl_caught_signal);
_rl_caught_signalDescription
TRUEnever evaluated
FALSEnever evaluated
0
305 if (in_handler)
in_handlerDescription
TRUEnever evaluated
FALSEnever evaluated
0
306 {-
307 in_handler = 0;-
308 if (rl_deprep_term_function)
rl_deprep_term_functionDescription
TRUEnever evaluated
FALSEnever evaluated
0
309 (*rl_deprep_term_function) ();
never executed: (*rl_deprep_term_function) ();
0
310#if defined (HANDLE_SIGNALS)-
311 rl_clear_signals ();-
312#endif-
313 }
never executed: end of block
0
314}
never executed: end of block
0
315-
316_rl_callback_generic_arg *-
317_rl_callback_data_alloc (int count)-
318{-
319 _rl_callback_generic_arg *arg;-
320-
321 arg = (_rl_callback_generic_arg *)xmalloc (sizeof (_rl_callback_generic_arg));-
322 arg->count = count;-
323-
324 arg->i1 = arg->i2 = 0;-
325-
326 return arg;
never executed: return arg;
0
327}-
328-
329void-
330_rl_callback_data_dispose (_rl_callback_generic_arg *arg)-
331{-
332 xfree (arg);-
333}
never executed: end of block
0
334-
335/* Make sure that this agrees with cases in rl_callback_read_char */-
336void-
337rl_callback_sigcleanup (void)-
338{-
339 if (RL_ISSTATE (RL_STATE_CALLBACK) == 0)
(rl_readline_s...0080000)) == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
340 return;
never executed: return;
0
341-
342 if (RL_ISSTATE (RL_STATE_ISEARCH))
(rl_readline_s...& (0x0000080))Description
TRUEnever evaluated
FALSEnever evaluated
0
343 _rl_isearch_cleanup (_rl_iscxt, 0);
never executed: _rl_isearch_cleanup (_rl_iscxt, 0);
0
344 else if (RL_ISSTATE (RL_STATE_NSEARCH))
(rl_readline_s...& (0x0000100))Description
TRUEnever evaluated
FALSEnever evaluated
0
345 _rl_nsearch_cleanup (_rl_nscxt, 0);
never executed: _rl_nsearch_cleanup (_rl_nscxt, 0);
0
346 else if (RL_ISSTATE (RL_STATE_VIMOTION))
(rl_readline_s...& (0x0100000))Description
TRUEnever evaluated
FALSEnever evaluated
0
347 RL_UNSETSTATE (RL_STATE_VIMOTION);
never executed: (rl_readline_state &= ~(0x0100000));
0
348 else if (RL_ISSTATE (RL_STATE_NUMERICARG))
(rl_readline_s...& (0x0000400))Description
TRUEnever evaluated
FALSEnever evaluated
0
349 {-
350 _rl_argcxt = 0;-
351 RL_UNSETSTATE (RL_STATE_NUMERICARG);-
352 }
never executed: end of block
0
353 else if (RL_ISSTATE (RL_STATE_MULTIKEY))
(rl_readline_s...& (0x0200000))Description
TRUEnever evaluated
FALSEnever evaluated
0
354 RL_UNSETSTATE (RL_STATE_MULTIKEY);
never executed: (rl_readline_state &= ~(0x0200000));
0
355 if (RL_ISSTATE (RL_STATE_CHARSEARCH))
(rl_readline_s...& (0x0800000))Description
TRUEnever evaluated
FALSEnever evaluated
0
356 RL_UNSETSTATE (RL_STATE_CHARSEARCH);
never executed: (rl_readline_state &= ~(0x0800000));
0
357-
358 _rl_callback_func = 0;-
359}
never executed: end of block
0
360#endif-
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