OpenCoverage

undo.c

Absolute File Name:/home/opencoverage/opencoverage/guest-scripts/bash/src/lib/readline/undo.c
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1/* undo.c - manage list of changes to lines, offering opportunity to undo them */-
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 <sys/types.h>-
29-
30#if defined (HAVE_UNISTD_H)-
31# include <unistd.h> /* for _POSIX_VERSION */-
32#endif /* HAVE_UNISTD_H */-
33-
34#if defined (HAVE_STDLIB_H)-
35# include <stdlib.h>-
36#else-
37# include "ansi_stdlib.h"-
38#endif /* HAVE_STDLIB_H */-
39-
40#include <stdio.h>-
41-
42/* System-specific feature definitions and include files. */-
43#include "rldefs.h"-
44-
45/* Some standard library routines. */-
46#include "readline.h"-
47#include "history.h"-
48-
49#include "rlprivate.h"-
50#include "xmalloc.h"-
51-
52extern void _hs_replace_history_data PARAMS((int, histdata_t *, histdata_t *));-
53-
54/* Non-zero tells rl_delete_text and rl_insert_text to not add to-
55 the undo list. */-
56int _rl_doing_an_undo = 0;-
57-
58/* How many unclosed undo groups we currently have. */-
59int _rl_undo_group_level = 0;-
60-
61/* The current undo list for THE_LINE. */-
62UNDO_LIST *rl_undo_list = (UNDO_LIST *)NULL;-
63-
64/* **************************************************************** */-
65/* */-
66/* Undo, and Undoing */-
67/* */-
68/* **************************************************************** */-
69-
70static UNDO_LIST *-
71alloc_undo_entry (enum undo_code what, int start, int end, char *text)-
72{-
73 UNDO_LIST *temp;-
74-
75 temp = (UNDO_LIST *)xmalloc (sizeof (UNDO_LIST));-
76 temp->what = what;-
77 temp->start = start;-
78 temp->end = end;-
79 temp->text = text;-
80-
81 temp->next = (UNDO_LIST *)NULL;-
82 return temp;
never executed: return temp;
0
83}-
84-
85/* Remember how to undo something. Concatenate some undos if that-
86 seems right. */-
87void-
88rl_add_undo (enum undo_code what, int start, int end, char *text)-
89{-
90 UNDO_LIST *temp;-
91-
92 temp = alloc_undo_entry (what, start, end, text);-
93 temp->next = rl_undo_list;-
94 rl_undo_list = temp;-
95}
never executed: end of block
0
96-
97/* Free an UNDO_LIST */-
98void-
99_rl_free_undo_list (UNDO_LIST *ul)-
100{-
101 UNDO_LIST *release;-
102-
103 while (ul)
ulDescription
TRUEnever evaluated
FALSEnever evaluated
0
104 {-
105 release = ul;-
106 ul = ul->next;-
107-
108 if (release->what == UNDO_DELETE)
release->what == UNDO_DELETEDescription
TRUEnever evaluated
FALSEnever evaluated
0
109 xfree (release->text);
never executed: xfree (release->text);
0
110-
111 xfree (release);-
112 }
never executed: end of block
0
113}
never executed: end of block
0
114-
115/* Free the existing undo list. */-
116void-
117rl_free_undo_list (void)-
118{-
119 UNDO_LIST *release, *orig_list;-
120-
121 orig_list = rl_undo_list;-
122 _rl_free_undo_list (rl_undo_list);-
123 rl_undo_list = (UNDO_LIST *)NULL;-
124 _hs_replace_history_data (-1, (histdata_t *)orig_list, (histdata_t *)NULL);-
125}
never executed: end of block
0
126-
127UNDO_LIST *-
128_rl_copy_undo_entry (UNDO_LIST *entry)-
129{-
130 UNDO_LIST *new;-
131-
132 new = alloc_undo_entry (entry->what, entry->start, entry->end, (char *)NULL);-
133 new->text = entry->text ? savestring (entry->text) : 0;
entry->textDescription
TRUEnever evaluated
FALSEnever evaluated
0
134 return new;
never executed: return new;
0
135}-
136-
137UNDO_LIST *-
138_rl_copy_undo_list (UNDO_LIST *head)-
139{-
140 UNDO_LIST *list, *new, *roving, *c;-
141-
142 if (head == 0)
head == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
143 return head;
never executed: return head;
0
144-
145 list = head;-
146 new = 0;-
147 while (list)
listDescription
TRUEnever evaluated
FALSEnever evaluated
0
148 {-
149 c = _rl_copy_undo_entry (list);-
150 if (new == 0)
new == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
151 roving = new = c;
never executed: roving = new = c;
0
152 else-
153 {-
154 roving->next = c;-
155 roving = roving->next;-
156 }
never executed: end of block
0
157 list = list->next;-
158 }
never executed: end of block
0
159-
160 roving->next = 0;-
161 return new;
never executed: return new;
0
162}-
163-
164/* Undo the next thing in the list. Return 0 if there-
165 is nothing to undo, or non-zero if there was. */-
166int-
167rl_do_undo (void)-
168{-
169 UNDO_LIST *release;-
170 int waiting_for_begin, start, end;-
171 HIST_ENTRY *cur, *temp;-
172-
173#define TRANS(i) ((i) == -1 ? rl_point : ((i) == -2 ? rl_end : (i)))-
174-
175 start = end = waiting_for_begin = 0;-
176 do-
177 {-
178 if (rl_undo_list == 0)
rl_undo_list == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
179 return (0);
never executed: return (0);
0
180-
181 _rl_doing_an_undo = 1;-
182 RL_SETSTATE(RL_STATE_UNDOING);-
183-
184 /* To better support vi-mode, a start or end value of -1 means-
185 rl_point, and a value of -2 means rl_end. */-
186 if (rl_undo_list->what == UNDO_DELETE || rl_undo_list->what == UNDO_INSERT)
rl_undo_list->...== UNDO_DELETEDescription
TRUEnever evaluated
FALSEnever evaluated
rl_undo_list->...== UNDO_INSERTDescription
TRUEnever evaluated
FALSEnever evaluated
0
187 {-
188 start = TRANS (rl_undo_list->start);
(rl_undo_list->start) == -1Description
TRUEnever evaluated
FALSEnever evaluated
(rl_undo_list->start) == -2Description
TRUEnever evaluated
FALSEnever evaluated
0
189 end = TRANS (rl_undo_list->end);
(rl_undo_list->end) == -1Description
TRUEnever evaluated
FALSEnever evaluated
(rl_undo_list->end) == -2Description
TRUEnever evaluated
FALSEnever evaluated
0
190 }
never executed: end of block
0
191-
192 switch (rl_undo_list->what)-
193 {-
194 /* Undoing deletes means inserting some text. */-
195 case UNDO_DELETE:
never executed: case UNDO_DELETE:
0
196 rl_point = start;-
197 rl_insert_text (rl_undo_list->text);-
198 xfree (rl_undo_list->text);-
199 break;
never executed: break;
0
200-
201 /* Undoing inserts means deleting some text. */-
202 case UNDO_INSERT:
never executed: case UNDO_INSERT:
0
203 rl_delete_text (start, end);-
204 rl_point = start;-
205 break;
never executed: break;
0
206-
207 /* Undoing an END means undoing everything 'til we get to a BEGIN. */-
208 case UNDO_END:
never executed: case UNDO_END:
0
209 waiting_for_begin++;-
210 break;
never executed: break;
0
211-
212 /* Undoing a BEGIN means that we are done with this group. */-
213 case UNDO_BEGIN:
never executed: case UNDO_BEGIN:
0
214 if (waiting_for_begin)
waiting_for_beginDescription
TRUEnever evaluated
FALSEnever evaluated
0
215 waiting_for_begin--;
never executed: waiting_for_begin--;
0
216 else-
217 rl_ding ();
never executed: rl_ding ();
0
218 break;
never executed: break;
0
219 }-
220-
221 _rl_doing_an_undo = 0;-
222 RL_UNSETSTATE(RL_STATE_UNDOING);-
223-
224 release = rl_undo_list;-
225 rl_undo_list = rl_undo_list->next;-
226-
227 /* If we are editing a history entry, make sure the change is replicated-
228 in the history entry's line */-
229 cur = current_history ();-
230 if (cur && cur->data && (UNDO_LIST *)cur->data == release)
curDescription
TRUEnever evaluated
FALSEnever evaluated
cur->dataDescription
TRUEnever evaluated
FALSEnever evaluated
(UNDO_LIST *)c...ata == releaseDescription
TRUEnever evaluated
FALSEnever evaluated
0
231 {-
232 temp = replace_history_entry (where_history (), rl_line_buffer, (histdata_t)rl_undo_list);-
233 xfree (temp->line);-
234 FREE (temp->timestamp);
never executed: free (temp->timestamp);
temp->timestampDescription
TRUEnever evaluated
FALSEnever evaluated
0
235 xfree (temp);-
236 }
never executed: end of block
0
237-
238 _hs_replace_history_data (-1, (histdata_t *)release, (histdata_t *)rl_undo_list);-
239-
240 xfree (release);-
241 }
never executed: end of block
0
242 while (waiting_for_begin);
waiting_for_beginDescription
TRUEnever evaluated
FALSEnever evaluated
0
243-
244 return (1);
never executed: return (1);
0
245}-
246#undef TRANS-
247-
248int-
249_rl_fix_last_undo_of_type (int type, int start, int end)-
250{-
251 UNDO_LIST *rl;-
252-
253 for (rl = rl_undo_list; rl; rl = rl->next)
rlDescription
TRUEnever evaluated
FALSEnever evaluated
0
254 {-
255 if (rl->what == type)
rl->what == typeDescription
TRUEnever evaluated
FALSEnever evaluated
0
256 {-
257 rl->start = start;-
258 rl->end = end;-
259 return 0;
never executed: return 0;
0
260 }-
261 }
never executed: end of block
0
262 return 1;
never executed: return 1;
0
263}-
264-
265/* Begin a group. Subsequent undos are undone as an atomic operation. */-
266int-
267rl_begin_undo_group (void)-
268{-
269 rl_add_undo (UNDO_BEGIN, 0, 0, 0);-
270 _rl_undo_group_level++;-
271 return 0;
never executed: return 0;
0
272}-
273-
274/* End an undo group started with rl_begin_undo_group (). */-
275int-
276rl_end_undo_group (void)-
277{-
278 rl_add_undo (UNDO_END, 0, 0, 0);-
279 _rl_undo_group_level--;-
280 return 0;
never executed: return 0;
0
281}-
282-
283/* Save an undo entry for the text from START to END. */-
284int-
285rl_modifying (int start, int end)-
286{-
287 if (start > end)
start > endDescription
TRUEnever evaluated
FALSEnever evaluated
0
288 {-
289 SWAP (start, end);-
290 }
never executed: end of block
0
291-
292 if (start != end)
start != endDescription
TRUEnever evaluated
FALSEnever evaluated
0
293 {-
294 char *temp = rl_copy_text (start, end);-
295 rl_begin_undo_group ();-
296 rl_add_undo (UNDO_DELETE, start, end, temp);-
297 rl_add_undo (UNDO_INSERT, start, end, (char *)NULL);-
298 rl_end_undo_group ();-
299 }
never executed: end of block
0
300 return 0;
never executed: return 0;
0
301}-
302-
303/* Revert the current line to its previous state. */-
304int-
305rl_revert_line (int count, int key)-
306{-
307 if (rl_undo_list == 0)
rl_undo_list == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
308 rl_ding ();
never executed: rl_ding ();
0
309 else-
310 {-
311 while (rl_undo_list)
rl_undo_listDescription
TRUEnever evaluated
FALSEnever evaluated
0
312 rl_do_undo ();
never executed: rl_do_undo ();
0
313#if defined (VI_MODE)-
314 if (rl_editing_mode == vi_mode)
rl_editing_mode == 0Description
TRUEnever evaluated
FALSEnever evaluated
0
315 rl_point = rl_mark = 0; /* rl_end should be set correctly */
never executed: rl_point = rl_mark = 0;
0
316#endif-
317 }
never executed: end of block
0
318 -
319 return 0;
never executed: return 0;
0
320}-
321-
322/* Do some undoing of things that were done. */-
323int-
324rl_undo_command (int count, int key)-
325{-
326 if (count < 0)
count < 0Description
TRUEnever evaluated
FALSEnever evaluated
0
327 return 0; /* Nothing to do. */
never executed: return 0;
0
328-
329 while (count)
countDescription
TRUEnever evaluated
FALSEnever evaluated
0
330 {-
331 if (rl_do_undo ())
rl_do_undo ()Description
TRUEnever evaluated
FALSEnever evaluated
0
332 count--;
never executed: count--;
0
333 else-
334 {-
335 rl_ding ();-
336 break;
never executed: break;
0
337 }-
338 }-
339 return 0;
never executed: return 0;
0
340}-
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