|
7
|
1 /* vi:set ts=8 sts=4 sw=4:
|
|
|
2 *
|
|
|
3 * VIM - Vi IMproved by Bram Moolenaar
|
|
|
4 *
|
|
|
5 * Do ":help uganda" in Vim to read copying and usage conditions.
|
|
|
6 * Do ":help credits" in Vim to see a list of people who contributed.
|
|
|
7 * See README.txt for an overview of the Vim source code.
|
|
|
8 */
|
|
|
9
|
|
|
10 /*
|
|
|
11 * undo.c: multi level undo facility
|
|
|
12 *
|
|
|
13 * The saved lines are stored in a list of lists (one for each buffer):
|
|
|
14 *
|
|
|
15 * b_u_oldhead------------------------------------------------+
|
|
|
16 * |
|
|
|
17 * V
|
|
|
18 * +--------------+ +--------------+ +--------------+
|
|
|
19 * b_u_newhead--->| u_header | | u_header | | u_header |
|
|
|
20 * | uh_next------>| uh_next------>| uh_next---->NULL
|
|
|
21 * NULL<--------uh_prev |<---------uh_prev |<---------uh_prev |
|
|
|
22 * | uh_entry | | uh_entry | | uh_entry |
|
|
|
23 * +--------|-----+ +--------|-----+ +--------|-----+
|
|
|
24 * | | |
|
|
|
25 * V V V
|
|
|
26 * +--------------+ +--------------+ +--------------+
|
|
|
27 * | u_entry | | u_entry | | u_entry |
|
|
|
28 * | ue_next | | ue_next | | ue_next |
|
|
|
29 * +--------|-----+ +--------|-----+ +--------|-----+
|
|
|
30 * | | |
|
|
|
31 * V V V
|
|
|
32 * +--------------+ NULL NULL
|
|
|
33 * | u_entry |
|
|
|
34 * | ue_next |
|
|
|
35 * +--------|-----+
|
|
|
36 * |
|
|
|
37 * V
|
|
|
38 * etc.
|
|
|
39 *
|
|
|
40 * Each u_entry list contains the information for one undo or redo.
|
|
|
41 * curbuf->b_u_curhead points to the header of the last undo (the next redo),
|
|
|
42 * or is NULL if nothing has been undone.
|
|
|
43 *
|
|
168
|
44 * All data is allocated with U_ALLOC_LINE(), it will be freed as soon as the
|
|
|
45 * buffer is unloaded.
|
|
7
|
46 */
|
|
|
47
|
|
|
48 #include "vim.h"
|
|
|
49
|
|
168
|
50 /* See below: use malloc()/free() for memory management. */
|
|
|
51 #define U_USE_MALLOC 1
|
|
|
52
|
|
7
|
53 static u_entry_T *u_get_headentry __ARGS((void));
|
|
|
54 static void u_getbot __ARGS((void));
|
|
632
|
55 static int undo_allowed __ARGS((void));
|
|
7
|
56 static int u_savecommon __ARGS((linenr_T, linenr_T, linenr_T));
|
|
|
57 static void u_doit __ARGS((int count));
|
|
|
58 static void u_undoredo __ARGS((void));
|
|
|
59 static void u_undo_end __ARGS((void));
|
|
168
|
60 static void u_freelist __ARGS((buf_T *buf, struct u_header *));
|
|
7
|
61 static void u_freeentry __ARGS((u_entry_T *, long));
|
|
|
62
|
|
168
|
63 #ifdef U_USE_MALLOC
|
|
|
64 # define U_FREE_LINE(ptr) vim_free(ptr)
|
|
|
65 # define U_ALLOC_LINE(size) lalloc((long_u)((size) + 1), FALSE)
|
|
|
66 #else
|
|
|
67 static void u_free_line __ARGS((char_u *ptr, int keep));
|
|
|
68 static char_u *u_alloc_line __ARGS((unsigned size));
|
|
|
69 # define U_FREE_LINE(ptr) u_free_line((ptr), FALSE)
|
|
|
70 # define U_ALLOC_LINE(size) u_alloc_line(size)
|
|
|
71 #endif
|
|
7
|
72 static char_u *u_save_line __ARGS((linenr_T));
|
|
|
73
|
|
|
74 static long u_newcount, u_oldcount;
|
|
|
75
|
|
|
76 /*
|
|
|
77 * When 'u' flag included in 'cpoptions', we behave like vi. Need to remember
|
|
|
78 * the action that "u" should do.
|
|
|
79 */
|
|
|
80 static int undo_undoes = FALSE;
|
|
|
81
|
|
|
82 /*
|
|
344
|
83 * Save the current line for both the "u" and "U" command.
|
|
|
84 * Returns OK or FAIL.
|
|
7
|
85 */
|
|
|
86 int
|
|
|
87 u_save_cursor()
|
|
|
88 {
|
|
|
89 return (u_save((linenr_T)(curwin->w_cursor.lnum - 1),
|
|
|
90 (linenr_T)(curwin->w_cursor.lnum + 1)));
|
|
|
91 }
|
|
|
92
|
|
|
93 /*
|
|
|
94 * Save the lines between "top" and "bot" for both the "u" and "U" command.
|
|
|
95 * "top" may be 0 and bot may be curbuf->b_ml.ml_line_count + 1.
|
|
|
96 * Returns FAIL when lines could not be saved, OK otherwise.
|
|
|
97 */
|
|
|
98 int
|
|
|
99 u_save(top, bot)
|
|
|
100 linenr_T top, bot;
|
|
|
101 {
|
|
|
102 if (undo_off)
|
|
|
103 return OK;
|
|
|
104
|
|
|
105 if (top > curbuf->b_ml.ml_line_count ||
|
|
|
106 top >= bot || bot > curbuf->b_ml.ml_line_count + 1)
|
|
|
107 return FALSE; /* rely on caller to do error messages */
|
|
|
108
|
|
|
109 if (top + 2 == bot)
|
|
|
110 u_saveline((linenr_T)(top + 1));
|
|
|
111
|
|
|
112 return (u_savecommon(top, bot, (linenr_T)0));
|
|
|
113 }
|
|
|
114
|
|
|
115 /*
|
|
|
116 * save the line "lnum" (used by ":s" and "~" command)
|
|
|
117 * The line is replaced, so the new bottom line is lnum + 1.
|
|
|
118 */
|
|
|
119 int
|
|
|
120 u_savesub(lnum)
|
|
|
121 linenr_T lnum;
|
|
|
122 {
|
|
|
123 if (undo_off)
|
|
|
124 return OK;
|
|
|
125
|
|
|
126 return (u_savecommon(lnum - 1, lnum + 1, lnum + 1));
|
|
|
127 }
|
|
|
128
|
|
|
129 /*
|
|
|
130 * a new line is inserted before line "lnum" (used by :s command)
|
|
|
131 * The line is inserted, so the new bottom line is lnum + 1.
|
|
|
132 */
|
|
|
133 int
|
|
|
134 u_inssub(lnum)
|
|
|
135 linenr_T lnum;
|
|
|
136 {
|
|
|
137 if (undo_off)
|
|
|
138 return OK;
|
|
|
139
|
|
|
140 return (u_savecommon(lnum - 1, lnum, lnum + 1));
|
|
|
141 }
|
|
|
142
|
|
|
143 /*
|
|
|
144 * save the lines "lnum" - "lnum" + nlines (used by delete command)
|
|
|
145 * The lines are deleted, so the new bottom line is lnum, unless the buffer
|
|
|
146 * becomes empty.
|
|
|
147 */
|
|
|
148 int
|
|
|
149 u_savedel(lnum, nlines)
|
|
|
150 linenr_T lnum;
|
|
|
151 long nlines;
|
|
|
152 {
|
|
|
153 if (undo_off)
|
|
|
154 return OK;
|
|
|
155
|
|
|
156 return (u_savecommon(lnum - 1, lnum + nlines,
|
|
|
157 nlines == curbuf->b_ml.ml_line_count ? 2 : lnum));
|
|
|
158 }
|
|
|
159
|
|
632
|
160 /*
|
|
|
161 * Return TRUE when undo is allowed. Otherwise give an error message and
|
|
|
162 * return FALSE.
|
|
|
163 */
|
|
|
164 static int
|
|
|
165 undo_allowed()
|
|
|
166 {
|
|
|
167 /* Don't allow changes when 'modifiable' is off. */
|
|
|
168 if (!curbuf->b_p_ma)
|
|
|
169 {
|
|
|
170 EMSG(_(e_modifiable));
|
|
|
171 return FALSE;
|
|
|
172 }
|
|
|
173
|
|
|
174 #ifdef HAVE_SANDBOX
|
|
|
175 /* In the sandbox it's not allowed to change the text. */
|
|
|
176 if (sandbox != 0)
|
|
|
177 {
|
|
|
178 EMSG(_(e_sandbox));
|
|
|
179 return FALSE;
|
|
|
180 }
|
|
|
181 #endif
|
|
|
182
|
|
|
183 /* Don't allow changes in the buffer while editing the cmdline. The
|
|
|
184 * caller of getcmdline() may get confused. */
|
|
634
|
185 if (textlock != 0)
|
|
632
|
186 {
|
|
|
187 EMSG(_(e_secure));
|
|
|
188 return FALSE;
|
|
|
189 }
|
|
|
190
|
|
|
191 return TRUE;
|
|
|
192 }
|
|
|
193
|
|
7
|
194 static int
|
|
|
195 u_savecommon(top, bot, newbot)
|
|
|
196 linenr_T top, bot;
|
|
|
197 linenr_T newbot;
|
|
|
198 {
|
|
|
199 linenr_T lnum;
|
|
|
200 long i;
|
|
|
201 struct u_header *uhp;
|
|
|
202 u_entry_T *uep;
|
|
|
203 u_entry_T *prev_uep;
|
|
|
204 long size;
|
|
|
205
|
|
632
|
206 /* When making changes is not allowed return FAIL. It's a crude way to
|
|
|
207 * make all change commands fail. */
|
|
|
208 if (!undo_allowed())
|
|
7
|
209 return FAIL;
|
|
|
210
|
|
|
211 #ifdef FEAT_NETBEANS_INTG
|
|
|
212 /*
|
|
|
213 * Netbeans defines areas that cannot be modified. Bail out here when
|
|
|
214 * trying to change text in a guarded area.
|
|
|
215 */
|
|
33
|
216 if (usingNetbeans)
|
|
7
|
217 {
|
|
33
|
218 if (netbeans_is_guarded(top, bot))
|
|
|
219 {
|
|
|
220 EMSG(_(e_guarded));
|
|
|
221 return FAIL;
|
|
|
222 }
|
|
|
223 if (curbuf->b_p_ro)
|
|
|
224 {
|
|
|
225 EMSG(_(e_nbreadonly));
|
|
|
226 return FAIL;
|
|
|
227 }
|
|
7
|
228 }
|
|
|
229 #endif
|
|
|
230
|
|
|
231 #ifdef FEAT_AUTOCMD
|
|
|
232 /*
|
|
|
233 * Saving text for undo means we are going to make a change. Give a
|
|
|
234 * warning for a read-only file before making the change, so that the
|
|
|
235 * FileChangedRO event can replace the buffer with a read-write version
|
|
|
236 * (e.g., obtained from a source control system).
|
|
|
237 */
|
|
|
238 change_warning(0);
|
|
|
239 #endif
|
|
|
240
|
|
|
241 size = bot - top - 1;
|
|
|
242
|
|
|
243 /*
|
|
|
244 * if curbuf->b_u_synced == TRUE make a new header
|
|
|
245 */
|
|
|
246 if (curbuf->b_u_synced)
|
|
|
247 {
|
|
|
248 #ifdef FEAT_JUMPLIST
|
|
|
249 /* Need to create new entry in b_changelist. */
|
|
|
250 curbuf->b_new_change = TRUE;
|
|
|
251 #endif
|
|
|
252
|
|
|
253 /*
|
|
|
254 * if we undid more than we redid, free the entry lists before and
|
|
|
255 * including curbuf->b_u_curhead
|
|
|
256 */
|
|
|
257 while (curbuf->b_u_curhead != NULL)
|
|
168
|
258 u_freelist(curbuf, curbuf->b_u_newhead);
|
|
7
|
259
|
|
|
260 /*
|
|
|
261 * free headers to keep the size right
|
|
|
262 */
|
|
|
263 while (curbuf->b_u_numhead > p_ul && curbuf->b_u_oldhead != NULL)
|
|
168
|
264 u_freelist(curbuf, curbuf->b_u_oldhead);
|
|
7
|
265
|
|
|
266 if (p_ul < 0) /* no undo at all */
|
|
|
267 {
|
|
|
268 curbuf->b_u_synced = FALSE;
|
|
|
269 return OK;
|
|
|
270 }
|
|
|
271
|
|
|
272 /*
|
|
|
273 * make a new header entry
|
|
|
274 */
|
|
168
|
275 uhp = (struct u_header *)U_ALLOC_LINE((unsigned)
|
|
7
|
276 sizeof(struct u_header));
|
|
|
277 if (uhp == NULL)
|
|
|
278 goto nomem;
|
|
|
279 uhp->uh_prev = NULL;
|
|
|
280 uhp->uh_next = curbuf->b_u_newhead;
|
|
|
281 if (curbuf->b_u_newhead != NULL)
|
|
|
282 curbuf->b_u_newhead->uh_prev = uhp;
|
|
|
283 uhp->uh_entry = NULL;
|
|
|
284 uhp->uh_getbot_entry = NULL;
|
|
|
285 uhp->uh_cursor = curwin->w_cursor; /* save cursor pos. for undo */
|
|
|
286 #ifdef FEAT_VIRTUALEDIT
|
|
|
287 if (virtual_active() && curwin->w_cursor.coladd > 0)
|
|
|
288 uhp->uh_cursor_vcol = getviscol();
|
|
|
289 else
|
|
|
290 uhp->uh_cursor_vcol = -1;
|
|
|
291 #endif
|
|
|
292
|
|
|
293 /* save changed and buffer empty flag for undo */
|
|
|
294 uhp->uh_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
|
|
|
295 ((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
|
|
|
296
|
|
|
297 /* save named marks for undo */
|
|
|
298 mch_memmove(uhp->uh_namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
|
|
|
299 curbuf->b_u_newhead = uhp;
|
|
|
300 if (curbuf->b_u_oldhead == NULL)
|
|
|
301 curbuf->b_u_oldhead = uhp;
|
|
|
302 ++curbuf->b_u_numhead;
|
|
|
303 }
|
|
|
304 else
|
|
|
305 {
|
|
|
306 if (p_ul < 0) /* no undo at all */
|
|
|
307 return OK;
|
|
|
308
|
|
|
309 /*
|
|
|
310 * When saving a single line, and it has been saved just before, it
|
|
|
311 * doesn't make sense saving it again. Saves a lot of memory when
|
|
|
312 * making lots of changes inside the same line.
|
|
|
313 * This is only possible if the previous change didn't increase or
|
|
|
314 * decrease the number of lines.
|
|
|
315 * Check the ten last changes. More doesn't make sense and takes too
|
|
|
316 * long.
|
|
|
317 */
|
|
|
318 if (size == 1)
|
|
|
319 {
|
|
|
320 uep = u_get_headentry();
|
|
|
321 prev_uep = NULL;
|
|
|
322 for (i = 0; i < 10; ++i)
|
|
|
323 {
|
|
|
324 if (uep == NULL)
|
|
|
325 break;
|
|
|
326
|
|
|
327 /* If lines have been inserted/deleted we give up.
|
|
|
328 * Also when the line was included in a multi-line save. */
|
|
|
329 if ((curbuf->b_u_newhead->uh_getbot_entry != uep
|
|
|
330 ? (uep->ue_top + uep->ue_size + 1
|
|
|
331 != (uep->ue_bot == 0
|
|
|
332 ? curbuf->b_ml.ml_line_count + 1
|
|
|
333 : uep->ue_bot))
|
|
|
334 : uep->ue_lcount != curbuf->b_ml.ml_line_count)
|
|
|
335 || (uep->ue_size > 1
|
|
|
336 && top >= uep->ue_top
|
|
|
337 && top + 2 <= uep->ue_top + uep->ue_size + 1))
|
|
|
338 break;
|
|
|
339
|
|
|
340 /* If it's the same line we can skip saving it again. */
|
|
|
341 if (uep->ue_size == 1 && uep->ue_top == top)
|
|
|
342 {
|
|
|
343 if (i > 0)
|
|
|
344 {
|
|
|
345 /* It's not the last entry: get ue_bot for the last
|
|
|
346 * entry now. Following deleted/inserted lines go to
|
|
|
347 * the re-used entry. */
|
|
|
348 u_getbot();
|
|
|
349 curbuf->b_u_synced = FALSE;
|
|
|
350
|
|
|
351 /* Move the found entry to become the last entry. The
|
|
|
352 * order of undo/redo doesn't matter for the entries
|
|
|
353 * we move it over, since they don't change the line
|
|
|
354 * count and don't include this line. It does matter
|
|
|
355 * for the found entry if the line count is changed by
|
|
|
356 * the executed command. */
|
|
|
357 prev_uep->ue_next = uep->ue_next;
|
|
|
358 uep->ue_next = curbuf->b_u_newhead->uh_entry;
|
|
|
359 curbuf->b_u_newhead->uh_entry = uep;
|
|
|
360 }
|
|
|
361
|
|
|
362 /* The executed command may change the line count. */
|
|
|
363 if (newbot != 0)
|
|
|
364 uep->ue_bot = newbot;
|
|
|
365 else if (bot > curbuf->b_ml.ml_line_count)
|
|
|
366 uep->ue_bot = 0;
|
|
|
367 else
|
|
|
368 {
|
|
|
369 uep->ue_lcount = curbuf->b_ml.ml_line_count;
|
|
|
370 curbuf->b_u_newhead->uh_getbot_entry = uep;
|
|
|
371 }
|
|
|
372 return OK;
|
|
|
373 }
|
|
|
374 prev_uep = uep;
|
|
|
375 uep = uep->ue_next;
|
|
|
376 }
|
|
|
377 }
|
|
|
378
|
|
|
379 /* find line number for ue_bot for previous u_save() */
|
|
|
380 u_getbot();
|
|
|
381 }
|
|
|
382
|
|
|
383 #if !defined(UNIX) && !defined(DJGPP) && !defined(WIN32) && !defined(__EMX__)
|
|
|
384 /*
|
|
|
385 * With Amiga and MSDOS 16 bit we can't handle big undo's, because
|
|
|
386 * then u_alloc_line would have to allocate a block larger than 32K
|
|
|
387 */
|
|
|
388 if (size >= 8000)
|
|
|
389 goto nomem;
|
|
|
390 #endif
|
|
|
391
|
|
|
392 /*
|
|
|
393 * add lines in front of entry list
|
|
|
394 */
|
|
168
|
395 uep = (u_entry_T *)U_ALLOC_LINE((unsigned)sizeof(u_entry_T));
|
|
7
|
396 if (uep == NULL)
|
|
|
397 goto nomem;
|
|
|
398
|
|
|
399 uep->ue_size = size;
|
|
|
400 uep->ue_top = top;
|
|
|
401 if (newbot != 0)
|
|
|
402 uep->ue_bot = newbot;
|
|
|
403 /*
|
|
|
404 * Use 0 for ue_bot if bot is below last line.
|
|
|
405 * Otherwise we have to compute ue_bot later.
|
|
|
406 */
|
|
|
407 else if (bot > curbuf->b_ml.ml_line_count)
|
|
|
408 uep->ue_bot = 0;
|
|
|
409 else
|
|
|
410 {
|
|
|
411 uep->ue_lcount = curbuf->b_ml.ml_line_count;
|
|
|
412 curbuf->b_u_newhead->uh_getbot_entry = uep;
|
|
|
413 }
|
|
|
414
|
|
168
|
415 if (size > 0)
|
|
7
|
416 {
|
|
168
|
417 if ((uep->ue_array = (char_u **)U_ALLOC_LINE(
|
|
7
|
418 (unsigned)(sizeof(char_u *) * size))) == NULL)
|
|
|
419 {
|
|
|
420 u_freeentry(uep, 0L);
|
|
|
421 goto nomem;
|
|
|
422 }
|
|
|
423 for (i = 0, lnum = top + 1; i < size; ++i)
|
|
|
424 {
|
|
481
|
425 fast_breakcheck();
|
|
|
426 if (got_int)
|
|
|
427 {
|
|
|
428 u_freeentry(uep, i);
|
|
|
429 return FAIL;
|
|
|
430 }
|
|
7
|
431 if ((uep->ue_array[i] = u_save_line(lnum++)) == NULL)
|
|
|
432 {
|
|
|
433 u_freeentry(uep, i);
|
|
|
434 goto nomem;
|
|
|
435 }
|
|
|
436 }
|
|
|
437 }
|
|
359
|
438 else
|
|
|
439 uep->ue_array = NULL;
|
|
7
|
440 uep->ue_next = curbuf->b_u_newhead->uh_entry;
|
|
|
441 curbuf->b_u_newhead->uh_entry = uep;
|
|
|
442 curbuf->b_u_synced = FALSE;
|
|
|
443 undo_undoes = FALSE;
|
|
|
444
|
|
|
445 return OK;
|
|
|
446
|
|
|
447 nomem:
|
|
|
448 msg_silent = 0; /* must display the prompt */
|
|
|
449 if (ask_yesno((char_u *)_("No undo possible; continue anyway"), TRUE)
|
|
|
450 == 'y')
|
|
|
451 {
|
|
|
452 undo_off = TRUE; /* will be reset when character typed */
|
|
|
453 return OK;
|
|
|
454 }
|
|
|
455 do_outofmem_msg((long_u)0);
|
|
|
456 return FAIL;
|
|
|
457 }
|
|
|
458
|
|
|
459 /*
|
|
|
460 * If 'cpoptions' contains 'u': Undo the previous undo or redo (vi compatible).
|
|
|
461 * If 'cpoptions' does not contain 'u': Always undo.
|
|
|
462 */
|
|
|
463 void
|
|
|
464 u_undo(count)
|
|
|
465 int count;
|
|
|
466 {
|
|
|
467 /*
|
|
|
468 * If we get an undo command while executing a macro, we behave like the
|
|
|
469 * original vi. If this happens twice in one macro the result will not
|
|
|
470 * be compatible.
|
|
|
471 */
|
|
|
472 if (curbuf->b_u_synced == FALSE)
|
|
|
473 {
|
|
|
474 u_sync();
|
|
|
475 count = 1;
|
|
|
476 }
|
|
|
477
|
|
|
478 if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
|
|
|
479 undo_undoes = TRUE;
|
|
|
480 else
|
|
|
481 undo_undoes = !undo_undoes;
|
|
|
482 u_doit(count);
|
|
|
483 }
|
|
|
484
|
|
|
485 /*
|
|
|
486 * If 'cpoptions' contains 'u': Repeat the previous undo or redo.
|
|
|
487 * If 'cpoptions' does not contain 'u': Always redo.
|
|
|
488 */
|
|
|
489 void
|
|
|
490 u_redo(count)
|
|
|
491 int count;
|
|
|
492 {
|
|
|
493 if (vim_strchr(p_cpo, CPO_UNDO) == NULL)
|
|
|
494 undo_undoes = FALSE;
|
|
|
495 u_doit(count);
|
|
|
496 }
|
|
|
497
|
|
|
498 /*
|
|
|
499 * Undo or redo, depending on 'undo_undoes', 'count' times.
|
|
|
500 */
|
|
|
501 static void
|
|
|
502 u_doit(count)
|
|
|
503 int count;
|
|
|
504 {
|
|
632
|
505 if (!undo_allowed())
|
|
7
|
506 return;
|
|
|
507
|
|
|
508 u_newcount = 0;
|
|
|
509 u_oldcount = 0;
|
|
179
|
510 if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
|
511 u_oldcount = -1;
|
|
7
|
512 while (count--)
|
|
|
513 {
|
|
|
514 if (undo_undoes)
|
|
|
515 {
|
|
|
516 if (curbuf->b_u_curhead == NULL) /* first undo */
|
|
|
517 curbuf->b_u_curhead = curbuf->b_u_newhead;
|
|
|
518 else if (p_ul > 0) /* multi level undo */
|
|
|
519 /* get next undo */
|
|
|
520 curbuf->b_u_curhead = curbuf->b_u_curhead->uh_next;
|
|
|
521 /* nothing to undo */
|
|
|
522 if (curbuf->b_u_numhead == 0 || curbuf->b_u_curhead == NULL)
|
|
|
523 {
|
|
|
524 /* stick curbuf->b_u_curhead at end */
|
|
|
525 curbuf->b_u_curhead = curbuf->b_u_oldhead;
|
|
|
526 beep_flush();
|
|
|
527 break;
|
|
|
528 }
|
|
|
529
|
|
|
530 u_undoredo();
|
|
|
531 }
|
|
|
532 else
|
|
|
533 {
|
|
|
534 if (curbuf->b_u_curhead == NULL || p_ul <= 0)
|
|
|
535 {
|
|
|
536 beep_flush(); /* nothing to redo */
|
|
|
537 break;
|
|
|
538 }
|
|
|
539
|
|
|
540 u_undoredo();
|
|
|
541 /* advance for next redo */
|
|
|
542 curbuf->b_u_curhead = curbuf->b_u_curhead->uh_prev;
|
|
|
543 }
|
|
|
544 }
|
|
179
|
545 if (curbuf->b_ml.ml_flags & ML_EMPTY)
|
|
|
546 --u_newcount;
|
|
7
|
547 u_undo_end();
|
|
|
548 }
|
|
|
549
|
|
|
550 /*
|
|
|
551 * u_undoredo: common code for undo and redo
|
|
|
552 *
|
|
|
553 * The lines in the file are replaced by the lines in the entry list at
|
|
|
554 * curbuf->b_u_curhead. The replaced lines in the file are saved in the entry
|
|
|
555 * list for the next undo/redo.
|
|
|
556 */
|
|
|
557 static void
|
|
|
558 u_undoredo()
|
|
|
559 {
|
|
|
560 char_u **newarray = NULL;
|
|
|
561 linenr_T oldsize;
|
|
|
562 linenr_T newsize;
|
|
|
563 linenr_T top, bot;
|
|
|
564 linenr_T lnum;
|
|
|
565 linenr_T newlnum = MAXLNUM;
|
|
|
566 long i;
|
|
|
567 u_entry_T *uep, *nuep;
|
|
|
568 u_entry_T *newlist = NULL;
|
|
|
569 int old_flags;
|
|
|
570 int new_flags;
|
|
|
571 pos_T namedm[NMARKS];
|
|
|
572 int empty_buffer; /* buffer became empty */
|
|
|
573
|
|
|
574 old_flags = curbuf->b_u_curhead->uh_flags;
|
|
|
575 new_flags = (curbuf->b_changed ? UH_CHANGED : 0) +
|
|
|
576 ((curbuf->b_ml.ml_flags & ML_EMPTY) ? UH_EMPTYBUF : 0);
|
|
|
577 setpcmark();
|
|
|
578
|
|
|
579 /*
|
|
|
580 * save marks before undo/redo
|
|
|
581 */
|
|
|
582 mch_memmove(namedm, curbuf->b_namedm, sizeof(pos_T) * NMARKS);
|
|
|
583 curbuf->b_op_start.lnum = curbuf->b_ml.ml_line_count;
|
|
|
584 curbuf->b_op_start.col = 0;
|
|
|
585 curbuf->b_op_end.lnum = 0;
|
|
|
586 curbuf->b_op_end.col = 0;
|
|
|
587
|
|
|
588 for (uep = curbuf->b_u_curhead->uh_entry; uep != NULL; uep = nuep)
|
|
|
589 {
|
|
|
590 top = uep->ue_top;
|
|
|
591 bot = uep->ue_bot;
|
|
|
592 if (bot == 0)
|
|
|
593 bot = curbuf->b_ml.ml_line_count + 1;
|
|
|
594 if (top > curbuf->b_ml.ml_line_count || top >= bot
|
|
|
595 || bot > curbuf->b_ml.ml_line_count + 1)
|
|
|
596 {
|
|
|
597 EMSG(_("E438: u_undo: line numbers wrong"));
|
|
|
598 changed(); /* don't want UNCHANGED now */
|
|
|
599 return;
|
|
|
600 }
|
|
|
601
|
|
|
602 oldsize = bot - top - 1; /* number of lines before undo */
|
|
|
603 newsize = uep->ue_size; /* number of lines after undo */
|
|
|
604
|
|
|
605 if (top < newlnum)
|
|
|
606 {
|
|
|
607 /* If the saved cursor is somewhere in this undo block, move it to
|
|
|
608 * the remembered position. Makes "gwap" put the cursor back
|
|
|
609 * where it was. */
|
|
|
610 lnum = curbuf->b_u_curhead->uh_cursor.lnum;
|
|
|
611 if (lnum >= top && lnum <= top + newsize + 1)
|
|
|
612 {
|
|
|
613 curwin->w_cursor = curbuf->b_u_curhead->uh_cursor;
|
|
|
614 newlnum = curwin->w_cursor.lnum - 1;
|
|
|
615 }
|
|
|
616 else
|
|
|
617 {
|
|
|
618 /* Use the first line that actually changed. Avoids that
|
|
|
619 * undoing auto-formatting puts the cursor in the previous
|
|
|
620 * line. */
|
|
|
621 for (i = 0; i < newsize && i < oldsize; ++i)
|
|
|
622 if (STRCMP(uep->ue_array[i], ml_get(top + 1 + i)) != 0)
|
|
|
623 break;
|
|
|
624 if (i == newsize && newlnum == MAXLNUM && uep->ue_next == NULL)
|
|
|
625 {
|
|
|
626 newlnum = top;
|
|
|
627 curwin->w_cursor.lnum = newlnum + 1;
|
|
|
628 }
|
|
|
629 else if (i < newsize)
|
|
|
630 {
|
|
|
631 newlnum = top + i;
|
|
|
632 curwin->w_cursor.lnum = newlnum + 1;
|
|
|
633 }
|
|
|
634 }
|
|
|
635 }
|
|
|
636
|
|
|
637 empty_buffer = FALSE;
|
|
|
638
|
|
|
639 /* delete the lines between top and bot and save them in newarray */
|
|
168
|
640 if (oldsize > 0)
|
|
7
|
641 {
|
|
168
|
642 if ((newarray = (char_u **)U_ALLOC_LINE(
|
|
7
|
643 (unsigned)(sizeof(char_u *) * oldsize))) == NULL)
|
|
|
644 {
|
|
|
645 do_outofmem_msg((long_u)(sizeof(char_u *) * oldsize));
|
|
|
646 /*
|
|
|
647 * We have messed up the entry list, repair is impossible.
|
|
|
648 * we have to free the rest of the list.
|
|
|
649 */
|
|
|
650 while (uep != NULL)
|
|
|
651 {
|
|
|
652 nuep = uep->ue_next;
|
|
|
653 u_freeentry(uep, uep->ue_size);
|
|
|
654 uep = nuep;
|
|
|
655 }
|
|
|
656 break;
|
|
|
657 }
|
|
|
658 /* delete backwards, it goes faster in most cases */
|
|
|
659 for (lnum = bot - 1, i = oldsize; --i >= 0; --lnum)
|
|
|
660 {
|
|
|
661 /* what can we do when we run out of memory? */
|
|
|
662 if ((newarray[i] = u_save_line(lnum)) == NULL)
|
|
|
663 do_outofmem_msg((long_u)0);
|
|
|
664 /* remember we deleted the last line in the buffer, and a
|
|
|
665 * dummy empty line will be inserted */
|
|
|
666 if (curbuf->b_ml.ml_line_count == 1)
|
|
|
667 empty_buffer = TRUE;
|
|
|
668 ml_delete(lnum, FALSE);
|
|
|
669 }
|
|
|
670 }
|
|
414
|
671 else
|
|
|
672 newarray = NULL;
|
|
7
|
673
|
|
|
674 /* insert the lines in u_array between top and bot */
|
|
|
675 if (newsize)
|
|
|
676 {
|
|
|
677 for (lnum = top, i = 0; i < newsize; ++i, ++lnum)
|
|
|
678 {
|
|
|
679 /*
|
|
|
680 * If the file is empty, there is an empty line 1 that we
|
|
|
681 * should get rid of, by replacing it with the new line
|
|
|
682 */
|
|
|
683 if (empty_buffer && lnum == 0)
|
|
|
684 ml_replace((linenr_T)1, uep->ue_array[i], TRUE);
|
|
|
685 else
|
|
|
686 ml_append(lnum, uep->ue_array[i], (colnr_T)0, FALSE);
|
|
168
|
687 U_FREE_LINE(uep->ue_array[i]);
|
|
7
|
688 }
|
|
168
|
689 U_FREE_LINE((char_u *)uep->ue_array);
|
|
7
|
690 }
|
|
|
691
|
|
|
692 /* adjust marks */
|
|
|
693 if (oldsize != newsize)
|
|
|
694 {
|
|
|
695 mark_adjust(top + 1, top + oldsize, (long)MAXLNUM,
|
|
|
696 (long)newsize - (long)oldsize);
|
|
|
697 if (curbuf->b_op_start.lnum > top + oldsize)
|
|
|
698 curbuf->b_op_start.lnum += newsize - oldsize;
|
|
|
699 if (curbuf->b_op_end.lnum > top + oldsize)
|
|
|
700 curbuf->b_op_end.lnum += newsize - oldsize;
|
|
|
701 }
|
|
|
702
|
|
|
703 changed_lines(top + 1, 0, bot, newsize - oldsize);
|
|
|
704
|
|
|
705 /* set '[ and '] mark */
|
|
|
706 if (top + 1 < curbuf->b_op_start.lnum)
|
|
|
707 curbuf->b_op_start.lnum = top + 1;
|
|
|
708 if (newsize == 0 && top + 1 > curbuf->b_op_end.lnum)
|
|
|
709 curbuf->b_op_end.lnum = top + 1;
|
|
|
710 else if (top + newsize > curbuf->b_op_end.lnum)
|
|
|
711 curbuf->b_op_end.lnum = top + newsize;
|
|
|
712
|
|
|
713 u_newcount += newsize;
|
|
|
714 u_oldcount += oldsize;
|
|
|
715 uep->ue_size = oldsize;
|
|
|
716 uep->ue_array = newarray;
|
|
|
717 uep->ue_bot = top + newsize + 1;
|
|
|
718
|
|
|
719 /*
|
|
|
720 * insert this entry in front of the new entry list
|
|
|
721 */
|
|
|
722 nuep = uep->ue_next;
|
|
|
723 uep->ue_next = newlist;
|
|
|
724 newlist = uep;
|
|
|
725 }
|
|
|
726
|
|
|
727 curbuf->b_u_curhead->uh_entry = newlist;
|
|
|
728 curbuf->b_u_curhead->uh_flags = new_flags;
|
|
|
729 if ((old_flags & UH_EMPTYBUF) && bufempty())
|
|
|
730 curbuf->b_ml.ml_flags |= ML_EMPTY;
|
|
|
731 if (old_flags & UH_CHANGED)
|
|
|
732 changed();
|
|
|
733 else
|
|
33
|
734 #ifdef FEAT_NETBEANS_INTG
|
|
|
735 /* per netbeans undo rules, keep it as modified */
|
|
|
736 if (!isNetbeansModified(curbuf))
|
|
|
737 #endif
|
|
7
|
738 unchanged(curbuf, FALSE);
|
|
|
739
|
|
|
740 /*
|
|
|
741 * restore marks from before undo/redo
|
|
|
742 */
|
|
|
743 for (i = 0; i < NMARKS; ++i)
|
|
|
744 if (curbuf->b_u_curhead->uh_namedm[i].lnum)
|
|
|
745 {
|
|
|
746 curbuf->b_namedm[i] = curbuf->b_u_curhead->uh_namedm[i];
|
|
|
747 curbuf->b_u_curhead->uh_namedm[i] = namedm[i];
|
|
|
748 }
|
|
|
749
|
|
|
750 /*
|
|
|
751 * If the cursor is only off by one line, put it at the same position as
|
|
|
752 * before starting the change (for the "o" command).
|
|
|
753 * Otherwise the cursor should go to the first undone line.
|
|
|
754 */
|
|
|
755 if (curbuf->b_u_curhead->uh_cursor.lnum + 1 == curwin->w_cursor.lnum
|
|
|
756 && curwin->w_cursor.lnum > 1)
|
|
|
757 --curwin->w_cursor.lnum;
|
|
|
758 if (curbuf->b_u_curhead->uh_cursor.lnum == curwin->w_cursor.lnum)
|
|
|
759 {
|
|
|
760 curwin->w_cursor.col = curbuf->b_u_curhead->uh_cursor.col;
|
|
|
761 #ifdef FEAT_VIRTUALEDIT
|
|
|
762 if (virtual_active() && curbuf->b_u_curhead->uh_cursor_vcol >= 0)
|
|
|
763 coladvance((colnr_T)curbuf->b_u_curhead->uh_cursor_vcol);
|
|
|
764 else
|
|
|
765 curwin->w_cursor.coladd = 0;
|
|
|
766 #endif
|
|
|
767 }
|
|
|
768 else if (curwin->w_cursor.lnum <= curbuf->b_ml.ml_line_count)
|
|
|
769 beginline(BL_SOL | BL_FIX);
|
|
|
770 else
|
|
|
771 {
|
|
|
772 /* We get here with the current cursor line being past the end (eg
|
|
|
773 * after adding lines at the end of the file, and then undoing it).
|
|
|
774 * check_cursor() will move the cursor to the last line. Move it to
|
|
|
775 * the first column here. */
|
|
|
776 curwin->w_cursor.col = 0;
|
|
|
777 #ifdef FEAT_VIRTUALEDIT
|
|
|
778 curwin->w_cursor.coladd = 0;
|
|
|
779 #endif
|
|
|
780 }
|
|
|
781
|
|
|
782 /* Make sure the cursor is on an existing line and column. */
|
|
|
783 check_cursor();
|
|
|
784 }
|
|
|
785
|
|
|
786 /*
|
|
|
787 * If we deleted or added lines, report the number of less/more lines.
|
|
|
788 * Otherwise, report the number of changes (this may be incorrect
|
|
|
789 * in some cases, but it's better than nothing).
|
|
|
790 */
|
|
|
791 static void
|
|
|
792 u_undo_end()
|
|
|
793 {
|
|
|
794 if ((u_oldcount -= u_newcount) != 0)
|
|
|
795 msgmore(-u_oldcount);
|
|
|
796 else if (u_newcount > p_report)
|
|
|
797 {
|
|
|
798 if (u_newcount == 1)
|
|
|
799 MSG(_("1 change"));
|
|
|
800 else
|
|
|
801 smsg((char_u *)_("%ld changes"), u_newcount);
|
|
|
802 }
|
|
|
803 #ifdef FEAT_FOLDING
|
|
|
804 if ((fdo_flags & FDO_UNDO) && KeyTyped)
|
|
|
805 foldOpenCursor();
|
|
|
806 #endif
|
|
|
807 }
|
|
|
808
|
|
|
809 /*
|
|
|
810 * u_sync: stop adding to the current entry list
|
|
|
811 */
|
|
|
812 void
|
|
|
813 u_sync()
|
|
|
814 {
|
|
|
815 if (curbuf->b_u_synced)
|
|
|
816 return; /* already synced */
|
|
|
817 #if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
|
|
|
818 if (im_is_preediting())
|
|
|
819 return; /* XIM is busy, don't break an undo sequence */
|
|
|
820 #endif
|
|
|
821 if (p_ul < 0)
|
|
|
822 curbuf->b_u_synced = TRUE; /* no entries, nothing to do */
|
|
|
823 else
|
|
|
824 {
|
|
|
825 u_getbot(); /* compute ue_bot of previous u_save */
|
|
|
826 curbuf->b_u_curhead = NULL;
|
|
|
827 }
|
|
|
828 }
|
|
|
829
|
|
|
830 /*
|
|
|
831 * Called after writing the file and setting b_changed to FALSE.
|
|
|
832 * Now an undo means that the buffer is modified.
|
|
|
833 */
|
|
|
834 void
|
|
|
835 u_unchanged(buf)
|
|
|
836 buf_T *buf;
|
|
|
837 {
|
|
|
838 struct u_header *uh;
|
|
|
839
|
|
|
840 for (uh = buf->b_u_newhead; uh; uh = uh->uh_next)
|
|
|
841 uh->uh_flags |= UH_CHANGED;
|
|
|
842 buf->b_did_warn = FALSE;
|
|
|
843 }
|
|
|
844
|
|
|
845 /*
|
|
|
846 * Get pointer to last added entry.
|
|
|
847 * If it's not valid, give an error message and return NULL.
|
|
|
848 */
|
|
|
849 static u_entry_T *
|
|
|
850 u_get_headentry()
|
|
|
851 {
|
|
|
852 if (curbuf->b_u_newhead == NULL || curbuf->b_u_newhead->uh_entry == NULL)
|
|
|
853 {
|
|
|
854 EMSG(_("E439: undo list corrupt"));
|
|
|
855 return NULL;
|
|
|
856 }
|
|
|
857 return curbuf->b_u_newhead->uh_entry;
|
|
|
858 }
|
|
|
859
|
|
|
860 /*
|
|
|
861 * u_getbot(): compute the line number of the previous u_save
|
|
|
862 * It is called only when b_u_synced is FALSE.
|
|
|
863 */
|
|
|
864 static void
|
|
|
865 u_getbot()
|
|
|
866 {
|
|
|
867 u_entry_T *uep;
|
|
|
868 linenr_T extra;
|
|
|
869
|
|
|
870 uep = u_get_headentry(); /* check for corrupt undo list */
|
|
|
871 if (uep == NULL)
|
|
|
872 return;
|
|
|
873
|
|
|
874 uep = curbuf->b_u_newhead->uh_getbot_entry;
|
|
|
875 if (uep != NULL)
|
|
|
876 {
|
|
|
877 /*
|
|
|
878 * the new ue_bot is computed from the number of lines that has been
|
|
|
879 * inserted (0 - deleted) since calling u_save. This is equal to the
|
|
|
880 * old line count subtracted from the current line count.
|
|
|
881 */
|
|
|
882 extra = curbuf->b_ml.ml_line_count - uep->ue_lcount;
|
|
|
883 uep->ue_bot = uep->ue_top + uep->ue_size + 1 + extra;
|
|
|
884 if (uep->ue_bot < 1 || uep->ue_bot > curbuf->b_ml.ml_line_count)
|
|
|
885 {
|
|
|
886 EMSG(_("E440: undo line missing"));
|
|
|
887 uep->ue_bot = uep->ue_top + 1; /* assume all lines deleted, will
|
|
|
888 * get all the old lines back
|
|
|
889 * without deleting the current
|
|
|
890 * ones */
|
|
|
891 }
|
|
|
892
|
|
|
893 curbuf->b_u_newhead->uh_getbot_entry = NULL;
|
|
|
894 }
|
|
|
895
|
|
|
896 curbuf->b_u_synced = TRUE;
|
|
|
897 }
|
|
|
898
|
|
|
899 /*
|
|
|
900 * u_freelist: free one entry list and adjust the pointers
|
|
|
901 */
|
|
|
902 static void
|
|
168
|
903 u_freelist(buf, uhp)
|
|
|
904 buf_T *buf;
|
|
7
|
905 struct u_header *uhp;
|
|
|
906 {
|
|
|
907 u_entry_T *uep, *nuep;
|
|
|
908
|
|
|
909 for (uep = uhp->uh_entry; uep != NULL; uep = nuep)
|
|
|
910 {
|
|
|
911 nuep = uep->ue_next;
|
|
|
912 u_freeentry(uep, uep->ue_size);
|
|
|
913 }
|
|
|
914
|
|
168
|
915 if (buf->b_u_curhead == uhp)
|
|
|
916 buf->b_u_curhead = NULL;
|
|
7
|
917
|
|
|
918 if (uhp->uh_next == NULL)
|
|
168
|
919 buf->b_u_oldhead = uhp->uh_prev;
|
|
7
|
920 else
|
|
|
921 uhp->uh_next->uh_prev = uhp->uh_prev;
|
|
|
922
|
|
|
923 if (uhp->uh_prev == NULL)
|
|
168
|
924 buf->b_u_newhead = uhp->uh_next;
|
|
7
|
925 else
|
|
|
926 uhp->uh_prev->uh_next = uhp->uh_next;
|
|
|
927
|
|
168
|
928 U_FREE_LINE((char_u *)uhp);
|
|
|
929 --buf->b_u_numhead;
|
|
7
|
930 }
|
|
|
931
|
|
|
932 /*
|
|
|
933 * free entry 'uep' and 'n' lines in uep->ue_array[]
|
|
|
934 */
|
|
|
935 static void
|
|
|
936 u_freeentry(uep, n)
|
|
|
937 u_entry_T *uep;
|
|
|
938 long n;
|
|
|
939 {
|
|
414
|
940 while (n > 0)
|
|
168
|
941 U_FREE_LINE(uep->ue_array[--n]);
|
|
359
|
942 U_FREE_LINE((char_u *)uep->ue_array);
|
|
168
|
943 U_FREE_LINE((char_u *)uep);
|
|
7
|
944 }
|
|
|
945
|
|
|
946 /*
|
|
|
947 * invalidate the undo buffer; called when storage has already been released
|
|
|
948 */
|
|
|
949 void
|
|
|
950 u_clearall(buf)
|
|
|
951 buf_T *buf;
|
|
|
952 {
|
|
|
953 buf->b_u_newhead = buf->b_u_oldhead = buf->b_u_curhead = NULL;
|
|
|
954 buf->b_u_synced = TRUE;
|
|
|
955 buf->b_u_numhead = 0;
|
|
|
956 buf->b_u_line_ptr = NULL;
|
|
|
957 buf->b_u_line_lnum = 0;
|
|
|
958 }
|
|
|
959
|
|
|
960 /*
|
|
|
961 * save the line "lnum" for the "U" command
|
|
|
962 */
|
|
|
963 void
|
|
|
964 u_saveline(lnum)
|
|
|
965 linenr_T lnum;
|
|
|
966 {
|
|
|
967 if (lnum == curbuf->b_u_line_lnum) /* line is already saved */
|
|
|
968 return;
|
|
356
|
969 if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count) /* should never happen */
|
|
7
|
970 return;
|
|
|
971 u_clearline();
|
|
|
972 curbuf->b_u_line_lnum = lnum;
|
|
|
973 if (curwin->w_cursor.lnum == lnum)
|
|
|
974 curbuf->b_u_line_colnr = curwin->w_cursor.col;
|
|
|
975 else
|
|
|
976 curbuf->b_u_line_colnr = 0;
|
|
|
977 if ((curbuf->b_u_line_ptr = u_save_line(lnum)) == NULL)
|
|
|
978 do_outofmem_msg((long_u)0);
|
|
|
979 }
|
|
|
980
|
|
|
981 /*
|
|
|
982 * clear the line saved for the "U" command
|
|
|
983 * (this is used externally for crossing a line while in insert mode)
|
|
|
984 */
|
|
|
985 void
|
|
|
986 u_clearline()
|
|
|
987 {
|
|
|
988 if (curbuf->b_u_line_ptr != NULL)
|
|
|
989 {
|
|
168
|
990 U_FREE_LINE(curbuf->b_u_line_ptr);
|
|
7
|
991 curbuf->b_u_line_ptr = NULL;
|
|
|
992 curbuf->b_u_line_lnum = 0;
|
|
|
993 }
|
|
|
994 }
|
|
|
995
|
|
|
996 /*
|
|
|
997 * Implementation of the "U" command.
|
|
|
998 * Differentiation from vi: "U" can be undone with the next "U".
|
|
|
999 * We also allow the cursor to be in another line.
|
|
|
1000 */
|
|
|
1001 void
|
|
|
1002 u_undoline()
|
|
|
1003 {
|
|
|
1004 colnr_T t;
|
|
|
1005 char_u *oldp;
|
|
|
1006
|
|
|
1007 if (undo_off)
|
|
|
1008 return;
|
|
|
1009
|
|
|
1010 if (curbuf->b_u_line_ptr == NULL ||
|
|
|
1011 curbuf->b_u_line_lnum > curbuf->b_ml.ml_line_count)
|
|
|
1012 {
|
|
|
1013 beep_flush();
|
|
|
1014 return;
|
|
|
1015 }
|
|
|
1016 /* first save the line for the 'u' command */
|
|
|
1017 if (u_savecommon(curbuf->b_u_line_lnum - 1,
|
|
|
1018 curbuf->b_u_line_lnum + 1, (linenr_T)0) == FAIL)
|
|
|
1019 return;
|
|
|
1020 oldp = u_save_line(curbuf->b_u_line_lnum);
|
|
|
1021 if (oldp == NULL)
|
|
|
1022 {
|
|
|
1023 do_outofmem_msg((long_u)0);
|
|
|
1024 return;
|
|
|
1025 }
|
|
|
1026 ml_replace(curbuf->b_u_line_lnum, curbuf->b_u_line_ptr, TRUE);
|
|
|
1027 changed_bytes(curbuf->b_u_line_lnum, 0);
|
|
168
|
1028 U_FREE_LINE(curbuf->b_u_line_ptr);
|
|
7
|
1029 curbuf->b_u_line_ptr = oldp;
|
|
|
1030
|
|
|
1031 t = curbuf->b_u_line_colnr;
|
|
|
1032 if (curwin->w_cursor.lnum == curbuf->b_u_line_lnum)
|
|
|
1033 curbuf->b_u_line_colnr = curwin->w_cursor.col;
|
|
|
1034 curwin->w_cursor.col = t;
|
|
|
1035 curwin->w_cursor.lnum = curbuf->b_u_line_lnum;
|
|
|
1036 }
|
|
|
1037
|
|
|
1038 /*
|
|
168
|
1039 * There are two implementations of the memory management for undo:
|
|
|
1040 * 1. Use the standard malloc()/free() functions.
|
|
|
1041 * This should be fast for allocating memory, but when a buffer is
|
|
|
1042 * abandoned every single allocated chunk must be freed, which may be slow.
|
|
|
1043 * 2. Allocate larger blocks of memory and keep track of chunks ourselves.
|
|
|
1044 * This is fast for abandoning, but the use of linked lists is slow for
|
|
|
1045 * finding a free chunk. Esp. when a lot of lines are changed or deleted.
|
|
|
1046 * A bit of profiling showed that the first method is faster, especially when
|
|
|
1047 * making a large number of changes, under the condition that malloc()/free()
|
|
|
1048 * is implemented efficiently.
|
|
|
1049 */
|
|
|
1050 #ifdef U_USE_MALLOC
|
|
|
1051 /*
|
|
|
1052 * Version of undo memory allocation using malloc()/free()
|
|
|
1053 *
|
|
|
1054 * U_FREE_LINE() and U_ALLOC_LINE() are macros that invoke vim_free() and
|
|
|
1055 * lalloc() directly.
|
|
|
1056 */
|
|
|
1057
|
|
|
1058 /*
|
|
|
1059 * Free all allocated memory blocks for the buffer 'buf'.
|
|
|
1060 */
|
|
|
1061 void
|
|
|
1062 u_blockfree(buf)
|
|
|
1063 buf_T *buf;
|
|
|
1064 {
|
|
|
1065 while (buf->b_u_newhead != NULL)
|
|
|
1066 u_freelist(buf, buf->b_u_newhead);
|
|
359
|
1067 U_FREE_LINE(buf->b_u_line_ptr);
|
|
168
|
1068 }
|
|
|
1069
|
|
|
1070 #else
|
|
|
1071 /*
|
|
|
1072 * Storage allocation for the undo lines and blocks of the current file.
|
|
|
1073 * Version where Vim keeps track of the available memory.
|
|
7
|
1074 */
|
|
|
1075
|
|
|
1076 /*
|
|
|
1077 * Memory is allocated in relatively large blocks. These blocks are linked
|
|
|
1078 * in the allocated block list, headed by curbuf->b_block_head. They are all
|
|
|
1079 * freed when abandoning a file, so we don't have to free every single line.
|
|
|
1080 * The list is kept sorted on memory address.
|
|
|
1081 * block_alloc() allocates a block.
|
|
|
1082 * m_blockfree() frees all blocks.
|
|
|
1083 *
|
|
|
1084 * The available chunks of memory are kept in free chunk lists. There is
|
|
|
1085 * one free list for each block of allocated memory. The list is kept sorted
|
|
|
1086 * on memory address.
|
|
|
1087 * u_alloc_line() gets a chunk from the free lists.
|
|
|
1088 * u_free_line() returns a chunk to the free lists.
|
|
|
1089 * curbuf->b_m_search points to the chunk before the chunk that was
|
|
|
1090 * freed/allocated the last time.
|
|
|
1091 * curbuf->b_mb_current points to the b_head where curbuf->b_m_search
|
|
|
1092 * points into the free list.
|
|
|
1093 *
|
|
|
1094 *
|
|
|
1095 * b_block_head /---> block #1 /---> block #2
|
|
|
1096 * mb_next ---/ mb_next ---/ mb_next ---> NULL
|
|
|
1097 * mb_info mb_info mb_info
|
|
|
1098 * | | |
|
|
|
1099 * V V V
|
|
|
1100 * NULL free chunk #1.1 free chunk #2.1
|
|
|
1101 * | |
|
|
|
1102 * V V
|
|
|
1103 * free chunk #1.2 NULL
|
|
|
1104 * |
|
|
|
1105 * V
|
|
|
1106 * NULL
|
|
|
1107 *
|
|
|
1108 * When a single free chunk list would have been used, it could take a lot
|
|
|
1109 * of time in u_free_line() to find the correct place to insert a chunk in the
|
|
|
1110 * free list. The single free list would become very long when many lines are
|
|
|
1111 * changed (e.g. with :%s/^M$//).
|
|
|
1112 */
|
|
|
1113
|
|
|
1114 /*
|
|
|
1115 * this blocksize is used when allocating new lines
|
|
|
1116 */
|
|
|
1117 #define MEMBLOCKSIZE 2044
|
|
|
1118
|
|
|
1119 /*
|
|
|
1120 * The size field contains the size of the chunk, including the size field
|
|
|
1121 * itself.
|
|
|
1122 *
|
|
|
1123 * When the chunk is not in-use it is preceded with the m_info structure.
|
|
|
1124 * The m_next field links it in one of the free chunk lists.
|
|
|
1125 *
|
|
|
1126 * On most unix systems structures have to be longword (32 or 64 bit) aligned.
|
|
|
1127 * On most other systems they are short (16 bit) aligned.
|
|
|
1128 */
|
|
|
1129
|
|
|
1130 /* the structure definitions are now in structs.h */
|
|
|
1131
|
|
|
1132 #ifdef ALIGN_LONG
|
|
|
1133 /* size of m_size */
|
|
|
1134 # define M_OFFSET (sizeof(long_u))
|
|
|
1135 #else
|
|
|
1136 /* size of m_size */
|
|
|
1137 # define M_OFFSET (sizeof(short_u))
|
|
|
1138 #endif
|
|
|
1139
|
|
168
|
1140 static char_u *u_blockalloc __ARGS((long_u));
|
|
|
1141
|
|
7
|
1142 /*
|
|
|
1143 * Allocate a block of memory and link it in the allocated block list.
|
|
|
1144 */
|
|
|
1145 static char_u *
|
|
|
1146 u_blockalloc(size)
|
|
|
1147 long_u size;
|
|
|
1148 {
|
|
|
1149 mblock_T *p;
|
|
|
1150 mblock_T *mp, *next;
|
|
|
1151
|
|
|
1152 p = (mblock_T *)lalloc(size + sizeof(mblock_T), FALSE);
|
|
|
1153 if (p != NULL)
|
|
|
1154 {
|
|
|
1155 /* Insert the block into the allocated block list, keeping it
|
|
|
1156 sorted on address. */
|
|
|
1157 for (mp = &curbuf->b_block_head;
|
|
|
1158 (next = mp->mb_next) != NULL && next < p;
|
|
|
1159 mp = next)
|
|
|
1160 ;
|
|
|
1161 p->mb_next = next; /* link in block list */
|
|
|
1162 p->mb_size = size;
|
|
168
|
1163 p->mb_maxsize = 0; /* nothing free yet */
|
|
7
|
1164 mp->mb_next = p;
|
|
|
1165 p->mb_info.m_next = NULL; /* clear free list */
|
|
|
1166 p->mb_info.m_size = 0;
|
|
|
1167 curbuf->b_mb_current = p; /* remember current block */
|
|
|
1168 curbuf->b_m_search = NULL;
|
|
|
1169 p++; /* return usable memory */
|
|
|
1170 }
|
|
|
1171 return (char_u *)p;
|
|
|
1172 }
|
|
|
1173
|
|
|
1174 /*
|
|
|
1175 * free all allocated memory blocks for the buffer 'buf'
|
|
|
1176 */
|
|
|
1177 void
|
|
|
1178 u_blockfree(buf)
|
|
|
1179 buf_T *buf;
|
|
|
1180 {
|
|
|
1181 mblock_T *p, *np;
|
|
|
1182
|
|
|
1183 for (p = buf->b_block_head.mb_next; p != NULL; p = np)
|
|
|
1184 {
|
|
|
1185 np = p->mb_next;
|
|
|
1186 vim_free(p);
|
|
|
1187 }
|
|
|
1188 buf->b_block_head.mb_next = NULL;
|
|
|
1189 buf->b_m_search = NULL;
|
|
|
1190 buf->b_mb_current = NULL;
|
|
|
1191 }
|
|
|
1192
|
|
|
1193 /*
|
|
|
1194 * Free a chunk of memory for the current buffer.
|
|
|
1195 * Insert the chunk into the correct free list, keeping it sorted on address.
|
|
|
1196 */
|
|
|
1197 static void
|
|
|
1198 u_free_line(ptr, keep)
|
|
|
1199 char_u *ptr;
|
|
|
1200 int keep; /* don't free the block when it's empty */
|
|
|
1201 {
|
|
|
1202 minfo_T *next;
|
|
|
1203 minfo_T *prev, *curr;
|
|
|
1204 minfo_T *mp;
|
|
|
1205 mblock_T *nextb;
|
|
|
1206 mblock_T *prevb;
|
|
168
|
1207 long_u maxsize;
|
|
7
|
1208
|
|
|
1209 if (ptr == NULL || ptr == IObuff)
|
|
|
1210 return; /* illegal address can happen in out-of-memory situations */
|
|
|
1211
|
|
|
1212 mp = (minfo_T *)(ptr - M_OFFSET);
|
|
|
1213
|
|
|
1214 /* find block where chunk could be a part off */
|
|
|
1215 /* if we change curbuf->b_mb_current, curbuf->b_m_search is set to NULL */
|
|
|
1216 if (curbuf->b_mb_current == NULL || mp < (minfo_T *)curbuf->b_mb_current)
|
|
|
1217 {
|
|
|
1218 curbuf->b_mb_current = curbuf->b_block_head.mb_next;
|
|
|
1219 curbuf->b_m_search = NULL;
|
|
|
1220 }
|
|
|
1221 if ((nextb = curbuf->b_mb_current->mb_next) != NULL
|
|
|
1222 && (minfo_T *)nextb < mp)
|
|
|
1223 {
|
|
|
1224 curbuf->b_mb_current = nextb;
|
|
|
1225 curbuf->b_m_search = NULL;
|
|
|
1226 }
|
|
|
1227 while ((nextb = curbuf->b_mb_current->mb_next) != NULL
|
|
|
1228 && (minfo_T *)nextb < mp)
|
|
|
1229 curbuf->b_mb_current = nextb;
|
|
|
1230
|
|
|
1231 curr = NULL;
|
|
|
1232 /*
|
|
|
1233 * If mp is smaller than curbuf->b_m_search->m_next go to the start of
|
|
|
1234 * the free list
|
|
|
1235 */
|
|
|
1236 if (curbuf->b_m_search == NULL || mp < (curbuf->b_m_search->m_next))
|
|
|
1237 next = &(curbuf->b_mb_current->mb_info);
|
|
|
1238 else
|
|
|
1239 next = curbuf->b_m_search;
|
|
|
1240 /*
|
|
|
1241 * The following loop is executed very often.
|
|
|
1242 * Therefore it has been optimized at the cost of readability.
|
|
|
1243 * Keep it fast!
|
|
|
1244 */
|
|
|
1245 #ifdef SLOW_BUT_EASY_TO_READ
|
|
|
1246 do
|
|
|
1247 {
|
|
|
1248 prev = curr;
|
|
|
1249 curr = next;
|
|
|
1250 next = next->m_next;
|
|
|
1251 }
|
|
|
1252 while (mp > next && next != NULL);
|
|
|
1253 #else
|
|
|
1254 do /* first, middle, last */
|
|
|
1255 {
|
|
|
1256 prev = next->m_next; /* curr, next, prev */
|
|
|
1257 if (prev == NULL || mp <= prev)
|
|
|
1258 {
|
|
|
1259 prev = curr;
|
|
|
1260 curr = next;
|
|
|
1261 next = next->m_next;
|
|
|
1262 break;
|
|
|
1263 }
|
|
|
1264 curr = prev->m_next; /* next, prev, curr */
|
|
|
1265 if (curr == NULL || mp <= curr)
|
|
|
1266 {
|
|
|
1267 prev = next;
|
|
|
1268 curr = prev->m_next;
|
|
|
1269 next = curr->m_next;
|
|
|
1270 break;
|
|
|
1271 }
|
|
|
1272 next = curr->m_next; /* prev, curr, next */
|
|
|
1273 }
|
|
|
1274 while (mp > next && next != NULL);
|
|
|
1275 #endif
|
|
|
1276
|
|
|
1277 /* if *mp and *next are concatenated, join them into one chunk */
|
|
|
1278 if ((char_u *)mp + mp->m_size == (char_u *)next)
|
|
|
1279 {
|
|
|
1280 mp->m_size += next->m_size;
|
|
|
1281 mp->m_next = next->m_next;
|
|
|
1282 }
|
|
|
1283 else
|
|
|
1284 mp->m_next = next;
|
|
168
|
1285 maxsize = mp->m_size;
|
|
7
|
1286
|
|
|
1287 /* if *curr and *mp are concatenated, join them */
|
|
|
1288 if (prev != NULL && (char_u *)curr + curr->m_size == (char_u *)mp)
|
|
|
1289 {
|
|
|
1290 curr->m_size += mp->m_size;
|
|
168
|
1291 maxsize = curr->m_size;
|
|
7
|
1292 curr->m_next = mp->m_next;
|
|
|
1293 curbuf->b_m_search = prev;
|
|
|
1294 }
|
|
|
1295 else
|
|
|
1296 {
|
|
|
1297 curr->m_next = mp;
|
|
|
1298 curbuf->b_m_search = curr; /* put curbuf->b_m_search before freed
|
|
|
1299 chunk */
|
|
|
1300 }
|
|
|
1301
|
|
|
1302 /*
|
|
|
1303 * If the block only containes free memory now, release it.
|
|
|
1304 */
|
|
|
1305 if (!keep && curbuf->b_mb_current->mb_size
|
|
|
1306 == curbuf->b_mb_current->mb_info.m_next->m_size)
|
|
|
1307 {
|
|
|
1308 /* Find the block before the current one to be able to unlink it from
|
|
|
1309 * the list of blocks. */
|
|
|
1310 prevb = &curbuf->b_block_head;
|
|
|
1311 for (nextb = prevb->mb_next; nextb != curbuf->b_mb_current;
|
|
|
1312 nextb = nextb->mb_next)
|
|
|
1313 prevb = nextb;
|
|
|
1314 prevb->mb_next = nextb->mb_next;
|
|
|
1315 vim_free(nextb);
|
|
|
1316 curbuf->b_mb_current = NULL;
|
|
|
1317 curbuf->b_m_search = NULL;
|
|
|
1318 }
|
|
168
|
1319 else if (curbuf->b_mb_current->mb_maxsize < maxsize)
|
|
|
1320 curbuf->b_mb_current->mb_maxsize = maxsize;
|
|
7
|
1321 }
|
|
|
1322
|
|
|
1323 /*
|
|
|
1324 * Allocate and initialize a new line structure with room for at least
|
|
|
1325 * 'size' characters plus a terminating NUL.
|
|
|
1326 */
|
|
|
1327 static char_u *
|
|
|
1328 u_alloc_line(size)
|
|
|
1329 unsigned size;
|
|
|
1330 {
|
|
|
1331 minfo_T *mp, *mprev, *mp2;
|
|
|
1332 mblock_T *mbp;
|
|
|
1333 int size_align;
|
|
|
1334
|
|
|
1335 /*
|
|
|
1336 * Add room for size field and trailing NUL byte.
|
|
|
1337 * Adjust for minimal size (must be able to store minfo_T
|
|
|
1338 * plus a trailing NUL, so the chunk can be released again)
|
|
|
1339 */
|
|
|
1340 size += M_OFFSET + 1;
|
|
|
1341 if (size < sizeof(minfo_T) + 1)
|
|
|
1342 size = sizeof(minfo_T) + 1;
|
|
|
1343
|
|
|
1344 /*
|
|
|
1345 * round size up for alignment
|
|
|
1346 */
|
|
|
1347 size_align = (size + ALIGN_MASK) & ~ALIGN_MASK;
|
|
|
1348
|
|
|
1349 /*
|
|
|
1350 * If curbuf->b_m_search is NULL (uninitialized free list) start at
|
|
|
1351 * curbuf->b_block_head
|
|
|
1352 */
|
|
|
1353 if (curbuf->b_mb_current == NULL || curbuf->b_m_search == NULL)
|
|
|
1354 {
|
|
|
1355 curbuf->b_mb_current = &curbuf->b_block_head;
|
|
|
1356 curbuf->b_m_search = &(curbuf->b_block_head.mb_info);
|
|
|
1357 }
|
|
|
1358
|
|
168
|
1359 /* Search for a block with enough space. */
|
|
7
|
1360 mbp = curbuf->b_mb_current;
|
|
168
|
1361 while (mbp->mb_maxsize < size_align)
|
|
7
|
1362 {
|
|
168
|
1363 if (mbp->mb_next != NULL)
|
|
7
|
1364 mbp = mbp->mb_next;
|
|
|
1365 else
|
|
|
1366 mbp = &curbuf->b_block_head;
|
|
168
|
1367 if (mbp == curbuf->b_mb_current)
|
|
7
|
1368 {
|
|
168
|
1369 int n = (size_align > (MEMBLOCKSIZE / 4)
|
|
|
1370 ? size_align : MEMBLOCKSIZE);
|
|
7
|
1371
|
|
168
|
1372 /* Back where we started in block list: need to add a new block
|
|
|
1373 * with enough space. */
|
|
|
1374 mp = (minfo_T *)u_blockalloc((long_u)n);
|
|
|
1375 if (mp == NULL)
|
|
|
1376 return (NULL);
|
|
|
1377 mp->m_size = n;
|
|
|
1378 u_free_line((char_u *)mp + M_OFFSET, TRUE);
|
|
|
1379 mbp = curbuf->b_mb_current;
|
|
|
1380 break;
|
|
|
1381 }
|
|
|
1382 }
|
|
|
1383 if (mbp != curbuf->b_mb_current)
|
|
|
1384 curbuf->b_m_search = &(mbp->mb_info);
|
|
|
1385
|
|
|
1386 /* In this block find a chunk with enough space. */
|
|
|
1387 mprev = curbuf->b_m_search;
|
|
|
1388 mp = curbuf->b_m_search->m_next;
|
|
407
|
1389 for (;;)
|
|
168
|
1390 {
|
|
|
1391 if (mp == NULL) /* at end of the list */
|
|
|
1392 mp = &(mbp->mb_info); /* wrap around to begin */
|
|
|
1393 if (mp->m_size >= size)
|
|
|
1394 break;
|
|
|
1395 if (mp == curbuf->b_m_search)
|
|
|
1396 {
|
|
|
1397 /* back where we started in free chunk list: "cannot happen" */
|
|
|
1398 EMSG2(_(e_intern2), "u_alloc_line()");
|
|
|
1399 return NULL;
|
|
7
|
1400 }
|
|
|
1401 mprev = mp;
|
|
168
|
1402 mp = mp->m_next;
|
|
7
|
1403 }
|
|
|
1404
|
|
168
|
1405 /* when using the largest chunk adjust mb_maxsize */
|
|
|
1406 if (mp->m_size >= mbp->mb_maxsize)
|
|
|
1407 mbp->mb_maxsize = 0;
|
|
|
1408
|
|
7
|
1409 /* if the chunk we found is large enough, split it up in two */
|
|
|
1410 if ((long)mp->m_size - size_align >= (long)(sizeof(minfo_T) + 1))
|
|
|
1411 {
|
|
|
1412 mp2 = (minfo_T *)((char_u *)mp + size_align);
|
|
|
1413 mp2->m_size = mp->m_size - size_align;
|
|
|
1414 mp2->m_next = mp->m_next;
|
|
|
1415 mprev->m_next = mp2;
|
|
|
1416 mp->m_size = size_align;
|
|
|
1417 }
|
|
|
1418 else /* remove *mp from the free list */
|
|
|
1419 {
|
|
|
1420 mprev->m_next = mp->m_next;
|
|
|
1421 }
|
|
|
1422 curbuf->b_m_search = mprev;
|
|
|
1423 curbuf->b_mb_current = mbp;
|
|
|
1424
|
|
168
|
1425 /* If using the largest chunk need to find the new largest chunk */
|
|
|
1426 if (mbp->mb_maxsize == 0)
|
|
|
1427 for (mp2 = &(mbp->mb_info); mp2 != NULL; mp2 = mp2->m_next)
|
|
|
1428 if (mbp->mb_maxsize < mp2->m_size)
|
|
|
1429 mbp->mb_maxsize = mp2->m_size;
|
|
|
1430
|
|
7
|
1431 mp = (minfo_T *)((char_u *)mp + M_OFFSET);
|
|
|
1432 *(char_u *)mp = NUL; /* set the first byte to NUL */
|
|
|
1433
|
|
|
1434 return ((char_u *)mp);
|
|
|
1435 }
|
|
168
|
1436 #endif
|
|
7
|
1437
|
|
|
1438 /*
|
|
|
1439 * u_save_line(): allocate memory with u_alloc_line() and copy line 'lnum'
|
|
|
1440 * into it.
|
|
|
1441 */
|
|
|
1442 static char_u *
|
|
|
1443 u_save_line(lnum)
|
|
|
1444 linenr_T lnum;
|
|
|
1445 {
|
|
|
1446 char_u *src;
|
|
|
1447 char_u *dst;
|
|
|
1448 unsigned len;
|
|
|
1449
|
|
|
1450 src = ml_get(lnum);
|
|
|
1451 len = (unsigned)STRLEN(src);
|
|
168
|
1452 if ((dst = U_ALLOC_LINE(len)) != NULL)
|
|
7
|
1453 mch_memmove(dst, src, (size_t)(len + 1));
|
|
|
1454 return (dst);
|
|
|
1455 }
|
|
|
1456
|
|
|
1457 /*
|
|
|
1458 * Check if the 'modified' flag is set, or 'ff' has changed (only need to
|
|
|
1459 * check the first character, because it can only be "dos", "unix" or "mac").
|
|
|
1460 * "nofile" and "scratch" type buffers are considered to always be unchanged.
|
|
|
1461 */
|
|
|
1462 int
|
|
|
1463 bufIsChanged(buf)
|
|
|
1464 buf_T *buf;
|
|
|
1465 {
|
|
|
1466 return
|
|
|
1467 #ifdef FEAT_QUICKFIX
|
|
|
1468 !bt_dontwrite(buf) &&
|
|
|
1469 #endif
|
|
|
1470 (buf->b_changed || file_ff_differs(buf));
|
|
|
1471 }
|
|
|
1472
|
|
|
1473 int
|
|
|
1474 curbufIsChanged()
|
|
|
1475 {
|
|
|
1476 return
|
|
|
1477 #ifdef FEAT_QUICKFIX
|
|
|
1478 !bt_dontwrite(curbuf) &&
|
|
|
1479 #endif
|
|
|
1480 (curbuf->b_changed || file_ff_differs(curbuf));
|
|
|
1481 }
|
