| File: | src/usr.bin/mg/undo.c |
| Warning: | line 401, column 7 Although the value stored to 'wp' is used in the enclosing expression, the value is never actually read from 'wp' |
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| 1 | /* $OpenBSD: undo.c,v 1.58 2016/09/05 08:10:58 lum Exp $ */ |
| 2 | /* |
| 3 | * This file is in the public domain |
| 4 | */ |
| 5 | |
| 6 | #include <sys/queue.h> |
| 7 | #include <signal.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <string.h> |
| 11 | |
| 12 | #include "def.h" |
| 13 | #include "kbd.h" |
| 14 | |
| 15 | #define MAX_FREE_RECORDS32 32 |
| 16 | |
| 17 | /* |
| 18 | * Local variables |
| 19 | */ |
| 20 | static struct undoq undo_free; |
| 21 | static int undo_free_num; |
| 22 | static int boundary_flag = TRUE1; |
| 23 | static int undo_enable_flag = TRUE1; |
| 24 | |
| 25 | /* |
| 26 | * Local functions |
| 27 | */ |
| 28 | static int find_dot(struct line *, int); |
| 29 | static int find_lo(int, struct line **, int *, int *); |
| 30 | static struct undo_rec *new_undo_record(void); |
| 31 | static int drop_oldest_undo_record(void); |
| 32 | |
| 33 | /* |
| 34 | * find_dot, find_lo() |
| 35 | * |
| 36 | * Find an absolute dot in the buffer from a line/offset pair, and vice-versa. |
| 37 | * |
| 38 | * Since lines can be deleted while they are referenced by undo record, we |
| 39 | * need to have an absolute dot to have something reliable. |
| 40 | */ |
| 41 | static int |
| 42 | find_dot(struct line *lp, int off) |
| 43 | { |
| 44 | int count = 0; |
| 45 | struct line *p; |
| 46 | |
| 47 | for (p = curbp->b_headp; p != lp; p = lforw(p)((p)->l_fp)) { |
| 48 | if (count != 0) { |
| 49 | if (p == curbp->b_headp) { |
| 50 | dobeep(); |
| 51 | ewprintf("Error: Undo stuff called with a" |
| 52 | "nonexistent line"); |
| 53 | return (FALSE0); |
| 54 | } |
| 55 | } |
| 56 | count += llength(p)((p)->l_used) + 1; |
| 57 | } |
| 58 | count += off; |
| 59 | |
| 60 | return (count); |
| 61 | } |
| 62 | |
| 63 | static int |
| 64 | find_lo(int pos, struct line **olp, int *offset, int *lnum) |
| 65 | { |
| 66 | struct line *p; |
| 67 | int lineno; |
| 68 | |
| 69 | p = curbp->b_headp; |
| 70 | lineno = 0; |
| 71 | while (pos > llength(p)((p)->l_used)) { |
| 72 | pos -= llength(p)((p)->l_used) + 1; |
| 73 | if ((p = lforw(p)((p)->l_fp)) == curbp->b_headp) { |
| 74 | *olp = NULL((void *)0); |
| 75 | *offset = 0; |
| 76 | return (FALSE0); |
| 77 | } |
| 78 | lineno++; |
| 79 | } |
| 80 | *olp = p; |
| 81 | *offset = pos; |
| 82 | *lnum = lineno; |
| 83 | |
| 84 | return (TRUE1); |
| 85 | } |
| 86 | |
| 87 | static struct undo_rec * |
| 88 | new_undo_record(void) |
| 89 | { |
| 90 | struct undo_rec *rec; |
| 91 | |
| 92 | rec = TAILQ_FIRST(&undo_free)((&undo_free)->tqh_first); |
| 93 | if (rec != NULL((void *)0)) { |
| 94 | /* Remove it from the free-list */ |
| 95 | TAILQ_REMOVE(&undo_free, rec, next)do { if (((rec)->next.tqe_next) != ((void *)0)) (rec)-> next.tqe_next->next.tqe_prev = (rec)->next.tqe_prev; else (&undo_free)->tqh_last = (rec)->next.tqe_prev; *(rec )->next.tqe_prev = (rec)->next.tqe_next; ; ; } while (0 ); |
| 96 | undo_free_num--; |
| 97 | } else { |
| 98 | if ((rec = malloc(sizeof(*rec))) == NULL((void *)0)) |
| 99 | panic("Out of memory in undo code (record)"); |
| 100 | } |
| 101 | memset(rec, 0, sizeof(struct undo_rec)); |
| 102 | |
| 103 | return (rec); |
| 104 | } |
| 105 | |
| 106 | void |
| 107 | free_undo_record(struct undo_rec *rec) |
| 108 | { |
| 109 | static int initialised = 0; |
| 110 | |
| 111 | /* |
| 112 | * On the first run, do initialisation of the free list. |
| 113 | */ |
| 114 | if (initialised == 0) { |
| 115 | TAILQ_INIT(&undo_free)do { (&undo_free)->tqh_first = ((void *)0); (&undo_free )->tqh_last = &(&undo_free)->tqh_first; } while (0); |
| 116 | initialised = 1; |
| 117 | } |
| 118 | free(rec->content); |
| 119 | rec->content = NULL((void *)0); |
| 120 | if (undo_free_num >= MAX_FREE_RECORDS32) { |
| 121 | free(rec); |
| 122 | return; |
| 123 | } |
| 124 | undo_free_num++; |
| 125 | |
| 126 | TAILQ_INSERT_HEAD(&undo_free, rec, next)do { if (((rec)->next.tqe_next = (&undo_free)->tqh_first ) != ((void *)0)) (&undo_free)->tqh_first->next.tqe_prev = &(rec)->next.tqe_next; else (&undo_free)->tqh_last = &(rec)->next.tqe_next; (&undo_free)->tqh_first = (rec); (rec)->next.tqe_prev = &(&undo_free)-> tqh_first; } while (0); |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * Drop the oldest undo record in our list. Return 1 if we could remove it, |
| 131 | * 0 if the undo list was empty. |
| 132 | */ |
| 133 | static int |
| 134 | drop_oldest_undo_record(void) |
| 135 | { |
| 136 | struct undo_rec *rec; |
| 137 | |
| 138 | rec = TAILQ_LAST(&curbp->b_undo, undoq)(*(((struct undoq *)((&curbp->b_undo)->tqh_last))-> tqh_last)); |
| 139 | if (rec != NULL((void *)0)) { |
| 140 | undo_free_num--; |
| 141 | TAILQ_REMOVE(&curbp->b_undo, rec, next)do { if (((rec)->next.tqe_next) != ((void *)0)) (rec)-> next.tqe_next->next.tqe_prev = (rec)->next.tqe_prev; else (&curbp->b_undo)->tqh_last = (rec)->next.tqe_prev ; *(rec)->next.tqe_prev = (rec)->next.tqe_next; ; ; } while (0); |
| 142 | free_undo_record(rec); |
| 143 | return (1); |
| 144 | } |
| 145 | return (0); |
| 146 | } |
| 147 | |
| 148 | static int |
| 149 | lastrectype(void) |
| 150 | { |
| 151 | struct undo_rec *rec; |
| 152 | |
| 153 | if ((rec = TAILQ_FIRST(&curbp->b_undo)((&curbp->b_undo)->tqh_first)) != NULL((void *)0)) |
| 154 | return (rec->type); |
| 155 | return (0); |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * Returns TRUE if undo is enabled, FALSE otherwise. |
| 160 | */ |
| 161 | int |
| 162 | undo_enabled(void) |
| 163 | { |
| 164 | return (undo_enable_flag); |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * undo_enable: toggle undo_enable. |
| 169 | * Returns the previous value of the flag. |
| 170 | */ |
| 171 | int |
| 172 | undo_enable(int f, int n) |
| 173 | { |
| 174 | int pon = undo_enable_flag; |
| 175 | |
| 176 | if (f & (FFARG7 | FFRAND8)) |
| 177 | undo_enable_flag = n > 0; |
| 178 | else |
| 179 | undo_enable_flag = !undo_enable_flag; |
| 180 | |
| 181 | if (!(f & FFRAND8)) |
| 182 | ewprintf("Undo %sabled", undo_enable_flag ? "en" : "dis"); |
| 183 | |
| 184 | return (pon); |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * If undo is enabled, then: |
| 189 | * Toggle undo boundary recording. |
| 190 | * If called with an argument, (n > 0) => enable. Otherwise disable. |
| 191 | * In either case, add an undo boundary |
| 192 | * If undo is disabled, this function has no effect. |
| 193 | */ |
| 194 | int |
| 195 | undo_boundary_enable(int f, int n) |
| 196 | { |
| 197 | int bon = boundary_flag; |
| 198 | |
| 199 | if (!undo_enable_flag) |
| 200 | return (FALSE0); |
| 201 | |
| 202 | undo_add_boundary(FFRAND8, 1); |
| 203 | |
| 204 | if (f & (FFARG7 | FFRAND8)) |
| 205 | boundary_flag = n > 0; |
| 206 | else |
| 207 | boundary_flag = !boundary_flag; |
| 208 | |
| 209 | if (!(f & FFRAND8)) |
| 210 | ewprintf("Undo boundaries %sabled", |
| 211 | boundary_flag ? "en" : "dis"); |
| 212 | |
| 213 | return (bon); |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Record an undo boundary, unless boundary_flag == FALSE. |
| 218 | * Does nothing if previous undo entry is already a boundary or 'modified' flag. |
| 219 | */ |
| 220 | int |
| 221 | undo_add_boundary(int f, int n) |
| 222 | { |
| 223 | struct undo_rec *rec; |
| 224 | int last; |
| 225 | |
| 226 | if (boundary_flag == FALSE0) |
| 227 | return (FALSE0); |
| 228 | |
| 229 | last = lastrectype(); |
| 230 | if (last == BOUNDARY || last == MODIFIED) |
| 231 | return (TRUE1); |
| 232 | |
| 233 | rec = new_undo_record(); |
| 234 | rec->type = BOUNDARY; |
| 235 | |
| 236 | TAILQ_INSERT_HEAD(&curbp->b_undo, rec, next)do { if (((rec)->next.tqe_next = (&curbp->b_undo)-> tqh_first) != ((void *)0)) (&curbp->b_undo)->tqh_first ->next.tqe_prev = &(rec)->next.tqe_next; else (& curbp->b_undo)->tqh_last = &(rec)->next.tqe_next ; (&curbp->b_undo)->tqh_first = (rec); (rec)->next .tqe_prev = &(&curbp->b_undo)->tqh_first; } while (0); |
| 237 | |
| 238 | return (TRUE1); |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * Record an undo "modified" boundary |
| 243 | */ |
| 244 | void |
| 245 | undo_add_modified(void) |
| 246 | { |
| 247 | struct undo_rec *rec, *trec; |
| 248 | |
| 249 | TAILQ_FOREACH_SAFE(rec, &curbp->b_undo, next, trec)for ((rec) = ((&curbp->b_undo)->tqh_first); (rec) != ((void *)0) && ((trec) = ((rec)->next.tqe_next), 1 ); (rec) = (trec)) |
| 250 | if (rec->type == MODIFIED) { |
| 251 | TAILQ_REMOVE(&curbp->b_undo, rec, next)do { if (((rec)->next.tqe_next) != ((void *)0)) (rec)-> next.tqe_next->next.tqe_prev = (rec)->next.tqe_prev; else (&curbp->b_undo)->tqh_last = (rec)->next.tqe_prev ; *(rec)->next.tqe_prev = (rec)->next.tqe_next; ; ; } while (0); |
| 252 | free_undo_record(rec); |
| 253 | } |
| 254 | |
| 255 | rec = new_undo_record(); |
| 256 | rec->type = MODIFIED; |
| 257 | |
| 258 | TAILQ_INSERT_HEAD(&curbp->b_undo, rec, next)do { if (((rec)->next.tqe_next = (&curbp->b_undo)-> tqh_first) != ((void *)0)) (&curbp->b_undo)->tqh_first ->next.tqe_prev = &(rec)->next.tqe_next; else (& curbp->b_undo)->tqh_last = &(rec)->next.tqe_next ; (&curbp->b_undo)->tqh_first = (rec); (rec)->next .tqe_prev = &(&curbp->b_undo)->tqh_first; } while (0); |
| 259 | |
| 260 | return; |
| 261 | } |
| 262 | |
| 263 | int |
| 264 | undo_add_insert(struct line *lp, int offset, int size) |
| 265 | { |
| 266 | struct region reg; |
| 267 | struct undo_rec *rec; |
| 268 | int pos; |
| 269 | |
| 270 | if (!undo_enable_flag) |
| 271 | return (TRUE1); |
| 272 | |
| 273 | memset(®, 0, sizeof(reg)); |
| 274 | reg.r_linep = lp; |
| 275 | reg.r_offset = offset; |
| 276 | reg.r_size = size; |
| 277 | |
| 278 | pos = find_dot(lp, offset); |
| 279 | |
| 280 | /* |
| 281 | * We try to reuse the last undo record to `compress' things. |
| 282 | */ |
| 283 | rec = TAILQ_FIRST(&curbp->b_undo)((&curbp->b_undo)->tqh_first); |
| 284 | if (rec != NULL((void *)0) && rec->type == INSERT) { |
| 285 | if (rec->pos + rec->region.r_size == pos) { |
| 286 | rec->region.r_size += reg.r_size; |
| 287 | return (TRUE1); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * We couldn't reuse the last undo record, so prepare a new one. |
| 293 | */ |
| 294 | rec = new_undo_record(); |
| 295 | rec->pos = pos; |
| 296 | rec->type = INSERT; |
| 297 | memmove(&rec->region, ®, sizeof(struct region)); |
| 298 | rec->content = NULL((void *)0); |
| 299 | |
| 300 | undo_add_boundary(FFRAND8, 1); |
| 301 | |
| 302 | TAILQ_INSERT_HEAD(&curbp->b_undo, rec, next)do { if (((rec)->next.tqe_next = (&curbp->b_undo)-> tqh_first) != ((void *)0)) (&curbp->b_undo)->tqh_first ->next.tqe_prev = &(rec)->next.tqe_next; else (& curbp->b_undo)->tqh_last = &(rec)->next.tqe_next ; (&curbp->b_undo)->tqh_first = (rec); (rec)->next .tqe_prev = &(&curbp->b_undo)->tqh_first; } while (0); |
| 303 | |
| 304 | return (TRUE1); |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * This of course must be done _before_ the actual deletion is done. |
| 309 | */ |
| 310 | int |
| 311 | undo_add_delete(struct line *lp, int offset, int size, int isreg) |
| 312 | { |
| 313 | struct region reg; |
| 314 | struct undo_rec *rec; |
| 315 | int pos; |
| 316 | |
| 317 | if (!undo_enable_flag) |
| 318 | return (TRUE1); |
| 319 | |
| 320 | memset(®, 0, sizeof(reg)); |
| 321 | reg.r_linep = lp; |
| 322 | reg.r_offset = offset; |
| 323 | reg.r_size = size; |
| 324 | |
| 325 | pos = find_dot(lp, offset); |
| 326 | |
| 327 | if (offset == llength(lp)((lp)->l_used)) /* if it's a newline... */ |
| 328 | undo_add_boundary(FFRAND8, 1); |
| 329 | else if ((rec = TAILQ_FIRST(&curbp->b_undo)((&curbp->b_undo)->tqh_first)) != NULL((void *)0)) { |
| 330 | /* |
| 331 | * Separate this command from the previous one if we're not |
| 332 | * just before the previous record... |
| 333 | */ |
| 334 | if (!isreg && rec->type == DELETE) { |
| 335 | if (rec->pos - rec->region.r_size != pos) |
| 336 | undo_add_boundary(FFRAND8, 1); |
| 337 | } |
| 338 | } |
| 339 | rec = new_undo_record(); |
| 340 | rec->pos = pos; |
| 341 | if (isreg) |
| 342 | rec->type = DELREG; |
| 343 | else |
| 344 | rec->type = DELETE; |
| 345 | memmove(&rec->region, ®, sizeof(struct region)); |
| 346 | do { |
| 347 | rec->content = malloc(reg.r_size + 1); |
| 348 | } while ((rec->content == NULL((void *)0)) && drop_oldest_undo_record()); |
| 349 | |
| 350 | if (rec->content == NULL((void *)0)) |
| 351 | panic("Out of memory"); |
| 352 | |
| 353 | region_get_data(®, rec->content, reg.r_size); |
| 354 | |
| 355 | if (isreg || lastrectype() != DELETE) |
| 356 | undo_add_boundary(FFRAND8, 1); |
| 357 | |
| 358 | TAILQ_INSERT_HEAD(&curbp->b_undo, rec, next)do { if (((rec)->next.tqe_next = (&curbp->b_undo)-> tqh_first) != ((void *)0)) (&curbp->b_undo)->tqh_first ->next.tqe_prev = &(rec)->next.tqe_next; else (& curbp->b_undo)->tqh_last = &(rec)->next.tqe_next ; (&curbp->b_undo)->tqh_first = (rec); (rec)->next .tqe_prev = &(&curbp->b_undo)->tqh_first; } while (0); |
| 359 | |
| 360 | return (TRUE1); |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * This of course must be called before the change takes place. |
| 365 | */ |
| 366 | int |
| 367 | undo_add_change(struct line *lp, int offset, int size) |
| 368 | { |
| 369 | if (!undo_enable_flag) |
| 370 | return (TRUE1); |
| 371 | undo_add_boundary(FFRAND8, 1); |
| 372 | boundary_flag = FALSE0; |
| 373 | undo_add_delete(lp, offset, size, 0); |
| 374 | undo_add_insert(lp, offset, size); |
| 375 | boundary_flag = TRUE1; |
| 376 | undo_add_boundary(FFRAND8, 1); |
| 377 | |
| 378 | return (TRUE1); |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * Show the undo records for the current buffer in a new buffer. |
| 383 | */ |
| 384 | /* ARGSUSED */ |
| 385 | int |
| 386 | undo_dump(int f, int n) |
| 387 | { |
| 388 | struct undo_rec *rec; |
| 389 | struct buffer *bp; |
| 390 | struct mgwin *wp; |
| 391 | char buf[4096], tmp[1024]; |
| 392 | int num; |
| 393 | |
| 394 | /* |
| 395 | * Prepare the buffer for insertion. |
| 396 | */ |
| 397 | if ((bp = bfind("*undo*", TRUE1)) == NULL((void *)0)) |
| 398 | return (FALSE0); |
| 399 | bp->b_flag |= BFREADONLY0x10; |
| 400 | bclear(bp); |
| 401 | if ((wp = popbuf(bp, WNONE0x00)) == NULL((void *)0)) |
Although the value stored to 'wp' is used in the enclosing expression, the value is never actually read from 'wp' | |
| 402 | return (FALSE0); |
| 403 | |
| 404 | for (wp = wheadp; wp != NULL((void *)0); wp = wp->w_wndpw_list.l_p.l_wp) { |
| 405 | if (wp->w_bufp == bp) { |
| 406 | wp->w_dotp = bp->b_headp; |
| 407 | wp->w_doto = 0; |
| 408 | } |
| 409 | } |
| 410 | |
| 411 | num = 0; |
| 412 | TAILQ_FOREACH(rec, &curbp->b_undo, next)for((rec) = ((&curbp->b_undo)->tqh_first); (rec) != ((void *)0); (rec) = ((rec)->next.tqe_next)) { |
| 413 | num++; |
| 414 | snprintf(buf, sizeof(buf), |
| 415 | "%d:\t %s at %d ", num, |
| 416 | (rec->type == DELETE) ? "DELETE": |
| 417 | (rec->type == DELREG) ? "DELREGION": |
| 418 | (rec->type == INSERT) ? "INSERT": |
| 419 | (rec->type == BOUNDARY) ? "----" : |
| 420 | (rec->type == MODIFIED) ? "MODIFIED": "UNKNOWN", |
| 421 | rec->pos); |
| 422 | |
| 423 | if (rec->content) { |
| 424 | (void)strlcat(buf, "\"", sizeof(buf)); |
| 425 | snprintf(tmp, sizeof(tmp), "%.*s", rec->region.r_size, |
| 426 | rec->content); |
| 427 | (void)strlcat(buf, tmp, sizeof(buf)); |
| 428 | (void)strlcat(buf, "\"", sizeof(buf)); |
| 429 | } |
| 430 | snprintf(tmp, sizeof(tmp), " [%d]", rec->region.r_size); |
| 431 | if (strlcat(buf, tmp, sizeof(buf)) >= sizeof(buf)) { |
| 432 | dobeep(); |
| 433 | ewprintf("Undo record too large. Aborted."); |
| 434 | return (FALSE0); |
| 435 | } |
| 436 | addlinef(bp, "%s", buf); |
| 437 | } |
| 438 | for (wp = wheadp; wp != NULL((void *)0); wp = wp->w_wndpw_list.l_p.l_wp) { |
| 439 | if (wp->w_bufp == bp) { |
| 440 | wp->w_dotline = num+1; |
| 441 | wp->w_rflag |= WFFULL0x08; |
| 442 | } |
| 443 | } |
| 444 | return (TRUE1); |
| 445 | } |
| 446 | |
| 447 | /* |
| 448 | * After the user did action1, then action2, then action3: |
| 449 | * |
| 450 | * [action3] <--- Undoptr |
| 451 | * [action2] |
| 452 | * [action1] |
| 453 | * ------ |
| 454 | * [undo] |
| 455 | * |
| 456 | * After undo: |
| 457 | * |
| 458 | * [undo of action3] |
| 459 | * [action2] <--- Undoptr |
| 460 | * [action1] |
| 461 | * ------ |
| 462 | * [undo] |
| 463 | * |
| 464 | * After another undo: |
| 465 | * |
| 466 | * |
| 467 | * [undo of action2] |
| 468 | * [undo of action3] |
| 469 | * [action1] <--- Undoptr |
| 470 | * ------ |
| 471 | * [undo] |
| 472 | * |
| 473 | * Note that the "undo of actionX" have no special meaning. Only when |
| 474 | * we undo a deletion, the insertion will be recorded just as if it |
| 475 | * was typed on the keyboard. Resulting in the inverse operation being |
| 476 | * saved in the list. |
| 477 | * |
| 478 | * If undoptr reaches the bottom of the list, or if we moved between |
| 479 | * two undo actions, we make it point back at the topmost record. This is |
| 480 | * how we handle redoing. |
| 481 | */ |
| 482 | /* ARGSUSED */ |
| 483 | int |
| 484 | undo(int f, int n) |
| 485 | { |
| 486 | struct undo_rec *ptr, *nptr; |
| 487 | int done, rval; |
| 488 | struct line *lp; |
| 489 | int offset, save; |
| 490 | static int nulled = FALSE0; |
| 491 | int lineno; |
| 492 | |
| 493 | if (n < 0) |
| 494 | return (FALSE0); |
| 495 | |
| 496 | ptr = curbp->b_undoptr; |
| 497 | |
| 498 | /* first invocation, make ptr point back to the top of the list */ |
| 499 | if ((ptr == NULL((void *)0) && nulled == TRUE1) || rptcount == 0) { |
| 500 | ptr = TAILQ_FIRST(&curbp->b_undo)((&curbp->b_undo)->tqh_first); |
| 501 | nulled = TRUE1; |
| 502 | } |
| 503 | |
| 504 | rval = TRUE1; |
| 505 | while (n--) { |
| 506 | /* if we have a spurious boundary, free it and move on.... */ |
| 507 | while (ptr && ptr->type == BOUNDARY) { |
| 508 | nptr = TAILQ_NEXT(ptr, next)((ptr)->next.tqe_next); |
| 509 | TAILQ_REMOVE(&curbp->b_undo, ptr, next)do { if (((ptr)->next.tqe_next) != ((void *)0)) (ptr)-> next.tqe_next->next.tqe_prev = (ptr)->next.tqe_prev; else (&curbp->b_undo)->tqh_last = (ptr)->next.tqe_prev ; *(ptr)->next.tqe_prev = (ptr)->next.tqe_next; ; ; } while (0); |
| 510 | free_undo_record(ptr); |
| 511 | ptr = nptr; |
| 512 | } |
| 513 | /* |
| 514 | * Ptr is NULL, but on the next run, it will point to the |
| 515 | * top again, redoing all stuff done in the buffer since |
| 516 | * its creation. |
| 517 | */ |
| 518 | if (ptr == NULL((void *)0)) { |
| 519 | dobeep(); |
| 520 | ewprintf("No further undo information"); |
| 521 | rval = FALSE0; |
| 522 | nulled = TRUE1; |
| 523 | break; |
| 524 | } |
| 525 | nulled = FALSE0; |
| 526 | |
| 527 | /* |
| 528 | * Loop while we don't get a boundary specifying we've |
| 529 | * finished the current action... |
| 530 | */ |
| 531 | |
| 532 | undo_add_boundary(FFRAND8, 1); |
| 533 | |
| 534 | save = boundary_flag; |
| 535 | boundary_flag = FALSE0; |
| 536 | |
| 537 | done = 0; |
| 538 | do { |
| 539 | /* |
| 540 | * Move to where this has to apply |
| 541 | * |
| 542 | * Boundaries (and the modified flag) are put as |
| 543 | * position 0 (to save lookup time in find_dot) |
| 544 | * so we must not move there... |
| 545 | */ |
| 546 | if (ptr->type != BOUNDARY && ptr->type != MODIFIED) { |
| 547 | if (find_lo(ptr->pos, &lp, |
| 548 | &offset, &lineno) == FALSE0) { |
| 549 | dobeep(); |
| 550 | ewprintf("Internal error in Undo!"); |
| 551 | rval = FALSE0; |
| 552 | break; |
| 553 | } |
| 554 | curwp->w_dotp = lp; |
| 555 | curwp->w_doto = offset; |
| 556 | curwp->w_markline = curwp->w_dotline; |
| 557 | curwp->w_dotline = lineno; |
| 558 | } |
| 559 | |
| 560 | /* |
| 561 | * Do operation^-1 |
| 562 | */ |
| 563 | switch (ptr->type) { |
| 564 | case INSERT: |
| 565 | ldelete(ptr->region.r_size, KNONE0x00); |
| 566 | break; |
| 567 | case DELETE: |
| 568 | lp = curwp->w_dotp; |
| 569 | offset = curwp->w_doto; |
| 570 | region_put_data(ptr->content, |
| 571 | ptr->region.r_size); |
| 572 | curwp->w_dotp = lp; |
| 573 | curwp->w_doto = offset; |
| 574 | break; |
| 575 | case DELREG: |
| 576 | region_put_data(ptr->content, |
| 577 | ptr->region.r_size); |
| 578 | break; |
| 579 | case BOUNDARY: |
| 580 | done = 1; |
| 581 | break; |
| 582 | case MODIFIED: |
| 583 | curbp->b_flag &= ~BFCHG0x01; |
| 584 | break; |
| 585 | default: |
| 586 | break; |
| 587 | } |
| 588 | |
| 589 | /* And move to next record */ |
| 590 | ptr = TAILQ_NEXT(ptr, next)((ptr)->next.tqe_next); |
| 591 | } while (ptr != NULL((void *)0) && !done); |
| 592 | |
| 593 | boundary_flag = save; |
| 594 | undo_add_boundary(FFRAND8, 1); |
| 595 | |
| 596 | ewprintf("Undo!"); |
| 597 | } |
| 598 | |
| 599 | curbp->b_undoptr = ptr; |
| 600 | |
| 601 | return (rval); |
| 602 | } |