common/log.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "$Id: log.c,v 10.9 1996/12/11 13:03:05 bostic Exp $ (Berkeley) $Date: 1996/12/11 13:03:05 $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/stat.h>
  19
  20 #include <bitstring.h>
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <limits.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 #include "common.h"
  29
  30 /*
  31  * The log consists of records, each containing a type byte and a variable
  32  * length byte string, as follows:
  33  *
  34  *      LOG_CURSOR_INIT         MARK
  35  *      LOG_CURSOR_END          MARK
  36  *      LOG_LINE_APPEND         recno_t         char *
  37  *      LOG_LINE_DELETE         recno_t         char *
  38  *      LOG_LINE_INSERT         recno_t         char *
  39  *      LOG_LINE_RESET_F        recno_t         char *
  40  *      LOG_LINE_RESET_B        recno_t         char *
  41  *      LOG_MARK                LMARK
  42  *
  43  * We do before image physical logging.  This means that the editor layer
  44  * MAY NOT modify records in place, even if simply deleting or overwriting
  45  * characters.  Since the smallest unit of logging is a line, we're using
  46  * up lots of space.  This may eventually have to be reduced, probably by
  47  * doing logical logging, which is a much cooler database phrase.
  48  *
  49  * The implementation of the historic vi 'u' command, using roll-forward and
  50  * roll-back, is simple.  Each set of changes has a LOG_CURSOR_INIT record,
  51  * followed by a number of other records, followed by a LOG_CURSOR_END record.
  52  * LOG_LINE_RESET records come in pairs.  The first is a LOG_LINE_RESET_B
  53  * record, and is the line before the change.  The second is LOG_LINE_RESET_F,
  54  * and is the line after the change.  Roll-back is done by backing up to the
  55  * first LOG_CURSOR_INIT record before a change.  Roll-forward is done in a
  56  * similar fashion.
  57  *
  58  * The 'U' command is implemented by rolling backward to a LOG_CURSOR_END
  59  * record for a line different from the current one.  It should be noted that
  60  * this means that a subsequent 'u' command will make a change based on the
  61  * new position of the log's cursor.  This is okay, and, in fact, historic vi
  62  * behaved that way.
  63  */
  64
  65 static int      log_cursor1 __P((SCR *, int));
  66 static void     log_err __P((SCR *, char *, int));
  67 #if defined(DEBUG) && 0
  68 static void     log_trace __P((SCR *, char *, recno_t, u_char *));
  69 #endif
  70
  71 /* Try and restart the log on failure, i.e. if we run out of memory. */
  72 #define LOG_ERR {                                                       \
  73         log_err(sp, __FILE__, __LINE__);                                \
  74         return (1);                                                     \
  75 }
  76
  77 /*
  78  * log_init --
  79  *      Initialize the logging subsystem.
  80  *
  81  * PUBLIC: int log_init __P((SCR *, EXF *));
  82  */
  83 int
  84 log_init(sp, ep)
  85         SCR *sp;
  86         EXF *ep;
  87 {
  88         /*
  89          * !!!
  90          * ep MAY NOT BE THE SAME AS sp->ep, DON'T USE THE LATTER.
  91          *
  92          * Initialize the buffer.  The logging subsystem has its own
  93          * buffers because the global ones are almost by definition
  94          * going to be in use when the log runs.
  95          */
  96         ep->l_lp = NULL;
  97         ep->l_len = 0;
  98         ep->l_cursor.lno = 1;           /* XXX Any valid recno. */
  99         ep->l_cursor.cno = 0;
 100         ep->l_high = ep->l_cur = 1;
 101
 102         ep->log = dbopen(NULL, O_CREAT | O_NONBLOCK | O_RDWR,
 103             S_IRUSR | S_IWUSR, DB_RECNO, NULL);
 104         if (ep->log == NULL) {
 105                 msgq(sp, M_SYSERR, "009|Log file");
 106                 F_SET(ep, F_NOLOG);
 107                 return (1);
 108         }
 109
 110         return (0);
 111 }
 112
 113 /*
 114  * log_end --
 115  *      Close the logging subsystem.
 116  *
 117  * PUBLIC: int log_end __P((SCR *, EXF *));
 118  */
 119 int
 120 log_end(sp, ep)
 121         SCR *sp;
 122         EXF *ep;
 123 {
 124         /*
 125          * !!!
 126          * ep MAY NOT BE THE SAME AS sp->ep, DON'T USE THE LATTER.
 127          */
 128         if (ep->log != NULL) {
 129                 (void)(ep->log->close)(ep->log);
 130                 ep->log = NULL;
 131         }
 132         if (ep->l_lp != NULL) {
 133                 free(ep->l_lp);
 134                 ep->l_lp = NULL;
 135         }
 136         ep->l_len = 0;
 137         ep->l_cursor.lno = 1;           /* XXX Any valid recno. */
 138         ep->l_cursor.cno = 0;
 139         ep->l_high = ep->l_cur = 1;
 140         return (0);
 141 }
 142
 143 /*
 144  * log_cursor --
 145  *      Log the current cursor position, starting an event.
 146  *
 147  * PUBLIC: int log_cursor __P((SCR *));
 148  */
 149 int
 150 log_cursor(sp)
 151         SCR *sp;
 152 {
 153         EXF *ep;
 154
 155         ep = sp->ep;
 156         if (F_ISSET(ep, F_NOLOG))
 157                 return (0);
 158
 159         /*
 160          * If any changes were made since the last cursor init,
 161          * put out the ending cursor record.
 162          */
 163         if (ep->l_cursor.lno == OOBLNO) {
 164                 ep->l_cursor.lno = sp->lno;
 165                 ep->l_cursor.cno = sp->cno;
 166                 return (log_cursor1(sp, LOG_CURSOR_END));
 167         }
 168         ep->l_cursor.lno = sp->lno;
 169         ep->l_cursor.cno = sp->cno;
 170         return (0);
 171 }
 172
 173 /*
 174  * log_cursor1 --
 175  *      Actually push a cursor record out.
 176  */
 177 static int
 178 log_cursor1(sp, type)
 179         SCR *sp;
 180         int type;
 181 {
 182         DBT data, key;
 183         EXF *ep;
 184
 185         ep = sp->ep;
 186         BINC_RET(sp, ep->l_lp, ep->l_len, sizeof(u_char) + sizeof(MARK));
 187         ep->l_lp[0] = type;
 188         memmove(ep->l_lp + sizeof(u_char), &ep->l_cursor, sizeof(MARK));
 189
 190         key.data = &ep->l_cur;
 191         key.size = sizeof(recno_t);
 192         data.data = ep->l_lp;
 193         data.size = sizeof(u_char) + sizeof(MARK);
 194         if (ep->log->put(ep->log, &key, &data, 0) == -1)
 195                 LOG_ERR;
 196
 197 #if defined(DEBUG) && 0
 198         trace(sp, "%lu: %s: %u/%u\n", ep->l_cur,
 199             type == LOG_CURSOR_INIT ? "log_cursor_init" : "log_cursor_end",
 200             sp->lno, sp->cno);
 201 #endif
 202         /* Reset high water mark. */
 203         ep->l_high = ++ep->l_cur;
 204
 205         return (0);
 206 }
 207
 208 /*
 209  * log_line --
 210  *      Log a line change.
 211  *
 212  * PUBLIC: int log_line __P((SCR *, recno_t, u_int));
 213  */
 214 int
 215 log_line(sp, lno, action)
 216         SCR *sp;
 217         recno_t lno;
 218         u_int action;
 219 {
 220         DBT data, key;
 221         EXF *ep;
 222         size_t len;
 223         char *lp;
 224
 225         ep = sp->ep;
 226         if (F_ISSET(ep, F_NOLOG))
 227                 return (0);
 228
 229         /*
 230          * XXX
 231          *
 232          * Kluge for vi.  Clear the EXF undo flag so that the
 233          * next 'u' command does a roll-back, regardless.
 234          */
 235         F_CLR(ep, F_UNDO);
 236
 237         /* Put out one initial cursor record per set of changes. */
 238         if (ep->l_cursor.lno != OOBLNO) {
 239                 if (log_cursor1(sp, LOG_CURSOR_INIT))
 240                         return (1);
 241                 ep->l_cursor.lno = OOBLNO;
 242         }
 243
 244         /*
 245          * Put out the changes.  If it's a LOG_LINE_RESET_B call, it's a
 246          * special case, avoid the caches.  Also, if it fails and it's
 247          * line 1, it just means that the user started with an empty file,
 248          * so fake an empty length line.
 249          */
 250         if (action == LOG_LINE_RESET_B) {
 251                 if (db_get(sp, lno, DBG_NOCACHE, &lp, &len)) {
 252                         if (lno != 1) {
 253                                 db_err(sp, lno);
 254                                 return (1);
 255                         }
 256                         len = 0;
 257                         lp = "";
 258                 }
 259         } else
 260                 if (db_get(sp, lno, DBG_FATAL, &lp, &len))
 261                         return (1);
 262         BINC_RET(sp,
 263             ep->l_lp, ep->l_len, len + sizeof(u_char) + sizeof(recno_t));
 264         ep->l_lp[0] = action;
 265         memmove(ep->l_lp + sizeof(u_char), &lno, sizeof(recno_t));
 266         memmove(ep->l_lp + sizeof(u_char) + sizeof(recno_t), lp, len);
 267
 268         key.data = &ep->l_cur;
 269         key.size = sizeof(recno_t);
 270         data.data = ep->l_lp;
 271         data.size = len + sizeof(u_char) + sizeof(recno_t);
 272         if (ep->log->put(ep->log, &key, &data, 0) == -1)
 273                 LOG_ERR;
 274
 275 #if defined(DEBUG) && 0
 276         switch (action) {
 277         case LOG_LINE_APPEND:
 278                 trace(sp, "%u: log_line: append: %lu {%u}\n",
 279                     ep->l_cur, lno, len);
 280                 break;
 281         case LOG_LINE_DELETE:
 282                 trace(sp, "%lu: log_line: delete: %lu {%u}\n",
 283                     ep->l_cur, lno, len);
 284                 break;
 285         case LOG_LINE_INSERT:
 286                 trace(sp, "%lu: log_line: insert: %lu {%u}\n",
 287                     ep->l_cur, lno, len);
 288                 break;
 289         case LOG_LINE_RESET_F:
 290                 trace(sp, "%lu: log_line: reset_f: %lu {%u}\n",
 291                     ep->l_cur, lno, len);
 292                 break;
 293         case LOG_LINE_RESET_B:
 294                 trace(sp, "%lu: log_line: reset_b: %lu {%u}\n",
 295                     ep->l_cur, lno, len);
 296                 break;
 297         }
 298 #endif
 299         /* Reset high water mark. */
 300         ep->l_high = ++ep->l_cur;
 301
 302         return (0);
 303 }
 304
 305 /*
 306  * log_mark --
 307  *      Log a mark position.  For the log to work, we assume that there
 308  *      aren't any operations that just put out a log record -- this
 309  *      would mean that undo operations would only reset marks, and not
 310  *      cause any other change.
 311  *
 312  * PUBLIC: int log_mark __P((SCR *, LMARK *));
 313  */
 314 int
 315 log_mark(sp, lmp)
 316         SCR *sp;
 317         LMARK *lmp;
 318 {
 319         DBT data, key;
 320         EXF *ep;
 321
 322         ep = sp->ep;
 323         if (F_ISSET(ep, F_NOLOG))
 324                 return (0);
 325
 326         /* Put out one initial cursor record per set of changes. */
 327         if (ep->l_cursor.lno != OOBLNO) {
 328                 if (log_cursor1(sp, LOG_CURSOR_INIT))
 329                         return (1);
 330                 ep->l_cursor.lno = OOBLNO;
 331         }
 332
 333         BINC_RET(sp, ep->l_lp,
 334             ep->l_len, sizeof(u_char) + sizeof(LMARK));
 335         ep->l_lp[0] = LOG_MARK;
 336         memmove(ep->l_lp + sizeof(u_char), lmp, sizeof(LMARK));
 337
 338         key.data = &ep->l_cur;
 339         key.size = sizeof(recno_t);
 340         data.data = ep->l_lp;
 341         data.size = sizeof(u_char) + sizeof(LMARK);
 342         if (ep->log->put(ep->log, &key, &data, 0) == -1)
 343                 LOG_ERR;
 344
 345 #if defined(DEBUG) && 0
 346         trace(sp, "%lu: mark %c: %lu/%u\n",
 347             ep->l_cur, lmp->name, lmp->lno, lmp->cno);
 348 #endif
 349         /* Reset high water mark. */
 350         ep->l_high = ++ep->l_cur;
 351         return (0);
 352 }
 353
 354 /*
 355  * Log_backward --
 356  *      Roll the log backward one operation.
 357  *
 358  * PUBLIC: int log_backward __P((SCR *, MARK *));
 359  */
 360 int
 361 log_backward(sp, rp)
 362         SCR *sp;
 363         MARK *rp;
 364 {
 365         DBT key, data;
 366         EXF *ep;
 367         LMARK lm;
 368         MARK m;
 369         recno_t lno;
 370         int didop;
 371         u_char *p;
 372
 373         ep = sp->ep;
 374         if (F_ISSET(ep, F_NOLOG)) {
 375                 msgq(sp, M_ERR,
 376                     "010|Logging not being performed, undo not possible");
 377                 return (1);
 378         }
 379
 380         if (ep->l_cur == 1) {
 381                 msgq(sp, M_BERR, "011|No changes to undo");
 382                 return (1);
 383         }
 384
 385         F_SET(ep, F_NOLOG);             /* Turn off logging. */
 386
 387         key.data = &ep->l_cur;          /* Initialize db request. */
 388         key.size = sizeof(recno_t);
 389         for (didop = 0;;) {
 390                 --ep->l_cur;
 391                 if (ep->log->get(ep->log, &key, &data, 0))
 392                         LOG_ERR;
 393 #if defined(DEBUG) && 0
 394                 log_trace(sp, "log_backward", ep->l_cur, data.data);
 395 #endif
 396                 switch (*(p = (u_char *)data.data)) {
 397                 case LOG_CURSOR_INIT:
 398                         if (didop) {
 399                                 memmove(rp, p + sizeof(u_char), sizeof(MARK));
 400                                 F_CLR(ep, F_NOLOG);
 401                                 return (0);
 402                         }
 403                         break;
 404                 case LOG_CURSOR_END:
 405                         break;
 406                 case LOG_LINE_APPEND:
 407                 case LOG_LINE_INSERT:
 408                         didop = 1;
 409                         memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 410                         if (db_delete(sp, lno))
 411                                 goto err;
 412                         ++sp->rptlines[L_DELETED];
 413                         break;
 414                 case LOG_LINE_DELETE:
 415                         didop = 1;
 416                         memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 417                         if (db_insert(sp, lno, p + sizeof(u_char) +
 418                             sizeof(recno_t), data.size - sizeof(u_char) -
 419                             sizeof(recno_t)))
 420                                 goto err;
 421                         ++sp->rptlines[L_ADDED];
 422                         break;
 423                 case LOG_LINE_RESET_F:
 424                         break;
 425                 case LOG_LINE_RESET_B:
 426                         didop = 1;
 427                         memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 428                         if (db_set(sp, lno, p + sizeof(u_char) +
 429                             sizeof(recno_t), data.size - sizeof(u_char) -
 430                             sizeof(recno_t)))
 431                                 goto err;
 432                         if (sp->rptlchange != lno) {
 433                                 sp->rptlchange = lno;
 434                                 ++sp->rptlines[L_CHANGED];
 435                         }
 436                         break;
 437                 case LOG_MARK:
 438                         didop = 1;
 439                         memmove(&lm, p + sizeof(u_char), sizeof(LMARK));
 440                         m.lno = lm.lno;
 441                         m.cno = lm.cno;
 442                         if (mark_set(sp, lm.name, &m, 0))
 443                                 goto err;
 444                         break;
 445                 default:
 446                         abort();
 447                 }
 448         }
 449
 450 err:    F_CLR(ep, F_NOLOG);
 451         return (1);
 452 }
 453
 454 /*
 455  * Log_setline --
 456  *      Reset the line to its original appearance.
 457  *
 458  * XXX
 459  * There's a bug in this code due to our not logging cursor movements
 460  * unless a change was made.  If you do a change, move off the line,
 461  * then move back on and do a 'U', the line will be restored to the way
 462  * it was before the original change.
 463  *
 464  * PUBLIC: int log_setline __P((SCR *));
 465  */
 466 int
 467 log_setline(sp)
 468         SCR *sp;
 469 {
 470         DBT key, data;
 471         EXF *ep;
 472         LMARK lm;
 473         MARK m;
 474         recno_t lno;
 475         u_char *p;
 476
 477         ep = sp->ep;
 478         if (F_ISSET(ep, F_NOLOG)) {
 479                 msgq(sp, M_ERR,
 480                     "012|Logging not being performed, undo not possible");
 481                 return (1);
 482         }
 483
 484         if (ep->l_cur == 1)
 485                 return (1);
 486
 487         F_SET(ep, F_NOLOG);             /* Turn off logging. */
 488
 489         key.data = &ep->l_cur;          /* Initialize db request. */
 490         key.size = sizeof(recno_t);
 491
 492         for (;;) {
 493                 --ep->l_cur;
 494                 if (ep->log->get(ep->log, &key, &data, 0))
 495                         LOG_ERR;
 496 #if defined(DEBUG) && 0
 497                 log_trace(sp, "log_setline", ep->l_cur, data.data);
 498 #endif
 499                 switch (*(p = (u_char *)data.data)) {
 500                 case LOG_CURSOR_INIT:
 501                         memmove(&m, p + sizeof(u_char), sizeof(MARK));
 502                         if (m.lno != sp->lno || ep->l_cur == 1) {
 503                                 F_CLR(ep, F_NOLOG);
 504                                 return (0);
 505                         }
 506                         break;
 507                 case LOG_CURSOR_END:
 508                         memmove(&m, p + sizeof(u_char), sizeof(MARK));
 509                         if (m.lno != sp->lno) {
 510                                 ++ep->l_cur;
 511                                 F_CLR(ep, F_NOLOG);
 512                                 return (0);
 513                         }
 514                         break;
 515                 case LOG_LINE_APPEND:
 516                 case LOG_LINE_INSERT:
 517                 case LOG_LINE_DELETE:
 518                 case LOG_LINE_RESET_F:
 519                         break;
 520                 case LOG_LINE_RESET_B:
 521                         memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 522                         if (lno == sp->lno &&
 523                             db_set(sp, lno, p + sizeof(u_char) +
 524                             sizeof(recno_t), data.size - sizeof(u_char) -
 525                             sizeof(recno_t)))
 526                                 goto err;
 527                         if (sp->rptlchange != lno) {
 528                                 sp->rptlchange = lno;
 529                                 ++sp->rptlines[L_CHANGED];
 530                         }
 531                 case LOG_MARK:
 532                         memmove(&lm, p + sizeof(u_char), sizeof(LMARK));
 533                         m.lno = lm.lno;
 534                         m.cno = lm.cno;
 535                         if (mark_set(sp, lm.name, &m, 0))
 536                                 goto err;
 537                         break;
 538                 default:
 539                         abort();
 540                 }
 541         }
 542
 543 err:    F_CLR(ep, F_NOLOG);
 544         return (1);
 545 }
 546
 547 /*
 548  * Log_forward --
 549  *      Roll the log forward one operation.
 550  *
 551  * PUBLIC: int log_forward __P((SCR *, MARK *));
 552  */
 553 int
 554 log_forward(sp, rp)
 555         SCR *sp;
 556         MARK *rp;
 557 {
 558         DBT key, data;
 559         EXF *ep;
 560         LMARK lm;
 561         MARK m;
 562         recno_t lno;
 563         int didop;
 564         u_char *p;
 565
 566         ep = sp->ep;
 567         if (F_ISSET(ep, F_NOLOG)) {
 568                 msgq(sp, M_ERR,
 569             "013|Logging not being performed, roll-forward not possible");
 570                 return (1);
 571         }
 572
 573         if (ep->l_cur == ep->l_high) {
 574                 msgq(sp, M_BERR, "014|No changes to re-do");
 575                 return (1);
 576         }
 577
 578         F_SET(ep, F_NOLOG);             /* Turn off logging. */
 579
 580         key.data = &ep->l_cur;          /* Initialize db request. */
 581         key.size = sizeof(recno_t);
 582         for (didop = 0;;) {
 583                 ++ep->l_cur;
 584                 if (ep->log->get(ep->log, &key, &data, 0))
 585                         LOG_ERR;
 586 #if defined(DEBUG) && 0
 587                 log_trace(sp, "log_forward", ep->l_cur, data.data);
 588 #endif
 589                 switch (*(p = (u_char *)data.data)) {
 590                 case LOG_CURSOR_END:
 591                         if (didop) {
 592                                 ++ep->l_cur;
 593                                 memmove(rp, p + sizeof(u_char), sizeof(MARK));
 594                                 F_CLR(ep, F_NOLOG);
 595                                 return (0);
 596                         }
 597                         break;
 598                 case LOG_CURSOR_INIT:
 599                         break;
 600                 case LOG_LINE_APPEND:
 601                 case LOG_LINE_INSERT:
 602                         didop = 1;
 603                         memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 604                         if (db_insert(sp, lno, p + sizeof(u_char) +
 605                             sizeof(recno_t), data.size - sizeof(u_char) -
 606                             sizeof(recno_t)))
 607                                 goto err;
 608                         ++sp->rptlines[L_ADDED];
 609                         break;
 610                 case LOG_LINE_DELETE:
 611                         didop = 1;
 612                         memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 613                         if (db_delete(sp, lno))
 614                                 goto err;
 615                         ++sp->rptlines[L_DELETED];
 616                         break;
 617                 case LOG_LINE_RESET_B:
 618                         break;
 619                 case LOG_LINE_RESET_F:
 620                         didop = 1;
 621                         memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 622                         if (db_set(sp, lno, p + sizeof(u_char) +
 623                             sizeof(recno_t), data.size - sizeof(u_char) -
 624                             sizeof(recno_t)))
 625                                 goto err;
 626                         if (sp->rptlchange != lno) {
 627                                 sp->rptlchange = lno;
 628                                 ++sp->rptlines[L_CHANGED];
 629                         }
 630                         break;
 631                 case LOG_MARK:
 632                         didop = 1;
 633                         memmove(&lm, p + sizeof(u_char), sizeof(LMARK));
 634                         m.lno = lm.lno;
 635                         m.cno = lm.cno;
 636                         if (mark_set(sp, lm.name, &m, 0))
 637                                 goto err;
 638                         break;
 639                 default:
 640                         abort();
 641                 }
 642         }
 643
 644 err:    F_CLR(ep, F_NOLOG);
 645         return (1);
 646 }
 647
 648 /*
 649  * log_err --
 650  *      Try and restart the log on failure, i.e. if we run out of memory.
 651  */
 652 static void
 653 log_err(sp, file, line)
 654         SCR *sp;
 655         char *file;
 656         int line;
 657 {
 658         EXF *ep;
 659
 660         msgq(sp, M_SYSERR, "015|%s/%d: log put error", tail(file), line);
 661         ep = sp->ep;
 662         (void)ep->log->close(ep->log);
 663         if (!log_init(sp, ep))
 664                 msgq(sp, M_ERR, "267|Log restarted");
 665 }
 666
 667 #if defined(DEBUG) && 0
 668 static void
 669 log_trace(sp, msg, rno, p)
 670         SCR *sp;
 671         char *msg;
 672         recno_t rno;
 673         u_char *p;
 674 {
 675         LMARK lm;
 676         MARK m;
 677         recno_t lno;
 678
 679         switch (*p) {
 680         case LOG_CURSOR_INIT:
 681                 memmove(&m, p + sizeof(u_char), sizeof(MARK));
 682                 trace(sp, "%lu: %s:  C_INIT: %u/%u\n", rno, msg, m.lno, m.cno);
 683                 break;
 684         case LOG_CURSOR_END:
 685                 memmove(&m, p + sizeof(u_char), sizeof(MARK));
 686                 trace(sp, "%lu: %s:   C_END: %u/%u\n", rno, msg, m.lno, m.cno);
 687                 break;
 688         case LOG_LINE_APPEND:
 689                 memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 690                 trace(sp, "%lu: %s:  APPEND: %lu\n", rno, msg, lno);
 691                 break;
 692         case LOG_LINE_INSERT:
 693                 memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 694                 trace(sp, "%lu: %s:  INSERT: %lu\n", rno, msg, lno);
 695                 break;
 696         case LOG_LINE_DELETE:
 697                 memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 698                 trace(sp, "%lu: %s:  DELETE: %lu\n", rno, msg, lno);
 699                 break;
 700         case LOG_LINE_RESET_F:
 701                 memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 702                 trace(sp, "%lu: %s: RESET_F: %lu\n", rno, msg, lno);
 703                 break;
 704         case LOG_LINE_RESET_B:
 705                 memmove(&lno, p + sizeof(u_char), sizeof(recno_t));
 706                 trace(sp, "%lu: %s: RESET_B: %lu\n", rno, msg, lno);
 707                 break;
 708         case LOG_MARK:
 709                 memmove(&lm, p + sizeof(u_char), sizeof(LMARK));
 710                 trace(sp,
 711                     "%lu: %s:    MARK: %u/%u\n", rno, msg, lm.lno, lm.cno);
 712                 break;
 713         default:
 714                 abort();
 715         }
 716 }
 717 #endif