external/bsd/nvi/dist/common/log1.c

   1 /*      $NetBSD: log1.c,v 1.3 2013/11/29 16:36:11 christos Exp $        */
   2 /*-
   3  * Copyright (c) 1992, 1993, 1994
   4  *      The Regents of the University of California.  All rights reserved.
   5  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   6  *      Keith Bostic.  All rights reserved.
   7  *
   8  * See the LICENSE file for redistribution information.
   9  */
  10
  11 #include "config.h"
  12
  13 #ifndef lint
  14 static const char sccsid[] = "Id: log.c,v 10.26 2002/03/02 23:12:13 skimo Exp  (Berkeley) Date: 2002/03/02 23:12:13 ";
  15 #endif /* not lint */
  16
  17 #include <sys/types.h>
  18 #include <sys/queue.h>
  19 #include <sys/stat.h>
  20
  21 #include <bitstring.h>
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <limits.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include "common.h"
  30
  31 /*
  32  * The log consists of records, each containing a type byte and a variable
  33  * length byte string, as follows:
  34  *
  35  *      LOG_CURSOR_INIT         MARK
  36  *      LOG_CURSOR_END          MARK
  37  *      LOG_LINE_APPEND_F       db_recno_t              char *
  38  *      LOG_LINE_APPEND_B       db_recno_t              char *
  39  *      LOG_LINE_DELETE_F       db_recno_t              char *
  40  *      LOG_LINE_DELETE_B       db_recno_t              char *
  41  *      LOG_LINE_RESET_F        db_recno_t              char *
  42  *      LOG_LINE_RESET_B        db_recno_t              char *
  43  *      LOG_MARK                LMARK
  44  *
  45  * We do before image physical logging.  This means that the editor layer
  46  * MAY NOT modify records in place, even if simply deleting or overwriting
  47  * characters.  Since the smallest unit of logging is a line, we're using
  48  * up lots of space.  This may eventually have to be reduced, probably by
  49  * doing logical logging, which is a much cooler database phrase.
  50  *
  51  * The implementation of the historic vi 'u' command, using roll-forward and
  52  * roll-back, is simple.  Each set of changes has a LOG_CURSOR_INIT record,
  53  * followed by a number of other records, followed by a LOG_CURSOR_END record.
  54  * LOG_LINE_RESET records come in pairs.  The first is a LOG_LINE_RESET_B
  55  * record, and is the line before the change.  The second is LOG_LINE_RESET_F,
  56  * and is the line after the change.  Roll-back is done by backing up to the
  57  * first LOG_CURSOR_INIT record before a change.  Roll-forward is done in a
  58  * similar fashion.
  59  *
  60  * The 'U' command is implemented by rolling backward to a LOG_CURSOR_END
  61  * record for a line different from the current one.  It should be noted that
  62  * this means that a subsequent 'u' command will make a change based on the
  63  * new position of the log's cursor.  This is okay, and, in fact, historic vi
  64  * behaved that way.
  65  */
  66
  67 static int      log_cursor1 __P((SCR *, int));
  68 static void     log_err __P((SCR *, const char *, int));
  69 #if defined(LOGDEBUG) && defined(TRACE)
  70 static void     log_trace __P((SCR *, const char *, db_recno_t, u_char *));
  71 #endif
  72
  73 /* Try and restart the log on failure, i.e. if we run out of memory. */
  74 #define LOG_ERR {                                                       \
  75         log_err(sp, __FILE__, __LINE__);                                \
  76         return (1);                                                     \
  77 }
  78
  79 /* offset of CHAR_T string in log needs to be aligned on some systems
  80  * because it is passed to db_set as a string
  81  */
  82 typedef struct {
  83     char    data[sizeof(u_char) /* type */ + sizeof(db_recno_t)];
  84     CHAR_T  str[1];
  85 } log_t;
  86 #define CHAR_T_OFFSET ((char *)(((log_t*)0)->str) - (char *)0)
  87
  88 /*
  89  * log_init --
  90  *      Initialize the logging subsystem.
  91  *
  92  * PUBLIC: int log_init __P((SCR *, EXF *));
  93  */
  94 int
  95 log_init(SCR *sp, EXF *ep)
  96 {
  97         /*
  98          * !!!
  99          * ep MAY NOT BE THE SAME AS sp->ep, DON'T USE THE LATTER.
 100          *
 101          * Initialize the buffer.  The logging subsystem has its own
 102          * buffers because the global ones are almost by definition
 103          * going to be in use when the log runs.
 104          */
 105         sp->wp->l_lp = NULL;
 106         sp->wp->l_len = 0;
 107         ep->l_cursor.lno = 1;           /* XXX Any valid recno. */
 108         ep->l_cursor.cno = 0;
 109         ep->l_high = ep->l_cur = 1;
 110
 111         ep->log = dbopen(NULL, O_CREAT | O_NONBLOCK | O_RDWR,
 112             S_IRUSR | S_IWUSR, DB_RECNO, NULL);
 113         if (ep->log == NULL) {
 114                 msgq(sp, M_SYSERR, "009|Log file");
 115                 F_SET(ep, F_NOLOG);
 116                 return (1);
 117         }
 118
 119         ep->l_win = NULL;
 120         /*LOCK_INIT(sp->wp, ep);*/
 121
 122         return (0);
 123 }
 124
 125 /*
 126  * log_end --
 127  *      Close the logging subsystem.
 128  *
 129  * PUBLIC: int log_end __P((SCR *, EXF *));
 130  */
 131 int
 132 log_end(SCR *sp, EXF *ep)
 133 {
 134         /*
 135          * !!!
 136          * ep MAY NOT BE THE SAME AS sp->ep, DON'T USE THE LATTER.
 137          */
 138         /*LOCK_END(sp->wp, ep);*/
 139         if (ep->log != NULL) {
 140                 (void)(ep->log->close)(ep->log);
 141                 ep->log = NULL;
 142         }
 143         if (sp->wp->l_lp != NULL) {
 144                 free(sp->wp->l_lp);
 145                 sp->wp->l_lp = NULL;
 146         }
 147         sp->wp->l_len = 0;
 148         ep->l_cursor.lno = 1;           /* XXX Any valid recno. */
 149         ep->l_cursor.cno = 0;
 150         ep->l_high = ep->l_cur = 1;
 151         return (0);
 152 }
 153
 154 /*
 155  * log_cursor --
 156  *      Log the current cursor position, starting an event.
 157  *
 158  * PUBLIC: int log_cursor __P((SCR *));
 159  */
 160 int
 161 log_cursor(SCR *sp)
 162 {
 163         EXF *ep;
 164
 165         ep = sp->ep;
 166         if (F_ISSET(ep, F_NOLOG))
 167                 return (0);
 168
 169         /*
 170          * If any changes were made since the last cursor init,
 171          * put out the ending cursor record.
 172          */
 173         if (ep->l_cursor.lno == OOBLNO) {
 174                 if (ep->l_win && ep->l_win != sp->wp)
 175                         return 0;
 176                 ep->l_cursor.lno = sp->lno;
 177                 ep->l_cursor.cno = sp->cno;
 178                 ep->l_win = NULL;
 179                 return (log_cursor1(sp, LOG_CURSOR_END));
 180         }
 181         ep->l_cursor.lno = sp->lno;
 182         ep->l_cursor.cno = sp->cno;
 183         return (0);
 184 }
 185
 186 /*
 187  * log_cursor1 --
 188  *      Actually push a cursor record out.
 189  */
 190 static int
 191 log_cursor1(SCR *sp, int type)
 192 {
 193         DBT data, key;
 194         EXF *ep;
 195
 196         ep = sp->ep;
 197
 198         /*
 199         if (type == LOG_CURSOR_INIT &&
 200             LOCK_TRY(sp->wp, ep))
 201                 return 1;
 202         */
 203
 204         BINC_RETC(sp, sp->wp->l_lp, sp->wp->l_len, sizeof(u_char) + sizeof(MARK));
 205         sp->wp->l_lp[0] = type;
 206         memmove(sp->wp->l_lp + sizeof(u_char), &ep->l_cursor, sizeof(MARK));
 207
 208         memset(&key, 0, sizeof(key));
 209         key.data = &ep->l_cur;
 210         key.size = sizeof(db_recno_t);
 211         memset(&data, 0, sizeof(data));
 212         data.data = sp->wp->l_lp;
 213         data.size = sizeof(u_char) + sizeof(MARK);
 214         if (ep->log->put(ep->log, &key, &data, 0) == -1)
 215                 LOG_ERR;
 216
 217 #if defined(LOGDEBUG) && defined(TRACE)
 218         vtrace("%lu: %s: %u/%u\n", ep->l_cur,
 219             type == LOG_CURSOR_INIT ? "log_cursor_init" : "log_cursor_end",
 220             sp->lno, sp->cno);
 221 #endif
 222         /* Reset high water mark. */
 223         ep->l_high = ++ep->l_cur;
 224
 225         /*
 226         if (type == LOG_CURSOR_END)
 227                 LOCK_UNLOCK(sp->wp, ep);
 228         */
 229         return (0);
 230 }
 231
 232 /*
 233  * log_line --
 234  *      Log a line change.
 235  *
 236  * PUBLIC: int log_line __P((SCR *, db_recno_t, u_int));
 237  */
 238 int
 239 log_line(SCR *sp, db_recno_t lno, u_int action)
 240 {
 241         DBT data, key;
 242         EXF *ep;
 243         size_t len;
 244         CHAR_T *lp;
 245         db_recno_t lcur;
 246
 247         ep = sp->ep;
 248         if (F_ISSET(ep, F_NOLOG))
 249                 return (0);
 250
 251         /*
 252          * XXX
 253          *
 254          * Kluge for vi.  Clear the EXF undo flag so that the
 255          * next 'u' command does a roll-back, regardless.
 256          */
 257         F_CLR(ep, F_UNDO);
 258
 259         /* Put out one initial cursor record per set of changes. */
 260         if (ep->l_cursor.lno != OOBLNO) {
 261                 if (log_cursor1(sp, LOG_CURSOR_INIT))
 262                         return (1);
 263                 ep->l_cursor.lno = OOBLNO;
 264                 ep->l_win = sp->wp;
 265         } /*else if (ep->l_win != sp->wp) {
 266                 printf("log_line own: %p, this: %p\n", ep->l_win, sp->wp);
 267                 return 1;
 268         }*/
 269
 270         switch (action) {
 271         /* newly added for DB4 logging */
 272         case LOG_LINE_APPEND_B:
 273         case LOG_LINE_DELETE_F:
 274                 return 0;
 275         }
 276
 277         /*
 278          * Put out the changes.  If it's a LOG_LINE_RESET_B call, it's a
 279          * special case, avoid the caches.  Also, if it fails and it's
 280          * line 1, it just means that the user started with an empty file,
 281          * so fake an empty length line.
 282          */
 283         if (action == LOG_LINE_RESET_B) {
 284                 if (db_get(sp, lno, DBG_NOCACHE, &lp, &len)) {
 285                         static CHAR_T nul = 0;
 286                         if (lno != 1) {
 287                                 db_err(sp, lno);
 288                                 return (1);
 289                         }
 290                         len = 0;
 291                         lp = &nul;
 292                 }
 293         } else
 294                 if (db_get(sp, lno, DBG_FATAL, &lp, &len))
 295                         return (1);
 296         BINC_RETC(sp,
 297             sp->wp->l_lp, sp->wp->l_len,
 298             len * sizeof(CHAR_T) + CHAR_T_OFFSET);
 299         sp->wp->l_lp[0] = action;
 300         memmove(sp->wp->l_lp + sizeof(u_char), &lno, sizeof(db_recno_t));
 301         MEMMOVEW(sp->wp->l_lp + CHAR_T_OFFSET, lp, len);
 302
 303         lcur = ep->l_cur;
 304         memset(&key, 0, sizeof(key));
 305         key.data = &lcur;
 306         key.size = sizeof(db_recno_t);
 307         memset(&data, 0, sizeof(data));
 308         data.data = sp->wp->l_lp;
 309         data.size = len * sizeof(CHAR_T) + CHAR_T_OFFSET;
 310         if (ep->log->put(ep->log, &key, &data, 0) == -1)
 311                 LOG_ERR;
 312
 313 #if defined(LOGDEBUG) && defined(TRACE)
 314         switch (action) {
 315         case LOG_LINE_APPEND_F:
 316                 vtrace("%u: log_line: append_f: %lu {%u}\n",
 317                     ep->l_cur, lno, len);
 318                 break;
 319         case LOG_LINE_APPEND_B:
 320                 vtrace("%u: log_line: append_b: %lu {%u}\n",
 321                     ep->l_cur, lno, len);
 322                 break;
 323         case LOG_LINE_DELETE_F:
 324                 vtrace("%lu: log_line: delete_f: %lu {%u}\n",
 325                     ep->l_cur, lno, len);
 326                 break;
 327         case LOG_LINE_DELETE_B:
 328                 vtrace("%lu: log_line: delete_b: %lu {%u}\n",
 329                     ep->l_cur, lno, len);
 330                 break;
 331         case LOG_LINE_RESET_F:
 332                 vtrace("%lu: log_line: reset_f: %lu {%u}\n",
 333                     ep->l_cur, lno, len);
 334                 break;
 335         case LOG_LINE_RESET_B:
 336                 vtrace("%lu: log_line: reset_b: %lu {%u}\n",
 337                     ep->l_cur, lno, len);
 338                 break;
 339         }
 340 #endif
 341         /* Reset high water mark. */
 342         ep->l_high = ++ep->l_cur;
 343
 344         return (0);
 345 }
 346
 347 /*
 348  * log_mark --
 349  *      Log a mark position.  For the log to work, we assume that there
 350  *      aren't any operations that just put out a log record -- this
 351  *      would mean that undo operations would only reset marks, and not
 352  *      cause any other change.
 353  *
 354  * PUBLIC: int log_mark __P((SCR *, LMARK *));
 355  */
 356 int
 357 log_mark(SCR *sp, LMARK *lmp)
 358 {
 359         DBT data, key;
 360         EXF *ep;
 361
 362         ep = sp->ep;
 363         if (F_ISSET(ep, F_NOLOG))
 364                 return (0);
 365
 366         /* Put out one initial cursor record per set of changes. */
 367         if (ep->l_cursor.lno != OOBLNO) {
 368                 if (log_cursor1(sp, LOG_CURSOR_INIT))
 369                         return (1);
 370                 ep->l_cursor.lno = OOBLNO;
 371                 ep->l_win = sp->wp;
 372         }
 373
 374         BINC_RETC(sp, sp->wp->l_lp,
 375             sp->wp->l_len, sizeof(u_char) + sizeof(LMARK));
 376         sp->wp->l_lp[0] = LOG_MARK;
 377         memmove(sp->wp->l_lp + sizeof(u_char), lmp, sizeof(LMARK));
 378
 379         memset(&key, 0, sizeof(key));
 380         key.data = &ep->l_cur;
 381         key.size = sizeof(db_recno_t);
 382         memset(&data, 0, sizeof(data));
 383         data.data = sp->wp->l_lp;
 384         data.size = sizeof(u_char) + sizeof(LMARK);
 385         if (ep->log->put(ep->log, &key, &data, 0) == -1)
 386                 LOG_ERR;
 387
 388 #if defined(LOGDEBUG) && defined(TRACE)
 389         vtrace("%lu: mark %c: %lu/%u\n",
 390             ep->l_cur, lmp->name, lmp->lno, lmp->cno);
 391 #endif
 392         /* Reset high water mark. */
 393         ep->l_high = ++ep->l_cur;
 394         return (0);
 395 }
 396
 397 /*
 398  * Log_backward --
 399  *      Roll the log backward one operation.
 400  *
 401  * PUBLIC: int log_backward __P((SCR *, MARK *));
 402  */
 403 int
 404 log_backward(SCR *sp, MARK *rp)
 405 {
 406         DBT key, data;
 407         EXF *ep;
 408         LMARK lm;
 409         MARK m;
 410         db_recno_t lno;
 411         int didop;
 412         u_char *p;
 413
 414         ep = sp->ep;
 415         if (F_ISSET(ep, F_NOLOG)) {
 416                 msgq(sp, M_ERR,
 417                     "010|Logging not being performed, undo not possible");
 418                 return (1);
 419         }
 420
 421         if (ep->l_cur == 1) {
 422                 msgq(sp, M_BERR, "011|No changes to undo");
 423                 return (1);
 424         }
 425
 426         if (ep->l_win && ep->l_win != sp->wp) {
 427                 ex_emsg(sp, NULL, EXM_LOCKED);
 428                 return 1;
 429         }
 430         ep->l_win = sp->wp;
 431
 432
 433         F_SET(ep, F_NOLOG);             /* Turn off logging. */
 434
 435         key.data = &ep->l_cur;          /* Initialize db request. */
 436         key.size = sizeof(recno_t);
 437         for (didop = 0;;) {
 438                 --ep->l_cur;
 439                 if (ep->log->get(ep->log, &key, &data, 0))
 440                         LOG_ERR;
 441 #if defined(LOGDEBUG) && defined(TRACE)
 442                 log_trace(sp, "log_backward", ep->l_cur, data.data);
 443 #endif
 444                 switch (*(p = (u_char *)data.data)) {
 445                 case LOG_CURSOR_INIT:
 446                         if (didop) {
 447                                 memmove(rp, p + sizeof(u_char), sizeof(MARK));
 448                                 F_CLR(ep, F_NOLOG);
 449                                 ep->l_win = NULL;
 450                                 return (0);
 451                         }
 452                         break;
 453                 case LOG_CURSOR_END:
 454                         break;
 455                 case LOG_LINE_APPEND_F:
 456                         didop = 1;
 457                         memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 458                         if (db_delete(sp, lno))
 459                                 goto err;
 460                         ++sp->rptlines[L_DELETED];
 461                         break;
 462                 case LOG_LINE_DELETE_B:
 463                         didop = 1;
 464                         memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 465                         if (db_insert(sp, lno,
 466                             (CHAR_T *)(p + CHAR_T_OFFSET),
 467                             (data.size - CHAR_T_OFFSET) / sizeof(CHAR_T)))
 468                                 goto err;
 469                         ++sp->rptlines[L_ADDED];
 470                         break;
 471                 case LOG_LINE_RESET_F:
 472                         break;
 473                 case LOG_LINE_RESET_B:
 474                         didop = 1;
 475                         memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 476                         if (db_set(sp, lno,
 477                             (CHAR_T *)(p + CHAR_T_OFFSET),
 478                             (data.size - CHAR_T_OFFSET) / sizeof(CHAR_T)))
 479                                 goto err;
 480                         if (sp->rptlchange != lno) {
 481                                 sp->rptlchange = lno;
 482                                 ++sp->rptlines[L_CHANGED];
 483                         }
 484                         break;
 485                 case LOG_MARK:
 486                         didop = 1;
 487                         memmove(&lm, p + sizeof(u_char), sizeof(LMARK));
 488                         m.lno = lm.lno;
 489                         m.cno = lm.cno;
 490                         if (mark_set(sp, lm.name, &m, 0))
 491                                 goto err;
 492                         break;
 493                 default:
 494                         abort();
 495                 }
 496         }
 497
 498 err:    F_CLR(ep, F_NOLOG);
 499         ep->l_win = NULL;
 500         return (1);
 501 }
 502
 503 /*
 504  * Log_setline --
 505  *      Reset the line to its original appearance.
 506  *
 507  * XXX
 508  * There's a bug in this code due to our not logging cursor movements
 509  * unless a change was made.  If you do a change, move off the line,
 510  * then move back on and do a 'U', the line will be restored to the way
 511  * it was before the original change.
 512  *
 513  * PUBLIC: int log_setline __P((SCR *));
 514  */
 515 int
 516 log_setline(SCR *sp)
 517 {
 518         DBT key, data;
 519         EXF *ep;
 520         LMARK lm;
 521         MARK m;
 522         db_recno_t lno;
 523         u_char *p;
 524
 525         ep = sp->ep;
 526         if (F_ISSET(ep, F_NOLOG)) {
 527                 msgq(sp, M_ERR,
 528                     "012|Logging not being performed, undo not possible");
 529                 return (1);
 530         }
 531
 532         if (ep->l_cur == 1)
 533                 return (1);
 534
 535         if (ep->l_win && ep->l_win != sp->wp) {
 536                 ex_emsg(sp, NULL, EXM_LOCKED);
 537                 return 1;
 538         }
 539         ep->l_win = sp->wp;
 540
 541         F_SET(ep, F_NOLOG);             /* Turn off logging. */
 542
 543         key.data = &ep->l_cur;          /* Initialize db request. */
 544         key.size = sizeof(recno_t);
 545
 546         for (;;) {
 547                 --ep->l_cur;
 548                 if (ep->log->get(ep->log, &key, &data, 0))
 549                         LOG_ERR;
 550 #if defined(LOGDEBUG) && defined(TRACE)
 551                 log_trace(sp, "log_setline", ep->l_cur, data.data);
 552 #endif
 553                 switch (*(p = (u_char *)data.data)) {
 554                 case LOG_CURSOR_INIT:
 555                         memmove(&m, p + sizeof(u_char), sizeof(MARK));
 556                         if (m.lno != sp->lno || ep->l_cur == 1) {
 557                                 F_CLR(ep, F_NOLOG);
 558                                 ep->l_win = NULL;
 559                                 return (0);
 560                         }
 561                         break;
 562                 case LOG_CURSOR_END:
 563                         memmove(&m, p + sizeof(u_char), sizeof(MARK));
 564                         if (m.lno != sp->lno) {
 565                                 ++ep->l_cur;
 566                                 F_CLR(ep, F_NOLOG);
 567                                 ep->l_win = NULL;
 568                                 return (0);
 569                         }
 570                         break;
 571                 case LOG_LINE_APPEND_F:
 572                 case LOG_LINE_DELETE_B:
 573                 case LOG_LINE_RESET_F:
 574                         break;
 575                 case LOG_LINE_RESET_B:
 576                         memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 577                         if (lno == sp->lno &&
 578                             db_set(sp, lno, (CHAR_T *)(p + CHAR_T_OFFSET),
 579                                 (data.size - CHAR_T_OFFSET) / sizeof(CHAR_T)))
 580                                 goto err;
 581                         if (sp->rptlchange != lno) {
 582                                 sp->rptlchange = lno;
 583                                 ++sp->rptlines[L_CHANGED];
 584                         }
 585                 case LOG_MARK:
 586                         memmove(&lm, p + sizeof(u_char), sizeof(LMARK));
 587                         m.lno = lm.lno;
 588                         m.cno = lm.cno;
 589                         if (mark_set(sp, lm.name, &m, 0))
 590                                 goto err;
 591                         break;
 592                 default:
 593                         abort();
 594                 }
 595         }
 596
 597 err:    F_CLR(ep, F_NOLOG);
 598         ep->l_win = NULL;
 599         return (1);
 600 }
 601
 602 /*
 603  * Log_forward --
 604  *      Roll the log forward one operation.
 605  *
 606  * PUBLIC: int log_forward __P((SCR *, MARK *));
 607  */
 608 int
 609 log_forward(SCR *sp, MARK *rp)
 610 {
 611         DBT key, data;
 612         EXF *ep;
 613         LMARK lm;
 614         MARK m;
 615         db_recno_t lno;
 616         int didop;
 617         u_char *p;
 618
 619         ep = sp->ep;
 620         if (F_ISSET(ep, F_NOLOG)) {
 621                 msgq(sp, M_ERR,
 622             "013|Logging not being performed, roll-forward not possible");
 623                 return (1);
 624         }
 625
 626         if (ep->l_cur == ep->l_high) {
 627                 msgq(sp, M_BERR, "014|No changes to re-do");
 628                 return (1);
 629         }
 630
 631         if (ep->l_win && ep->l_win != sp->wp) {
 632                 ex_emsg(sp, NULL, EXM_LOCKED);
 633                 return 1;
 634         }
 635         ep->l_win = sp->wp;
 636
 637         F_SET(ep, F_NOLOG);             /* Turn off logging. */
 638
 639         key.data = &ep->l_cur;          /* Initialize db request. */
 640         key.size = sizeof(recno_t);
 641         for (didop = 0;;) {
 642                 ++ep->l_cur;
 643                 if (ep->log->get(ep->log, &key, &data, 0))
 644                         LOG_ERR;
 645 #if defined(LOGDEBUG) && defined(TRACE)
 646                 log_trace(sp, "log_forward", ep->l_cur, data.data);
 647 #endif
 648                 switch (*(p = (u_char *)data.data)) {
 649                 case LOG_CURSOR_END:
 650                         if (didop) {
 651                                 ++ep->l_cur;
 652                                 memmove(rp, p + sizeof(u_char), sizeof(MARK));
 653                                 F_CLR(ep, F_NOLOG);
 654                                 ep->l_win = NULL;
 655                                 return (0);
 656                         }
 657                         break;
 658                 case LOG_CURSOR_INIT:
 659                         break;
 660                 case LOG_LINE_APPEND_F:
 661                         didop = 1;
 662                         memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 663                         if (db_insert(sp, lno,
 664                             (CHAR_T *)(p + CHAR_T_OFFSET),
 665                             (data.size - CHAR_T_OFFSET) / sizeof(CHAR_T)))
 666                                 goto err;
 667                         ++sp->rptlines[L_ADDED];
 668                         break;
 669                 case LOG_LINE_DELETE_B:
 670                         didop = 1;
 671                         memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 672                         if (db_delete(sp, lno))
 673                                 goto err;
 674                         ++sp->rptlines[L_DELETED];
 675                         break;
 676                 case LOG_LINE_RESET_B:
 677                         break;
 678                 case LOG_LINE_RESET_F:
 679                         didop = 1;
 680                         memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 681                         if (db_set(sp, lno,
 682                             (CHAR_T *)(p + CHAR_T_OFFSET),
 683                             (data.size - CHAR_T_OFFSET) / sizeof(CHAR_T)))
 684                                 goto err;
 685                         if (sp->rptlchange != lno) {
 686                                 sp->rptlchange = lno;
 687                                 ++sp->rptlines[L_CHANGED];
 688                         }
 689                         break;
 690                 case LOG_MARK:
 691                         didop = 1;
 692                         memmove(&lm, p + sizeof(u_char), sizeof(LMARK));
 693                         m.lno = lm.lno;
 694                         m.cno = lm.cno;
 695                         if (mark_set(sp, lm.name, &m, 0))
 696                                 goto err;
 697                         break;
 698                 default:
 699                         abort();
 700                 }
 701         }
 702
 703 err:    F_CLR(ep, F_NOLOG);
 704         ep->l_win = NULL;
 705         return (1);
 706 }
 707
 708 /*
 709  * log_err --
 710  *      Try and restart the log on failure, i.e. if we run out of memory.
 711  */
 712 static void
 713 log_err(SCR *sp, const char *file, int line)
 714 {
 715         EXF *ep;
 716
 717         msgq(sp, M_SYSERR, "015|%s/%d: log put error", tail(file), line);
 718         ep = sp->ep;
 719         (void)ep->log->close(ep->log);
 720         if (!log_init(sp, ep))
 721                 msgq(sp, M_ERR, "267|Log restarted");
 722 }
 723
 724 #if defined(LOGDEBUG) && defined(TRACE)
 725 static void
 726 log_trace(sp, msg, rno, p)
 727         SCR *sp;
 728         const char *msg;
 729         db_recno_t rno;
 730         u_char *p;
 731 {
 732         LMARK lm;
 733         MARK m;
 734         db_recno_t lno;
 735
 736         switch (*p) {
 737         case LOG_CURSOR_INIT:
 738                 memmove(&m, p + sizeof(u_char), sizeof(MARK));
 739                 vtrace("%lu: %s:  C_INIT: %u/%u\n", rno, msg, m.lno, m.cno);
 740                 break;
 741         case LOG_CURSOR_END:
 742                 memmove(&m, p + sizeof(u_char), sizeof(MARK));
 743                 vtrace("%lu: %s:   C_END: %u/%u\n", rno, msg, m.lno, m.cno);
 744                 break;
 745         case LOG_LINE_APPEND_F:
 746                 memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 747                 vtrace("%lu: %s:  APPEND_F: %lu\n", rno, msg, lno);
 748                 break;
 749         case LOG_LINE_APPEND_B:
 750                 memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 751                 vtrace("%lu: %s:  APPEND_B: %lu\n", rno, msg, lno);
 752                 break;
 753         case LOG_LINE_DELETE_F:
 754                 memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 755                 vtrace("%lu: %s:  DELETE_F: %lu\n", rno, msg, lno);
 756                 break;
 757         case LOG_LINE_DELETE_B:
 758                 memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 759                 vtrace("%lu: %s:  DELETE_B: %lu\n", rno, msg, lno);
 760                 break;
 761         case LOG_LINE_RESET_F:
 762                 memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 763                 vtrace("%lu: %s: RESET_F: %lu\n", rno, msg, lno);
 764                 break;
 765         case LOG_LINE_RESET_B:
 766                 memmove(&lno, p + sizeof(u_char), sizeof(db_recno_t));
 767                 vtrace("%lu: %s: RESET_B: %lu\n", rno, msg, lno);
 768                 break;
 769         case LOG_MARK:
 770                 memmove(&lm, p + sizeof(u_char), sizeof(LMARK));
 771                 vtrace("%lu: %s:    MARK: %u/%u\n", rno, msg, lm.lno, lm.cno);
 772                 break;
 773         default:
 774                 abort();
 775         }
 776 }
 777 #endif