common/db.c

   1 /*-
   2  * Copyright (c) 1992, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * %sccs.include.redist.c%
   6  */
   7
   8 #ifndef lint
   9 static char sccsid[] = "$Id: db.c,v 8.17 1993/11/19 10:54:36 bostic Exp $ (Berkeley) $Date: 1993/11/19 10:54:36 $";
  10 #endif /* not lint */
  11
  12 #include <sys/types.h>
  13
  14 #include <errno.h>
  15 #include <string.h>
  16
  17 #include "vi.h"
  18
  19 static inline int scr_update __P((SCR *, EXF *, recno_t, enum operation, int));
  20
  21 /*
  22  * file_gline --
  23  *      Look in the text buffers for a line; if it's not there
  24  *      call file_rline to retrieve it from the database.
  25  */
  26 char *
  27 file_gline(sp, ep, lno, lenp)
  28         SCR *sp;
  29         EXF *ep;
  30         recno_t lno;                            /* Line number. */
  31         size_t *lenp;                           /* Length store. */
  32 {
  33         TEXT *tp;
  34
  35         /*
  36          * The underlying recno stuff handles zero by returning NULL, but
  37          * have to have an oob condition for the look-aside into the input
  38          * buffer anyway.
  39          */
  40         if (lno == 0)
  41                 return (NULL);
  42
  43         /*
  44          * Look-aside into the TEXT buffers and see if the line we want
  45          * is there.
  46          */
  47         if (F_ISSET(sp, S_INPUT) &&
  48             ((TEXT *)sp->tiq.cqh_first)->lno <= lno &&
  49             ((TEXT *)sp->tiq.cqh_last)->lno >= lno) {
  50                 for (tp = sp->tiq.cqh_first;
  51                     tp->lno != lno; tp = tp->q.cqe_next);
  52                 if (lenp)
  53                         *lenp = tp->len;
  54                 return (tp->lb);
  55         }
  56         return (file_rline(sp, ep, lno, lenp));
  57 }
  58
  59 /*
  60  * file_rline --
  61  *      Look in the cache for a line; if it's not there retrieve
  62  *      it from the file.
  63  */
  64 char *
  65 file_rline(sp, ep, lno, lenp)
  66         SCR *sp;
  67         EXF *ep;
  68         recno_t lno;                            /* Line number. */
  69         size_t *lenp;                           /* Length store. */
  70 {
  71         DBT data, key;
  72
  73         /* Check the cache. */
  74         if (lno == ep->c_lno) {
  75                 if (lenp)
  76                         *lenp = ep->c_len;
  77                 return (ep->c_lp);
  78         }
  79         ep->c_lno = OOBLNO;
  80
  81         /* Get the line from the underlying database. */
  82         key.data = &lno;
  83         key.size = sizeof(lno);
  84         switch (ep->db->get(ep->db, &key, &data, 0)) {
  85         case -1:
  86                 msgq(sp, M_ERR,
  87                     "Error: %s/%d: unable to get line %u: %s.",
  88                     tail(__FILE__), __LINE__, lno, strerror(errno));
  89                 /* FALLTHROUGH */
  90         case 1:
  91                 return (NULL);
  92                 /* NOTREACHED */
  93         }
  94         if (lenp)
  95                 *lenp = data.size;
  96
  97         /* Fill the cache. */
  98         ep->c_lno = lno;
  99         ep->c_len = data.size;
 100         ep->c_lp = data.data;
 101
 102         return (data.data);
 103 }
 104
 105 /*
 106  * file_dline --
 107  *      Delete a line from the file.
 108  */
 109 int
 110 file_dline(sp, ep, lno)
 111         SCR *sp;
 112         EXF *ep;
 113         recno_t lno;
 114 {
 115         DBT key;
 116
 117 #if defined(DEBUG) && 0
 118         TRACE(sp, "delete line %lu\n", lno);
 119 #endif
 120         /* Delete any marks in the line. */
 121         mark_delete(sp, ep, lno);
 122
 123         /* Log change. */
 124         log_line(sp, ep, lno, LOG_LINE_DELETE);
 125
 126         /* Update file. */
 127         key.data = &lno;
 128         key.size = sizeof(lno);
 129         if (ep->db->del(ep->db, &key, 0) == 1) {
 130                 msgq(sp, M_ERR,
 131                     "Error: %s/%d: unable to delete line %u: %s.",
 132                     tail(__FILE__), __LINE__, lno, strerror(errno));
 133                 return (1);
 134         }
 135
 136         /* Flush the cache, update line count, before screen update. */
 137         if (lno <= ep->c_lno)
 138                 ep->c_lno = OOBLNO;
 139         if (ep->c_nlines != OOBLNO)
 140                 --ep->c_nlines;
 141
 142         /* File now dirty. */
 143         if (F_ISSET(ep, F_FIRSTMODIFY))
 144                 (void)rcv_init(sp, ep);
 145         F_SET(ep, F_MODIFIED);
 146
 147         /* Update screen. */
 148         return (scr_update(sp, ep, lno, LINE_DELETE, 1));
 149 }
 150
 151 /*
 152  * file_aline --
 153  *      Append a line into the file.
 154  */
 155 int
 156 file_aline(sp, ep, update, lno, p, len)
 157         SCR *sp;
 158         EXF *ep;
 159         int update;
 160         recno_t lno;
 161         char *p;
 162         size_t len;
 163 {
 164         DBT data, key;
 165         recno_t lline;
 166
 167 #if defined(DEBUG) && 0
 168         TRACE(sp, "append to %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
 169 #endif
 170         /*
 171          * Very nasty special case.  The historic vi code displays a single
 172          * space (or a '$' if the list option is set) for the first line in
 173          * an "empty" file.  If we "insert" a line, that line gets scrolled
 174          * down, not repainted, so it's incorrect when we refresh the the
 175          * screen.  This is really hard to find and fix in the vi code -- the
 176          * text input functions detect it explicitly and don't insert a new
 177          * line.  The hack here is to repaint the screen if we're appending
 178          * to an empty file.
 179          */
 180         if (lno == 0) {
 181                 if (file_lline(sp, ep, &lline))
 182                         return (1);
 183                 if (lline == 0)
 184                         F_SET(sp, S_REDRAW);
 185         }
 186
 187         /* Update file. */
 188         key.data = &lno;
 189         key.size = sizeof(lno);
 190         data.data = p;
 191         data.size = len;
 192         if (ep->db->put(ep->db, &key, &data, R_IAFTER) == -1) {
 193                 msgq(sp, M_ERR,
 194                     "Error: %s/%d: unable to append to line %u: %s.",
 195                     tail(__FILE__), __LINE__, lno, strerror(errno));
 196                 return (1);
 197         }
 198
 199         /* Flush the cache, update line count, before screen update. */
 200         if (lno < ep->c_lno)
 201                 ep->c_lno = OOBLNO;
 202         if (ep->c_nlines != OOBLNO)
 203                 ++ep->c_nlines;
 204
 205         /* File now dirty. */
 206         if (F_ISSET(ep, F_FIRSTMODIFY))
 207                 (void)rcv_init(sp, ep);
 208         F_SET(ep, F_MODIFIED);
 209
 210         /* Log change. */
 211         log_line(sp, ep, lno + 1, LOG_LINE_APPEND);
 212
 213         /* Push any marks above the line. */
 214         mark_insert(sp, ep, lno + 1);
 215
 216         /*
 217          * Update screen.
 218          *
 219          * XXX
 220          * Nasty hack.  If multiple lines are input by the user, they aren't
 221          * committed until an <ESC> is entered.  The problem is the screen was
 222          * updated/scrolled as each line was entered.  So, when this routine
 223          * is called to copy the new lines from the cut buffer into the file,
 224          * it has to know not to update the screen again.
 225          */
 226         return (scr_update(sp, ep, lno, LINE_APPEND, update));
 227 }
 228
 229 /*
 230  * file_iline --
 231  *      Insert a line into the file.
 232  */
 233 int
 234 file_iline(sp, ep, lno, p, len)
 235         SCR *sp;
 236         EXF *ep;
 237         recno_t lno;
 238         char *p;
 239         size_t len;
 240 {
 241         DBT data, key;
 242         recno_t lline;
 243
 244 #if defined(DEBUG) && 0
 245         TRACE(sp,
 246             "insert before %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
 247 #endif
 248
 249         /* Very nasty special case.  See comment in file_aline(). */
 250         if (lno == 1) {
 251                 if (file_lline(sp, ep, &lline))
 252                         return (1);
 253                 if (lline == 0)
 254                         F_SET(sp, S_REDRAW);
 255         }
 256
 257         /* Update file. */
 258         key.data = &lno;
 259         key.size = sizeof(lno);
 260         data.data = p;
 261         data.size = len;
 262         if (ep->db->put(ep->db, &key, &data, R_IBEFORE) == -1) {
 263                 msgq(sp, M_ERR,
 264                     "Error: %s/%d: unable to insert at line %u: %s.",
 265                     tail(__FILE__), __LINE__, lno, strerror(errno));
 266                 return (1);
 267         }
 268
 269         /* Flush the cache, update line count, before screen update. */
 270         if (lno >= ep->c_lno)
 271                 ep->c_lno = OOBLNO;
 272         if (ep->c_nlines != OOBLNO)
 273                 ++ep->c_nlines;
 274
 275         /* File now dirty. */
 276         if (F_ISSET(ep, F_FIRSTMODIFY))
 277                 (void)rcv_init(sp, ep);
 278         F_SET(ep, F_MODIFIED);
 279
 280         /* Log change. */
 281         log_line(sp, ep, lno, LOG_LINE_INSERT);
 282
 283         /* Push any marks above the line. */
 284         mark_insert(sp, ep, lno);
 285
 286         /* Update screen. */
 287         return (scr_update(sp, ep, lno, LINE_INSERT, 1));
 288 }
 289
 290 /*
 291  * file_sline --
 292  *      Store a line in the file.
 293  */
 294 int
 295 file_sline(sp, ep, lno, p, len)
 296         SCR *sp;
 297         EXF *ep;
 298         recno_t lno;
 299         char *p;
 300         size_t len;
 301 {
 302         DBT data, key;
 303
 304 #if defined(DEBUG) && 0
 305         TRACE(sp,
 306             "replace line %lu: len %u {%.*s}\n", lno, len, MIN(len, 20), p);
 307 #endif
 308         /* Log before change. */
 309         log_line(sp, ep, lno, LOG_LINE_RESET_B);
 310
 311         /* Update file. */
 312         key.data = &lno;
 313         key.size = sizeof(lno);
 314         data.data = p;
 315         data.size = len;
 316         if (ep->db->put(ep->db, &key, &data, 0) == -1) {
 317                 msgq(sp, M_ERR,
 318                     "Error: %s/%d: unable to store line %u: %s.",
 319                     tail(__FILE__), __LINE__, lno, strerror(errno));
 320                 return (1);
 321         }
 322
 323         /* Flush the cache, before logging or screen update. */
 324         if (lno == ep->c_lno)
 325                 ep->c_lno = OOBLNO;
 326
 327         /* File now dirty. */
 328         if (F_ISSET(ep, F_FIRSTMODIFY))
 329                 (void)rcv_init(sp, ep);
 330         F_SET(ep, F_MODIFIED);
 331
 332         /* Log after change. */
 333         log_line(sp, ep, lno, LOG_LINE_RESET_F);
 334
 335         /* Update screen. */
 336         return (scr_update(sp, ep, lno, LINE_RESET, 1));
 337 }
 338
 339 /*
 340  * file_lline --
 341  *      Return the number of lines in the file.
 342  */
 343 int
 344 file_lline(sp, ep, lnop)
 345         SCR *sp;
 346         EXF *ep;
 347         recno_t *lnop;
 348 {
 349         DBT data, key;
 350         recno_t lno;
 351
 352         /* Check the cache. */
 353         if (ep->c_nlines != OOBLNO) {
 354                 *lnop = (F_ISSET(sp, S_INPUT) &&
 355                     ((TEXT *)sp->tiq.cqh_last)->lno > ep->c_nlines ?
 356                     ((TEXT *)sp->tiq.cqh_last)->lno : ep->c_nlines);
 357                 return (0);
 358         }
 359
 360         key.data = &lno;
 361         key.size = sizeof(lno);
 362
 363         switch (ep->db->seq(ep->db, &key, &data, R_LAST)) {
 364         case -1:
 365                 msgq(sp, M_ERR,
 366                     "Error: %s/%d: unable to get last line: %s.",
 367                     tail(__FILE__), __LINE__, strerror(errno));
 368                 *lnop = 0;
 369                 return (1);
 370         case 1:
 371                 lno = 0;
 372                 break;
 373         default:
 374                 memmove(&lno, key.data, sizeof(lno));
 375                 break;
 376         }
 377
 378         /* Fill the cache. */
 379         ep->c_nlines = ep->c_lno = lno;
 380         ep->c_len = data.size;
 381         ep->c_lp = data.data;
 382
 383         *lnop = (F_ISSET(sp, S_INPUT) &&
 384             ((TEXT *)sp->tiq.cqh_last)->lno > lno ?
 385             ((TEXT *)sp->tiq.cqh_last)->lno : lno);
 386         return (0);
 387 }
 388
 389 /*
 390  * scr_update --
 391  *      Update all of the screens that are backed by the file that
 392  *      just changed.
 393  */
 394 static inline int
 395 scr_update(sp, ep, lno, op, current)
 396         SCR *sp;
 397         EXF *ep;
 398         recno_t lno;
 399         enum operation op;
 400         int current;
 401 {
 402         SCR *tsp;
 403
 404         if (ep->refcnt != 1)
 405                 for (tsp = sp->gp->dq.cqh_first;
 406                     tsp != (void *)&sp->gp->dq; tsp = tsp->q.cqe_next)
 407                         if (sp != tsp && tsp->ep == ep)
 408                                 (void)sp->s_change(tsp, ep, lno, op);
 409         return (current && sp->s_change(sp, ep, lno, op));
 410 }