rec_seq.c File Reference

#include <sys/types.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "../include/db.h"
#include "recno.h"

Include dependency graph for rec_seq.c:

Go to the source code of this file.

Functions
int	__rec_seq (DB *dbp, DBT *key, DBT *data, u_int flags) const

Function Documentation

__rec_seq()

int __rec_seq	(	DB *	dbp,
		DBT *	key,
		DBT *	data,
		u_int	flags
	)		const

Definition at line 61 of file rec_seq.c.

References __rec_ret(), __rec_search(), B_DB_LOCK, _btree::bt_cursor, _btree::bt_mp, _btree::bt_nrecs, _btree::bt_pinned, CURS_INIT, DBT::data, errno, F_ISSET, F_SET, __db::internal, MAX_REC_NUMBER, mpool_put(), NULL, _epg::page, R_CURSOR, R_EOF, R_FIRST, R_INMEM, R_LAST, R_NEXT, R_PREV, _cursor::rcursor, RET_ERROR, RET_SPECIAL, RET_SUCCESS, SEARCH, and status.

Referenced by __rec_open().

{
   BTREE *t;
   EPG *e;
   recno_t nrec;
   int status;

   t = dbp->internal;

   /* Toss any page pinned across calls. */
   if (t->bt_pinned != NULL) {
      mpool_put(t->bt_mp, t->bt_pinned, 0);
      t->bt_pinned = NULL;
   }

   switch(flags) {
   case R_CURSOR:
      if ((nrec = *(recno_t *)key->data) == 0)
         goto einval;
      break;
   case R_NEXT:
      if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
         nrec = t->bt_cursor.rcursor + 1;
         break;
      }
      /* FALLTHROUGH */
   case R_FIRST:
      nrec = 1;
      break;
   case R_PREV:
      if (F_ISSET(&t->bt_cursor, CURS_INIT)) {
         if ((nrec = t->bt_cursor.rcursor - 1) == 0)
            return (RET_SPECIAL);
         break;
      }
      /* FALLTHROUGH */
   case R_LAST:
      if (!F_ISSET(t, R_EOF | R_INMEM) &&
          t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
         return (RET_ERROR);
      nrec = t->bt_nrecs;
      break;
   default:
einval:     errno = EINVAL;
      return (RET_ERROR);
   }

   if (t->bt_nrecs == 0 || nrec > t->bt_nrecs) {
      if (!F_ISSET(t, R_EOF | R_INMEM) &&
          (status = t->bt_irec(t, nrec)) != RET_SUCCESS)
         return (status);
      if (t->bt_nrecs == 0 || nrec > t->bt_nrecs)
         return (RET_SPECIAL);
   }

   if ((e = __rec_search(t, nrec - 1, SEARCH)) == NULL)
      return (RET_ERROR);

   F_SET(&t->bt_cursor, CURS_INIT);
   t->bt_cursor.rcursor = nrec;

   status = __rec_ret(t, e, nrec, key, data);
   if (F_ISSET(t, B_DB_LOCK))
      mpool_put(t->bt_mp, e->page, 0);
   else
      t->bt_pinned = e->page;
   return (status);
}