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);
}