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.

{
    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);
}

References __rec_ret(), __rec_search(), B_DB_LOCK, _btree::bt_cursor, _btree::bt_mp, _btree::bt_nrecs, _btree::bt_pinned, CURS_INIT, DBT::data, dbp, 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().