rec_utils.c File Reference

#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../include/db.h"
#include "recno.h"

Include dependency graph for rec_utils.c:

Go to the source code of this file.

Functions
int	__rec_ret (BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data)

Function Documentation

__rec_ret()

int __rec_ret	(	BTREE *	t,
		EPG *	e,
		recno_t	nrec,
		DBT *	key,
		DBT *	data
	)

Definition at line 62 of file rec_utils.c.

{
    RLEAF *rl;
    void *p;
 
    if (key == NULL)
        goto dataonly;
 
    /* We have to copy the key, it's not on the page. */
    if (sizeof(recno_t) > t->bt_rkey.size) {
        p = (void *)(t->bt_rkey.data == NULL ?
            malloc(sizeof(recno_t)) :
            realloc(t->bt_rkey.data, sizeof(recno_t)));
        if (p == NULL)
            return (RET_ERROR);
        t->bt_rkey.data = p;
        t->bt_rkey.size = sizeof(recno_t);
    }
    memmove(t->bt_rkey.data, &nrec, sizeof(recno_t));
    key->size = sizeof(recno_t);
    key->data = t->bt_rkey.data;
 
dataonly:
    if (data == NULL)
        return (RET_SUCCESS);
 
    /*
     * We must copy big keys/data to make them contiguous.  Otherwise,
     * leave the page pinned and don't copy unless the user specified
     * concurrent access.
     */
    rl = GETRLEAF(e->page, e->index);
    if (rl->flags & P_BIGDATA) {
        if (__ovfl_get(t, rl->bytes,
            &data->size, &t->bt_rdata.data, &t->bt_rdata.size))
            return (RET_ERROR);
        data->data = t->bt_rdata.data;
    } else if (F_ISSET(t, B_DB_LOCK)) {
        /* Use +1 in case the first record retrieved is 0 length. */
        if (rl->dsize + 1 > t->bt_rdata.size) {
            p = (void *)(t->bt_rdata.data == NULL ?
                malloc(rl->dsize + 1) :
                realloc(t->bt_rdata.data, rl->dsize + 1));
            if (p == NULL)
                return (RET_ERROR);
            t->bt_rdata.data = p;
            t->bt_rdata.size = rl->dsize + 1;
        }
        memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
        data->size = rl->dsize;
        data->data = t->bt_rdata.data;
    } else {
        data->size = rl->dsize;
        data->data = rl->bytes;
    }
    return (RET_SUCCESS);
}

References __ovfl_get(), B_DB_LOCK, _btree::bt_rdata, _btree::bt_rkey, _rleaf::bytes, DBT::data, _rleaf::dsize, F_ISSET, _rleaf::flags, GETRLEAF, _epg::index, malloc(), NULL, P_BIGDATA, _epg::page, realloc, RET_ERROR, RET_SUCCESS, and DBT::size.

Referenced by __rec_get(), __rec_put(), and __rec_seq().