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.

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().

{
   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);
}