pWriter->last = pWriter->last->next;
  }else{
    dataBufferAppend2(&pWriter->last->data, c, n, pTerm, nTerm);
  }
}

/* Free the space used by pWriter, including the linked-list of
** InteriorBlocks.
*/
static int interiorWriterDestroy(InteriorWriter *pWriter){
  InteriorBlock *block = pWriter->first;

  while( block!=NULL ){
    InteriorBlock *b = block;
    block = block->next;
    dataBufferDestroy(&b->term);
    dataBufferDestroy(&b->data);
    free(b);




  }
  SCRAMBLE(pWriter);
  return SQLITE_OK;
}

/* If pWriter can fit entirely in ROOT_MAX, return it as the root info
** directly, leaving *piEndBlockid unchanged.  Otherwise, flush
................................................................................
  if( c!=0 ) return c;
  return nReaderTerm - nTerm;
}

/****************************************************************/
/* LeafWriter is used to collect terms and associated doclist data
** into leaf blocks in %_segments (see top of file for format info).




















*/

/* Put terms with data this big in their own block. */
#define STANDALONE_MIN 1024

/* Keep leaf blocks below this size. */
#define LEAF_MAX 2048
................................................................................
    dlwInit(&dlw, DL_DEFAULT, &dl);
    plwDlwAdd(pData[i].pWriter, &dlw);
    rc = leafWriterStep(v, &writer,
                        pData[i].pTerm, pData[i].nTerm, dl.pData, dl.nData);
    dlwDestroy(&dlw);
    if( rc!=SQLITE_OK ) goto err;
  }

  rc = leafWriterFinalize(v, &writer);

 err:
  free(pData);
  leafWriterDestroy(&writer);
  return rc;
}

    pWriter->last = pWriter->last->next;
  }else{
    dataBufferAppend2(&pWriter->last->data, c, n, pTerm, nTerm);
  }
}

/* Free the space used by pWriter, including the linked-list of
** InteriorBlocks, and parentWriter, if present.
*/
static int interiorWriterDestroy(InteriorWriter *pWriter){
  InteriorBlock *block = pWriter->first;

  while( block!=NULL ){
    InteriorBlock *b = block;
    block = block->next;
    dataBufferDestroy(&b->term);
    dataBufferDestroy(&b->data);
    free(b);
  }
  if( pWriter->parentWriter!=NULL ){
    interiorWriterDestroy(pWriter->parentWriter);
    free(pWriter->parentWriter);
  }
  SCRAMBLE(pWriter);
  return SQLITE_OK;
}

/* If pWriter can fit entirely in ROOT_MAX, return it as the root info
** directly, leaving *piEndBlockid unchanged.  Otherwise, flush
................................................................................
  if( c!=0 ) return c;
  return nReaderTerm - nTerm;
}

/****************************************************************/
/* LeafWriter is used to collect terms and associated doclist data
** into leaf blocks in %_segments (see top of file for format info).
** Expected usage is:
**
** LeafWriter writer;
** leafWriterInit(0, 0, &writer);
** while( sorted_terms_left_to_process ){
**   // data is doclist data for that term.
**   rc = leafWriterStep(v, &writer, pTerm, nTerm, pData, nData);
**   if( rc!=SQLITE_OK ) goto err;
** }
** rc = leafWriterFinalize(v, &writer);
**err:
** leafWriterDestroy(&writer);
** return rc;
**
** leafWriterStep() may write a collected leaf out to %_segments.
** leafWriterFinalize() finishes writing any buffered data and stores
** a root node in %_segdir.  leafWriterDestroy() frees all buffers and
** InteriorWriters allocated as part of writing this segment.
**
** TODO(shess) Document leafWriterStepMerge().
*/

/* Put terms with data this big in their own block. */
#define STANDALONE_MIN 1024

/* Keep leaf blocks below this size. */
#define LEAF_MAX 2048
................................................................................
    dlwInit(&dlw, DL_DEFAULT, &dl);
    plwDlwAdd(pData[i].pWriter, &dlw);
    rc = leafWriterStep(v, &writer,
                        pData[i].pTerm, pData[i].nTerm, dl.pData, dl.nData);
    dlwDestroy(&dlw);
    if( rc!=SQLITE_OK ) goto err;
  }
  dataBufferDestroy(&dl);
  rc = leafWriterFinalize(v, &writer);

 err:
  free(pData);
  leafWriterDestroy(&writer);
  return rc;
}