SQLite

** The pointer returned points to memory obtained from sqlite3_malloc(). It
** is the callers responsibility to call sqlite3_free() to release this
** memory.
*/
static char *fts3QuoteId(char const *zInput){
  int nRet;
  char *zRet;
  nRet = 2 + (int)strlen(zInput)*2 + 1;
  zRet = sqlite3_malloc(nRet);
  if( zRet ){
    int i;
    char *z = zRet;
    *(z++) = '"';
    for(i=0; zInput[i]; i++){
      if( zInput[i]=='"' ) *(z++) = '"';

    /* Loop through the returned columns. Set nStr to the number of bytes of
    ** space required to store a copy of each column name, including the
    ** nul-terminator byte.  */
    nCol = sqlite3_column_count(pStmt);
    for(i=0; i<nCol; i++){
      const char *zCol = sqlite3_column_name(pStmt, i);
      nStr += (int)strlen(zCol) + 1;
    }

    /* Allocate and populate the array to return. */
    azCol = (const char **)sqlite3_malloc(sizeof(char *) * nCol + nStr);
    if( azCol==0 ){
      rc = SQLITE_NOMEM;
    }else{
      char *p = (char *)&azCol[nCol];
      for(i=0; i<nCol; i++){
        const char *zCol = sqlite3_column_name(pStmt, i);
        int n = (int)strlen(zCol)+1;
        memcpy(p, zCol, n);
        azCol[i] = p;
        p += n;
      }
    }
    sqlite3_finalize(pStmt);

      fts3PutDeltaVarint3(&p, bDescDoclist, &iPrev, &bFirstOut, i2);
      fts3PoslistCopy(&p, &p2);
      fts3GetDeltaVarint3(&p2, pEnd2, bDescDoclist, &i2);
    }
  }

  *paOut = aOut;
  *pnOut = (int)(p-aOut);
  assert( *pnOut<=n1+n2+FTS3_VARINT_MAX-1 );
  return SQLITE_OK;
}

/*
** This function does a "phrase" merge of two doclists. In a phrase merge,
** the output contains a copy of each position from the right-hand input

      fts3GetDeltaVarint3(&p1, pEnd1, bDescDoclist, &i1);
    }else{
      fts3PoslistCopy(0, &p2);
      fts3GetDeltaVarint3(&p2, pEnd2, bDescDoclist, &i2);
    }
  }

  *pnRight = (int)(p - aOut);
}

/*
** Argument pList points to a position list nList bytes in size. This
** function checks to see if the position list contains any entries for
** a token in position 0 (of any column). If so, it writes argument iDelta
** to the output buffer pOut, followed by a position list consisting only

        char *p1 = aPoslist;
        char *p2 = aOut;

        assert( iPrev>=0 );
        fts3PoslistPhraseMerge(&aOut, iToken-iPrev, 0, 1, &p1, &p2);
        sqlite3_free(aPoslist);
        aPoslist = pList;
        nPoslist = (int)(aOut - aPoslist);
        if( nPoslist==0 ){
          sqlite3_free(aPoslist);
          pPhrase->doclist.pList = 0;
          pPhrase->doclist.nList = 0;
          return SQLITE_OK;
        }
      }

        sqlite3_free(aPoslist);
        return SQLITE_NOMEM;
      }
      
      pPhrase->doclist.pList = aOut;
      if( fts3PoslistPhraseMerge(&aOut, nDistance, 0, 1, &p1, &p2) ){
        pPhrase->doclist.bFreeList = 1;
        pPhrase->doclist.nList = (int)(aOut - pPhrase->doclist.pList);
      }else{
        sqlite3_free(aOut);
        pPhrase->doclist.pList = 0;
        pPhrase->doclist.nList = 0;
      }
      sqlite3_free(aPoslist);
    }

      iDocid += (iMul * iDelta);
      pNext = pDocid;
      fts3PoslistCopy(0, &pDocid);
      while( pDocid<pEnd && *pDocid==0 ) pDocid++;
      iMul = (bDescIdx ? -1 : 1);
    }

    *pnList = (int)(pEnd - pNext);
    *ppIter = pNext;
    *piDocid = iDocid;
  }else{
    int iMul = (bDescIdx ? -1 : 1);
    sqlite3_int64 iDelta;
    fts3GetReverseVarint(&p, aDoclist, &iDelta);
    *piDocid -= (iMul * iDelta);

    if( p==aDoclist ){
      *pbEof = 1;
    }else{
      char *pSave = p;
      fts3ReversePoslist(aDoclist, &p);
      *pnList = (int)(pSave - p);
    }
    *ppIter = p;
  }
}

/*
** Attempt to move the phrase iterator to point to the next matching docid. 

      rc = SQLITE_NOMEM;
    }else{
      int ii;
      Fts3TokenAndCost *pTC = aTC;
      Fts3Expr **ppOr = apOr;

      fts3EvalTokenCosts(pCsr, 0, pCsr->pExpr, &pTC, &ppOr, &rc);
      nToken = (int)(pTC-aTC);
      nOr = (int)(ppOr-apOr);

      if( rc==SQLITE_OK ){
        rc = fts3EvalSelectDeferred(pCsr, 0, aTC, nToken);
        for(ii=0; rc==SQLITE_OK && ii<nOr; ii++){
          rc = fts3EvalSelectDeferred(pCsr, apOr[ii], aTC, nToken);
        }
      }

  assert( pPhrase->doclist.pList );

  p2 = pOut = pPhrase->doclist.pList;
  res = fts3PoslistNearMerge(
    &pOut, aTmp, nParam1, nParam2, paPoslist, &p2
  );
  if( res ){
    nNew = (int)(pOut - pPhrase->doclist.pList) - 1;
    assert( pPhrase->doclist.pList[nNew]=='\0' );
    assert( nNew<=pPhrase->doclist.nList && nNew>0 );
    memset(&pPhrase->doclist.pList[nNew], 0, pPhrase->doclist.nList - nNew);
    pPhrase->doclist.nList = nNew;
    *paPoslist = pPhrase->doclist.pList;
    *pnToken = pPhrase->nToken;
  }

    *pzErr = sqlite3_mprintf(
        "wrong number of arguments to fts4aux constructor"
    );
    return SQLITE_ERROR;
  }

  zDb = argv[1]; 
  nDb = (int)strlen(zDb);
  zFts3 = argv[3];
  nFts3 = (int)strlen(zFts3);

  rc = sqlite3_declare_vtab(db, FTS3_TERMS_SCHEMA);
  if( rc!=SQLITE_OK ) return rc;

  nByte = sizeof(Fts3auxTable) + sizeof(Fts3Table) + nDb + nFts3 + 2;
  p = (Fts3auxTable *)sqlite3_malloc(nByte);
  if( !p ) return SQLITE_NOMEM;

    *pzErr = sqlite3_mprintf("%s", aErrMsg[iErr]);
    return SQLITE_ERROR;
  }

  sqlite3_vtab_config(db, SQLITE_VTAB_CONSTRAINT_SUPPORT, 1);

  /* Allocate the sqlite3_vtab structure */
  nDb = (int)strlen(argv[1]);
  nName = (int)strlen(argv[2]);
  pRtree = (Rtree *)sqlite3_malloc(sizeof(Rtree)+nDb+nName+2);
  if( !pRtree ){
    return SQLITE_NOMEM;
  }
  memset(pRtree, 0, sizeof(Rtree)+nDb+nName+2);
  pRtree->nBusy = 1;
  pRtree->base.pModule = &rtreeModule;

    char zCell[512];
    int nCell = 0;
    RtreeCell cell;
    int jj;

    nodeGetCell(&tree, &node, ii, &cell);
    sqlite3_snprintf(512-nCell,&zCell[nCell],"%lld", cell.iRowid);
    nCell = (int)strlen(zCell);
    for(jj=0; jj<tree.nDim*2; jj++){
      sqlite3_snprintf(512-nCell,&zCell[nCell]," %f",(double)cell.aCoord[jj].f);
      nCell = (int)strlen(zCell);
    }

    if( zText ){
      char *zTextNew = sqlite3_mprintf("%s {%s}", zText, zCell);
      sqlite3_free(zText);
      zText = zTextNew;
    }else{