memory usage

vector<OBMol> molecules;
OBMol mol;
while (!feof(f)) {
        fscanf(f, "%c %c", &type, &comment);
        if (type == comment)
            continue;

        //molecule title and its frequency
        if (type == 't') {
            fscanf(f, "%256s %d\n", buffer, &frequency );
            m.SetTitle(buffer);
        }

        //molecule nodes and edges
        while (!feof(f)) {
            fscanf(f, "%c", &type);
            if (type == 'v' || type == 'V') {
                fscanf(f, "%d %256s\n", &v1, buffer);
                m.NewAtom(v1);

                //set atom type
                m.GetAtomById(v1)->SetType(buffer);
            }
            else if (type == 'u' || type == 'U' ){
                fscanf(f, "%d %d %d\n", &v1, &v2, &order);
                m.AddBond(v1+1, v2+1, order);
                POS = ftell(f);
            }
            else if(type == 't') {
                //go back one line to get new molecule header
                fseek(f, POS, SEEK_SET);
                molecules.push_back(m);
                break;
            }
        }
        m.Clear();
    }
}