How can I read a CSV file with different line types?

Question

I am trying to read a CSV file that has different lines. I am using fgets and Strtok to store in a list. the problem is that being different lines do not know how to stop and move to the next.

typedef struct{
int id_viagem;
int duracao;
int mes_init;
int dia_init;
int ano_init;
int hora_init;
int min_init;
int id_estacao_init;
int mes_final;
int dia_final;
int ano_final;
int min_final;
int id_estacao_final;
char *bicicleta;
int tipo; 
int nascimento;
char *genero;
}INFO_VIAGEM;

This is the structure that gives rise to the list, and these are the different line types:

41,460,7/28/2011 12:10:00,22,7/28/2011 12:18:00,49,B00353,Registered,1972,Male

61,1315,7/28/2011 12:33:00,36,7/28/2011 12:55:00,38,B00228,Casual,,

auxx=strtok(NULL, str_div);
    tipo=auxx;
    if(strcmp(tipo, "Casual") == 0){
        z.tipo=0;

    }
    else{
        z.tipo=1;
        auxx=strtok(NULL, str_div);
        z.nascimento=atoi(auxx);

        auxx=strtok(NULL, str_div3);
        z.genero=auxx;
    }

Just like the first line and always Registered it always reads even what there is. How can I do?