#include <stdio.h>

#ifdef __unix__
    #define OS "UNIX"
    #include <unistd.h>
    #include <stdlib.h>
    #define limparTela() system("clear");
#elif defined(_WIN32) || defined(WIN32)
    #define OS "WIN"
    #include <windows.h>
    #define limparTela() system("cls");
#endif

#define STR_MAX_LENGTH 10
#define _STR(X) #X

void criptografar(char (*)[]);
void descriptografar();

int main(void)
{
    char msg[STR_MAX_LENGTH];
    int op, confirmarSaida;
    while(1)
    {
        printf("-------------------------------------------\n");
        printf("|\t\tRSA\t\t\t  |\n");
        printf("|\t<1>Criptografar mensagem\t  |\n");
        printf("|\t<2>Descriptografar mensagem\t  |\n");
        printf("|\t<0>Sair\t\t\t\t  |\n");
        printf("-------------------------------------------\n");

        printf("\n> ");
        scanf("%d", &op);
        switch(op)
        {
            case 1:
                limparTela();
                criptografar(&msg);
                break;
            case 2:
                limparTela();
                descriptografar();
                break;
            case 0:
                printf("Deseja realmente SAIR? (1 = SIM, 0 = NAO)\n");
                scanf("%d", &confirmarSaida);
                if (confirmarSaida == 1)
                    return 0;
                limparTela();
                break;
            default:
                limparTela();
                printf("\nOpcao invalida!\n");
                break;
        }
    }
    return 0;
}

void criptografar(char (*msg)[STR_MAX_LENGTH])
{
    int SCANF_MAX_LENGTH = STR_MAX_LENGTH - 1;
    scanf("%" _STR(SCANF_MAX_LENGTH) "[^\n]", msg);
}

void descriptografar()
{
    printf("\nImplementacao da funcao de descriptografar\n");
}