Brainfuck interpreter in C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define DIM_NASTRO 15

void stampa_nastro(int* nastro, int dim_nastro, int* cur_start, int* cursore){
    int i;
    for(i = 0; i < dim_nastro; i++)
        printf("|%3d", nastro[i]);
    printf("\n");
    int cur_pos = ((int) (cursore - cur_start) )*4;
    for(i = 0; i < cur_pos; i++)
        printf(" ");
    printf("  ^");
    printf("\n");
}


int main()
{
    // adder
    //char codice[] = "++>+++++[->+<]>.";

    // multiplier
    //char codice[] = "+++++[->+++<]>.";

    // hello world
    char codice[] = "++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.";

    // hello world but shorter (doesnt work yet)
    //char codice[] = "--<-<<+[+[<+>--->->->-<<<]>]<<--.<++++++.<<-..<<.<+.>>.>>.<<<.+++.>>.>>-.<<<+.";

    char* istr_ptr = codice;
    int nastro[DIM_NASTRO] = {0};
    int* cursore = nastro;
    //cursore += DIM_NASTRO / 2;

    int par_count;

    while(*istr_ptr){
        //printf("istruzione: %c\n", *istr_ptr);
        switch(*istr_ptr){
            case '+':
                (*cursore)++;
                break;

            case '-':
                (*cursore)--;
                break;

            case '>':
                cursore++;
                break;

            case '<':
                cursore--;
                break;

            case '[':
                par_count = 1;
                if(*cursore == 0){
                    istr_ptr++;
                    while(par_count != 0){
                        if(*istr_ptr == '[') par_count++;
                        if(*istr_ptr == ']') par_count--;
                        if(par_count == 0) break;
                        istr_ptr++;
                    }
                }
                break;
            case ']':
                par_count = 1;
                if(*cursore != 0){
                    istr_ptr--;
                    while(par_count != 0){
                        if(*istr_ptr == '[') par_count--;
                        if(par_count == 0) break;
                        if(*istr_ptr == ']') par_count++;

                        istr_ptr--;
                    }
                }

                break;

            case '.':
                printf("STDOUT: %3d %c\n", *cursore, (char) *cursore);
                break;

            case ',':
                scanf("%d", cursore);
                while(getchar() != '\n');
                break;
        }
        istr_ptr++;
        //stampa_nastro(nastro, DIM_NASTRO, nastro, cursore);
    }

    return 0;
}