Fil fail

fail.c

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

/* if you compile this source to ./a.out,
 * what is the result of "echo filfail | ./a.out" ? */

struct {
        char name[7];
        bool is_restricted;
} user;

int main(void) {
        user.is_restricted = true;

        printf("Name: ");
        fflush(stdout);
        gets(user.name);

        if(strcmp(user.name, "admin") == 0) {
                user.is_restricted = false;
        }

        if(user.is_restricted) {
                puts("access is denied");
                return 1;
        } else {
                puts("welcome administrator");
                return 0;
        }
}

result

$ echo FILFAIL | ./a.out
welcome administrator