// ./stdin < 22.bin o cat 22.bin | ./stdin

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

// gets() is dangerous, it doesn't check the size of the buffer
char *gets(char *s)
{
    int c = '\0';
    char *dest = s;
    while ((c = getchar()) != EOF && c != '\n')
        *dest++ = c;
    *dest = '\0';
    return s;
}

int main()
{
    char shellcode[64];
    gets(shellcode);
    printf("shellcode[%zu] = %s\n", strlen(shellcode), shellcode);
    ((void (*)())shellcode)();
}