use warnings;
use strict;
use feature 'say';

use Inline 'C';

my @b = (1..3, 253..255);
my $x = pack "V0C*", @b;

check($x, length($x));

__END__
__C__

#include <stdio.h>
#include <stdint.h>

void check(unsigned char* n, int len){

    int i;
    
    for(i=0; i<len; i++){
       printf("%d\n", n[i]);
    }
}