#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <stdio.h>

#define BLOCK_SIZE 1


int main(int argc, char *argv[])
{
    FILE* fin,
        * fout;
    char buf[BLOCK_SIZE];

    assert( argc == 3 );

    fin = fopen(argv[1], "r");
    assert( fin != NULL );

    fout = fopen(argv[2],"w");
    assert( fout != NULL );

    while(1){
        ssize_t nb_read; 
        nb_read = fread(buf,BLOCK_SIZE,1,fin);
        if (nb_read <= 0)
            break;
        fwrite(buf,BLOCK_SIZE,nb_read,fout);
    }

    fclose(fin);
    fclose(fout);

    return 0;
}