FILE global_files[8];

void CopyFiles(void)
{
    FILE local_files[8];

    for (int i = 0; i < 8; i++)
   {
        copy (global_files[i],  local_files[i]);  //??? copy (char*, char*) - аргументы массивы
   }
}

copy ((char)*global_files[i], (char)* local_files[i]);

struct posix_header
{                               /* byte offset */
...
  char chksum[8];               /* 148 */
...
};

FILE global_files[8];

STATUS TFTP_ProcessFiles(char *arc_name, char *file_name)
{
    int loc_fd, glob_fd;
    char buf[TFTP_BUFF_SIZE];
    
    tarExtract(arc_name,0, FALSE);
    
    for (int i = 0; i < TFTP_FILES_COUNT; i++)
    {
        strcat(file_name, (char *)48+i);
        loc_fd = open(file_name, O_RDONLY, 0644);
        glob_fd = open ????
        
        read(loc_fd, buf, TFTP_BUFF_SIZE);
        
        write(glob_fd, buf, TFTP_BUFF_SIZE);
        
        close(loc_fd);
        close(glob_fd);
        
        remove(loc_fd);    
    }
    
    return OK;
}

    FILE *global_files[8];
    FILE *fsrc;

    
    for (i = 0; i < TFTP_FILES_COUNT; i++)
    {
        strcat(file_name, (char*)48+i);
        
        fsrc = open(file_name, O_RDONLY, 0644);
        global_files[i] = open(fname, O_RDONLY, 0644);
        
        cp(fsrc, global_files[i]);
        
        close(fsrc);
        close(global_files[i]);
        
        remove(fsrc);    
    }