Linux系统调用和库函数

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
using namespace std;

void copy(char *a, char *b);

void copy(char *a, char *b)
{
    int fds, fdd;
    char buf[ * ];

    size_t hasread = ;
    fds = open(a, O_RDONLY);
    fdd = open(b, O_WRONLY, O_CREAT);
    if (fds && fdd)
    {
        while ((hasread = read(fds, buf, sizeof(buf))) > )
        {
            write(fdd, buf, hasread);
            cout << buf << endl;
        }
        close(fds);
        close(fdd);
    }
}

int main()
{
    char a[];
    char b[];

    scanf("%s", a);
    scanf("%s", b);

    copy(a, b);

    return ;
}