Linux文件编程练手1-实现自己的cp指令

cp src.c des.c
指令 源文件 目标文件

1.C语言参数
2.思路：
a.打开src.c
b.读src到buf
c.打开/创建des.c
d.将buf写入到des.c
e.close两个文件

#include 
#include 
#include 
#include 
#include 
#include 
#include 

int main(int argc,char **argv)
{
	int fdSrc;
	int fdDes;

	char *readBuf = NULL;

	if(argc != 3){
		printf("pararm error\n");
		exit(-1);
	}

	fdSrc = open(argv[1],O_RDWR);

	int sizeReadBuf = lseek(fdSrc,0,SEEK_END);	//计算缓冲区的大小
	lseek(fdSrc,0,SEEK_SET);					//将光标定位到文件头部，防止读取不到文件
	readBuf = (char *)malloc(sizeof(char *)*sizeReadBuf+8);

	int n_read = read(fdSrc,readBuf,sizeReadBuf);

	fdDes = open(argv[2],O_RDWR|O_CREAT|O_TRUNC,0600);
	int n_write = write(fdDes,readBuf,sizeReadBuf);

	close(fdSrc);
	close(fdDes);

	printf("mycp success\n");

	return 0;
}