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#include <string.h>

#include 
   

#include 
   

#include 
   

#define BUFFER_SIZE 1024

int main(int argc, char ** argv)

{

FILE *from_fd;

FILE *to_fd;

long file_len=0;

char buffer[BUFFER_SIZE];

// char *ptr;

/*判断入参*/

if(argc!=3)

{

printf("Usage:%s fromfile tofile\n",argv[0]);

exit(1);

}

/*打开源文件*/

if((from_fd=fopen(argv[1],"rb"))==NULL)

{

printf("Open %s Error\n",argv[1]);

exit(1);

}

/*创建目的文件

*  w      Truncate  file  to zero length or create text file for writing.

The stream is positioned at the beginning of the file.

*/

if((to_fd=fopen(argv[2],"wb"))==NULL)

{

printf("Open %s Error\n",argv[2]);

exit(1);

}

/*测得文件大小*/

fseek(from_fd,0L,SEEK_END);

file_len=ftell(from_fd);

fseek(from_fd,0L,SEEK_SET);

printf("from fiel size id %d\n",file_len);

/*进行文件拷贝*/

while(!feof(from_fd))

{

fread(buffer,BUFFER_SIZE,1,from_fd);

if(BUFFER_SIZE >= file_len) //文件太小

{

fwrite(buffer,file_len,1,to_fd);

}

else                       //文件太大

{

fwrite(buffer,BUFFER_SIZE,1,to_fd);

file_len-=BUFFER_SIZE;

}

bzero(buffer,BUFFER_SIZE);

}

fclose(from_fd);

fclose(to_fd);

exit(0);

}

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