实现一个类似与split的程序——分割文件

#include

#include

#include

#include

#include

#include

int main(int argc,char *argv[])

{

int fd,fd_temp;

int i;

size_t nread, size;

char filename[20]="\0";

char *buf=NULL;

if((fd=open(argv[1],O_RDONLY)) == -1)

{

perror("open:");

exit (1);

}

printf("input the size: ");

scanf("%d",&size);

buf=(char *)malloc(size);

while( (nread=read(fd, buf , size)) > 0)

{

memset(buf, 0, size);

sprintf(filename, "%s%d.txt", argv[1], i++);

if( (fd_temp=open(filename, O_CREAT, 0644)) == -1)

{

perror("open filename");

exit (2);

};

write(fd_temp, buf, nread);

close(fd_temp);

}

free(buf);

close(fd);

return 0;

}