format.c

操作系统简单的登入程序

#include <stdio.h>
#include <string.h>
#include "filesys.h"            


format()
{
	char* buff;

	super= (struct filesys* )malloc(sizeof(struct filesys));
	
	fd=fopen("filesystem","w+");

	buff= (char* )malloc(BLOCKNUM*BLOCKSIZE*sizeof(char));
	
	if(buff ==NULL)
	{
		printf("\n file system  file creat failed!!!\n");
	}
	else
	{
	
		fseek(fd,0,SEEK_SET);
		
		fwrite(buff,BLOCKNUM*BLOCKSIZE*sizeof(char),1,fd);
	
		super->s_isize=BLOCKNUM;

		super->s_fsize=BLOCKNUM-DATABLOCKSTART;

		super->s_nfree=super->s_fsize;

		super->s_pfree=DATABLOCKSTART;

		super->s_ninode=INODENUMBER;

		super->s_pinode=0;
	
		fseek(fd,0,SEEK_SET);

		fwrite(super,sizeof(struct filesys),1,fd);

		
		fseek(fd,BLOCKSIZE,SEEK_SET);
		memset(block_buf,'0',BLOCKNUM); 
		memset(block_buf,'1',DATABLOCKSTART); 
		fwrite(block_buf,sizeof(char),BLOCKNUM,fd);

		
		fseek(fd,2*BLOCKSIZE,SEEK_SET);
		memset(inode_buf,'0',BLOCKNUM);
		fwrite(inode_buf,sizeof(char),BLOCKNUM,fd);
	    
		super->s_free=block_buf;
		super->s_inode=inode_buf;
	
		newdir1("root","admin","root");
		newdir2("root","admin");	
	}
	
	//fclose(fd);



}