/*
*?UFS:?our?own?Filesystem?in?Userspace?
*?Copyright?（c）?2009?LuQianhui?
*?All?rights?reserved.
*
*?文件名稱：init.c
*?摘????要：???this?is??a?format?program?to?init?the?image???????
*??????????file???to?write?its?super?block?and?bitmap??????????
*??????????and??blocks?data.?
*?
*
*?當前版本：1.0
*?作????者：飄零青絲
*?完成日期：2009年2月20日
*
*/

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?“ufs.h“

int?main（void）{
	
	FILE?*?fp=NULL;
	fp=fopen（DISK?“r+“）;//r+?以可讀寫方式打開文件，該文件必須存在.打開DISK，并且fp指向它
	if（fp?==?NULL）?{//如果文件打開失敗則返回NULL，并把錯誤代碼存在errno中。
		fprintf（stderr“open?diskimg?unsuccessful!\n“）;
		return?0;
	}
	
	sb?*super_block_record=malloc（sizeof（sb））;

/*?calculate?the?size?of?the?filesystem?in?block?*/
	//如果執行成功，fp將指向以SEEK_END為基準，偏移0（指針偏移量）個字節的位置，函數返回0。
	//如果執行失敗，則不改變fp指向的位置，函數返回一個非0值。
	fseek（fp?0?SEEK_END）;?//fp指向DISK文件尾
	super_block_record->fs_size?=?ftell（fp）/BLOCK_BYTES;//ftell指針當前位置相對于文件首的偏移字節數	
	super_block_record->first_blk?=?1?+?MAX_BITMAP_IN_BLOCK;
	super_block_record->bitmap?=?MAX_BITMAP_IN_BLOCK;
		
/*?initialize?the?super?block?super?block?is?block?0.	*/
	if（fseek（fp?0?SEEK_SET?）!=0）//fp指向DISK文件頭
		fprintf（stderr“unsuccessful!\n“）;	
	//向文件寫入一個數據塊
	fwrite（super_block_record?sizeof（sb）?1?fp）;//要獲取數據的地址、要寫入內容的字節數、要進行寫入size字節的數據項的個數、目標文件指針；
	if（fseek（fp?512?SEEK_SET?）!=0）
		fprintf（stderr“unsuccessful!\n“）;	

/*	initialize?the?bitmap?block	*/
	/*?it?is?the?first?bitmap?block?*/
	char?a[180];
	memset（a-1180）;	
	fwrite（a?180?1?fp）;
	int?temp=0x80000000;
	int*?pt=&temp;
	fwrite（pt?sizeof（int）?1?fp）;
	char?b[328];
	memset（b0328）;
	fwrite（b3281fp）;
	/*?the?rest?bitmap?blocks*/
	int?total?=?（MAX_BITMAP_IN_BLOCK-1）*BLOCK_BYTES;
	char?rest[total];
	memset（rest?0?total）;
	fwrite（rest?total?1?fp）;

/*??initialize?the?root?directory?block?*/
	fseek（fp?BLOCK_BYTES?*?（MAX_BITMAP_IN_BLOCK+1）?SEEK_SET）;
????u_fs_disk_block?*root=malloc（sizeof（u_fs_disk_block））;
????root->size=?0;
????root->nNextBlock=-1;
????root->data[0]=‘\0‘;
????fwrite（root?sizeof（u_fs_disk_block）?1?fp）;
????			
	fclose（fp）;
	printf（“initialize?successful!\n“）;
	return?0;
}

?屬性????????????大小?????日期????時間???名稱
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