📄 gformat.c
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#include<dos.h>
#include<stdio.h>
#include"gformat.h"
#include"genfunc.h"
long cylinder_count;
int head_count,sector_count;
long disk_size,part_size,filespc_size;
unsigned bytes_per_sector;
int sectors_per_cluster;
unsigned maximum_number_of_root_entries;
unsigned total_number_of_sectors;
char media_descriptor;
unsigned sectors_per_FAT;
unsigned sectors_per_track;
unsigned number_of_heads;
long number_of_hidden_sectors;
long volume_id=655627769;
char volume_lable[11];
void main(int argc,char* agrv[])/*for example:gformat 2(drive_no) p(bpl) l(vpno)*/
{
union REGS inregs,outregs;
struct SREGS segs;
BootSector priboot;
DOSBootSector fpriboot;
DOSBootSector dosboot;
FAT16 fat16;
DirEntry* direntry;
int bpl; /*主分区p,P, 逻辑分区l,L,此程序只能格式化主分区，逻辑分区原理与此相同*/
int drive_no; /*驱动器号1，2，a*/
int vpno,rpno,ttno; /*Virtual part_no,Real part_no*/
int fs;
int speed_idt;
char* sspeed_idt;
char* iddata;
int bfs;
int i,j,k,m;
int bcylinder,bhead,bsector;
int ttcylinder,tthead,ttsector;
int ttcylinder1,tthead1,ttsector1,ttcylinder2,tthead2,ttsector2;
char tt[2];
FILE* fp;
long ttlogsector;
void(argc);
bpl=argv[2][0]; /*是主分区p,P,还是逻辑分区l,L*/
drive_no=atoi(argv[1]); /*驱动器号*/
vpno=atoi(argv[3]); /*虚拟分区号*/
if(bpl==80||bpl=120) /*bpl="p" or bpl="P" 将要格式化主分区*/
{
inregs.h.ah=0x8;
inregs.h.dl=0x80+drive_no-1; /*驱动器号为1时为第一块硬盘，dl寄存器为0x80*/
int86(0x13,&inregs,&outregs);
head_count=outregs.h.dh+1; /*磁头数*/
cylinder_count=outregs.h.ch+1+(outregs.h.cl>>6)*256; /*柱面数(磁道数)*/
sector_count=outregs.h.cl&63; /*每道扇区数*/
disk_size=cylinder_count*sector_count*head_count;/*磁盘空间大小=柱面数*每道扇区数*磁头数*/
inregs.h.ah=0x2; /*读磁盘扇区*/
inregs.h.al=1; /*读取的扇区数为1*/
inregs.h.ch=0; /*位置：0道*/
inregs.h.cl=1; /*位置:1扇区*/
inregs.h.dh=0; /*位置：0磁头*/
inregs.h.dl=0x80+drive_no-1; /*位置:驱动器号(0x80开始为第一块硬盘)*/
inregs.x.bx=(unsigned)&priboot; /*读出的数据存放地址*/
segread(&segs);
int86(0x13,&inregs,&outregs,&segs); /*将主引导扇区(0道0头1扇区)内容读到priboot数据结构中*/
/*此时，vpno=1的意义是第一个未格式化的分区*/
/*下叙过程没有查找逻辑分区的主引导扇区，尚不能提供对逻辑分区格式化*/
rpno=-1;
ttno=0;
for(i=0;i<4;i++)
{
if(priboot.part[i].file_system!=0x0)
{
ttno++;
if(ttno==vpno)
{
rpno=i;
break;
}
}
}
if(rpno==-1)
{
Textout(23,2,"Error part number");
return;
}
part_size=priboot.part[rpn0].sector_count;/*分区大小*/
/*初始化引导扇区的内容*/
bytes_per_sector=512; /*每个扇区字节数*/
sector_per_cluster=8; /*每簇扇区数*/
number_of_reserved=sectors=1; /*保留扇区数*/
number_of_FATs=2; /*文件分配表数，第二个FAT为备份*/
maxinum_number_of_root_entries=512; /*根目录中目录项数*/
total_number_of_sectors=part_size; /*总扇区数*/
media_descriptor=0xf8; /*磁盘介质标志*/
sectors_per_track=sector_count; /*每道扇区数*/
number_of_heads=head_count; /*磁头数*/
number_of_hidden_sectors=priboot.part[rpno].first_sector<=sector_count?sector_count:0;/*隐藏扇区数*/
sectors_per_FAT=2+((part_size-
number_of_reserved_sectors-maximum_number_of_root_entries*32/bytes_per_sector)/
sectors_per_cluster*2)/bytes_per_sector;/*每个FAT扇区数*/
filespc_size=part_size-number_of_reserved_sectors-maximum_number_of_root_entries*32/
bytes_per_sector-sectors_per_FAT*number_of_FATS;/*数据空间大小*/
/*--------------check all cylinders------------------*/
sspeed_idt=(char*)malloc(5); /*界面显示格式化进度*/
bcylinder=priboot.part[rpno].beginning_cylinder; /*格式化开始柱面*/
bhead=priboot.part[rpno].beginning_head; /*开始磁头*/
bsector=1; /*开始扇区*/
ttcylinder=bcylinder;
tthead=bhead;
ttsector=bsector;
/*检查DOS引导扇区，FAT和根目录区的磁盘空间，如果有损坏则退出程序*/
for(i=0;i<number_of_reserved_sectors+sectors_per_FAT*number_of_FATs+
maximum_number_of_root_entries*32/bytes_per_sector;i++)
{
inregs.h.ah=0x4;
inregs.h.al=1;
inregs.h.ch=ttcylinder;
inregs.h.cl=ttsector;
inregs.h.dh=tthead;
inregs.h.dl=0x80+drive_no-1;
int86x(0x13,&inregs,&outregs,&segs);
if(outregs.h.ah!=0x0)
{
if(i<number_of_reserved_sectors)
Textout(23,2,"Boot Sector destroyed! Can't format!");
else if(i<sectors_per_FAT*number_of_FATs)
Textout(23,2,"FAT Sectors destroyed! Can't format!");
else
Textout(23,2,"Root Entry Sectors destroyed! Can't format!");
return;
}
/***下一个循环过程检查下一个扇区*/
ttsector++;
if(ttsector>sector_count)
{
ttsector=1;
tthead++;
if(tthead>head_count-1)
{
tthead=0;
ttcylinder++;
}
}
}
/*************************check file section sector**********************/
/*检查数据区的磁盘空间，识别破坏簇*/
/*FAT表1*/
ttcylinder=bcylinder;
tthead1=bhead;
ttsector1=bsector+1;
/*FAT表2，假定有两个FAT表*/
ttcylinder2=bcylinder+(bsector+1+sectors_per_FAT-1)/sector_count/head_count;
tthead2=(bhead+(bsector+1+sectors_per_FAT-1)/sector_count)%head_count;
ttsector2=(bsector+1+sectors_per_FAT-1)%sector_count+1;
/*初始化一个扇区的FAT表项缓冲区,每个表项为2个字节*/
for(i=0;i<bytes_per_sector/2;i++)
fat16.item[i]=0xfff0;
for(i=0;i<filespc_size/sectors_per_cluster;i++) /*按簇进行格式化,每次格式化一个簇*/
{
inregs.h.ah=0x4;
inregs.h.al=sectors_per_cluster;/*每簇扇区数*/
inregs.h.ch=ttcylinder;
inregs.h.cl=ttsector;
inregs.h.dh=tthead;
inregs.h.dl=0x80+drive_no-1;
int86x(0x13,&inregs,&outregs,*segs);
if(i==0) /*前两个FAT表项被占用*/
{
fat16.item[0]=0xff+edia_descriptor<<8;
fat16.item[1]=0xffff;
}
/*标志坏簇*/
if(outregs.h.ah!=0x0)
{
fat16.item[(i+2)%(bytes_per_sector/2)]=0xfff7;
}
else
{
fat16.item[(i+2)%(bytes_per_sector/2)]=0x0;
}
/*当FAT表项缓冲区满，写入磁盘*/
if((i>0&&(i+1)*2%bytes_per_sector==0)||(i>=filespc_size/sectors_per_cluster-1))
{
/*写入第一个FAT表*/
inregs.h.ah=0x3;
inregs.h.al=1;
inregs.h.ch=ttcylinder;
inregs.h.cl=ttsector1;
inregs.h.dh=tthead1;
inregs.h.dl=0x80+drive_no-1;
inregs.x.bx=(unsigned)&fat16;
segread(&segs);
int86x(0x13,&inregs,&outregs,&segs);
/*写入第二个FAT表，备分，通常为2个FAT表*/
inregs.h.ah=0x3;
inregs.h.al=1;
inregs.h.ch=ttcylinder2;
inregs.h.cl=ttsector2;
inregs.h.dh=tthead2;
inregs.h.dl=0x80+drive_no-1;
inregs.x.bx=(unsigned)&fat16;
segread(&segs);
int86x(0x13,&inregs,&outregs,&segs);
/*修改将写入的FAT表1和表2的位置*/
ttsector1++;
if(ttsector1>sector_count)
{
ttsector1=1;
tthead1++;
if(tthead1>head_count-1)
{
tthead1=0;
ttcylinder++;
}
}
ttsector2++;
if(ttsector2>sector_count)
{
ttsector2=1;
tthead2++;
if(tthead2>head_count-1)
{
tthead2=0;
ttcylinder2++;
}
}
/* 清空FAT表缓冲区*/
for(k=0;k<256;k++)
fat16.item[k]=0xfff0;
}
/*修改将要检查的文件区扇区位置*/
ttsector+=sectors_per_cluster;
if(ttsector>sector_count)
{
ttsector=1;
tthead++;
if(tthead>head_count-1)
{
tthead=0;
ttcylinder++;
}
}
/*显示界面上的格式化进度*/
speed_idt=(i+1)/(filespc_size)/sectors_per_cluster/100);
speed_itd=speed_idt<=100?speed_idt:100;
itoa(speed_idt,sspeed_idt,10);
strcat(sspeed_idt,"%");
inregs.h.ah=0x2;
inregs.h.bh=0;
inregs.h.dh=23;
inregs.h.dl=0;
int86(0x10,&inregs,&outregs);
while(*sspeed_idt)
{
inregs.h.ah=0xE;
inregs.h.bh=0;
inregs.h.bl=6;
inregs.h.al=*sspeed_idt++;
int86(0x10,&inregs,&outregs);
}
}
/*将DOS引导扇区的信息写入到磁盘*/
dosboot.jmp_instruction[0]=-21; /*跳转指令*/
dosboot.jmp_instruction[1]=60;
dosboot.jmp_instruction[2]=-112;
strcpy(dosboot.oem_name,"XMG 1.0"); /*软件厂商及版本号*/
dosboot.bpb.bytes_per_sector=bytes_per_sector; /*每扇区字节数*/
dosboot.bpb.sectors_per_cluster=sectors_per_cluster;/*每簇扇区数*/
dosboot.bpb.number_of_reserved_sectors=number_of_reserved_sectors;/*保留扇区数*/
dosboot.bpb.number_of_FATs=number_of_FATs; /*文件分配表数*/
dosboot.bpb.maximum_number_of_root_entries=maximum_number_of_root_entries;/*根目录中目录项数*/
if(part_size<=32*(1048576/512))
{
dosboot.bpb.total_number_of_sectors=total_number_of_sectors; /*总扇区数*/
dosboot.bpb.total_huge_sectors=0; /*巨扇区数*/
}
else
{
dosboot.bpb.total_number_of_sectors=0;
dosboot.huge_sectors=total_number_of_sectors;
}
dosboot.bpb.media_descriptor=media_descriptor; /*磁盘介质标志*/
dosboot.bpb.sectors_per_FAT=sectors_per_FAT; /*每FAT字节数*/
dosboot.bpb.sectors_per_track=sectors_per_track; /*每磁道扇区数*/
dosboot.bpb.number_of_heads=number_of_heads; /*磁头树*/
dosboot.bpb.number_of_hidden_sectors=number_of_hidden_sectors;/*隐藏扇区数*/
dosboot.drive_no=0x80+drive_no-1; /*驱动器号*/
dosboot.boot_signature=0x29; /*扩展标志*/
dosboot.volume_id=volume_id; /*卷序列号*/
strcpy(dosboot.volume_label,""); /*卷标志*/
strcpy(dosboot.file_system_type,"FAT16"); /*文件系统类型*/
fp=fopen("\\os\\format\\load.bin","rb"); /* 加载程序*/
if(fp==NULL)
printf("\nCan't open load file!\n");
else
{
fread(dosboot.loader,1,450,fp);
fclose(fp);
}
}
inregs.h.ah=0x3;
inregs.h.al=1;
inregs.h.ch=priboot.part[rpno].beginning_cylinder;
inregs.h.cl=priboot.part[rpno].beginning_sector;
inregs.h.dh=priboot.part[rpno].beginning_head;
inregs.h.dl=0x80+drive_no-1;
inregs.x.bx=(unsigned)&dosboot;
segread(&segs);
int86x(013,&inregs,&outregs,&segs);
/*初始化目录缓冲区*/
direntry=(DirEntry*)malloc(bytes_per_sector);
for(i=0;i<bytes_per_sector/32;i++)
{
direntry[i].filename[0]=0x0;
direntry[i].extension[0]=0x0;
direntry[i].fileattributes=0x0;
direntry[i].time_stamp=0;
direntry[i].data_stamp=0;
direntry[i].starting_cluster=0;
direntry[i].file_size=0;
}
/*根目录区起始位置*/
ttcylinder2=bcylinder+(bsector+1+sectors_per_FAT*number_of_FATs-1)/sector_count/head_count;
tthead2=(bhead+(bsector+1+sectors_per_FAT*number_of_FATs-1)/sector_count)%head_count;
ttsector2=(bsector+1+sectors_per_FAT*number_of_FATs-1)%sector_count+1;/*初始化根目录区*/
for(i=0;i<maximum_number_of_root_entries*32/bytes_per_sector;i++)
{
inregs.h.ah=0x3;
inregs.h.al=1;
inregs.h.ch=ttcylinder2;
inregs.h.cl=ttsector2;
inregs.h.dh=tthead2;
inregs.h.dl=0x80+drive_no-1;
inregs.x.bx=(unsigned)direntry;
segread(&segs);
int86x(0x13,&inregs,&outregs,&segs);
ttsector2++;
if(ttsector2>sector_count)
{
ttsector2=1;
tthead2++;
if(tthead2>head_count-1)
{
tthead2=0;
ttcylinder2++;
}
}
}
}
return;
}
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