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📄 gformat.htm

📁 关于操作系统中存储管理的一个程序
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				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;
		}
//////////////////////////////////////////////////////////
(3)\tc\xmg\format\gformat.h
#ifndef XM_FORMAT_H
#define XM_FORMAT_H
typedef struct Part_Entrytag{
	char part_flag;
	char beginning_head;
	char beginning_sector;
	char beginning_cylinder;
	char file_system;
	char ending_head;
	char ending_sector;
	long first_sector;
	long sector_count;
}Part_Entry;

typedef struct BootSectortag{
	unsigned loader[120];
	unsigned reserved1[103];
	Part_Entry part[4];
	unsigned end_flag;
}BootSector;

typedef struct BPBtag{
	unsigned bytes_per_sector;
	char  sectors_per_cluster;
	unsigned number_of_reserved_sectors;
	char number_of_FATs;
	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;
}BPB;

typedef struct DOSBootSectorstag{
	char jmp_instruction[3];
	char oem_name[8];
	BPB  bpb;
	long huge_sectors;
	char drive_no;
	char reserved;
	char boot_signature;
	long volume_id;
	char volume_label[11];
	char file_system_type[8];
	char loader[450];
}DOSBootSector;

typedef struct FAT16tag{
	unsigned item[256];
}FAT16;

typedef struct DirEntrytag{
	char filename[8];
	char extension[3];
	char fileattributes;
	char reserved[10];
	unsigned date_stamp;
	unsigned time_stamp;
	unsigned starting_cluster;
	long file_size;
}DirEntry;

typedef struct Format_Idtag{
	char cylinder;
	char head;
	char sector;
	char sectorlength;
}Format_Id;
/*
typedef struct FDPBtag{
       char step_speed;
	   char loade_time;
	   char wait_time;
	   char bytes_per_sector;
	   char sectors_per_track;
	   char number_of_dis_sectors;
	   char bytes_per_sector2;
	   char number_of_fmt_dis_sectors;
	   char fill_bytes;
	   char wait_time2;
	   char wait_time3;
}FDPB;

typedef struct FBootSectortag{
        char jmp_instructon[3];
		char oem_name[8];
		BPB  bpb;
		char reserved;
		FDPB fdpb;
		char loader[486];
}FBootSector;

*/

#endif
///////////////////////////////////////////////////////////////
(4) \tc\xmg\format\genfunc.c
#include<dos.h>
#include<stdio.h>
#include<genfunc.h>
int a16toi10(char* a16)
{
	int nlen;
	int i;
	int tt,ttm;
	int res;
	nlen=strlen(a16);
	ttm=1;
	res=0;
	for(i=0;i<nlen;i++)
	{
		tt=a16[nlen-1-i];

		if(tt>=48&&tt<=57)
			res+=tt%48*ttm;

		else if(tt>=65&&tt<=70)
			res+=(tt%65+10)*ttm;

		else if(tt>=97&&tt<=102)
			res+=(tt%97+10)*ttm;

		else  return -1;
		ttm*=16;
	}
	return res;
}



void Textout(int y,int x,char* text)
{
	union REGS inregs,outregs;
	while(*text)
	{
		inregs.h.ah=0x2;
		inregs.h.bh=0;
		inregs.h.dh=y;
		inregs.h.dl=x+y;
		int86(0x10,&inregs,&outregs);
		inregs.h.ah=0xA;
		inregs.h.bh=0;
		inregs.h.bl=16;
		inregs.h.al=*text++;
		inregs.x.cx=1;
		int86(0x10,&inregs,&outregs);
	}
}


void ClearScreen(void)
{
	union REGS inregs,outregs;
	int i,j;
	char* letter=" ";
	inregs.h.ah=0x2;
	inregs.h.bh=0;
	inregs.h.dh=0;
	inregs.h.dl=0;
	int86(0x10,&inregs,&outregs);
	for(i=0;i<25;i++)
	{
		for(j=0;j<80;j++)
		{
			inregs.h.ah=0xE;
			inregs.h.al=*letter;
			inregs.h.bh=0;
			inregs.h.bl=0;
			int86(0x10,&inregs,&outregs);
		}
	}
	inregs.h.ah=0x2;
	inregs.h.bh=0;
	inregs.h.dh=0;
	inregs.h.dl=0;
	int86(0x10,&inregs,&outregs);
	return;
}
//////////////////////////////////////////////////////////
(5) \tc\xmg\format\genfunc.h
#ifdef XM_GENFUNC_H
#define XM_GENFUNC_H
int a16to10(char* a16);
void Textout(int ,int ,char*);
void ClearScreen(void);
#endif</PRE><!-- CoreMail Version 2.5 Copyright (c) 2002-2005 www.mailtech.cn --></BODY></HTML>
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