opsector.c

用于计算一个很长的式子

/***********************************************************/
/*软件功能：这是一个可以直接访问硬盘的程序                 */
/*          可以修改硬盘扇区的信息。                       */
/*软件支持：该程序只能在windows 9x 或DOS 操作系统上运行    */
/*程序编辑:Ricky                                           */
/*email:[e-mail]                                    */
/*QQ:384934531                                             */
/*时间:2007.1.6                                            */
/***********************************************************/

#include<bios.h>
#include<stdio.h>
#define DRIVE    0x80
#define PAGEDOWN 0x5100
#define PAGEUP   0x4900
#define DOWN     0x5000
#define UP       0x4800
#define ENTER    0x1c0d
#define ESC      0x11b

int cmd, head=0, track=0, sector=0, nsects=1, status=0, linenum=0;
unsigned char *buf;

int RestDisk();
int ReadDisk();
void ModifyBuff();
void ShowInfo(int x);
int KeyPress();
void WriteDisk();
void SetOperateSector();
int CreateBuff(int n);

main()
{

    SetOperateSector();

    if(CreateBuff(nsects)==0)
    {
        printf("can't create buf!");
        exit(1);
    }

    if(RestDisk()==0) exit(1);
    if(ReadDisk()==0) exit(1);

    ShowInfo(0);
    while(KeyPress());

}

void SetOperateSector()
{
    printf("what sector do you want to operate?");
    printf("\nhead:");
    scanf("%d",&head);
    printf("track:");
    scanf("%d",&track);
    printf("sector:");
    scanf("%d",&sector);
    printf("nsects:");
    scanf("%d",&nsects);
}
int CreateBuff(int n)
{
    buf=(unsigned char *)calloc(n*512,sizeof(unsigned char));
    if(buf==NULL)
        return 0;
    else
        return 1;
}
int RestDisk()
{
    status=biosdisk(cmd=0,DRIVE,head,track,sector,nsects,buf);
    if(status==0)
    {

        return 1;
    }
    else
    {
        printf("Disk rest error!\n");
        return 0;
    }
}
int ReadDisk()
{
    status=biosdisk(cmd=2,DRIVE,head,track,sector,nsects,buf);
    if(status!=0)
    {
        printf("Disk read error!\n");
        return 0;
     }
    else
        return 1;

}
void ShowInfo(int x)
{
    int i;
    int y=3;
    clrscr();
    /*printf("The sector information as following\n");   */

    /* 制作一个输出扇区信息的表栏*/
    printf("    0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F    0123456789ABCDEF\n");

    /*输出buf[i]中的hex码*/
    for(i=x;i<x+128;i++)
    {
        if(i%16==0)printf("\n%2x:",i/16);
        printf(" %2x",buf[i]);
    }

    /*输出对应的字符表*/
    for(i=x;i<x+128;i++)
    {
        if(i%16==0)
            gotoxy(55,y++);

        if(buf[i]<=13&&buf[i]>=7)
            /*特殊字符处理*/
            putchar('.');
        else
            putchar(buf[i]);
    }

    printf("\n");

}
void ModifyBuff()
{
    int addr;
    unsigned char c;

    printf("\naddress:");
    scanf("%x",&addr);

    if(addr>(0x200*nsects-1)||addr<0)
        printf("Address is not in this sector!");
    else
    {
        printf("DATA Old:%x New:",buf[addr]);
        scanf("%x",&c);
        buf[addr]=c;
        ShowInfo(linenum*16);
     }

}
int KeyPress()
{
    switch(bioskey(0))
    {
        case PAGEDOWN:  /*向下移动8行*/
            if(linenum<(17+32*(nsects-1)))
                linenum+=8;
            else
                linenum=24+32*(nsects-1);
            ShowInfo(linenum*16);
            return 1;
        case DOWN:  /*向下移动1行*/
            if(linenum<(24+32*(nsects-1)))
            {
                linenum++;
                ShowInfo(linenum*16);
             }
             return 1;
        case PAGEUP:    /*向上移动8行*/
            if(linenum<=7)
                linenum=0;
            else
                linenum-=8;
            ShowInfo(linenum*16);
            return 1;
        case UP:   /*向上移动1行*/
            if(linenum>0)
            {
                linenum--;
                ShowInfo(linenum*16);
             }
             return 1;
        case ENTER:  /*调用修改函数*/
            ModifyBuff();
            return 1;
        case ESC:   /*退出程序时询问事项*/
            printf("You operated sector:head:%d,track:%d,sector:%d,nsects:%d\n",
                   head,track,sector,nsects);
            printf("Do you want to rewrite this sector(Y/N)");
            if(getch()=='Y'||getch()=='y')
                WriteDisk();
            return 0;
     }

}
void WriteDisk()
{
    status=biosdisk(cmd=3,DRIVE,head,track,sector,nsects,buf);
    if(status!=0)
        printf("Rewrite sector error!");

}