c.c

这个是在linux下面的用c语言读写虚拟软盘的源程序

#include<stdio.h>
struct f{
char filename[8];
char fileex[3];
char shuxing;
char baoliu[10];
char shijian[2];
char riqi[2];
char qishi[2];
char daxiao[4];
}file[244];
int QFAT(int f,char qs[2])
{
  char fato[3],fati[3];
  int i,seek,qss[2],g,fat[3];
  for(i=0;i<2;i++)
   {
    if(qs[i]<0)qss[i]=qs[i]+256;
    else qss[i]=qs[i];
   }
  while(1)
  {
   printf("Q:::qss[1]:%d|qss[0]:%d|\n",qss[1],qss[0]);
   if((qss[0]%2)==0)g=0;
   else g=1;
   printf("seek:%d|\n",seek=(qss[0]/2)*3+qss[1]*384);
   lseek(f,512+seek,SEEK_SET);
   read(f,fato,3);
   for(i=0;i<3;i++)
   {
     if(fato[i]<0)fat[i]=fato[i]+256;
     else fat[i]=fato[i];
   }
   if(g==0)
   {
     fati[0]=0x00;
     fati[1]=fat[1]&0x000000F0;
     fati[2]=fat[2];
   }
   else
   {
     fati[0]=fat[0];
     fati[1]=fat[1]&0x0000000F;
     fati[2]=0x00;
   }
   lseek(f,512+seek,SEEK_SET);
   write(f,fati,3);
   lseek(f,5120+seek,SEEK_SET);
   write(f,fati,3);
   if(g==0)
   {
     qss[0]=fat[0];
     qss[1]=fat[1]%16;
   }
   else
   {
     qss[0]=(fat[1]%256)/16+(fat[2]%16)*16;
     qss[1]=fat[2]/16;
   }
  // for(i=0;i<2;i++){if(qs[i]<0)qss[i]=qs[i]+256;else qss[i]=qs[i];}
 printf("GGH:::qss[1]:%d|qss[0]:%d\n",qss[1],qss[0]);
   if(qss[0]>=248&&qss[1]>=15||qss[0]==0x00&&qss[1]==0x00)break;
  }
  return 0;
}
int fd_rm(char *name)
{
    int f,where,i=0,j=0,ll=0,l=0,k=0;
	char nam[11];
	char qs[2];
	if((f=open("/dev/fd0",2))!=-1)
	{
        lseek(f,512*19,SEEK_SET);
		read(f,file,7168);
		i=0;
		j=0;
                k=0;
		while(1)
		{
			if(file[i].filename[0]!=0xF5&&
                           file[i].filename[0]!=0x00&&
                           file[i].shuxing!=0x08)
			{
				l=0;
                                while(file[i].filename[l]!=0x20&&l<8)
                                {
                                 nam[l]=file[i].filename[l];
                                 l++;
                                }
                                ll=0;       
                                while(file[i].fileex[ll]!=0x20&&ll<3)
                                {
                                 if(ll==0){l++;nam[ll+l-1]='.';}
                                 nam[ll+l]=file[i].fileex[ll];
                                 ll++;
                                }
              			nam[l+ll]='\0';
		        	while(nam[j]!=0x20&&name[j]!='\0')
				{
                                 if(name[j]=='\0')break;
                                 if(nam[j]!=name[j])break;
			       	 j++;
				}
				if(nam[j]=='\0'&&
                                   name[j]=='\0')
				{
					qs[0]=file[i].qishi[0];
					qs[1]=file[i].qishi[1];
					file[i].filename[0]=0xE5;
//                                       file[i].filename[1]=0x00;
  //                                      file[i].filename[2]=0x00;
    //                                    file[i].filename[3]=0x00;
      //                                  file[i].filename[4]=0x00;
        //                                file[i].filename[5]=0x00;
          //                              file[i].filename[6]=0x00;
            //                            file[i].filename[7]=0x00;
              //                          file[i].filename[8]=0x00;
                //                        file[i].filename[9]=0x00;
                  //                      file[i].filename[10]=0x00;
                                        lseek(f,512*19,SEEK_SET);
					write(f,file,7168);
					if(QFAT(f,qs)==-1)return -1;
					break; 
				}
			}
			j=0;
			i++;
			if(i==244)break;
		}
		if(i==244)
		{
			printf("error to find file\n");
			return -1;
		}
		else return 0;
	}
	else printf("ERROR TO OEPN EDVICE!\n");
	return -1;
}
void main()
{
  char *a,b[11];
  a=b;
  scanf("%s",a);
  printf("%d\n",fd_rm(a));
}