fs.cpp

一个微型操作系统源码

#ifndef _fs_
#define _fs_

#include "disk.cpp"
#include "shell.cpp"
#include "fat12.cpp"

#define FLOPPY 1
#define File_Not_Found 1
#define Folder_Not_Found 2
#define Destination_File_Exist 3
#define Destination_Folder_Exist 4
#define Access_Violation    5
#define No_Disk_Space 6
#define Des_Path_Not_Exist  7
#define RW 33
#define RO 32

struct flop
{
char h;
char s;
char t;
int noe;
int found;
int error;
unsigned int cnum;
char name[12];
};

char file_valid1;
char file_name1[11];
unsigned int file_next_lba1;
char *file_buffer1;
char file_pointer1;
char feof1;
long file_size1;
char ch = 1,ct = 0,cs = 2;
unsigned int  ccls = 0x0000;
char cwd[100];

extern char Error_Code;
extern  char floppy_hardd_tog;

void fclose();
void fopen(char*);
char fget_char();
void make1(char*,char*);
void ls1();
void ls2();
void rem1(char *str);
void rem2(char *str);
void types(char *str);
void rem2(char*);
void setcwd(unsigned int);
void dir();
void dir2();
void dir1();
void rem(char *str);
unsigned int copydata(unsigned int);
void ele(char[],char[]);

typedef struct flop hts;
Directory curr_dir;


void chmod(char buffer[32],char attr)
{
 buffer[11] = attr;
}

void sethts(unsigned int cnum,hts *temp)
{
 static unsigned int spt = 18,noh = 2;
 static unsigned int secaddress;
 static unsigned int laddress = 33;
 secaddress = laddress + cnum-1;
 temp->s = ((secaddress)%spt);
 temp->h = (secaddress/spt)%noh;
 temp->t = (secaddress/(spt*noh));
}

hts validate(char* path,int dorf)
{
 static hts temp,temp1;
 static hts temp2;
 static char *vp = 0;
 static int dirc;
 static int icnt;
 static char buffer[512];
 static char name[12],fname[11];
 static unsigned int tcnum;
 static int i,j,found,w,flag;
 static int curr;
 dirc=0;
 found = 0;
 curr = 0;
 vp = path;
 temp.error = 0;
 for(i=0;i<11;i++)temp.name[i]  =  0;
 temp.found = 0;
 for(i=0;i<12;i++)fname[i] = 0;
 if(streq(path,"A:\\"))
 {
  temp.h = 1;
  temp.s = 2;
  temp.t = 0;
  temp.cnum = 0x0;
  temp1.cnum = 0x0;
 }
 else
 {
  temp.h = ch;
  temp.s = cs;
  temp.t = ct;
  curr = 1;
  temp.cnum = ccls;
  temp1.cnum = ccls;
 }
 if(!curr)
 {
  while(*path != '\\' && *path != 0 && *path != 32)path++;
  path++;
 }
 i = 0;
 while(*path != '\\' && *path != 0 && *path != 32)
 {
  fname[i++] = *path;path++;
 }
 ele(fname,name);
 name[11] = 0;
 temp1.h = temp.h;
 temp1.t = temp.t;
 temp1.s = temp.s;
 temp2.s = temp.s;temp2.t = temp.t;temp2.h = temp.h;
 temp2.noe = 0;
 while(!found)
 {
  dirc = 0;
  flopread(temp1.h,temp1.t,temp1.s,1,buffer);
  for(i = 0;i<512&&buffer[i] != 0&&(!found);i+=32)
  {
   flag  = 0;
   for(w=0;w<11;w++)
    if(buffer[i+w] != name[w])
    {
     flag = 1;
     break;
    }
   if(!flag)
   {
    if((buffer[i+11]&16)!=0)
    {
     dorf=0;
     dirc = 1;
     j=0;
     for(icnt=0;icnt<11;icnt++)temp2.name[icnt] = name[icnt];
     if(*path == 0)fname[j]=0;
     if(*path == '\\')path++;
     while(*path != '\\' && *path != 0 && *path != 32)
     {
      fname[j++] = *path;
      path++;
     }
     ele(fname,name);
     tcnum =  (unsigned int)(buffer[i+27]<<8) + (unsigned char)(buffer[i+26]);
     temp2.s = temp.s;temp2.t = temp.t;temp2.h = temp.h;temp2.noe = i/32;
     if(tcnum == 0x000)
     {
      temp.s = 2;temp.h = 0;temp.t = 1;
     }
     else
     {
      sethts(tcnum,&temp);
     }
     temp1.h = temp.h;
     temp1.s = temp.s;
     temp1.t = temp.t;
     break;
    }
    else if(*path == 0)
    {
     temp.found = 1;
     temp.noe = i/32;
     found=1;
     break;
    }
   }
  }
  if(!dirc && !found)
  {
   if(i != 512 && buffer[i] == 0)
   {
    if(strlen(name) == 0)
    {
     temp.s = temp2.s;temp.t = temp2.t;temp.h = temp2.h;temp.noe = temp2.noe;
     for(icnt=0;icnt<11;icnt++)temp.name[icnt] = temp2.name[icnt];
    }
    if(((path[0] != 0) && (path[0] != 32))||(dorf)) temp.error = 1;
    for(i=0;i<11;i++) temp.name[i]  =  name[i];
    found = 1;
   }
   else if(i == 512)
   {
    if(temp1.cnum == 0)
    {
     temp1.s++;
     if(temp1.s>18)
     {
      temp1.s=0;
      if(temp1.h==1)
      {
       temp1.t++;
       temp1.h=0;
      }
      else
      {
       temp1.h = 1;
      }
     }
    }
    else
    {
     temp1.cnum = getcnum(temp1.cnum);
     if(temp1.cnum != 0xfff) sethts(temp1.cnum,&temp1);
     else found = 1;
     continue;
    }
   }
  }
 }
 path  = vp;
 return temp;
}


hts findentries(hts thts)
{
 static int h,t,s;
 static int i,j,found;
 static unsigned int *cnum;
 static char buffer[512];
 found = 0;
 for(i=0;i<14;i++)
 {
  h = thts.h;
  s = thts.s;
  t = thts.t;
  flopread(h,t,s,1,buffer);
  for(j=0;j<512;j+=32)
  {
   if((buffer[j] == 0 || buffer[j] == '