#include <stdio.h>
#include <stdlib.h>   /* exit()    */
#include <string.h>   /* strncpy() */
#include <sys/stat.h> /* struct stat */
#include <fcntl.h>    /* O_RDONLY */
#include <unistd.h>   /* lseek() */
#include <ctype.h>    /* toupper() */

#include "version.h"

#include "dos33.h"

static unsigned char sector_buffer[BYTES_PER_SECTOR];

static int ones_lookup[16]={
  /* 0x0 = 0000 */ 0,
  /* 0x1 = 0001 */ 1,
  /* 0x2 = 0010 */ 1,
  /* 0x3 = 0011 */ 2,
  /* 0x4 = 0100 */ 1,
  /* 0x5 = 0101 */ 2,
  /* 0x6 = 0110 */ 2,
  /* 0x7 = 0111 */ 3,
  /* 0x8 = 1000 */ 1,
  /* 0x9 = 1001 */ 2,
  /* 0xA = 1010 */ 2,
  /* 0xB = 1011 */ 3,
  /* 0xC = 1100 */ 2,
  /* 0xd = 1101 */ 3,
  /* 0xe = 1110 */ 3,
  /* 0xf = 1111 */ 4,
};

static unsigned char get_high_byte(int value) {
  return (value>>8)&0xff;
}

static unsigned char get_low_byte(int value) {
  return (value&0xff);
}


#define FILE_NORMAL 0
#define FILE_DELETED 1

static unsigned char dos33_file_type(int value) {
 
    unsigned char result;
   
    switch(value&0x7f){ 
       case 0x0: result='T'; break;
       case 0x1: result='I'; break;
       case 0x2: result='A'; break;
       case 0x4: result='B'; break;
       case 0x8: result='S'; break;
       case 0x10: result='R'; break;
       case 0x20: result='N'; break;
       case 0x40: result='L'; break;
       default: result='?'; break;
    }
    return result;
}


static unsigned char dos33_char_to_type(char type,int lock) {
 
    unsigned char result,temp_type;
    
    temp_type=type;
       /* Covert to upper case */
    if (temp_type>='a') temp_type=temp_type-0x20;
   
    switch(temp_type) {    
       case 'T': result=0x0; break;
       case 'I': result=0x1; break;
       case 'A': result=0x2; break;
       case 'B': result=0x4; break;
       case 'S': result=0x8; break;
       case 'R': result=0x10; break;
       case 'N': result=0x20; break;
       case 'L': result=0x40; break;
       default: result=0x0;
    }
    if (lock) result|=0x80;
    return result;
}

    /* dos33 filenames have top bit set on ascii chars */
    /* and are padded with spaces */
static char *dos33_filename_to_ascii(char *dest,unsigned char *src,int len) {
   
    int i=0,last_nonspace=0;
   
    for(i=0;i<len;i++) if (src[i]!=0xA0) last_nonspace=i;
    
    for(i=0;i<last_nonspace+1;i++) {
       dest[i]=src[i]^0x80; /* toggle top bit */
    }
   
    dest[i]='\0';
    return dest;

}

    /* Read VTOC into a buffer */
static int dos33_read_vtoc(int fd) {

    int result;

       /* Seek to VTOC */
    lseek(fd,DISK_OFFSET(VTOC_TRACK,VTOC_SECTOR),SEEK_SET);
       /* read in VTOC */
    result=read(fd,&sector_buffer,BYTES_PER_SECTOR); 

    if (result<0) fprintf(stderr,"Error on I/O\n");

    return 0;
}
    /* Calculate available freespace */
static int dos33_free_space(int fd) {
   
    unsigned char bitmap[4];
    int i,sectors_free=0;
 
       /* Read Vtoc */
    dos33_read_vtoc(fd);
      
    for(i=0;i<TRACKS_PER_DISK;i++) {
       bitmap[0]=sector_buffer[VTOC_FREE_BITMAPS+(i*4)];
       bitmap[1]=sector_buffer[VTOC_FREE_BITMAPS+(i*4)+1];
       
       sectors_free+=ones_lookup[bitmap[0]&0xf];
       sectors_free+=ones_lookup[(bitmap[0]>>4)&0xf];
       sectors_free+=ones_lookup[bitmap[1]&0xf];
       sectors_free+=ones_lookup[(bitmap[1]>>4)&0xf];

    }
    
    return sectors_free*BYTES_PER_SECTOR;
}


    /* Get a T/S value from a Catalog Sector */
static int dos33_get_catalog_ts(int fd) {
    dos33_read_vtoc(fd);
    
    return TS_TO_INT(sector_buffer[VTOC_CATALOG_T],
		     sector_buffer[VTOC_CATALOG_S]);
}

   /* returns the next valid catalog entry */
   /* after the one passed in */
static int dos33_find_next_file(int fd,int catalog_tsf) {

   
    int catalog_track,catalog_sector,catalog_file;
    int file_track,i;
    int result;

    catalog_file=catalog_tsf>>16;
    catalog_track=(catalog_tsf>>8)&0xff;
    catalog_sector=(catalog_tsf&0xff);

catalog_loop:
   
       /* Read in Catalog Sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);
   
    i=catalog_file;
    while(i<7) {
       
       file_track=sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)];
          /* 0xff means file deleted */
          /* 0x0 means empty */
       if ((file_track!=0xff) && (file_track!=0x0)){ 
	  return ((i<<16)+(catalog_track<<8)+catalog_sector);
       }
       i++;
    }
    catalog_track=sector_buffer[CATALOG_NEXT_T];
    catalog_sector=sector_buffer[CATALOG_NEXT_S];
    if (catalog_sector!=0) {
       catalog_file=0;
       goto catalog_loop;
    }

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
    return -1;
}

static int dos33_print_file_info(int fd,int catalog_tsf) {

    int catalog_track,catalog_sector,catalog_file,i;
    char temp_string[BUFSIZ];
    int result;

    catalog_file=catalog_tsf>>16;
    catalog_track=(catalog_tsf>>8)&0xff;
    catalog_sector=(catalog_tsf&0xff);

       /* Read in Catalog Sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);

    if (sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE)+FILE_TYPE]>0x7f) {
       printf("*");
    }
    else printf(" ");
   
    printf("%c",dos33_file_type(sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE)+FILE_TYPE]));
    printf(" ");
    printf("%.3i ",sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE+FILE_SIZE_L)]+
	          (sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE+FILE_SIZE_H)]<<8));
     

    strncpy(temp_string,
	    dos33_filename_to_ascii(temp_string,sector_buffer+(CATALOG_FILE_LIST+
			            (catalog_file*CATALOG_ENTRY_SIZE+FILE_NAME)),30),
	    BUFSIZ);

    for(i=0;i<strlen(temp_string);i++) {
       if (temp_string[i]<0x20) printf("^%c",temp_string[i]+0x40);
       else printf("%c",temp_string[i]);
    }
      
    printf("\n");

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
    return 0;
}


    /* Checks if "filename" exists */
    /* returns entry/track/sector  */
static int dos33_check_file_exists(int fd,
				   char *filename,
				   int file_deleted) {
    
    int catalog_track,catalog_sector;
    int i,file_track;
    char file_name[31];
    int result;
 
       /* read the VTOC into buffer */
    dos33_read_vtoc(fd);
   
       /* get the catalog track and sector from the VTOC */
    catalog_track=sector_buffer[VTOC_CATALOG_T];
    catalog_sector=sector_buffer[VTOC_CATALOG_S];
    
repeat_catalog:
   
       /* Read in Catalog Sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);
      
       /* scan all file entries in catalog sector */
    for(i=0;i<7;i++) {
       file_track=sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)];
          /* 0xff means file deleted */
          /* 0x0 means empty */
       if (file_track!=0x0) { 
	  
	  if (file_track==0xff) {
	     	  dos33_filename_to_ascii(file_name,
		sector_buffer+(CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE+FILE_NAME)),29);
	     
	     if (file_deleted) {
		/* return if we found the file */
	        if (!strncmp(filename,file_name,29)) {
	 	   return ((i<<16)+(catalog_track<<8)+catalog_sector);
		}
	     }
	  }
	  else {
	      dos33_filename_to_ascii(file_name,
		sector_buffer+(CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE+FILE_NAME)),30);
	     /* return if we found the file */
	     if (!strncmp(filename,file_name,30)) {	     	
	        return ((i<<16)+(catalog_track<<8)+catalog_sector);
	     }
	  }
       }
    }
       /* point to next catalog track/sector */
    catalog_track=sector_buffer[CATALOG_NEXT_T];
    catalog_sector=sector_buffer[CATALOG_NEXT_S];
   
    if (catalog_sector!=0) goto repeat_catalog;

    if (result<0) fprintf(stderr,"Error on I/O\n");
    
    return -1;
}

   /* could be replaced by "find leading 1" instruction */
   /* if available                                      */
int find_first_one(unsigned char byte) {
 
   int i=0;
   
   if (byte==0) return -1;
   
   while((byte& (0x1<<i))==0) {
       i++;
   }
   
   return i;
   
}


static int dos33_free_sector(int fd,int track,int sector) {
 
      
    unsigned char vtoc[BYTES_PER_SECTOR];
    int result;

       /* Seek to VTOC */
    lseek(fd,DISK_OFFSET(VTOC_TRACK,VTOC_SECTOR),SEEK_SET);
       /* read in VTOC */
    result=read(fd,&vtoc,BYTES_PER_SECTOR); 
   
       /* each bitmap is 32 bits.  With 16-sector tracks only first 16 used */
       /* 1 indicates free, 0 indicates used */
    if (sector<8) {
       vtoc[VTOC_FREE_BITMAPS+(track*4)+1]|=(0x1<<sector);
    }
    else {
       vtoc[VTOC_FREE_BITMAPS+(track*4)]|=(0x1<<(sector-8));
    }
   
       /* write modified VTOC back out */
    lseek(fd,DISK_OFFSET(VTOC_TRACK,VTOC_SECTOR),SEEK_SET);
    result=write(fd,&vtoc,BYTES_PER_SECTOR);

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
    return 0;
   
}

static int dos33_allocate_sector(int fd) {
 
    int found_track=0,found_sector=0;
    unsigned char bitmap[4];
    int i,start_track,track_dir,byte;
    int result;
      
    dos33_read_vtoc(fd);
    
       /* Originally used to keep things near center of disk for speed */
       /* We can use to avoid fragmentation possibly */
    start_track=sector_buffer[VTOC_LAST_ALLOC_T]%TRACKS_PER_DISK;
    track_dir=sector_buffer[VTOC_ALLOC_DIRECT];
  
    if (track_dir==255) track_dir=-1;
   
    if ((track_dir!=1) && (track_dir!=-1)) {
       fprintf(stderr,"ERROR!  Invalid track dir %i\n",track_dir);
    }
   
    if (((start_track>VTOC_TRACK) && (track_dir!=1)) ||
        ((start_track<VTOC_TRACK) && (track_dir!=-1))) {
       fprintf(stderr,"Warning! Non-optimal values for track dir t=%i d=%i!\n",
	      start_track,track_dir);
    }
  
   
    i=start_track;

    do {
       
       for(byte=1;byte>-1;byte--) {
	  
          bitmap[byte]=sector_buffer[VTOC_FREE_BITMAPS+(i*4)+byte];
          if (bitmap[byte]!=0x00) {
	     found_sector=find_first_one(bitmap[byte]);
	     found_track=i;
	        /* clear bit indicating in use */
	     sector_buffer[VTOC_FREE_BITMAPS+(i*4)+byte]&=~(0x1<<found_sector);
	     found_sector+=(8*(1-byte));
	     goto found_one;
	  }
       } 
              
          /* Move to next track, handling overflows */
       i+=track_dir;
       if (i<0) {
	  i=VTOC_TRACK;
	  track_dir=1;
       }
       
       if (i>=TRACKS_PER_DISK) {
	  i=VTOC_TRACK;
	  track_dir=-1;
       }
       
    } while (i!=start_track);
   
    fprintf(stderr,"No room left!\n");
    return -1;
   
found_one:
       /* store new track/direction info */ 
    sector_buffer[VTOC_LAST_ALLOC_T]=found_track;
   
    if (found_track>VTOC_TRACK) sector_buffer[VTOC_ALLOC_DIRECT]=1;
    else sector_buffer[VTOC_ALLOC_DIRECT]=-1;
   
       /* Seek to VTOC */
    lseek(fd,DISK_OFFSET(VTOC_TRACK,VTOC_SECTOR),SEEK_SET);
       /* Write out VTOC */
    result=write(fd,&sector_buffer,BYTES_PER_SECTOR);

    if (result<0) fprintf(stderr,"Error on I/O\n");

    return ((found_track<<8)+found_sector);
}

   /* creates file apple_filename on the image from local file filename */
   /* returns ?? */
static int dos33_add_file(int fd,char type,char *filename,
			  char *apple_filename) {
   
    int free_space,file_size,needed_sectors;
    struct stat file_info;
    int size_in_sectors=0;
    int initial_ts_list=0,ts_list=0,i,data_ts,x,bytes_read=0,old_ts_list;
    int catalog_track,catalog_sector,sectors_used=0;
    int input_fd;
    int result;

    if (apple_filename[0]<64) {
       fprintf(stderr,"Error!  First char of filename must be ASCII 64 or above!\n");
       exit(3);
    }
    {
       int i;
       
       for(i=0;i<strlen(apple_filename);i++) {
	  if (apple_filename[i]==',') {
	     fprintf(stderr,"Error!  Cannot have , in a filename!\n");
	     exit(3);
	  }
       }
    }
   
   /* FIXME */
   /* check type */
   /* and sanity check a/b filesize is set properly */
   
   
       /* Determine size of file to upload */
    if (stat(filename,&file_info)<0) {
       fprintf(stderr,"Error!  %s not found!\n",filename);
       exit(3);
    }
    file_size=(int)file_info.st_size;
   
       /* We need to round up to nearest sector size */
       /* Add an extra sector for the T/S list */
       /* Then add extra sector for a T/S list every 122*256 bytes (~31k) */   
    needed_sectors=(file_size/BYTES_PER_SECTOR)+ /* round sectors */
                   ((file_size%BYTES_PER_SECTOR)!=0)+/* tail if needed */
                   1+/* first T/S list */
                   (file_size/(122*BYTES_PER_SECTOR)); /* extra t/s lists */
   
       /* Get free space on device */
    free_space=dos33_free_space(fd);

       /* Check for free space */
    if (needed_sectors*BYTES_PER_SECTOR>free_space) {
       fprintf(stderr,"Error!  Not enough free space on disk image (need %d have %d)\n",
	      needed_sectors*BYTES_PER_SECTOR,free_space);
       exit(4);
    }

       /* plus one because we need a sector for the tail */
    size_in_sectors=(file_size/BYTES_PER_SECTOR)+
     ((file_size%BYTES_PER_SECTOR)!=0);
//    printf("Need to allocate %i data sectors\n",size_in_sectors);
//    printf("Need to allocate %i total sectors\n",needed_sectors);
   
        /* Open the local file */
    input_fd=open(filename,O_RDONLY);
    if (input_fd<0) {
       fprintf(stderr,"Error! could not open %s\n",filename);
       return -1;
    }

    i=0;
    while (i<size_in_sectors) {
       
          /* Create new T/S list if necessary */
       if (i%TSL_MAX_NUMBER==0) {	  
	  old_ts_list=ts_list;

	     /* allocate a sector for the new list */
	  ts_list=dos33_allocate_sector(fd);
	  sectors_used++;
          if (ts_list<0) return -1;
	  
	     /* clear the t/s sector */
	  for(x=0;x<BYTES_PER_SECTOR;x++) sector_buffer[x]=0;
	  lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
	  result=write(fd,sector_buffer,BYTES_PER_SECTOR);
	  
	  if (i==0) initial_ts_list=ts_list;
	  else {
	        /* we aren't the first t/s list so do special stuff */

	        /* load in the old t/s list */
             lseek(fd,
                   DISK_OFFSET(get_high_byte(old_ts_list),
                               get_low_byte(old_ts_list)),
                   SEEK_SET);

             result=read(fd,&sector_buffer,BYTES_PER_SECTOR);
	     
	        /* point from old ts list to new one we just made */
	     sector_buffer[TSL_NEXT_TRACK]=get_high_byte(ts_list);
	     sector_buffer[TSL_NEXT_SECTOR]=get_low_byte(ts_list);
	     
	        /* set offset into file */
	     sector_buffer[TSL_OFFSET_H]=get_high_byte((i-122)*256);
	     sector_buffer[TSL_OFFSET_L]=get_low_byte((i-122)*256);
	        
	        /* write out the old t/s list with updated info */
	     lseek(fd,
                   DISK_OFFSET(get_high_byte(old_ts_list),
                               get_low_byte(old_ts_list)),
                   SEEK_SET);

	     result=write(fd,sector_buffer,BYTES_PER_SECTOR);
	  }
       }       
       
       
          /* allocate a sector */
       data_ts=dos33_allocate_sector(fd);
       sectors_used++;
       
       if (data_ts<0) return -1;
       
          /* clear sector */
       for(x=0;x<BYTES_PER_SECTOR;x++) sector_buffer[x]=0;

          /* read from input */
       bytes_read=read(input_fd,sector_buffer,BYTES_PER_SECTOR);
       if (bytes_read<0) fprintf(stderr,"Error reading bytes!\n");

          /* write to disk image */
       lseek(fd,DISK_OFFSET((data_ts>>8)&0xff,data_ts&0xff),SEEK_SET);
       result=write(fd,sector_buffer,BYTES_PER_SECTOR);
//       printf("Writing %i bytes to %i/%i\n",bytes_read,(data_ts>>8)&0xff,
//	       data_ts&0xff);
       

       
          /* add to T/s table */
       
          /* read in t/s list */
       lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
       result=read(fd,sector_buffer,BYTES_PER_SECTOR);
       
          /* point to new data sector */
       sector_buffer[((i%TSL_MAX_NUMBER)*2)+TSL_LIST]=(data_ts>>8)&0xff;
       sector_buffer[((i%TSL_MAX_NUMBER)*2)+TSL_LIST+1]=(data_ts&0xff);
       
          /* write t/s list back out */
       lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
       result=write(fd,sector_buffer,BYTES_PER_SECTOR);	  
       
       i++;   
    }
   
    /* Add new file to Catalog */
   
       /* read in vtoc */
    dos33_read_vtoc(fd);
   
    catalog_track=sector_buffer[VTOC_CATALOG_T];
    catalog_sector=sector_buffer[VTOC_CATALOG_S];    

continue_parsing_catalog:
   
          /* Read in Catalog Sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);
   
       /* Find empty directory entry */
   i=0;
   while(i<7) {
      if ((sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)]==0xff) ||
	  (sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)]==0x00)) 
	 goto got_a_dentry;
      i++;
   }
   
   if ((catalog_track=0x11) && (catalog_sector==1)) {
      /* in theory can only have 105 files */
      /* if full, we have no recourse!     */
      /* can we allocate new catalog sectors and point to them?? */
      fprintf(stderr,"Error!  No more room for files!\n");
      return -1;
   }

   catalog_track=sector_buffer[CATALOG_NEXT_T];
   catalog_sector=sector_buffer[CATALOG_NEXT_S];

   goto continue_parsing_catalog;
   
got_a_dentry:      
//     printf("Adding file at entry %i of catalog 0x%x:0x%x\n",
//	    i,catalog_track,catalog_sector);
   
       /* Point entry to initial t/s list */
    sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)]=(initial_ts_list>>8)&0xff;
    sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)+1]=(initial_ts_list&0xff);
       /* set file type */
    sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)+FILE_TYPE]=
        dos33_char_to_type(type,0);

//     printf("Pointing T/S to %x/%x\n",(initial_ts_list>>8)&0xff,initial_ts_list&0xff);

       /* copy over filename */
    for(x=0;x<strlen(apple_filename);x++) {
       sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)+FILE_NAME+x]=
             apple_filename[x]^0x80;
    }
   
       /* pad out the filename with spaces */
    for(x=strlen(apple_filename);x<FILE_NAME_SIZE;x++) {
        sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)+FILE_NAME+x]=' '^0x80;
    }
   
       /* fill in filesize in sectors */
    sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)+FILE_SIZE_L]=
        sectors_used&0xff;
    sector_buffer[CATALOG_FILE_LIST+(i*CATALOG_ENTRY_SIZE)+FILE_SIZE_H]=
        (sectors_used>>8)&0xff;
   
       /* write out catalog sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=write(fd,sector_buffer,BYTES_PER_SECTOR);   

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
    return 0;
}

    /* load a file.  fts=entry/track/sector */
static int dos33_load_file(int fd,int fts,char *filename) {
 
    int output_fd;
    int catalog_file,catalog_track,catalog_sector;
    int file_type,file_size=-1,tsl_track,tsl_sector,data_t,data_s;
    unsigned char data_sector[BYTES_PER_SECTOR];
    int tsl_pointer=0,output_pointer=0;
    int result;
   
    /* Fix me!  Warn if overwriting file! */
    output_fd=open(filename,O_WRONLY|O_CREAT|O_TRUNC,0666);
    if (output_fd<0) {
       fprintf(stderr,"Error! could not open %s for local save\n",filename);
       return -1;
    }

    catalog_file=fts>>16;
    catalog_track=(fts>>8)&0xff;
    catalog_sector=(fts&0xff);


       /* Read in Catalog Sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);
   
    tsl_track=sector_buffer[CATALOG_FILE_LIST+
			    (catalog_file*CATALOG_ENTRY_SIZE)+FILE_TS_LIST_T];
    tsl_sector=sector_buffer[CATALOG_FILE_LIST+
			     (catalog_file*CATALOG_ENTRY_SIZE)+FILE_TS_LIST_S];
    file_type=dos33_file_type(sector_buffer[CATALOG_FILE_LIST+
					    (catalog_file*CATALOG_ENTRY_SIZE)
                                            +FILE_TYPE]);
   
//    printf("file_type: %c\n",file_type);

keep_saving:
       /* Read in TSL Sector */
    lseek(fd,DISK_OFFSET(tsl_track,tsl_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);
    tsl_pointer=0;
   
       /* check each track/sector pair in the list */       
    while(tsl_pointer<TSL_MAX_NUMBER) {
    
       /* get the t/s value */
       data_t=sector_buffer[TSL_LIST+(tsl_pointer*TSL_ENTRY_SIZE)];
       data_s=sector_buffer[TSL_LIST+(tsl_pointer*TSL_ENTRY_SIZE)+1];
       
       if ((data_s==0) && (data_t==0)) {
	  /* empty */
       }
       else {
          lseek(fd,DISK_OFFSET(data_t,data_s),SEEK_SET);
          result=read(fd,&data_sector,BYTES_PER_SECTOR);

	     /* some file formats have the size in the first sector */
	     /* so cheat and get real file size from file itself    */
	  if (output_pointer==0) {
	     switch(file_type) {  
	        case 'A':
	        case 'I':
	           file_size=data_sector[0]+(data_sector[1]<<8)+2;
		   break;
	        case 'B':
		   file_size=data_sector[2]+(data_sector[3]<<8)+4;
		   break;
	        default:
	           file_size=-1;
	     }
	  }

	  /* write the block read in out to the output file */
          lseek(output_fd,output_pointer*BYTES_PER_SECTOR,SEEK_SET);
          result=write(output_fd,&data_sector,BYTES_PER_SECTOR);
       }
       output_pointer++;
       tsl_pointer++;
    }
   
      /* finished with TSL sector, see if we have another */
    tsl_track=sector_buffer[TSL_NEXT_TRACK];
    tsl_sector=sector_buffer[TSL_NEXT_SECTOR];

//    printf("Next track/sector=%d/%d op=%d\n",tsl_track,tsl_sector,
//	   output_pointer*BYTES_PER_SECTOR);
   
    if ((tsl_track==0) && (tsl_sector==0)) {
    }
    else goto keep_saving;
   
       /* Correct the file size */
    if (file_size>=0) {    
//       printf("Truncating file size to %d\n",file_size);
       result=ftruncate(output_fd,file_size);
    }

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
    return 0;
   
}

    /* lock a file.  fts=entry/track/sector */
static int dos33_lock_file(int fd,int fts,int lock) {
 
    int catalog_file,catalog_track,catalog_sector;
    int file_type,result;
   
    catalog_file=fts>>16;
    catalog_track=(fts>>8)&0xff;
    catalog_sector=(fts&0xff);


       /* Read in Catalog Sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);

    file_type=sector_buffer[CATALOG_FILE_LIST+
			    (catalog_file*CATALOG_ENTRY_SIZE)
                                            +FILE_TYPE];
   
    if (lock) file_type|=0x80;
    else file_type&=0x7f;
   
    sector_buffer[CATALOG_FILE_LIST+
		  (catalog_file*CATALOG_ENTRY_SIZE)
                                            +FILE_TYPE]=file_type;

      /* write back modified catalog sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=write(fd,sector_buffer,BYTES_PER_SECTOR);

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
    return 0;
   
}

    /* rename a file.  fts=entry/track/sector */
    /* FIXME: can we rename a locked file?    */
    /* FIXME: validate the new filename is valid */
static int dos33_rename_file(int fd,int fts,char *new_name) {
 
    int catalog_file,catalog_track,catalog_sector;
    int x,result;
   
    catalog_file=fts>>16;
    catalog_track=(fts>>8)&0xff;
    catalog_sector=(fts&0xff);

       /* Read in Catalog Sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);

          /* copy over filename */
    for(x=0;x<strlen(new_name);x++) 
       sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE)+
		     FILE_NAME+x]=new_name[x]^0x80;
   
       /* pad out the filename with spaces */
    for(x=strlen(new_name);x<FILE_NAME_SIZE;x++)
        sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE)+
		      FILE_NAME+x]=' '^0x80;
      
      /* write back modified catalog sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=write(fd,sector_buffer,BYTES_PER_SECTOR);

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
    return 0;
   
}

    /* undelete a file.  fts=entry/track/sector */
    /* FIXME: can we rename a locked file?    */
    /* FIXME: validate the new filename is valid */
static int dos33_undelete_file(int fd,int fts,char *new_name) {
 
    int catalog_file,catalog_track,catalog_sector;
    char replacement_char;
    int result;

    catalog_file=fts>>16;
    catalog_track=(fts>>8)&0xff;
    catalog_sector=(fts&0xff);

       /* Read in Catalog Sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);

       /* get the stored track value, and put it back  */
       /* FIXME: should walk file to see if T/s valild */
       /* by setting the track value to FF which indicates deleted file */
    sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE)]=
        sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE)+
		      FILE_NAME+29];

       /* restore file name if possible */

    replacement_char=0xa0;
    if (strlen(new_name)>29) replacement_char=new_name[29]^0x80;
   
    sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE)+
		      FILE_NAME+29]=replacement_char;
      
      /* write back modified catalog sector */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=write(fd,sector_buffer,BYTES_PER_SECTOR);

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
    return 0;
   
}


static int dos33_delete_file(int fd,int fsl) {
   
    int i;
    int catalog_track,catalog_sector,catalog_entry;
    int ts_track,ts_sector;
    char file_type;
    int result;

       /* unpack file/track/sector info */
    catalog_entry=fsl>>16;
    catalog_track=(fsl>>8)&0xff;
    catalog_sector=(fsl&0xff);

       /* Load in the catalog table for the file */
    lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);

    file_type=sector_buffer[CATALOG_FILE_LIST+
			    (catalog_entry*CATALOG_ENTRY_SIZE)
                                            +FILE_TYPE];
    if (file_type&0x80) {
       fprintf(stderr,"File is locked!  Unlock before deleting!\n");
       exit(1);
    }
   
   
       /* get pointer to t/s list */
    ts_track=sector_buffer[CATALOG_FILE_LIST+catalog_entry*CATALOG_ENTRY_SIZE+
		    FILE_TS_LIST_T];
    ts_sector=sector_buffer[CATALOG_FILE_LIST+catalog_entry*CATALOG_ENTRY_SIZE+
		     FILE_TS_LIST_S];
   
keep_deleting:
   

   
       /* load in the t/s list info */
    lseek(fd,DISK_OFFSET(ts_track,ts_sector),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);
      
      /* Free each sector listed by t/s list */
    for(i=0;i<TSL_MAX_NUMBER;i++) {
          /* If t/s = 0/0 then no need to clear */
       if ((sector_buffer[TSL_LIST+2*i]==0) && (sector_buffer[TSL_LIST+2*i+1]==0)) {
       }
       else {
          dos33_free_sector(fd,sector_buffer[TSL_LIST+2*i],sector_buffer[TSL_LIST+2*i+1]);
       }
    }

          /* free the t/s list */
    dos33_free_sector(fd,ts_track,ts_sector);
   
       /* Point to next t/s list */
    ts_track=sector_buffer[TSL_NEXT_TRACK];
    ts_sector=sector_buffer[TSL_NEXT_SECTOR];
   
       /* If more tsl lists, keep looping */
    if ((ts_track==0x0) && (ts_sector==0x0)) {
    }
    else {
       goto keep_deleting;        
    }
   
       /* Erase file from catalog entry */
   
       /* First reload proper catalog sector */
   lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
   result=read(fd,sector_buffer,BYTES_PER_SECTOR);
      
      /* save track as last char of name, for undelete purposes */
   sector_buffer[CATALOG_FILE_LIST+(catalog_entry*CATALOG_ENTRY_SIZE)+
	  (FILE_NAME+FILE_NAME_SIZE-1)]=
     sector_buffer[CATALOG_FILE_LIST+(catalog_entry*CATALOG_ENTRY_SIZE)];
   
       /* Actually delete the file */
       /* by setting the track value to FF which indicates deleted file */
   sector_buffer[CATALOG_FILE_LIST+(catalog_entry*CATALOG_ENTRY_SIZE)]=0xff;
   
       /* re seek to catalog position and write out changes */
   lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
   result=write(fd,sector_buffer,BYTES_PER_SECTOR);

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
   return 0;
}

static int dump_sector(void) {
    int i,j;
   
    for(i=0;i<16;i++) {
       printf("$%02X : ",i*16);
       for(j=0;j<16;j++) 
	  printf("%02X ",sector_buffer[i*16+j]);
       printf("\n");
    }
    return 0;
}

   


static int dos33_dump(int fd) {
   
    int num_tracks,catalog_t,catalog_s,file,ts_t,ts_s,ts_total,track,sector;
    int i,j;
    int deleted=0;
    char temp_string[BUFSIZ];
    unsigned char tslist[BYTES_PER_SECTOR];
    int result;
   
    /* Read Track 1 Sector 9 */
    lseek(fd,DISK_OFFSET(1,9),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);

    printf("Finding name of startup file, Track 1 Sector 9 offset $75\n");
    dump_sector();
    printf("Startup Filename: ");
    for(i=0;i<30;i++) printf("%c",sector_buffer[0x75+i]&0x7f);						
    printf("\n");
   
    dos33_read_vtoc(fd);
    
    printf("\nVTOC Sector:\n");
    dump_sector();
   
    printf("\n\n");
    printf("VTOC INFORMATION:\n");
    catalog_t=sector_buffer[VTOC_CATALOG_T];
    catalog_s=sector_buffer[VTOC_CATALOG_S];
    printf("\tFirst Catalog = %02X/%02X\n",catalog_t,catalog_s);
    printf("\tDOS RELEASE = 3.%i\n",sector_buffer[VTOC_DOS_RELEASE]);
    printf("\tDISK VOLUME = %i\n",sector_buffer[VTOC_DISK_VOLUME]);
    ts_total=sector_buffer[VTOC_MAX_TS_PAIRS];
    printf("\tT/S pairs that will fit in T/S List = %i\n",ts_total);
	                          
    printf("\tLast track where sectors were allocated = $%02X\n",
	                          sector_buffer[VTOC_LAST_ALLOC_T]);
    printf("\tDirection of track allocation = %i\n",
	                          sector_buffer[VTOC_ALLOC_DIRECT]);
   
    num_tracks=sector_buffer[VTOC_NUM_TRACKS];
    printf("\tNumber of tracks per disk = %i\n",num_tracks);
    printf("\tNumber of sectors per track = %i\n",
	                          sector_buffer[VTOC_S_PER_TRACK]);
    printf("\tNumber of bytes per sector = %i\n",
	        (sector_buffer[VTOC_BYTES_PER_SH]<<8)+sector_buffer[VTOC_BYTES_PER_SL]);
    
    printf("\nFree sector bitmap:\n");
    printf("\tTrack  FEDCBA98 76543210\n");
    for(i=0;i<num_tracks;i++) {
       printf("\t $%02X:  ",i);
       for(j=0;j<8;j++) { 
	  if ((sector_buffer[VTOC_FREE_BITMAPS+(i*4)]<<j)&0x80) printf("."); 
          else printf("U");
       }
       printf(" ");
       for(j=0;j<8;j++) { 
	  if ((sector_buffer[VTOC_FREE_BITMAPS+(i*4)+1]<<j)&0x80) printf("."); 
          else printf("U");
       }
       
       printf("\n");
    }

repeat_catalog:
   
    printf("\nCatalog Sector $%02X/$%02x\n",catalog_t,catalog_s);
    lseek(fd,DISK_OFFSET(catalog_t,catalog_s),SEEK_SET);
    result=read(fd,sector_buffer,BYTES_PER_SECTOR);

    dump_sector();
   
    for(file=0;file<7;file++) {
       printf("\n\n");	

       ts_t=sector_buffer[(CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_TS_LIST_T))];
       ts_s=sector_buffer[(CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_TS_LIST_S))];

       printf("%i+$%02X/$%02X - ",file,catalog_t,catalog_s);
       deleted=0;
       
       if (ts_t==0xff) {
          printf("**DELETED** ");
          deleted=1;
	  ts_t=sector_buffer[(CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_NAME+0x1e))];
       }
   
       if (ts_t==0x00) {
          printf("UNUSED!\n");
          goto continue_dump;
       }
   
       strncpy(temp_string,dos33_filename_to_ascii(temp_string,
		sector_buffer+(CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_NAME)),30),
	       BUFSIZ);

       for(i=0;i<strlen(temp_string);i++) {
          if (temp_string[i]<0x20) printf("^%c",temp_string[i]+0x40);
          else printf("%c",temp_string[i]);
       }
       printf("\n");
       printf("\tLocked = %s\n",
	    sector_buffer[CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE)+FILE_TYPE]>0x7f?
	   "YES":"NO");
       printf("\tType = %c\n", 
           dos33_file_type(sector_buffer[CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE)+FILE_TYPE]));
       printf("\tSize in sectors = %i\n",
                   sector_buffer[CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_SIZE_L)]+
	          (sector_buffer[CATALOG_FILE_LIST+(file*CATALOG_ENTRY_SIZE+FILE_SIZE_H)]<<8));
repeat_tsl:
       printf("\tT/S List $%02X/$%02X:\n",ts_t,ts_s);
       if (deleted) goto continue_dump;
       lseek(fd,DISK_OFFSET(ts_t,ts_s),SEEK_SET);
       result=read(fd,&tslist,BYTES_PER_SECTOR);

       for(i=0;i<ts_total;i++) {
          track=tslist[TSL_LIST+(i*TSL_ENTRY_SIZE)];
          sector=tslist[TSL_LIST+(i*TSL_ENTRY_SIZE)+1];
          if ((track==0) && (sector==0)) printf(".");
          else printf("\n\t\t%02X/%02X",track,sector);
       }
       ts_t=tslist[TSL_NEXT_TRACK];
       ts_s=tslist[TSL_NEXT_SECTOR];
   
       if (!((ts_s==0) && (ts_t==0))) goto repeat_tsl;
continue_dump:;
    }
    
    catalog_t=sector_buffer[CATALOG_NEXT_T];
    catalog_s=sector_buffer[CATALOG_NEXT_S];
   
    if (catalog_s!=0) {
       file=0;
       goto repeat_catalog;
    }
      
    printf("\n");

    if (result<0) fprintf(stderr,"Error on I/O\n");
   
    return 0;
}

int dos33_rename_hello(int fd, char *new_name) {
   char buffer[BYTES_PER_SECTOR];
   int i;
   
   lseek(fd,DISK_OFFSET(1,9),SEEK_SET);
   read(fd,buffer,BYTES_PER_SECTOR);
       
   for(i=0;i<30;i++) {
      if (i<strlen(new_name)) {
	 buffer[0x75+i]=new_name[i]|0x80;
      }
      else {
	 buffer[0x75+i]=' '|0x80;
      }
   }
       
   lseek(fd,DISK_OFFSET(1,9),SEEK_SET);
   write(fd,buffer,BYTES_PER_SECTOR);       
   
   return 0;
}

int display_help(char *name) {
    printf("\ndos33 version %s\n",VERSION);
    printf("by Vince Weaver <vince@deater.net>\n");
    printf("\n");
    printf("Usage: %s [-h] [-y] disk_image COMMAND [options]\n",name);
    printf("\t-h : this help message\n");
    printf("\t-y : always answer yes for anying warning questions\n");
    printf("\n");
    printf("  Where disk_image is a valid dos3.3 disk image\n"
	   "  and COMMAND is one of the following:\n");
    printf("\tCATALOG\n");
    printf("\tLOAD     apple_file <local_file>\n");
    printf("\tSAVE     type local_file <apple_file>\n");
    printf("\tDELETE   apple_file\n");   
    printf("\tLOCK     apple_file\n");
    printf("\tUNLOCK   apple_file\n");
    printf("\tRENAME   apple_file_old apple_file_new\n");
    printf("\tUNDELETE apple_file\n");
    printf("\tDUMP\n");
    printf("\tHELLO    apple_file\n");
#if 0
    printf("\tINIT\n");
    printf("\tCOPY\n");
#endif   
    printf("\n");
    return 0;
}

#define COMMAND_UNKNOWN  0
#define COMMAND_LOAD     1
#define COMMAND_SAVE     2
#define COMMAND_CATALOG  3
#define COMMAND_DELETE   4
#define COMMAND_UNDELETE 5
#define COMMAND_LOCK     6
#define COMMAND_UNLOCK   7
#define COMMAND_INIT     8
#define COMMAND_RENAME   9
#define COMMAND_COPY    10
#define COMMAND_DUMP    11
#define COMMAND_HELLO   12

int main(int argc, char **argv) {
   
    char image[BUFSIZ];
    unsigned char type='b';
    int dos_fd=0,i;

    int command,catalog_entry;
    char temp_string[BUFSIZ];
    char apple_filename[31],new_filename[31];
    char output_filename[BUFSIZ];
    char *result_string;
    int always_yes=0,firstarg=1,extra_ops=0;


    /* Check command line arguments */
    /* Ugh I should use getopt() or something similar here */

    if (argc<2) {
       display_help(argv[0]);
       goto exit_program;
    }

    if (!strncmp(argv[1],"-h",2)) {
       display_help(argv[1]);
       goto exit_program;
    }

    if (!strncmp(argv[1],"-y",2)) {
       always_yes=1;
       extra_ops++;
       firstarg++;
    }


    if (argc<3) {
       printf("\nInvalid arguments!\n");
       display_help(argv[0]);
       goto exit_program;
    }

      /* get argument 1, which is image name */
    strncpy(image,argv[firstarg],BUFSIZ);    
    dos_fd=open(image,O_RDWR);
    if (dos_fd<0) {
       fprintf(stderr,"Error opening disk_image: %s\n",image);
       exit(4);
    }

       /* Check argument #2 which is command */
    strncpy(temp_string,argv[firstarg+1],BUFSIZ);
       /* Make command be uppercase */
    for(i=0;i<strlen(temp_string);i++) {
       temp_string[i]=toupper(temp_string[i]);
    }
   
    if (!strncmp(temp_string,"LOAD",4)) {
       command=COMMAND_LOAD;
    }
    else if (!strncmp(temp_string,"SAVE",4)) {
       command=COMMAND_SAVE;
    }
    else if (!strncmp(temp_string,"CATALOG",7)) {
       command=COMMAND_CATALOG;
    }
    else if (!strncmp(temp_string,"DELETE",6)) {
       command=COMMAND_DELETE;
    }
    else if (!strncmp(temp_string,"UNDELETE",8)) {
       command=COMMAND_UNDELETE;
    }
    else if (!strncmp(temp_string,"LOCK",4)) {
       command=COMMAND_LOCK;
    }
    else if (!strncmp(temp_string,"UNLOCK",6)) {
       command=COMMAND_UNLOCK;
    }
    else if (!strncmp(temp_string,"INIT",4)) {
       command=COMMAND_INIT;
    }
    else if (!strncmp(temp_string,"RENAME",6)) {
       command=COMMAND_RENAME;
    }
    else if (!strncmp(temp_string,"COPY",4)) {
       command=COMMAND_COPY;
    }
    else if (!strncmp(temp_string,"DUMP",4)) {
       command=COMMAND_DUMP;
    }	
    else if (!strncmp(temp_string,"HELLO",5)) {
       command=COMMAND_HELLO;
    }	   
    else {
       display_help(argv[0]);
       goto exit_program;
    }


   
    switch(command) {
            /* Load a file from disk image to local machine */
       case COMMAND_LOAD:
               /* check and make sure we have apple_filename */
            if (argc<4+extra_ops) {
	       fprintf(stderr,"Error! Need apple file_name\n");
	       fprintf(stderr,"%s %s LOAD apple_filename\n",argv[0],image);
	       goto exit_and_close;
	    }
               /* Truncate filename if too long */
            if (strlen(argv[firstarg+2])>30) {
	       fprintf(stderr,"Warning!  Truncating %s to 30 chars\n",
		      argv[firstarg+2]);
	    }
            strncpy(apple_filename,argv[firstarg+2],30);
	    apple_filename[30]='\0';
		
               /* get output filename */
            if (argc==5+extra_ops) {
	       strncpy(output_filename,argv[firstarg+3],BUFSIZ);
	    }
            else {
	       strncpy(output_filename,apple_filename,30);
	    }
       
               /* get the entry/track/sector for file */
            catalog_entry=dos33_check_file_exists(dos_fd,
					    apple_filename,
					    FILE_NORMAL);
            if (catalog_entry<0) {
	       fprintf(stderr,"Error!  %s not found!\n",apple_filename);
	       goto exit_and_close;
	    }

            dos33_load_file(dos_fd,catalog_entry,output_filename);
            
            break;
       
       case COMMAND_CATALOG:     
            
            /* get first catalog */
            catalog_entry=dos33_get_catalog_ts(dos_fd);       
       
            printf("\nDISK VOLUME %i\n\n",sector_buffer[VTOC_DISK_VOLUME]);
            while(catalog_entry>0) {
               catalog_entry=dos33_find_next_file(dos_fd,catalog_entry);
               if (catalog_entry>0) {
		  dos33_print_file_info(dos_fd,catalog_entry);
	          catalog_entry+=(1<<16);
		  /* dos33_find_next_file() handles wrapping issues */
	       }
	    }
            printf("\n");
            break;
     
     case COMMAND_SAVE:
       
               /* argv3 == type == A,B,T,I,N,L etc */
               /* argv4 == name of local file */
               /* argv5 == optional name of file on disk image */
       
            if (argc<5+extra_ops) {
	       fprintf(stderr,"Error! Need type and file_name\n");
	       fprintf(stderr,"%s %s SAVE type file_name apple_filename\n",
		      argv[0],image);
	       goto exit_and_close;
	    }
            
            type=argv[firstarg+2][0];
       
            if (argc==6+extra_ops) {
	       if (strlen(argv[firstarg+4])>30) {
		  fprintf(stderr,
                          "Warning!  Truncating filename to 30 chars!\n");
	       }
	       strncpy(apple_filename,argv[firstarg+4],30);
	       apple_filename[30]=0;
	    }
            else {
	          /* If no filename specified for apple name */
	          /* Then use the input name.  Note, we strip */
	          /* everything up to the last slash so useless */
	          /* path info isn't used                       */
		 {
		    char *temp;
		    temp=argv[firstarg+3]+(strlen(argv[firstarg+3])-1);
		
		    while(temp!=argv[firstarg+3]) {
		       temp--;
		       if (*temp == '/') {
			  temp++;
			  break;
		       }
		    }
		 
	            if (strlen(temp)>30) {
		       fprintf(stderr,
			       "Warning!  Truncating filename to 30 chars!\n");
	            }
	       
	            strncpy(apple_filename,temp,30);
	            apple_filename[30]=0;
		 }
	    }
       
            catalog_entry=dos33_check_file_exists(dos_fd,apple_filename,
						  FILE_NORMAL);
       
            if (catalog_entry>=0) {
	       fprintf(stderr,"Warning!  %s exists!\n",apple_filename);
	       if (!always_yes) {
	          printf("Over-write (y/n)?");
	          result_string=fgets(temp_string,BUFSIZ,stdin);
	          if ((result_string==NULL) || (temp_string[0]!='y')) {
		     printf("Exiting early...\n");
		     goto exit_and_close;
	          }
	       }
	       fprintf(stderr,"Deleting previous version...\n");
	       dos33_delete_file(dos_fd,catalog_entry);
	    }

            dos33_add_file(dos_fd,type,argv[firstarg+3],apple_filename);
                   
            break;

     case COMMAND_DELETE:
            if (argc+extra_ops<4) {
	       fprintf(stderr,"Error! Need file_name\n");
	       fprintf(stderr,"%s %s DELETE apple_filename\n",argv[0],image);
	       goto exit_and_close;
	    }
            catalog_entry=dos33_check_file_exists(dos_fd,argv[firstarg+2],
						  FILE_NORMAL);
            if (catalog_entry<0) {
	       fprintf(stderr,
		       "Error!  File %s does not exist\n",argv[firstarg+2]);
	       goto exit_and_close;
	    } 
	    dos33_delete_file(dos_fd,catalog_entry);
	    break;
       
     case COMMAND_DUMP:
          printf("Dumping %s!\n",argv[firstarg]);
          dos33_dump(dos_fd);
          break;
       
     case COMMAND_LOCK:
     case COMMAND_UNLOCK:       
             /* check and make sure we have apple_filename */
          if (argc<4+extra_ops) {
	     fprintf(stderr,"Error! Need apple file_name\n");
	     fprintf(stderr,"%s %s LOCK apple_filename\n",argv[0],image);
	     goto exit_and_close;
	  }
       
             /* Truncate filename if too long */
          if (strlen(argv[firstarg+2])>30) {
	     fprintf(stderr,
		    "Warning!  Truncating %s to 30 chars\n",argv[firstarg+2]);
	  }
          strncpy(apple_filename,argv[firstarg+2],30);
	  apple_filename[30]='\0';
		
             /* get the entry/track/sector for file */
          catalog_entry=dos33_check_file_exists(dos_fd,
					    apple_filename,
					    FILE_NORMAL);
          if (catalog_entry<0) {
	     fprintf(stderr,"Error!  %s not found!\n",apple_filename);
	     goto exit_and_close;
	  }

          dos33_lock_file(dos_fd,catalog_entry,command==COMMAND_LOCK);
            
          break;
       
     case COMMAND_RENAME:
             /* check and make sure we have apple_filename */
          if (argc<5+extra_ops) {
	     fprintf(stderr,"Error! Need two filenames\n");
	     fprintf(stderr,"%s %s LOCK apple_filename_old "
		     "apple_filename_new\n",
		     argv[0],image);
	     goto exit_and_close;
	  }
       
             /* Truncate filename if too long */
          if (strlen(argv[firstarg+2])>30) {
	     fprintf(stderr,
		     "Warning!  Truncating %s to 30 chars\n",argv[firstarg+2]);
	  }
          strncpy(apple_filename,argv[firstarg+2],30);
	  apple_filename[30]='\0';
       
             /* Truncate filename if too long */
          if (strlen(argv[firstarg+3])>30) {
	     fprintf(stderr,
		     "Warning!  Truncating %s to 30 chars\n",argv[firstarg+3]);
	  }
          strncpy(new_filename,argv[firstarg+3],30);
	  new_filename[30]='\0';       
		
             /* get the entry/track/sector for file */
          catalog_entry=dos33_check_file_exists(dos_fd,
					    apple_filename,
					    FILE_NORMAL);
          if (catalog_entry<0) {
	     fprintf(stderr,"Error!  %s not found!\n",apple_filename);
	     goto exit_and_close;
	  }

          dos33_rename_file(dos_fd,catalog_entry,new_filename);
            
          break;

     case COMMAND_UNDELETE:       
             /* check and make sure we have apple_filename */
          if (argc<4) {
	     fprintf(stderr,"Error! Need apple file_name\n");
	     fprintf(stderr,"%s %s LOCK apple_filename\n",argv[0],image);
	     goto exit_and_close;
	  }
       
             /* Truncate filename if too long */
             /* what to do about last char ? */
          if (strlen(argv[firstarg+2])>30) {
	     fprintf(stderr,
		     "Warning!  Truncating %s to 30 chars\n",argv[firstarg+2]);
	  }
          strncpy(apple_filename,argv[firstarg+2],30);
	  apple_filename[30]='\0';
		
             /* get the entry/track/sector for file */
          catalog_entry=dos33_check_file_exists(dos_fd,
					    apple_filename,
					    FILE_DELETED);
          if (catalog_entry<0) {
	     fprintf(stderr,"Error!  %s not found!\n",apple_filename);
	     goto exit_and_close;
	  }

          dos33_undelete_file(dos_fd,catalog_entry,apple_filename);
            
          break;
     case COMMAND_HELLO:
            if (argc+extra_ops<4) {
	       fprintf(stderr,"Error! Need file_name\n");
	       fprintf(stderr,"%s %s HELLO apple_filename\n",argv[0],image);
	       goto exit_and_close;
	    }
            catalog_entry=dos33_check_file_exists(dos_fd,argv[firstarg+2],
						  FILE_NORMAL);
            if (catalog_entry<0) {
	       fprintf(stderr,
		       "Warning!  File %s does not exist\n",argv[firstarg+2]);
	    }
       
            dos33_rename_hello(dos_fd,argv[firstarg+2]);
       
            break;
     case COMMAND_INIT:
          /* use common code from mkdos33fs? */
     case COMMAND_COPY:
          /* use temp file?  Walking a sector at a time seems a pain */
     default:
       fprintf(stderr,"Sorry, unsupported command\n");
       goto exit_and_close;
    }

   
exit_and_close:
    close(dos_fd);
exit_program:
   
    return 0;  
}