/*  disk.h
 *
 *  Disk System and Diskette Primitive Access Header
 *
 *  The Greenleaf Functions - Copyright (C) 1983 Greenleaf Software
 */

typedef long dword;
#define dosint 0x21		/* DOS function interrupt		*/

/*  Disk File Attribute bits are in the following structure		*/

struct DISKATTR {
	word rdo : 1;		/* bit 0 - Read Only attribute		*/
	word hid : 1;		/* bit 1 - Hidden attribute		*/
	word sys : 1;		/* bit 2 - System attribute		*/
	word vll : 1;		/* bit 3 - Volume Label	in 1st 11 bytes	*/
	word sbd : 1;		/* bit 4 - Sub Directory bit		*/
	word arc : 1;		/* bit 5 is archive bit			*/
	word _spares  :10;	/* bits 6,7, and  first byte . unused	*/
	};

/*  this union allows ease of access to the attribute as a word		*/

union FILEATTR  {
	word fattr;
	struct DISKATTR dattr;
	};

struct EXTFCB {
	byte  extflag;		/* extension flag: 0FF=extd fcb		*/
	byte  sysreserve[4];	/* reserved DOS 2.0 - don't use		*/
    union FILEATTR dskattr;	/* Attribute in second byte, 1st unused */
	byte  fdrive;		/* drive code: 0=default 1=A 2=B..	*/
	byte  fname[8];		/* filename UC left justify blank fill	*/
	byte  fext[3];		/* filename extension			*/
	word  blocknum;		/* current block number, first = 0	*/
	word  lrs;		/* logical record size (bytes): 80h opn	*/
	dword lfs;		/* logical file size bytes: wd 1 = lo	*/

				/* Create or Last Update Date   	*/
	word   fcbyear : 7;	/* year  0..119	(1980..2099)		*/
	word   fcbmonth: 4;	/* month 1..12				*/
	word   fcbday  : 5;	/* day   1..31				*/

	byte   fcbsys[10];	/*  reserved for DOS use		*/
	byte   fcbcr;		/* current record number (seq i/o)	*/
	dword  fcbrec;		/* random record number  (rand i/o)	*/
	};

/*  Structure for FATINFO part of DISKTABLE
 */
struct FATINFO {
	word 	 fatid;		/* see function 1B			*/
	word	 allocunits;	/* allocation units			*/
	word 	 sectsalloc;	/* sectors per allocation unit		*/
	word 	 sectsize;	/* sector size				*/
	};

/*  Structure for LOLEV part of DISKTABLE
 */
struct LOLEV {
	int	head;		/* head 0..1 (0..7 for hard disk)	*/
	int	cylinder;	/* 0..39     (0..1023  hard disk)	*/
	int	track;		/* 0..39 ..synonym for cylinder		*/
	int	fsector;	/* first sector - 1..9 (1..17 hard dsk)	*/
	int	nsectors;	/* no. sectors  - 1..8 (1..128 harddsk) */
	int	sectsdone;	/* sectors actually done (return value) */
	};



/*  structure for lots of DOS disk access functions including members
 *  to handle DOS 2.0 and 1.x functions.  Note that an Extended FCB is
 *  an integral part of this structure.
 *
 *  The "lolev" structure part of this is used only for DOS interrupts
 *  24h and 25h and for ALL "BIOS" or "LOLEV" disk functions "diskxxxx".
 *
 *  The "fatinfo" structure part is used only for "dosfatinfo".
 */
struct DISKTABLE {
	char	 *string;	/* drive:path\filename.ext		*/
	word	 handle;	/* File Handle				*/
	int      drive;		/* drive code: 0=A, etc.		*/

	byte     *bufoffset;	/* pointer to disk buffer (offset)	*/
	word 	 bufseg;	/* segment address of disk buffer	*/
				/*  code as 0 to use current DS		*/

	word	 access;	/* file access method 1..6		*/
	word	 mode;		/* mode ASCII or BINARY			*/

	struct EXTFCB dskfcb;	/* FCB is used for some functions	*/

	int	 rbytes;	/* number of bytes to be read/written	*/
	int	 abytes;	/* ..bytes actually read/written	*/

	struct LOLEV lolev;	/* use for all "diskxxxx" functions only*/

	word	 status;	/* status return from all functions	*/
	char	 *save;		/* output string, as in fn 47h		*/
	word	 dosver;	/* DOS version as read by functions	*/
	};

/*  structure to use when renaming a file
 */

struct RENFILE {
	byte drvcode;		/* drive				*/
	byte oldname[8];	/* DS:DX + 1..8 old filename		*/
	byte oldext[3];		/*       + 9..B old extension		*/
	byte dontuse[5];	/*       + C..10 .. do not use		*/
	byte newname[8];	/*       +11..18 .. new filename 	*/
	byte newext[3];		/*	 +19..1B .. new extension	*/
	byte padddd[8];		/* pad out to regular FCB size		*/
	};

struct FHANDLE {
	unsigned xfhandle;
	char     xfname[13];	/* filename, ext	 		*/
	};