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93 lines
4.6 KiB
C
93 lines
4.6 KiB
C
/****************************************************************/
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/* */
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/* dcb.h */
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/* */
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/* DOS Device Control Block Structure */
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/* */
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/* November 20, 1991 */
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/* */
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/* Copyright (c) 1995 */
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/* Pasquale J. Villani */
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/* All Rights Reserved */
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/* */
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/* This file is part of DOS-C. */
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/* */
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/* DOS-C is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU General Public License */
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/* as published by the Free Software Foundation; either version */
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/* 2, or (at your option) any later version. */
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/* */
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/* DOS-C is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
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/* the GNU General Public License for more details. */
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/* */
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/* You should have received a copy of the GNU General Public */
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/* License along with DOS-C; see the file COPYING. If not, */
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/* write to the Free Software Foundation, 675 Mass Ave, */
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/* Cambridge, MA 02139, USA. */
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/****************************************************************/
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#ifdef MAIN
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#ifdef VERSION_STRINGS
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static BYTE *clock_hRcsId =
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"$Id: dcb.h 485 2002-12-09 00:17:15Z bartoldeman $";
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#endif
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#endif
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/* Internal drive parameter block */
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struct dpb {
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BYTE dpb_unit; /* unit for error reporting */
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BYTE dpb_subunit; /* the sub-unit for driver */
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UWORD dpb_secsize; /* sector size */
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UBYTE dpb_clsmask; /* mask (sectors/cluster-1) */
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UBYTE dpb_shftcnt; /* log base 2 of cluster size */
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UWORD dpb_fatstrt; /* FAT start sector */
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UBYTE dpb_fats; /* # of FAT copies */
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UWORD dpb_dirents; /* # of dir entries */
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UWORD dpb_data; /* start of data area */
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UWORD dpb_size; /* # of clusters+1 on media */
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UWORD dpb_fatsize; /* # of sectors / FAT */
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UWORD dpb_dirstrt; /* start sec. of root dir */
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struct dhdr FAR * /* pointer to device header */
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dpb_device;
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UBYTE dpb_mdb; /* media descr. byte */
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BYTE dpb_flags; /* -1 = force MEDIA CHK */
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struct dpb FAR * /* next dpb in chain */
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dpb_next; /* -1 = end */
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UWORD dpb_cluster; /* cluster # of first free */
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/* -1 if not known */
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#ifndef WITHFAT32
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UWORD dpb_nfreeclst; /* number of free clusters */
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/* -1 if not known */
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#else
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union {
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struct {
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UWORD dpb_nfreeclst_lo;
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UWORD dpb_nfreeclst_hi;
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} dpb_nfreeclst_st;
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ULONG _dpb_xnfreeclst; /* number of free clusters */
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/* -1 if not known */
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} dpb_nfreeclst_un;
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#define dpb_nfreeclst dpb_nfreeclst_un.dpb_nfreeclst_st.dpb_nfreeclst_lo
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#define dpb_xnfreeclst dpb_nfreeclst_un._dpb_xnfreeclst
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UWORD dpb_xflags; /* extended flags, see bpb */
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UWORD dpb_xfsinfosec; /* FS info sector number, */
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/* 0xFFFF if unknown */
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UWORD dpb_xbackupsec; /* backup boot sector number */
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/* 0xFFFF if unknown */
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ULONG dpb_xdata;
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ULONG dpb_xsize; /* # of clusters+1 on media */
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ULONG dpb_xfatsize; /* # of sectors / FAT */
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ULONG dpb_xrootclst; /* starting cluster of root dir */
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ULONG dpb_xcluster; /* cluster # of first free */
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/* -1 if not known */
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#endif
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};
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#define UNKNCLUSTER 0x0000 /* see RBIL INT 21/AH=52 entry */
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#define XUNKNCLSTFREE 0xffffffffl /* unknown for DOS */
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#define UNKNCLSTFREE 0xffff /* unknown for DOS */
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