048c87bbac
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@305 6ac86273-5f31-0410-b378-82cca8765d1b
97 lines
4.1 KiB
C
97 lines
4.1 KiB
C
/****************************************************************/
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/* */
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/* buffer.h */
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/* */
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/* Sector buffer structure */
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/* */
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/* Copyright (c) 2001 */
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/* Bart Oldeman */
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/* */
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/* Largely taken from globals.h: */
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/* Copyright (c) 1995, 1996 */
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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 *buffer_hRcsId = "$Id$";
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#endif
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#endif
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/*
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* $Log$
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* Revision 1.5 2001/09/23 20:39:44 bartoldeman
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* FAT32 support, misc fixes, INT2F/AH=12 support, drive B: handling
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*
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* Revision 1.4 2001/08/19 12:58:34 bartoldeman
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* Time and date fixes, Ctrl-S/P, findfirst/next, FCBs, buffers, tsr unloading
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*
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* Revision 1.3 2001/07/24 16:56:29 bartoldeman
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* fixes for FCBs, DJGPP ls, DBLBYTE, dyninit allocation (2024e).
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*
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* Revision 1.2 2001/06/03 14:16:17 bartoldeman
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* BUFFERS tuning and misc bug fixes/cleanups (2024c).
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*
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* Revision 1.1 2001/04/21 22:32:53 bartoldeman
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* Init DS=Init CS, fixed stack overflow problems and misc bugs.
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*
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* Rev 1.0 20 Apr 2001 17:30:00 Bart Oldeman
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* Initial revision.
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*/
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#define BUFFERSIZE 512
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struct buffer
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{
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WORD b_dummy; /* dummy self pointing word to keep MFT from crashing */
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struct buffer
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FAR *b_next; /* form linked list for LRU */
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BYTE b_unit; /* disk for this buffer */
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BYTE b_flag; /* buffer flags */
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ULONG b_blkno; /* block for this buffer */
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/* DOS-C: 0xffff for huge block numbers */
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BYTE b_copies; /* number of copies to write */
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#ifdef WITHFAT32
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ULONG b_offset; /* span between copies */
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#else
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UWORD b_offset; /* span between copies */
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#endif
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#if 0 /*TE*/
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union
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{
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struct dpb FAR *_b_dpbp; /* pointer to DPB */
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LONG _b_huge_blkno; /* DOS-C: actual block number if >= 0xffff */
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}
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_b;
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#endif
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BYTE b_buffer[BUFFERSIZE]; /* 512 byte sectors for now */
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};
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#define b_dpbp _b._b_dpbp
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#define b_huge_blkno _b._b_huge_blkno
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#define BFR_UNCACHE 0x80 /* indication, not really used */
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#define BFR_DIRTY 0x40 /* buffer modified */
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#define BFR_VALID 0x20 /* buffer contains valid data */
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#define BFR_DATA 0x08 /* buffer is from data area */
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#define BFR_DIR 0x04 /* buffer is from dir area */
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#define BFR_FAT 0x02 /* buffer is from fat area */
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#define BFR_BOOT 0x01 /* buffer is boot disk */
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