mirror of https://github.com/dzavalishin/oskit/
106 lines
3.8 KiB
C
Executable File
106 lines
3.8 KiB
C
Executable File
/*
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* Copyright (c) 1996, 1998 University of Utah and the Flux Group.
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* All rights reserved.
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*
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* This file is part of the Flux OSKit. The OSKit is free software, also known
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* as "open source;" you can redistribute it and/or modify it under the terms
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* of the GNU General Public License (GPL), version 2, as published by the Free
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* Software Foundation (FSF). To explore alternate licensing terms, contact
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* the University of Utah at csl-dist@cs.utah.edu or +1-801-585-3271.
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*
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* The OSKit is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GPL for more details. You should have
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* received a copy of the GPL along with the OSKit; see the file COPYING. If
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* not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
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*/
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/*
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* This file contains the code to convert a FreeBSD style slice and
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* partition number into an index into the partition table.
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*
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* This allows a disklable to be inside a DOS partition.
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <oskit/diskpart/diskpart.h>
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/*
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* This will be called by every routine that needs to access partition
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* info based on a device number.
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*/
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/*
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* It may be better to cache the results of the call to the lookup
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* function. The address returned cound then be used as the `handle',
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* which would enable much faster accesses to the data. These could
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* be compared to see if the same partition is opened more than once.
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* However, multiple aliases in the partitioning information will not
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* be detected this easily -- the bounds will still have to be checked
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* by the user.
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*/
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/*
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* Slice 0 is either the whole disk (when partition is also 0), or is
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* aliased (compatability slice), while Slice 1+ represent actual
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* top-level (typically DOS) partitions.
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*/
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struct diskpart *
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diskpart_lookup_bsd_compat(struct diskpart *array, short slice, short part)
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{
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struct diskpart *s;
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/* S0 is either the whole disk (p=0) or mapped to annother partition */
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if (slice == 0) {
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/* s0, p0 => whole disk */
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if (part == 0)
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return &array[0];
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/* check compatability slice for mapping to BSD partition */
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if (array[0].type == DISKPART_DOS) {
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int i;
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for (i = 0; i < array[0].nsubs; i++) {
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s = &array[0].subs[i];
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if (s->type == DISKPART_BSD) {
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if (part > s->nsubs)
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return 0;
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return (&s->subs[part-1]);
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}
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}
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/* check for mapping to VTOC partition */
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for (i = 0; i < array[0].nsubs; i++) {
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s = &array[0].subs[i];
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if (s->type == DISKPART_VTOC) { /* VTOC/UNIX */
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if (part > s->nsubs)
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return 0;
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return (&s->subs[part-1]);
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}
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}
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}
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if (part > array[0].nsubs)
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return 0;
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return(&array[0].subs[part-1]);
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} else {
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/* slice != 0, find the DOS slice */
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if (array[0].type != DISKPART_DOS)
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return 0;
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if (slice > array[0].nsubs) {
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return 0;
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}
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s = &array[0].subs[slice-1];
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if (part == 0)
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return (s);
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if (part > s->nsubs)
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return 0;
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return (&s->subs[part-1]);
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}
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}
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