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Merged int21/ax=7304, subfunctions 3 and 4, which work very similarly.

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git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1457 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2009-06-26 20:00:41 +00:00
parent 84fcfc5f11
commit e597bb20d4
2 changed files with 35 additions and 46 deletions
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17
hdr/xstructs.h
View File

@ -64,20 +64,19 @@ struct xdpbforformat {
} rebuilddpb;
struct {
DWORD newmirroring; /* new active FAT/mirroring state, or -1 to get
DWORD new; /* new active FAT/mirroring state, or -1 to get
bits 3-0: the 0-based FAT number of the active FAT
bits 6-4: reserved (0)
bit 7: do not mirror active FAT to inactive FATs
or:
set new root directory cluster, -1 - get current
*/
DWORD old; /* previous active FAT/mirroring state (as above)
or
get previous root directory cluster
*/
DWORD oldmirroring; /* previous active FAT/mirroring state (as above) */
UDWORD reserved[2];
} setmirroring;
struct {
DWORD newrootclst; /* set new root directory cluster, -1 - get current */
DWORD oldrootclst; /* get previous root directory cluster */
UDWORD reserved[2];
} setroot;
} setget;
} xdff_f;
};

64
kernel/inthndlr.c
View File

@ -293,53 +293,43 @@ int int21_fat32(lregs *r)
break;
}
case 0x03:
{
struct buffer FAR *bp;
bpb FAR *bpbp;
DWORD newmirroring =
xdffp->xdff_f.setmirroring.newmirroring;
if (newmirroring != -1
&& (ISFAT32(dpb)
&& (newmirroring & ~(0xf | 0x80))))
{
return DE_INVLDPARM;
}
xdffp->xdff_f.setmirroring.oldmirroring =
(ISFAT32(dpb) ? dpb->dpb_xflags : 0);
if (newmirroring != -1 && ISFAT32(dpb))
{
bp = getblock(1, dpb->dpb_unit);
bp->b_flag &= ~(BFR_DATA | BFR_DIR | BFR_FAT);
bp->b_flag |= BFR_VALID | BFR_DIRTY;
bpbp = (bpb FAR *) & bp->b_buffer[BT_BPB];
bpbp->bpb_xflags = (UWORD)newmirroring;
}
goto rebuild_dpb;
}
case 0x04:
{
struct buffer FAR *bp;
bpb FAR *bpbp;
DWORD rootclst = xdffp->xdff_f.setroot.newrootclst;
if (!ISFAT32(dpb)
|| (rootclst != -1
&& (rootclst == 1
|| (ULONG)rootclst > dpb->dpb_xsize)))
{
ULONG value;
if (!ISFAT32(dpb))
return DE_INVLDPARM;
}
xdffp->xdff_f.setroot.oldrootclst = dpb->dpb_xrootclst;
if (rootclst != -1)
value = xdffp->xdff_f.setget.new;
if ((UWORD) xdffp->xdff_function == 0x03)
{
bp = getblock(1, dpb->dpb_unit);
/* FAT mirroring */
if (value != 0xFFFFFFFF && (value & ~(0xf | 0x80)))
return DE_INVLDPARM;
xdffp->xdff_f.setget.old = dpb->dpb_xflags;
}
else
{
/* root cluster */
if (value != 0xFFFFFFFF && (value < 2 || value > dpb->dpb_xsize))
return DE_INVLDPARM;
xdffp->xdff_f.setget.old = dpb->dpb_xrootclst;
}
if (value != 0xFFFFFFFF)
{
bpb FAR *bpbp;
struct buffer FAR *bp = getblock(1, dpb->dpb_unit);
bp->b_flag &= ~(BFR_DATA | BFR_DIR | BFR_FAT);
bp->b_flag |= BFR_VALID | BFR_DIRTY;
bpbp = (bpb FAR *) & bp->b_buffer[BT_BPB];
bpbp->bpb_xrootclst = rootclst;
if ((UWORD) xdffp->xdff_function == 0x03)
bpbp->bpb_xflags = (UWORD)value;
else
bpbp->bpb_xrootclst = value;
}
goto rebuild_dpb;
}
default:
return DE_INVLDFUNC;
}
break;