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Optimization: move the attribute checks down and localize some variables.

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git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1426 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2009-06-09 11:49:53 +00:00
parent 0231b7efd0
commit 598ca4276a
1 changed files with 26 additions and 36 deletions
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60
kernel/ioctl.c
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@ -75,12 +75,8 @@ int DosDevIOctl(lregs * r)
};
struct dhdr FAR *dev;
sft FAR *s;
struct dpb FAR *dpbp;
unsigned attr;
unsigned char al = r->AL;
if (al > 0x11)
if (r->AL > 0x11)
return DE_INVLDFUNC;
/* commonly used, shouldn't harm to do front up */
@ -118,6 +114,7 @@ int DosDevIOctl(lregs * r)
case 0x0c:
case 0x10:
{
sft FAR *s;
unsigned flags;
/* Test that the handle is valid and */
@ -173,20 +170,14 @@ int DosDevIOctl(lregs * r)
return SUCCESS;
}
dev = s->sft_dev;
attr = dev->dh_attr;
if ((r->AL <= 0x03 && (attr & ATTR_IOCTL))
|| r->AL == 0x06 || r->AL == 0x07
|| (r->AL == 0x10 && (attr & ATTR_QRYIOCTL))
|| (r->AL == 0x0c && (attr & ATTR_GENIOCTL)))
{
CharReqHdr.r_unit = 0;
break;
}
return DE_INVLDFUNC;
}
default: /* block IOCTL: 4, 5, 8, 9, d, e, f, 11 */
{
struct dpb FAR *dpbp;
unsigned attr;
/*
This line previously returned the deviceheader at r->bl. But,
DOS numbers its drives starting at 1, not 0. A=1, B=2, and so
@ -228,37 +219,36 @@ int DosDevIOctl(lregs * r)
r->DX = attr;
return SUCCESS;
}
case 0x08:
if (!(attr & ATTR_EXCALLS))
return DE_INVLDFUNC;
/* else fall through */
case 0x04:
case 0x05:
case 0x0d:
case 0x11:
if (r->AL == 0x0D && (r->CX & ~(0x486B-0x084A)) == 0x084A)
if ((r->CX & ~(0x486B-0x084A)) == 0x084A)
{ /* 084A/484A, 084B/484B, 086A/486A, 086B/486B */
r->AX = 0; /* (lock/unlock logical/physical volume) */
/* simulate success for MS-DOS 7+ SCANDISK etc. --LG */
return SUCCESS;
}
if ((r->AL <= 0x05 && !(attr & ATTR_IOCTL))
|| (r->AL == 0x11 && !(attr & ATTR_QRYIOCTL))
|| (r->AL == 0x0d && !(attr & ATTR_GENIOCTL)))
/* fall through */
default: /* 0x04, 0x05, 0x08, 0x0e, 0x0f, 0x11 */
break;
}
break;
}
}
{
unsigned testattr = ATTR_QRYIOCTL;
if (r->AL<=0x0f)
testattr = ATTR_GENIOCTL;
if (r->AL<=0x08)
testattr = ATTR_EXCALLS;
if (r->AL<=0x07)
testattr = 0xffff;
if (r->AL<=0x05)
testattr = ATTR_IOCTL;
if (!(dev->dh_attr & testattr))
return DE_INVLDFUNC;
}
break;
default: /* 0x0e, 0x0f */
if (attr & ATTR_GENIOCTL)
break;
return DE_INVLDFUNC;
}
break;
}
/* call execrh() here instead of in DosDevIOctl1() to minimize stack usage */
execrh(&CharReqHdr, dev);
if (CharReqHdr.r_status & S_ERROR)