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Inline ioctl helper routine back again. We can save stack by using the

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dev variable that points to the device smartly.


git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1423 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2009-06-08 13:19:58 +00:00
parent 17bd0113b2
commit ab6b4ffdf4
1 changed files with 23 additions and 31 deletions
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52
kernel/ioctl.c
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@ -54,7 +54,7 @@ static BYTE *RcsId =
*/ */
STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev) int DosDevIOctl(lregs * r)
{ {
static UBYTE cmd [] = { static UBYTE cmd [] = {
0, 0, 0, 0,
@ -74,6 +74,7 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
/* 0x11 */ C_IOCTLQRY, /* 0x11 */ C_IOCTLQRY,
}; };
struct dhdr FAR *dev;
sft FAR *s; sft FAR *s;
struct dpb FAR *dpbp; struct dpb FAR *dpbp;
unsigned attr; unsigned attr;
@ -84,7 +85,7 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
/* commonly used, shouldn't harm to do front up */ /* commonly used, shouldn't harm to do front up */
CharReqHdr.r_command = cmd[r->AL]; CharReqHdr.r_command = cmd[r->AL];
if (al == 0x0C || al == 0x0D || al >= 0x10) /* generic or query */ if (r->AL == 0x0C || r->AL == 0x0D || r->AL >= 0x10) /* generic or query */
{ {
CharReqHdr.r_cat = r->CH; /* category (major) code */ CharReqHdr.r_cat = r->CH; /* category (major) code */
CharReqHdr.r_fun = r->CL; /* function (minor) code */ CharReqHdr.r_fun = r->CL; /* function (minor) code */
@ -105,7 +106,7 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
NetDelay = r->CX; NetDelay = r->CX;
if (r->DX) if (r->DX)
NetRetry = r->DX; NetRetry = r->DX;
break; return SUCCESS;
case 0x00: case 0x00:
case 0x01: case 0x01:
@ -124,8 +125,8 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
if ((s = get_sft(r->BX)) == (sft FAR *) - 1) if ((s = get_sft(r->BX)) == (sft FAR *) - 1)
return DE_INVLDHNDL; return DE_INVLDHNDL;
*dev = s->sft_dev; dev = s->sft_dev;
attr = s->sft_dev->dh_attr; attr = dev->dh_attr;
flags = s->sft_flags; flags = s->sft_flags;
switch (r->AL) switch (r->AL)
@ -138,7 +139,7 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
r->AX = flags; r->AX = flags;
/* Undocumented result, Ax = Dx seen using Pcwatch */ /* Undocumented result, Ax = Dx seen using Pcwatch */
r->DX = r->AX; r->DX = r->AX;
break; return SUCCESS;
case 0x01: case 0x01:
/* sft_flags is a file, return an error because you */ /* sft_flags is a file, return an error because you */
@ -156,18 +157,18 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
/* Set it to what we got in the DL register from the */ /* Set it to what we got in the DL register from the */
/* user. */ /* user. */
s->sft_flags_lo = SFT_FDEVICE | r->DL; s->sft_flags_lo = SFT_FDEVICE | r->DL;
break; return SUCCESS;
case 0x0a: case 0x0a:
r->DX = flags; r->DX = flags;
r->AX = 0; r->AX = 0;
break; return SUCCESS;
case 0x06: case 0x06:
if (!(flags & SFT_FDEVICE)) if (!(flags & SFT_FDEVICE))
{ {
r->AL = s->sft_posit >= s->sft_size ? 0 : 0xFF; r->AL = s->sft_posit >= s->sft_size ? 0 : 0xFF;
break; return SUCCESS;
} }
goto IoCharCommon; goto IoCharCommon;
@ -175,7 +176,7 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
if (!(flags & SFT_FDEVICE)) if (!(flags & SFT_FDEVICE))
{ {
r->AL = 0; r->AL = 0;
break; return SUCCESS;
} }
/* fall through */ /* fall through */
@ -188,7 +189,7 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
|| (r->AL == 0x0c && (attr & ATTR_GENIOCTL)))) || (r->AL == 0x0c && (attr & ATTR_GENIOCTL))))
{ {
CharReqHdr.r_unit = 0; CharReqHdr.r_unit = 0;
return 1; break;
} }
return DE_INVLDFUNC; return DE_INVLDFUNC;
} }
@ -216,11 +217,12 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
CharReqHdr.r_unit = (r->BL == 0 ? default_drive : r->BL - 1); CharReqHdr.r_unit = (r->BL == 0 ? default_drive : r->BL - 1);
#endif #endif
dev = NULL;
dpbp = get_dpb(CharReqHdr.r_unit); dpbp = get_dpb(CharReqHdr.r_unit);
if (dpbp) if (dpbp)
{ {
*dev = dpbp->dpb_device; dev = dpbp->dpb_device;
attr = dpbp->dpb_device->dh_attr; attr = dev->dh_attr;
CharReqHdr.r_unit = dpbp->dpb_subunit; CharReqHdr.r_unit = dpbp->dpb_subunit;
} }
else if (r->AL != 9) else if (r->AL != 9)
@ -232,13 +234,13 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
{ {
struct cds FAR *cdsp = get_cds(CharReqHdr.r_unit); struct cds FAR *cdsp = get_cds(CharReqHdr.r_unit);
r->AX = S_DONE | S_BUSY; r->AX = S_DONE | S_BUSY;
if (cdsp != NULL && dpbp == NULL) if (cdsp != NULL && dev == NULL)
{ {
r->DX = ATTR_REMOTE; r->DX = ATTR_REMOTE;
} }
else else
{ {
if (!dpbp) if (dev == NULL)
{ {
return DE_INVLDDRV; return DE_INVLDDRV;
} }
@ -248,7 +250,7 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
{ {
r->DX |= ATTR_SUBST; r->DX |= ATTR_SUBST;
} }
break; return SUCCESS;
} }
case 0x08: case 0x08:
if (!(attr & ATTR_EXCALLS)) if (!(attr & ATTR_EXCALLS))
@ -261,7 +263,8 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
if (r->AL == 0x0D && (r->CX & ~(0x486B-0x084A)) == 0x084A) if (r->AL == 0x0D && (r->CX & ~(0x486B-0x084A)) == 0x084A)
{ /* 084A/484A, 084B/484B, 086A/486A, 086B/486B */ { /* 084A/484A, 084B/484B, 086A/486A, 086B/486B */
r->AX = 0; /* (lock/unlock logical/physical volume) */ r->AX = 0; /* (lock/unlock logical/physical volume) */
break; /* simulate success for MS-DOS 7+ SCANDISK etc. --LG */ /* simulate success for MS-DOS 7+ SCANDISK etc. --LG */
return SUCCESS;
} }
if ((r->AL <= 0x05 && !(attr & ATTR_IOCTL)) if ((r->AL <= 0x05 && !(attr & ATTR_IOCTL))
|| (r->AL == 0x11 && !(attr & ATTR_QRYIOCTL)) || (r->AL == 0x11 && !(attr & ATTR_QRYIOCTL))
@ -269,26 +272,15 @@ STATIC int DosDevIOctl1(lregs * r, struct dhdr FAR **dev)
{ {
return DE_INVLDFUNC; return DE_INVLDFUNC;
} }
return 1; break;
default: /* 0x0e, 0x0f */ default: /* 0x0e, 0x0f */
if (attr & ATTR_GENIOCTL) if (attr & ATTR_GENIOCTL)
return 1; break;
return DE_INVLDFUNC; return DE_INVLDFUNC;
} }
break; break;
} }
return SUCCESS;
}
int DosDevIOctl(lregs * r)
{
int ret;
struct dhdr FAR *dev;
ret = DosDevIOctl1(r, &dev);
if(ret <= SUCCESS)
return ret;
/* call execrh() here instead of in DosDevIOctl1() to minimize stack usage */ /* call execrh() here instead of in DosDevIOctl1() to minimize stack usage */
execrh(&CharReqHdr, dev); execrh(&CharReqHdr, dev);