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From Tom, return 0xFF on invalid drives for int 21h/1c get drive allocation information (sectors/clusters)

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git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1376 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Kenneth J Davis 2009-05-10 12:36:57 +00:00
parent d9e2861a44
commit c6b55c1119
1 changed files with 19 additions and 15 deletions
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34
kernel/inthndlr.c
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@ -116,11 +116,11 @@ VOID ASMCFUNC int21_syscall(iregs FAR * irp)
irp->AL = 0xff; irp->AL = 0xff;
break; break;
/* set FreeDOS returned version for int 21.30 from BX */ /* set FreeDOS returned version for int 21.30 from BX */
case 0xfc: /* 0xfc ... 0xff are FreeDOS extensions */ case 0xfc: /* 0xfc ... 0xff are FreeDOS extensions */
os_setver_major = irp->BL; os_setver_major = irp->BL;
os_setver_minor = irp->BH; os_setver_minor = irp->BH;
break; break;
/* Toggle DOS-C rdwrblock trace dump */ /* Toggle DOS-C rdwrblock trace dump */
#ifdef DEBUG #ifdef DEBUG
@ -458,7 +458,7 @@ dispatch:
{ {
/* int 21h common error handler */ /* int 21h common error handler */
case 0x64: case 0x64:
goto error_invalid; goto error_invalid;
/* case 0x00: --> Simulate a DOS-4C-00 */ /* case 0x00: --> Simulate a DOS-4C-00 */
@ -651,9 +651,13 @@ dispatch:
{ {
BYTE FAR *p; BYTE FAR *p;
p = FatGetDrvData(lr.DL, &lr.AL, &lr.CX, &lr.DX); if ((p = FatGetDrvData(lr.DL, &lr.AL, &lr.CX, &lr.DX)) != NULL)
lr.DS = FP_SEG(p); {
lr.BX = FP_OFF(p); lr.DS = FP_SEG(p);
lr.BX = FP_OFF(p);
}
else
lr.AL = 0xff; /* return 0xff on invalid drive */
} }
break; break;
@ -1175,7 +1179,7 @@ dispatch:
break; break;
case 0x03: case 0x03:
if (uppermem_root != 0xffff) /* always error if not exists */ if (uppermem_root != 0xffff) /* always error if not exists */
{ {
DosUmbLink(lr.BX); DosUmbLink(lr.BX);
break; break;
@ -1291,7 +1295,7 @@ dispatch:
if (lr.DL < lastdrive) if (lr.DL < lastdrive)
{ {
struct cds FAR *cdsp = CDSp + lr.DL; struct cds FAR *cdsp = CDSp + lr.DL;
if (FP_OFF(cdsp->cdsDpb)) /* letter of physical drive? */ if (FP_OFF(cdsp->cdsDpb)) /* letter of physical drive? */
{ {
cdsp->cdsFlags &= ~CDSPHYSDRV; cdsp->cdsFlags &= ~CDSPHYSDRV;
if (lr.AL == 7) if (lr.AL == 7)
@ -1312,7 +1316,7 @@ dispatch:
CritErrCode = -rc; /* Maybe set */ CritErrCode = -rc; /* Maybe set */
SET_CARRY_FLAG(); SET_CARRY_FLAG();
} }
r->AX = -rc; /* okay because we use real_exit */ r->AX = -rc; /* okay because we use real_exit */
goto real_exit; goto real_exit;
} }
@ -1364,12 +1368,12 @@ dispatch:
lr.SI = FP_OFF(&nlsDBCSHardcoded); lr.SI = FP_OFF(&nlsDBCSHardcoded);
break; break;
case 1: /* set Korean Hangul input method to DL 0/1 */ case 1: /* set Korean Hangul input method to DL 0/1 */
lr.AL = 0xff; /* flag error (AL would be 0 if okay) */ lr.AL = 0xff; /* flag error (AL would be 0 if okay) */
break; break;
case 2: /* get Korean Hangul input method setting to DL */ case 2: /* get Korean Hangul input method setting to DL */
lr.AL = 0xff; /* flag error, do not set DL */ lr.AL = 0xff; /* flag error, do not set DL */
break; break;
default: /* is this the proper way to handle invalid AL? */ default: /* is this the proper way to handle invalid AL? */
rc = -1; rc = -1;
goto error_exit; goto error_exit;
} }