[reactos] 03/03: [NTVDM] Log explicitly calls to Long FileName support functions in DOS INT 21h. Use MAXDWORD instead of hardcoded values.

[Hermès Bélusca-Maïto]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=addf1e87fe643c412dc22…

commit addf1e87fe643c412dc22f4fcb461410398e2f6b
Author:     Hermès Bélusca-Maïto <hermes.belusca-maito(a)reactos.org>
AuthorDate: Fri Dec 3 23:15:03 2021 +0100
Commit:     Hermès Bélusca-Maïto <hermes.belusca-maito(a)reactos.org>
CommitDate: Fri Dec 3 23:26:24 2021 +0100

    [NTVDM] Log explicitly calls to Long FileName support functions in DOS INT 21h. Use
MAXDWORD instead of hardcoded values.
---
 subsystems/mvdm/ntvdm/dos/dos32krnl/device.c |  2 +-
 subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c    | 15 +++++++++++++--
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/subsystems/mvdm/ntvdm/dos/dos32krnl/device.c
b/subsystems/mvdm/ntvdm/dos/dos32krnl/device.c
index 71fbdcef1aa..881f67e47d3 100644
--- a/subsystems/mvdm/ntvdm/dos/dos32krnl/device.c
+++ b/subsystems/mvdm/ntvdm/dos/dos32krnl/device.c
@@ -378,7 +378,7 @@ PDOS_DEVICE_NODE DosCreateDeviceEx(WORD Attributes, PCHAR DeviceName,
WORD Priva
 
     /* Fill the header with data */
     DriverHeader = SEG_OFF_TO_PTR(Segment, 0);
-    DriverHeader->Link = 0xFFFFFFFF;
+    DriverHeader->Link = MAXDWORD;
     DriverHeader->DeviceAttributes = Attributes;
     DriverHeader->StrategyRoutine = sizeof(DOS_DRIVER);
     DriverHeader->InterruptRoutine = sizeof(DOS_DRIVER) + sizeof(StrategyRoutine);
diff --git a/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
b/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
index 641ab62ed93..6c94ade7e6d 100644
--- a/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
+++ b/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
@@ -1998,6 +1998,17 @@ VOID WINAPI DosInt21h(LPWORD Stack)
             break;
         }
 
+        /* Long FileName Support */
+        case 0x71:
+        {
+            DPRINT1("INT 21h LFN Support, AH = %02Xh, AL = %02Xh NOT
IMPLEMENTED!\n",
+                    getAH(), getAL());
+
+            setAL(0); // Some functions expect AL to be 0 when it's not supported.
+            Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
+            break;
+        }
+
         /* Unsupported */
         default: // Default:
         {
@@ -2302,7 +2313,7 @@ BOOLEAN DosKRNLInitialize(VOID)
     SysVars->BootDrive = RtlUpcaseUnicodeChar(SharedUserData->NtSystemRoot[0]) -
'A' + 1;
 
     /* Initialize the NUL device driver */
-    SysVars->NullDevice.Link = 0xFFFFFFFF;
+    SysVars->NullDevice.Link = MAXDWORD;
     SysVars->NullDevice.DeviceAttributes = DOS_DEVATTR_NUL | DOS_DEVATTR_CHARACTER;
     // Offset from within the DOS data segment
     SysVars->NullDevice.StrategyRoutine  = DOS_DATA_OFFSET(NullDriverRoutine);
@@ -2380,7 +2391,7 @@ BOOLEAN DosKRNLInitialize(VOID)
 
     /* Initialize the SFT */
     Sft = (PDOS_SFT)FAR_POINTER(SysVars->FirstSft);
-    Sft->Link = 0xFFFFFFFF;
+    Sft->Link = MAXDWORD;
     Sft->NumDescriptors = DOS_SFT_SIZE;
 
     for (i = 0; i < Sft->NumDescriptors; i++)