[aandrejevic] 67459: [NTVDM] Remove the useless wrappers BiosPeekCharacter and BiosGetCharacter. They're also a source of bugs since 0xFFFF could legitimately appear in the buffer.

Author: aandrejevic
Date: Mon Apr 27 14:14:14 2015
New Revision: 67459

URL: http://svn.reactos.org/svn/reactos?rev=67459&view=rev
Log:
[NTVDM]
Remove the useless wrappers BiosPeekCharacter and BiosGetCharacter. They're also
a source of bugs since 0xFFFF could legitimately appear in the buffer.

Modified:
    trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/kbdbios32.c

Modified: trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/kbdbios32.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/bios/...
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/kbdbios32.c	[iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/bios/bios32/kbdbios32.c	[iso-8859-1] Mon Apr 27 14:14:14 2015
@@ -80,26 +80,6 @@
     return TRUE;
 }

-static WORD BiosPeekCharacter(VOID)
-{
-    WORD CharacterData = 0;
-
-    /* Get the key from the queue, but don't remove it */
-    if (BiosKbdBufferTop(&CharacterData)) return CharacterData;
-    else return 0xFFFF;
-}
-
-static WORD BiosGetCharacter(VOID)
-{
-    WORD CharacterData = 0;
-
-    /* Check if there is a key available, and if so, remove it from the queue */
-    if (BiosKbdBufferTop(&CharacterData)) BiosKbdBufferPop();
-    else CharacterData = 0xFFFF;
-
-    return CharacterData;
-}
-
 static VOID WINAPI BiosKeyboardService(LPWORD Stack)
 {
     switch (getAH())
@@ -109,16 +89,17 @@
         /* Wait for extended keystroke and read */
         case 0x10:  // FIXME: Temporarily do the same as INT 16h, 00h
         {
+            WORD Character;
+
             /* Read the character (and wait if necessary) */
-            WORD Character = BiosGetCharacter();
-
-            if (Character == 0xFFFF)
+            if (!BiosKbdBufferTop(&Character))
             {
                 /* No key available. Set the handler CF to repeat the BOP */
                 setCF(1);
                 break;
             }

+            BiosKbdBufferPop();
             setAX(Character);

break;
@@ -129,9 +110,9 @@
         /* Get extended keystroke status */
         case 0x11:  // FIXME: Temporarily do the same as INT 16h, 01h
         {
-            WORD Character = BiosPeekCharacter();
-
-            if (Character != 0xFFFF)
+            WORD Character;
+            
+            if (BiosKbdBufferTop(&Character))
             {
                 /* There is a character, clear ZF and return it */
                 Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_ZF;